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# (C) Copyright 2000 - 2012 |
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de. # # See file CREDITS for list of people who contributed to this # project. # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License as # published by the Free Software Foundation; either version 2 of # the License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, # MA 02111-1307 USA # Summary: ======== |
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This directory contains the source code for U-Boot, a boot loader for |
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Embedded boards based on PowerPC, ARM, MIPS and several other processors, which can be installed in a boot ROM and used to initialize and test the hardware or to download and run application code. |
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The development of U-Boot is closely related to Linux: some parts of |
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the source code originate in the Linux source tree, we have some header files in common, and special provision has been made to |
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support booting of Linux images. Some attention has been paid to make this software easily configurable and extendable. For instance, all monitor commands are implemented with the same call interface, so that it's very easy to add new commands. Also, instead of permanently adding rarely used code (for instance hardware test utilities) to the monitor, you can load and run it dynamically. Status: ======= In general, all boards for which a configuration option exists in the |
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Makefile have been tested to some extent and can be considered |
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"working". In fact, many of them are used in production systems. |
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In case of problems see the CHANGELOG and CREDITS files to find out |
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who contributed the specific port. The MAINTAINERS file lists board maintainers. |
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Note: There is no CHANGELOG file in the actual U-Boot source tree; it can be created dynamically from the Git log using: make CHANGELOG |
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Where to get help: ================== |
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In case you have questions about, problems with or contributions for U-Boot you should send a message to the U-Boot mailing list at |
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<u-boot@lists.denx.de>. There is also an archive of previous traffic on the mailing list - please search the archive before asking FAQ's. Please see http://lists.denx.de/pipermail/u-boot and http://dir.gmane.org/gmane.comp.boot-loaders.u-boot |
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Where to get source code: ========================= The U-Boot source code is maintained in the git repository at git://www.denx.de/git/u-boot.git ; you can browse it online at http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary The "snapshot" links on this page allow you to download tarballs of |
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any version you might be interested in. Official releases are also |
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available for FTP download from the ftp://ftp.denx.de/pub/u-boot/ directory. |
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Pre-built (and tested) images are available from |
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ftp://ftp.denx.de/pub/u-boot/images/ |
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Where we come from: =================== - start from 8xxrom sources |
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- create PPCBoot project (http://sourceforge.net/projects/ppcboot) |
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- clean up code - make it easier to add custom boards - make it possible to add other [PowerPC] CPUs - extend functions, especially: * Provide extended interface to Linux boot loader * S-Record download * network boot |
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* PCMCIA / CompactFlash / ATA disk / SCSI ... boot |
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- create ARMBoot project (http://sourceforge.net/projects/armboot) |
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- add other CPU families (starting with ARM) |
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- create U-Boot project (http://sourceforge.net/projects/u-boot) |
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- current project page: see http://www.denx.de/wiki/U-Boot |
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Names and Spelling: =================== The "official" name of this project is "Das U-Boot". The spelling "U-Boot" shall be used in all written text (documentation, comments in source files etc.). Example: This is the README file for the U-Boot project. File names etc. shall be based on the string "u-boot". Examples: include/asm-ppc/u-boot.h #include <asm/u-boot.h> Variable names, preprocessor constants etc. shall be either based on the string "u_boot" or on "U_BOOT". Example: U_BOOT_VERSION u_boot_logo IH_OS_U_BOOT u_boot_hush_start |
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Versioning: =========== |
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Starting with the release in October 2008, the names of the releases were changed from numerical release numbers without deeper meaning into a time stamp based numbering. Regular releases are identified by names consisting of the calendar year and month of the release date. Additional fields (if present) indicate release candidates or bug fix releases in "stable" maintenance trees. Examples: |
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U-Boot v2009.11 - Release November 2009 |
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U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release |
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Directory Hierarchy: ==================== |
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/arch Architecture specific files /arm Files generic to ARM architecture /cpu CPU specific files /arm720t Files specific to ARM 720 CPUs /arm920t Files specific to ARM 920 CPUs |
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/at91 Files specific to Atmel AT91RM9200 CPU |
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/imx Files specific to Freescale MC9328 i.MX CPUs /s3c24x0 Files specific to Samsung S3C24X0 CPUs |
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/arm925t Files specific to ARM 925 CPUs /arm926ejs Files specific to ARM 926 CPUs /arm1136 Files specific to ARM 1136 CPUs /ixp Files specific to Intel XScale IXP CPUs /pxa Files specific to Intel XScale PXA CPUs /s3c44b0 Files specific to Samsung S3C44B0 CPUs /sa1100 Files specific to Intel StrongARM SA1100 CPUs /lib Architecture specific library files /avr32 Files generic to AVR32 architecture /cpu CPU specific files /lib Architecture specific library files /blackfin Files generic to Analog Devices Blackfin architecture /cpu CPU specific files /lib Architecture specific library files |
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/x86 Files generic to x86 architecture |
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/cpu CPU specific files /lib Architecture specific library files /m68k Files generic to m68k architecture /cpu CPU specific files /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs /lib Architecture specific library files /microblaze Files generic to microblaze architecture /cpu CPU specific files /lib Architecture specific library files /mips Files generic to MIPS architecture /cpu CPU specific files |
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/mips32 Files specific to MIPS32 CPUs |
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/xburst Files specific to Ingenic XBurst CPUs |
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/lib Architecture specific library files |
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/nds32 Files generic to NDS32 architecture /cpu CPU specific files /n1213 Files specific to Andes Technology N1213 CPUs /lib Architecture specific library files |
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/nios2 Files generic to Altera NIOS2 architecture /cpu CPU specific files /lib Architecture specific library files |
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/powerpc Files generic to PowerPC architecture |
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/cpu CPU specific files /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs /mpc5xx Files specific to Freescale MPC5xx CPUs /mpc5xxx Files specific to Freescale MPC5xxx CPUs /mpc8xx Files specific to Freescale MPC8xx CPUs /mpc8220 Files specific to Freescale MPC8220 CPUs /mpc824x Files specific to Freescale MPC824x CPUs /mpc8260 Files specific to Freescale MPC8260 CPUs /mpc85xx Files specific to Freescale MPC85xx CPUs /ppc4xx Files specific to AMCC PowerPC 4xx CPUs /lib Architecture specific library files /sh Files generic to SH architecture /cpu CPU specific files /sh2 Files specific to sh2 CPUs /sh3 Files specific to sh3 CPUs /sh4 Files specific to sh4 CPUs /lib Architecture specific library files /sparc Files generic to SPARC architecture /cpu CPU specific files /leon2 Files specific to Gaisler LEON2 SPARC CPU /leon3 Files specific to Gaisler LEON3 SPARC CPU /lib Architecture specific library files /api Machine/arch independent API for external apps /board Board dependent files /common Misc architecture independent functions /disk Code for disk drive partition handling /doc Documentation (don't expect too much) /drivers Commonly used device drivers /examples Example code for standalone applications, etc. /fs Filesystem code (cramfs, ext2, jffs2, etc.) /include Header Files /lib Files generic to all architectures /libfdt Library files to support flattened device trees /lzma Library files to support LZMA decompression /lzo Library files to support LZO decompression /net Networking code /post Power On Self Test /rtc Real Time Clock drivers /tools Tools to build S-Record or U-Boot images, etc. |
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Software Configuration: ======================= Configuration is usually done using C preprocessor defines; the rationale behind that is to avoid dead code whenever possible. There are two classes of configuration variables: * Configuration _OPTIONS_: These are selectable by the user and have names beginning with "CONFIG_". * Configuration _SETTINGS_: These depend on the hardware etc. and should not be meddled with if you don't know what you're doing; they have names beginning with |
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"CONFIG_SYS_". |
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Later we will add a configuration tool - probably similar to or even identical to what's used for the Linux kernel. Right now, we have to do the configuration by hand, which means creating some symbolic links and editing some configuration files. We use the TQM8xxL boards as an example here. Selection of Processor Architecture and Board Type: --------------------------------------------------- For all supported boards there are ready-to-use default configurations available; just type "make <board_name>_config". Example: For a TQM823L module type: cd u-boot make TQM823L_config |
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For the Cogent platform, you need to specify the CPU type as well; |
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e.g. "make cogent_mpc8xx_config". And also configure the cogent directory according to the instructions in cogent/README. Configuration Options: ---------------------- Configuration depends on the combination of board and CPU type; all such information is kept in a configuration file "include/configs/<board_name>.h". Example: For a TQM823L module, all configuration settings are in "include/configs/TQM823L.h". |
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Many of the options are named exactly as the corresponding Linux kernel configuration options. The intention is to make it easier to build a config tool - later. |
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The following options need to be configured: |
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- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. |
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- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) |
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Define exactly one, e.g. CONFIG_ATSTK1002 |
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- CPU Module Type: (if CONFIG_COGENT is defined) Define exactly one of CONFIG_CMA286_60_OLD --- FIXME --- not tested yet: CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, CONFIG_CMA287_23, CONFIG_CMA287_50 - Motherboard Type: (if CONFIG_COGENT is defined) Define exactly one of CONFIG_CMA101, CONFIG_CMA102 - Motherboard I/O Modules: (if CONFIG_COGENT is defined) Define one or more of CONFIG_CMA302 - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) Define one or more of CONFIG_LCD_HEARTBEAT - update a character position on |
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the LCD display every second with |
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a "rotator" |\-/|\-/ |
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- Board flavour: (if CONFIG_MPC8260ADS is defined) CONFIG_ADSTYPE Possible values are: |
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CONFIG_SYS_8260ADS - original MPC8260ADS CONFIG_SYS_8266ADS - MPC8266ADS CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR CONFIG_SYS_8272ADS - MPC8272ADS |
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- Marvell Family Member CONFIG_SYS_MVFS - define it if you want to enable multiple fs option at one time for marvell soc family |
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- MPC824X Family Member (if CONFIG_MPC824X is defined) |
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Define exactly one of CONFIG_MPC8240, CONFIG_MPC8245 |
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- 8xx CPU Options: (if using an MPC8xx CPU) |
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CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if get_gclk_freq() cannot work |
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e.g. if there is no 32KHz reference PIT/RTC clock |
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CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK or XTAL/EXTAL) |
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- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): |
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CONFIG_SYS_8xx_CPUCLK_MIN CONFIG_SYS_8xx_CPUCLK_MAX |
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CONFIG_8xx_CPUCLK_DEFAULT |
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See doc/README.MPC866 |
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CONFIG_SYS_MEASURE_CPUCLK |
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Define this to measure the actual CPU clock instead of relying on the correctness of the configured values. Mostly useful for board bringup to make sure the PLL is locked at the intended frequency. Note that this requires a (stable) reference clock (32 kHz |
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RTC clock or CONFIG_SYS_8XX_XIN) |
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CONFIG_SYS_DELAYED_ICACHE Define this option if you want to enable the ICache only when Code runs from RAM. |
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- 85xx CPU Options: |
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CONFIG_SYS_PPC64 Specifies that the core is a 64-bit PowerPC implementation (implements the "64" category of the Power ISA). This is necessary for ePAPR compliance, among other possible reasons. |
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CONFIG_SYS_FSL_TBCLK_DIV Defines the core time base clock divider ratio compared to the system clock. On most PQ3 devices this is 8, on newer QorIQ devices it can be 16 or 32. The ratio varies from SoC to Soc. |
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CONFIG_SYS_FSL_PCIE_COMPAT Defines the string to utilize when trying to match PCIe device tree nodes for the given platform. |
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CONFIG_SYS_PPC_E500_DEBUG_TLB Enables a temporary TLB entry to be used during boot to work around limitations in e500v1 and e500v2 external debugger support. This reduces the portions of the boot code where breakpoints and single stepping do not work. The value of this symbol should be set to the TLB1 entry to be used for this purpose. |
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CONFIG_SYS_FSL_ERRATUM_A004510 Enables a workaround for erratum A004510. If set, then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set. CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional) Defines one or two SoC revisions (low 8 bits of SVR) for which the A004510 workaround should be applied. The rest of SVR is either not relevant to the decision of whether the erratum is present (e.g. p2040 versus p2041) or is implied by the build target, which controls whether CONFIG_SYS_FSL_ERRATUM_A004510 is set. See Freescale App Note 4493 for more information about this erratum. CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY This is the value to write into CCSR offset 0x18600 according to the A004510 workaround. |
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- Generic CPU options: CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN Defines the endianess of the CPU. Implementation of those values is arch specific. |
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- Intel Monahans options: |
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CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO |
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Defines the Monahans run mode to oscillator ratio. Valid values are 8, 16, 24, 31. The core frequency is this value multiplied by 13 MHz. |
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CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO |
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Defines the Monahans turbo mode to oscillator ratio. Valid values are 1 (default if undefined) and |
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2. The core frequency as calculated above is multiplied |
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by this value. |
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- MIPS CPU options: CONFIG_SYS_INIT_SP_OFFSET Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack pointer. This is needed for the temporary stack before relocation. CONFIG_SYS_MIPS_CACHE_MODE Cache operation mode for the MIPS CPU. See also arch/mips/include/asm/mipsregs.h. Possible values are: CONF_CM_CACHABLE_NO_WA CONF_CM_CACHABLE_WA CONF_CM_UNCACHED CONF_CM_CACHABLE_NONCOHERENT CONF_CM_CACHABLE_CE CONF_CM_CACHABLE_COW CONF_CM_CACHABLE_CUW CONF_CM_CACHABLE_ACCELERATED CONFIG_SYS_XWAY_EBU_BOOTCFG Special option for Lantiq XWAY SoCs for booting from NOR flash. See also arch/mips/cpu/mips32/start.S. CONFIG_XWAY_SWAP_BYTES Enable compilation of tools/xway-swap-bytes needed for Lantiq XWAY SoCs for booting from NOR flash. The U-Boot image needs to be swapped if a flash programmer is used. |
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- ARM options: CONFIG_SYS_EXCEPTION_VECTORS_HIGH Select high exception vectors of the ARM core, e.g., do not clear the V bit of the c1 register of CP15. |
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CONFIG_SYS_THUMB_BUILD Use this flag to build U-Boot using the Thumb instruction set for ARM architectures. Thumb instruction set provides better code density. For ARM architectures that support Thumb2 this flag will result in Thumb2 code generated by GCC. |
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- Linux Kernel Interface: |
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CONFIG_CLOCKS_IN_MHZ U-Boot stores all clock information in Hz internally. For binary compatibility with older Linux kernels (which expect the clocks passed in the bd_info data to be in MHz) the environment variable "clocks_in_mhz" can be defined so that U-Boot converts clock data to MHZ before passing it to the Linux kernel. |
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When CONFIG_CLOCKS_IN_MHZ is defined, a definition of |
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"clocks_in_mhz=1" is automatically included in the |
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default environment. |
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CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] |
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When transferring memsize parameter to linux, some versions |
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expect it to be in bytes, others in MB. Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. |
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CONFIG_OF_LIBFDT |
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passed using flattened device trees (based on open firmware concepts). CONFIG_OF_LIBFDT * New libfdt-based support * Adds the "fdt" command |
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* The bootm command automatically updates the fdt |
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OF_CPU - The proper name of the cpus node (only required for MPC512X and MPC5xxx based boards). OF_SOC - The proper name of the soc node (only required for MPC512X and MPC5xxx based boards). |
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OF_TBCLK - The timebase frequency. |
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OF_STDOUT_PATH - The path to the console device |
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boards with QUICC Engines require OF_QE to set UCC MAC addresses |
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CONFIG_OF_BOARD_SETUP Board code has addition modification that it wants to make to the flat device tree before handing it off to the kernel |
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CONFIG_OF_BOOT_CPU |
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This define fills in the correct boot CPU in the boot |
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param header, the default value is zero if undefined. |
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CONFIG_OF_IDE_FIXUP U-Boot can detect if an IDE device is present or not. If not, and this new config option is activated, U-Boot removes the ATA node from the DTS before booting Linux, so the Linux IDE driver does not probe the device and crash. This is needed for buggy hardware (uc101) where no pull down resistor is connected to the signal IDE5V_DD7. |
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CONFIG_MACH_TYPE [relevant for ARM only][mandatory] This setting is mandatory for all boards that have only one machine type and must be used to specify the machine type number as it appears in the ARM machine registry (see http://www.arm.linux.org.uk/developer/machines/). Only boards that have multiple machine types supported in a single configuration file and the machine type is runtime discoverable, do not have to use this setting. |
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- vxWorks boot parameters: bootvx constructs a valid bootline using the following environments variables: bootfile, ipaddr, serverip, hostname. It loads the vxWorks image pointed bootfile. CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters CONFIG_SYS_VXWORKS_ADD_PARAMS Add it at the end of the bootline. E.g "u=username pw=secret" Note: If a "bootargs" environment is defined, it will overwride the defaults discussed just above. |
2c451f783 armv7: cache main... |
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- Cache Configuration: CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot |
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- Cache Configuration for ARM: CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache controller CONFIG_SYS_PL310_BASE - Physical base address of PL310 controller register space |
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- Serial Ports: |
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CONFIG_PL010_SERIAL |
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Define this if you want support for Amba PrimeCell PL010 UARTs. |
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CONFIG_PL011_SERIAL |
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Define this if you want support for Amba PrimeCell PL011 UARTs. CONFIG_PL011_CLOCK If you have Amba PrimeCell PL011 UARTs, set this variable to the clock speed of the UARTs. CONFIG_PL01x_PORTS If you have Amba PrimeCell PL010 or PL011 UARTs on your board, define this to a list of base addresses for each (supported) port. See e.g. include/configs/versatile.h |
910f1ae3e Serial: p1011: ne... |
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CONFIG_PL011_SERIAL_RLCR Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500) have separate receive and transmit line control registers. Set this variable to initialize the extra register. CONFIG_PL011_SERIAL_FLUSH_ON_INIT On some platforms (e.g. U8500) U-Boot is loaded by a second stage boot loader that has already initialized the UART. Define this variable to flush the UART at init time. |
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|
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- Console Interface: |
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Depending on board, define exactly one serial port (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, CONFIG_8xx_CONS_SCC1, ...), or switch off the serial console by defining CONFIG_8xx_CONS_NONE |
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Note: if CONFIG_8xx_CONS_NONE is defined, the serial port routines must be defined elsewhere (i.e. serial_init(), serial_getc(), ...) CONFIG_CFB_CONSOLE Enables console device for a color framebuffer. Needs following |
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defines (cf. smiLynxEM, i8042) |
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VIDEO_FB_LITTLE_ENDIAN graphic memory organisation (default big endian) VIDEO_HW_RECTFILL graphic chip supports rectangle fill (cf. smiLynxEM) VIDEO_HW_BITBLT graphic chip supports bit-blit (cf. smiLynxEM) VIDEO_VISIBLE_COLS visible pixel columns (cols=pitch) |
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VIDEO_VISIBLE_ROWS visible pixel rows VIDEO_PIXEL_SIZE bytes per pixel |
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VIDEO_DATA_FORMAT graphic data format (0-5, cf. cfb_console.c) |
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VIDEO_FB_ADRS framebuffer address |
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VIDEO_KBD_INIT_FCT keyboard int fct (i.e. i8042_kbd_init()) VIDEO_TSTC_FCT test char fct (i.e. i8042_tstc) VIDEO_GETC_FCT get char fct (i.e. i8042_getc) CONFIG_CONSOLE_CURSOR cursor drawing on/off (requires blink timer cf. i8042.c) |
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CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) |
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CONFIG_CONSOLE_TIME display time/date info in upper right corner |
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(requires CONFIG_CMD_DATE) |
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CONFIG_VIDEO_LOGO display Linux logo in upper left corner |
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CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of linux_logo.h for logo. Requires CONFIG_VIDEO_LOGO |
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CONFIG_CONSOLE_EXTRA_INFO |
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additional board info beside |
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the logo |
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When CONFIG_CFB_CONSOLE_ANSI is defined, console will support a limited number of ANSI escape sequences (cursor control, erase functions and limited graphics rendition control). |
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When CONFIG_CFB_CONSOLE is defined, video console is default i/o. Serial console can be forced with environment 'console=serial'. |
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|
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When CONFIG_SILENT_CONSOLE is defined, all console messages (by U-Boot and Linux!) can be silenced with the "silent" environment variable. See doc/README.silent for more information. |
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|
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- Console Baudrate: CONFIG_BAUDRATE - in bps Select one of the baudrates listed in |
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CONFIG_SYS_BAUDRATE_TABLE, see below. CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale |
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|
c92fac91a 82xx serial, smc:... |
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- Console Rx buffer length With CONFIG_SYS_SMC_RXBUFLEN it is possible to define the maximum receive buffer length for the SMC. |
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This option is actual only for 82xx and 8xx possible. |
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If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE must be defined, to setup the maximum idle timeout for the SMC. |
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- Pre-Console Buffer: |
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Prior to the console being initialised (i.e. serial UART initialised etc) all console output is silently discarded. Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to buffer any console messages prior to the console being initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ |
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bytes are output before the console is initialised, the |
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earlier bytes are discarded. 'Sane' compilers will generate smaller code if CONFIG_PRE_CON_BUF_SZ is a power of 2 |
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|
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- Safe printf() functions Define CONFIG_SYS_VSNPRINTF to compile in safe versions of the printf() functions. These are defined in include/vsprintf.h and include snprintf(), vsnprintf() and so on. Code size increase is approximately 300-500 bytes. If this option is not given then these functions will silently discard their buffer size argument - this means you are not getting any overflow checking in this case. |
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- Boot Delay: CONFIG_BOOTDELAY - in seconds Delay before automatically booting the default image; set to -1 to disable autoboot. |
93d7212fa Allow runtime con... |
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set to -2 to autoboot with no delay and not check for abort (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined). |
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See doc/README.autoboot for these options that work with CONFIG_BOOTDELAY. None are required. CONFIG_BOOT_RETRY_TIME CONFIG_BOOT_RETRY_MIN CONFIG_AUTOBOOT_KEYED CONFIG_AUTOBOOT_PROMPT CONFIG_AUTOBOOT_DELAY_STR CONFIG_AUTOBOOT_STOP_STR CONFIG_AUTOBOOT_DELAY_STR2 CONFIG_AUTOBOOT_STOP_STR2 CONFIG_ZERO_BOOTDELAY_CHECK CONFIG_RESET_TO_RETRY - Autoboot Command: CONFIG_BOOTCOMMAND Only needed when CONFIG_BOOTDELAY is enabled; define a command string that is automatically executed when no character is read on the console interface within "Boot Delay" after reset. CONFIG_BOOTARGS |
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This can be used to pass arguments to the bootm command. The value of CONFIG_BOOTARGS goes into the environment value "bootargs". |
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CONFIG_RAMBOOT and CONFIG_NFSBOOT |
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The value of these goes into the environment as "ramboot" and "nfsboot" respectively, and can be used as a convenience, when switching between booting from |
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RAM and NFS. |
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- Pre-Boot Commands: CONFIG_PREBOOT When this option is #defined, the existence of the environment variable "preboot" will be checked immediately before starting the CONFIG_BOOTDELAY countdown and/or running the auto-boot command resp. entering interactive mode. This feature is especially useful when "preboot" is automatically generated or modified. For an example see the LWMON board specific code: here "preboot" is modified when the user holds down a certain combination of keys on the (special) keyboard when booting the systems - Serial Download Echo Mode: CONFIG_LOADS_ECHO If defined to 1, all characters received during a serial download (using the "loads" command) are echoed back. This might be needed by some terminal emulations (like "cu"), but may as well just take time on others. This setting #define's the initial value of the "loads_echo" environment variable. |
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- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) |
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CONFIG_KGDB_BAUDRATE Select one of the baudrates listed in |
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CONFIG_SYS_BAUDRATE_TABLE, see below. |
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- Monitor Functions: |
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Monitor commands can be included or excluded from the build by using the #include files |
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<config_cmd_all.h> and #undef'ing unwanted commands, or using <config_cmd_default.h> |
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and augmenting with additional #define's for wanted commands. The default command configuration includes all commands except those marked below with a "*". CONFIG_CMD_ASKENV * ask for env variable |
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CONFIG_CMD_BDI bdinfo CONFIG_CMD_BEDBUG * Include BedBug Debugger CONFIG_CMD_BMP * BMP support CONFIG_CMD_BSP * Board specific commands CONFIG_CMD_BOOTD bootd CONFIG_CMD_CACHE * icache, dcache CONFIG_CMD_CONSOLE coninfo |
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CONFIG_CMD_CRC32 * crc32 |
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CONFIG_CMD_DATE * support for RTC, date/time... CONFIG_CMD_DHCP * DHCP support CONFIG_CMD_DIAG * Diagnostics |
a7c931045 Add support for M... |
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CONFIG_CMD_DS4510 * ds4510 I2C gpio commands CONFIG_CMD_DS4510_INFO * ds4510 I2C info command CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd CONFIG_CMD_DS4510_RST * ds4510 I2C rst command |
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CONFIG_CMD_DTT * Digital Therm and Thermostat CONFIG_CMD_ECHO echo arguments |
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CONFIG_CMD_EDITENV edit env variable |
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CONFIG_CMD_EEPROM * EEPROM read/write support CONFIG_CMD_ELF * bootelf, bootvx |
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CONFIG_CMD_ENV_CALLBACK * display details about env callbacks |
0c79cda01 env: make import/... |
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CONFIG_CMD_EXPORTENV * export the environment |
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CONFIG_CMD_EXT2 * ext2 command support CONFIG_CMD_EXT4 * ext4 command support |
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CONFIG_CMD_SAVEENV saveenv |
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CONFIG_CMD_FDC * Floppy Disk Support |
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CONFIG_CMD_FAT * FAT command support |
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CONFIG_CMD_FDOS * Dos diskette Support CONFIG_CMD_FLASH flinfo, erase, protect CONFIG_CMD_FPGA FPGA device initialization support |
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CONFIG_CMD_GETTIME * Get time since boot |
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CONFIG_CMD_GO * the 'go' command (exec code) |
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CONFIG_CMD_GREPENV * search environment |
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CONFIG_CMD_HASH * calculate hash / digest |
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CONFIG_CMD_HWFLOW * RTS/CTS hw flow control CONFIG_CMD_I2C * I2C serial bus support CONFIG_CMD_IDE * IDE harddisk support CONFIG_CMD_IMI iminfo CONFIG_CMD_IMLS List all found images CONFIG_CMD_IMMAP * IMMR dump support |
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CONFIG_CMD_IMPORTENV * import an environment |
c167cc020 Add a new "ini" c... |
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CONFIG_CMD_INI * import data from an ini file into the env |
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CONFIG_CMD_IRQ * irqinfo CONFIG_CMD_ITEST Integer/string test of 2 values CONFIG_CMD_JFFS2 * JFFS2 Support CONFIG_CMD_KGDB * kgdb |
1ba7fd256 Blackfin: ldrinfo... |
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CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader) |
d22c338e0 net: Add link-loc... |
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CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration (169.254.*.*) |
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CONFIG_CMD_LOADB loadb CONFIG_CMD_LOADS loads |
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CONFIG_CMD_MD5SUM print md5 message digest (requires CONFIG_CMD_MEMORY and CONFIG_MD5) |
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CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, loop, loopw, mtest CONFIG_CMD_MISC Misc functions like sleep etc CONFIG_CMD_MMC * MMC memory mapped support CONFIG_CMD_MII * MII utility commands |
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CONFIG_CMD_MTDPARTS * MTD partition support |
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CONFIG_CMD_NAND * NAND support CONFIG_CMD_NET bootp, tftpboot, rarpboot |
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CONFIG_CMD_PCA953X * PCA953x I2C gpio commands |
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CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command |
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CONFIG_CMD_PCI * pciinfo CONFIG_CMD_PCMCIA * PCMCIA support CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network host CONFIG_CMD_PORTIO * Port I/O |
ff048ea91 Add a command to ... |
816 |
CONFIG_CMD_READ * Read raw data from partition |
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CONFIG_CMD_REGINFO * Register dump CONFIG_CMD_RUN run command in env variable CONFIG_CMD_SAVES * save S record dump CONFIG_CMD_SCSI * SCSI Support CONFIG_CMD_SDRAM * print SDRAM configuration information (requires CONFIG_CMD_I2C) CONFIG_CMD_SETGETDCR Support for DCR Register access (4xx only) |
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CONFIG_CMD_SF * Read/write/erase SPI NOR flash |
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CONFIG_CMD_SHA1SUM print sha1 memory digest |
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(requires CONFIG_CMD_MEMORY) |
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CONFIG_CMD_SOURCE "source" command Support |
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CONFIG_CMD_SPI * SPI serial bus support |
7a83af07a TFTP: add tftpsrv... |
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CONFIG_CMD_TFTPSRV * TFTP transfer in server mode |
1fb7cd498 net: tftpput: imp... |
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CONFIG_CMD_TFTPPUT * TFTP put command (upload) |
da83bcd7b Add a command to ... |
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CONFIG_CMD_TIME * run command and report execution time (ARM specific) CONFIG_CMD_TIMER * access to the system tick timer |
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CONFIG_CMD_USB * USB support |
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CONFIG_CMD_CDP * Cisco Discover Protocol support |
c8339f515 CMD: Fix typo CMD... |
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CONFIG_CMD_MFSL * Microblaze FSL support |
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|
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EXAMPLE: If you want all functions except of network support you can write: |
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#include "config_cmd_all.h" #undef CONFIG_CMD_NET |
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|
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Other Commands: fdt (flattened device tree) command: CONFIG_OF_LIBFDT |
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Note: Don't enable the "icache" and "dcache" commands |
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(configuration option CONFIG_CMD_CACHE) unless you know |
43d9616cf * Patch by Robert... |
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what you (and your U-Boot users) are doing. Data cache cannot be enabled on systems like the 8xx or 8260 (where accesses to the IMMR region must be uncached), and it cannot be disabled on all other systems where we (mis-) use the data cache to hold an initial stack and some data. |
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XXX - this list needs to get updated! |
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- Device tree: CONFIG_OF_CONTROL If this variable is defined, U-Boot will use a device tree to configure its devices, instead of relying on statically compiled #defines in the board file. This option is experimental and only available on a few boards. The device tree is available in the global data as gd->fdt_blob. |
2c0f79e44 fdt: Add support ... |
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U-Boot needs to get its device tree from somewhere. This can be done using one of the two options below: |
bbb0b128c fdt: Add support ... |
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CONFIG_OF_EMBED If this variable is defined, U-Boot will embed a device tree binary in its image. This device tree file should be in the board directory and called <soc>-<board>.dts. The binary file is then picked up in board_init_f() and made available through the global data structure as gd->blob. |
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|
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CONFIG_OF_SEPARATE If this variable is defined, U-Boot will build a device tree binary. It will be called u-boot.dtb. Architecture-specific code will locate it at run-time. Generally this works by: cat u-boot.bin u-boot.dtb >image.bin and in fact, U-Boot does this for you, creating a file called u-boot-dtb.bin which is useful in the common case. You can still use the individual files if you need something more exotic. |
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- Watchdog: CONFIG_WATCHDOG If this variable is defined, it enables watchdog |
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support for the SoC. There must be support in the SoC specific code for a watchdog. For the 8xx and 8260 CPUs, the SIU Watchdog feature is enabled in the SYPCR register. When supported for a specific SoC is available, then no further board specific code should be needed to use it. CONFIG_HW_WATCHDOG When using a watchdog circuitry external to the used SoC, then define this variable and provide board specific code for the "hw_watchdog_reset" function. |
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|
c1551ea81 U-Boot version en... |
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- U-Boot Version: CONFIG_VERSION_VARIABLE If this variable is defined, an environment variable named "ver" is created by U-Boot showing the U-Boot version as printed by the "version" command. |
a1ea8e510 README: Update ve... |
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Any change to this variable will be reverted at the next reset. |
c1551ea81 U-Boot version en... |
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|
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- Real-Time Clock: |
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When CONFIG_CMD_DATE is selected, the type of the RTC |
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has to be selected, too. Define exactly one of the following options: CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC |
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CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC |
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917 |
CONFIG_RTC_MC146818 - use MC146818 RTC |
1cb8e980c * Patches by Davi... |
918 |
CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC |
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919 |
CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC |
7f70e8530 * Patch by David ... |
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CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC |
3bac35137 * Patch by Josef ... |
921 |
CONFIG_RTC_DS164x - use Dallas DS164x RTC |
9536dfcce Add support for I... |
922 |
CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC |
4c0d4c3b7 * Patch by Tom Ar... |
923 |
CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC |
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CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 |
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CONFIG_SYS_RV3029_TCR - enable trickle charger on RV3029 RTC. |
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|
b37c7e5e5 * Patch by Seb Ja... |
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Note that if the RTC uses I2C, then the I2C interface must also be configured. See I2C Support, below. |
e92739d34 Add support for P... |
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- GPIO Support: CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO CONFIG_PCA953X_INFO - enable pca953x info command |
5dec49ca2 pca953x: support ... |
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The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of chip-ngpio pairs that tell the PCA953X driver the number of pins supported by a particular chip. |
e92739d34 Add support for P... |
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Note that if the GPIO device uses I2C, then the I2C interface must also be configured. See I2C Support, below. |
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- Timestamp Support: |
43d9616cf * Patch by Robert... |
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When CONFIG_TIMESTAMP is selected, the timestamp (date and time) of an image is printed by image commands like bootm or iminfo. This option is |
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942 |
automatically enabled when you select CONFIG_CMD_DATE . |
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|
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- Partition Labels (disklabels) Supported: Zero or more of the following: CONFIG_MAC_PARTITION Apple's MacOS partition table. CONFIG_DOS_PARTITION MS Dos partition table, traditional on the Intel architecture, USB sticks, etc. CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc. CONFIG_EFI_PARTITION GPT partition table, common when EFI is the bootloader. Note 2TB partition limit; see disk/part_efi.c CONFIG_MTD_PARTITIONS Memory Technology Device partition table. |
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|
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If IDE or SCSI support is enabled (CONFIG_CMD_IDE or CONFIG_CMD_SCSI) you must configure support for at |
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957 |
least one non-MTD partition type as well. |
c609719b8 Initial revision |
958 959 |
- IDE Reset method: |
4d13cbad1 * Patch by Toluna... |
960 961 |
CONFIG_IDE_RESET_ROUTINE - this is defined in several board configurations files but used nowhere! |
c609719b8 Initial revision |
962 |
|
4d13cbad1 * Patch by Toluna... |
963 964 965 966 |
CONFIG_IDE_RESET - is this is defined, IDE Reset will be performed by calling the function ide_set_reset(int reset) which has to be defined in a board specific file |
c609719b8 Initial revision |
967 968 969 970 971 |
- ATAPI Support: CONFIG_ATAPI Set this to enable ATAPI support. |
c40b29568 * Patch by Rune T... |
972 973 974 975 |
- LBA48 Support CONFIG_LBA48 Set this to enable support for disks larger than 137GB |
4b142febf common: delete CO... |
976 |
Also look at CONFIG_SYS_64BIT_LBA. |
c40b29568 * Patch by Rune T... |
977 978 |
Whithout these , LBA48 support uses 32bit variables and will 'only' support disks up to 2.1TB. |
6d0f6bcf3 rename CFG_ macro... |
979 |
CONFIG_SYS_64BIT_LBA: |
c40b29568 * Patch by Rune T... |
980 981 |
When enabled, makes the IDE subsystem use 64bit sector addresses. Default is 32bit. |
c609719b8 Initial revision |
982 983 984 985 |
- SCSI Support: At the moment only there is only support for the SYM53C8XX SCSI controller; define CONFIG_SCSI_SYM53C8XX to enable it. |
6d0f6bcf3 rename CFG_ macro... |
986 987 988 |
CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the |
c609719b8 Initial revision |
989 990 |
maximum numbers of LUNs, SCSI ID's and target devices. |
6d0f6bcf3 rename CFG_ macro... |
991 |
CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) |
c609719b8 Initial revision |
992 |
|
447c031ba scsi: Add functio... |
993 994 |
The environment variable 'scsidevs' is set to the number of SCSI devices found during the last scan. |
c609719b8 Initial revision |
995 |
- NETWORK Support (PCI): |
682011ff6 * Patches by Udi ... |
996 |
CONFIG_E1000 |
ce5207e19 e1000: Allow dire... |
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 |
Support for Intel 8254x/8257x gigabit chips. CONFIG_E1000_SPI Utility code for direct access to the SPI bus on Intel 8257x. This does not do anything useful unless you set at least one of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC. CONFIG_E1000_SPI_GENERIC Allow generic access to the SPI bus on the Intel 8257x, for example with the "sspi" command. CONFIG_CMD_E1000 Management command for E1000 devices. When used on devices with SPI support you can reprogram the EEPROM from U-Boot. |
53cf9435c - CFG_RX_ETH_BUFF... |
1011 |
|
ac3315c26 new PHY @ e1000 -... |
1012 |
CONFIG_E1000_FALLBACK_MAC |
11ccc33fa Many spelling fix... |
1013 |
default MAC for empty EEPROM after production. |
ac3315c26 new PHY @ e1000 -... |
1014 |
|
c609719b8 Initial revision |
1015 1016 |
CONFIG_EEPRO100 Support for Intel 82557/82559/82559ER chips. |
11ccc33fa Many spelling fix... |
1017 |
Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM |
c609719b8 Initial revision |
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
write routine for first time initialisation. CONFIG_TULIP Support for Digital 2114x chips. Optional CONFIG_TULIP_SELECT_MEDIA for board specific modem chip initialisation (KS8761/QS6611). CONFIG_NATSEMI Support for National dp83815 chips. CONFIG_NS8382X Support for National dp8382[01] gigabit chips. |
45219c466 Patch by Mathijs ... |
1030 |
- NETWORK Support (other): |
c041e9d21 new at91_emac net... |
1031 1032 1033 1034 1035 1036 1037 1038 1039 |
CONFIG_DRIVER_AT91EMAC Support for AT91RM9200 EMAC. CONFIG_RMII Define this to use reduced MII inteface CONFIG_DRIVER_AT91EMAC_QUIET If this defined, the driver is quiet. The driver doen't show link status messages. |
efdd73195 net: add Calxeda ... |
1040 1041 |
CONFIG_CALXEDA_XGMAC Support for the Calxeda XGMAC device |
3bb46d23f README : Rename C... |
1042 |
CONFIG_LAN91C96 |
45219c466 Patch by Mathijs ... |
1043 1044 1045 1046 1047 1048 1049 1050 |
Support for SMSC's LAN91C96 chips. CONFIG_LAN91C96_BASE Define this to hold the physical address of the LAN91C96's I/O space CONFIG_LAN91C96_USE_32_BIT Define this to enable 32 bit addressing |
3bb46d23f README : Rename C... |
1051 |
CONFIG_SMC91111 |
f39748ae8 * Patch by Paul R... |
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 |
Support for SMSC's LAN91C111 chip CONFIG_SMC91111_BASE Define this to hold the physical address of the device (I/O space) CONFIG_SMC_USE_32_BIT Define this if data bus is 32 bits CONFIG_SMC_USE_IOFUNCS Define this to use i/o functions instead of macros (some hardware wont work with macros) |
dc02badab arm, davinci_emac... |
1064 1065 1066 1067 1068 |
CONFIG_DRIVER_TI_EMAC Support for davinci emac CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT Define this if you have more then 3 PHYs. |
b3dbf4a51 ftgmac100: suppor... |
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 |
CONFIG_FTGMAC100 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet CONFIG_FTGMAC100_EGIGA Define this to use GE link update with gigabit PHY. Define this if FTGMAC100 is connected to gigabit PHY. If your system has 10/100 PHY only, it might not occur wrong behavior. Because PHY usually return timeout or useless data when polling gigabit status and gigabit control registers. This behavior won't affect the correctnessof 10/100 link speed update. |
c2fff331a smc911x: update S... |
1080 |
CONFIG_SMC911X |
557b377d8 smc911x: add 16 b... |
1081 |
Support for SMSC's LAN911x and LAN921x chips |
c2fff331a smc911x: update S... |
1082 |
CONFIG_SMC911X_BASE |
557b377d8 smc911x: add 16 b... |
1083 1084 |
Define this to hold the physical address of the device (I/O space) |
c2fff331a smc911x: update S... |
1085 |
CONFIG_SMC911X_32_BIT |
557b377d8 smc911x: add 16 b... |
1086 |
Define this if data bus is 32 bits |
c2fff331a smc911x: update S... |
1087 |
CONFIG_SMC911X_16_BIT |
557b377d8 smc911x: add 16 b... |
1088 1089 |
Define this if data bus is 16 bits. If your processor automatically converts one 32 bit word to two 16 bit |
c2fff331a smc911x: update S... |
1090 |
words you may also try CONFIG_SMC911X_32_BIT. |
557b377d8 smc911x: add 16 b... |
1091 |
|
3d0075fa7 README: add descr... |
1092 1093 1094 1095 1096 1097 1098 1099 |
CONFIG_SH_ETHER Support for Renesas on-chip Ethernet controller CONFIG_SH_ETHER_USE_PORT Define the number of ports to be used CONFIG_SH_ETHER_PHY_ADDR Define the ETH PHY's address |
68260aab9 net: sh_eth: add ... |
1100 1101 |
CONFIG_SH_ETHER_CACHE_WRITEBACK If this option is set, the driver enables cache flush. |
5e1247247 Introduce generic... |
1102 1103 1104 1105 1106 1107 1108 1109 1110 |
- TPM Support: CONFIG_GENERIC_LPC_TPM Support for generic parallel port TPM devices. Only one device per system is supported at this time. CONFIG_TPM_TIS_BASE_ADDRESS Base address where the generic TPM device is mapped to. Contemporary x86 systems usually map it at 0xfed40000. |
c609719b8 Initial revision |
1111 1112 |
- USB Support: At the moment only the UHCI host controller is |
4d13cbad1 * Patch by Toluna... |
1113 |
supported (PIP405, MIP405, MPC5200); define |
c609719b8 Initial revision |
1114 1115 |
CONFIG_USB_UHCI to enable it. define CONFIG_USB_KEYBOARD to enable the USB Keyboard |
30d56fae2 Patch by Sam Song... |
1116 |
and define CONFIG_USB_STORAGE to enable the USB |
c609719b8 Initial revision |
1117 1118 1119 1120 |
storage devices. Note: Supported are USB Keyboards and USB Floppy drives (TEAC FD-05PUB). |
4d13cbad1 * Patch by Toluna... |
1121 1122 1123 |
MPC5200 USB requires additional defines: CONFIG_USB_CLOCK for 528 MHz Clock: 0x0001bbbb |
307ecb6db Add support for U... |
1124 1125 |
CONFIG_PSC3_USB for USB on PSC3 |
4d13cbad1 * Patch by Toluna... |
1126 1127 1128 |
CONFIG_USB_CONFIG for differential drivers: 0x00001000 for single ended drivers: 0x00005000 |
307ecb6db Add support for U... |
1129 1130 |
for differential drivers on PSC3: 0x00000100 for single ended drivers on PSC3: 0x00004100 |
6d0f6bcf3 rename CFG_ macro... |
1131 |
CONFIG_SYS_USB_EVENT_POLL |
fdcfaa1b0 USB event poll su... |
1132 1133 |
May be defined to allow interrupt polling instead of using asynchronous interrupts |
4d13cbad1 * Patch by Toluna... |
1134 |
|
9ab4ce223 usb: Add support ... |
1135 1136 |
CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the txfilltuning field in the EHCI controller on reset. |
16c8d5e76 Various USB relat... |
1137 1138 1139 1140 |
- USB Device: Define the below if you wish to use the USB console. Once firmware is rebuilt from a serial console issue the command "setenv stdin usbtty; setenv stdout usbtty" and |
11ccc33fa Many spelling fix... |
1141 |
attach your USB cable. The Unix command "dmesg" should print |
16c8d5e76 Various USB relat... |
1142 1143 |
it has found a new device. The environment variable usbtty can be set to gserial or cdc_acm to enable your device to |
386eda022 Code cleanup |
1144 |
appear to a USB host as a Linux gserial device or a |
16c8d5e76 Various USB relat... |
1145 1146 1147 1148 1149 1150 1151 |
Common Device Class Abstract Control Model serial device. If you select usbtty = gserial you should be able to enumerate a Linux host by # modprobe usbserial vendor=0xVendorID product=0xProductID else if using cdc_acm, simply setting the environment variable usbtty to be cdc_acm should suffice. The following might be defined in YourBoardName.h |
386eda022 Code cleanup |
1152 |
|
16c8d5e76 Various USB relat... |
1153 1154 1155 1156 1157 1158 |
CONFIG_USB_DEVICE Define this to build a UDC device CONFIG_USB_TTY Define this to have a tty type of device available to talk to the UDC device |
386eda022 Code cleanup |
1159 |
|
f9da0f894 Enable high speed... |
1160 1161 1162 1163 1164 1165 1166 |
CONFIG_USBD_HS Define this to enable the high speed support for usb device and usbtty. If this feature is enabled, a routine int is_usbd_high_speed(void) also needs to be defined by the driver to dynamically poll whether the enumeration has succeded at high speed or full speed. |
6d0f6bcf3 rename CFG_ macro... |
1167 |
CONFIG_SYS_CONSOLE_IS_IN_ENV |
16c8d5e76 Various USB relat... |
1168 1169 1170 1171 |
Define this if you want stdin, stdout &/or stderr to be set to usbtty. mpc8xx: |
6d0f6bcf3 rename CFG_ macro... |
1172 |
CONFIG_SYS_USB_EXTC_CLK 0xBLAH |
16c8d5e76 Various USB relat... |
1173 |
Derive USB clock from external clock "blah" |
6d0f6bcf3 rename CFG_ macro... |
1174 |
- CONFIG_SYS_USB_EXTC_CLK 0x02 |
386eda022 Code cleanup |
1175 |
|
6d0f6bcf3 rename CFG_ macro... |
1176 |
CONFIG_SYS_USB_BRG_CLK 0xBLAH |
16c8d5e76 Various USB relat... |
1177 |
Derive USB clock from brgclk |
6d0f6bcf3 rename CFG_ macro... |
1178 |
- CONFIG_SYS_USB_BRG_CLK 0x04 |
16c8d5e76 Various USB relat... |
1179 |
|
386eda022 Code cleanup |
1180 |
If you have a USB-IF assigned VendorID then you may wish to |
16c8d5e76 Various USB relat... |
1181 |
define your own vendor specific values either in BoardName.h |
386eda022 Code cleanup |
1182 |
or directly in usbd_vendor_info.h. If you don't define |
16c8d5e76 Various USB relat... |
1183 1184 1185 1186 1187 1188 1189 |
CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot should pretend to be a Linux device to it's target host. CONFIG_USBD_MANUFACTURER Define this string as the name of your company for - CONFIG_USBD_MANUFACTURER "my company" |
386eda022 Code cleanup |
1190 |
|
16c8d5e76 Various USB relat... |
1191 1192 1193 1194 1195 1196 1197 1198 1199 |
CONFIG_USBD_PRODUCT_NAME Define this string as the name of your product - CONFIG_USBD_PRODUCT_NAME "acme usb device" CONFIG_USBD_VENDORID Define this as your assigned Vendor ID from the USB Implementors Forum. This *must* be a genuine Vendor ID to avoid polluting the USB namespace. - CONFIG_USBD_VENDORID 0xFFFF |
386eda022 Code cleanup |
1200 |
|
16c8d5e76 Various USB relat... |
1201 1202 1203 1204 |
CONFIG_USBD_PRODUCTID Define this as the unique Product ID for your device - CONFIG_USBD_PRODUCTID 0xFFFF |
4d13cbad1 * Patch by Toluna... |
1205 |
|
d70a560fd README: add docum... |
1206 1207 1208 1209 1210 1211 1212 1213 |
- ULPI Layer Support: The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via the generic ULPI layer. The generic layer accesses the ULPI PHY via the platform viewport, so you need both the genric layer and the viewport enabled. Currently only Chipidea/ARC based viewport is supported. To enable the ULPI layer support, define CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT in your board configuration file. |
6d365ea0a tegra20: add USB ... |
1214 1215 1216 |
If your ULPI phy needs a different reference clock than the standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to the appropriate value in Hz. |
c609719b8 Initial revision |
1217 |
|
71f951180 * Fix CONFIG_NET_... |
1218 |
- MMC Support: |
8bde7f776 * Code cleanup: |
1219 1220 1221 |
The MMC controller on the Intel PXA is supported. To enable this define CONFIG_MMC. The MMC can be accessed from the boot prompt by mapping the device |
71f951180 * Fix CONFIG_NET_... |
1222 |
to physical memory similar to flash. Command line is |
602ad3b33 README: Rewrite c... |
1223 1224 |
enabled with CONFIG_CMD_MMC. The MMC driver also works with the FAT fs. This is enabled with CONFIG_CMD_FAT. |
71f951180 * Fix CONFIG_NET_... |
1225 |
|
afb35666d mmc: sh_mmcif: ad... |
1226 1227 1228 1229 1230 1231 1232 1233 |
CONFIG_SH_MMCIF Support for Renesas on-chip MMCIF controller CONFIG_SH_MMCIF_ADDR Define the base address of MMCIF registers CONFIG_SH_MMCIF_CLK Define the clock frequency for MMCIF |
6705d81e9 * Patch by Andrea... |
1234 1235 1236 1237 |
- Journaling Flash filesystem support: CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, CONFIG_JFFS2_NAND_DEV Define these for a default partition on a NAND device |
6d0f6bcf3 rename CFG_ macro... |
1238 1239 |
CONFIG_SYS_JFFS2_FIRST_SECTOR, CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS |
6705d81e9 * Patch by Andrea... |
1240 |
Define these for a default partition on a NOR device |
6d0f6bcf3 rename CFG_ macro... |
1241 |
CONFIG_SYS_JFFS_CUSTOM_PART |
6705d81e9 * Patch by Andrea... |
1242 1243 1244 1245 |
Define this to create an own partition. You have to provide a function struct part_info* jffs2_part_info(int part_num) If you define only one JFFS2 partition you may also want to |
6d0f6bcf3 rename CFG_ macro... |
1246 |
#define CONFIG_SYS_JFFS_SINGLE_PART 1 |
6705d81e9 * Patch by Andrea... |
1247 1248 |
to disable the command chpart. This is the default when you have not defined a custom partition |
c30a15e59 FAT: Add FAT writ... |
1249 1250 |
- FAT(File Allocation Table) filesystem write function support: CONFIG_FAT_WRITE |
656f4c653 cmd_fat: add FAT ... |
1251 1252 1253 1254 1255 1256 |
Define this to enable support for saving memory data as a file in FAT formatted partition. This will also enable the command "fatwrite" enabling the user to write files to FAT. |
c30a15e59 FAT: Add FAT writ... |
1257 |
|
84cd93272 fs: Add a Coreboo... |
1258 1259 1260 1261 1262 1263 |
CBFS (Coreboot Filesystem) support CONFIG_CMD_CBFS Define this to enable support for reading from a Coreboot filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls and cbfsload. |
c609719b8 Initial revision |
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 |
- Keyboard Support: CONFIG_ISA_KEYBOARD Define this to enable standard (PC-Style) keyboard support CONFIG_I8042_KBD Standard PC keyboard driver with US (is default) and GERMAN key layout (switch via environment 'keymap=de') support. Export function i8042_kbd_init, i8042_tstc and i8042_getc for cfb_console. Supports cursor blinking. - Video support: CONFIG_VIDEO Define this to enable video support (for output to video). CONFIG_VIDEO_CT69000 Enable Chips & Technologies 69000 Video chip CONFIG_VIDEO_SMI_LYNXEM |
b79a11cc2 Code cleanup |
1287 |
Enable Silicon Motion SMI 712/710/810 Video chip. The |
eeb1b77b7 * Patch by Pierre... |
1288 1289 1290 |
video output is selected via environment 'videoout' (1 = LCD and 2 = CRT). If videoout is undefined, CRT is assumed. |
b79a11cc2 Code cleanup |
1291 |
For the CT69000 and SMI_LYNXEM drivers, videomode is |
11ccc33fa Many spelling fix... |
1292 |
selected via environment 'videomode'. Two different ways |
eeb1b77b7 * Patch by Pierre... |
1293 1294 |
are possible: - "videomode=num" 'num' is a standard LiLo mode numbers. |
6e5923851 * Cleanup, minor ... |
1295 |
Following standard modes are supported (* is default): |
eeb1b77b7 * Patch by Pierre... |
1296 1297 1298 1299 1300 1301 1302 1303 |
Colors 640x480 800x600 1024x768 1152x864 1280x1024 -------------+--------------------------------------------- 8 bits | 0x301* 0x303 0x305 0x161 0x307 15 bits | 0x310 0x313 0x316 0x162 0x319 16 bits | 0x311 0x314 0x317 0x163 0x31A 24 bits | 0x312 0x315 0x318 ? 0x31B -------------+--------------------------------------------- |
c609719b8 Initial revision |
1304 |
(i.e. setenv videomode 317; saveenv; reset;) |
b79a11cc2 Code cleanup |
1305 |
- "videomode=bootargs" all the video parameters are parsed |
7817cb208 fix comments with... |
1306 |
from the bootargs. (See drivers/video/videomodes.c) |
eeb1b77b7 * Patch by Pierre... |
1307 |
|
c1551ea81 U-Boot version en... |
1308 |
CONFIG_VIDEO_SED13806 |
43d9616cf * Patch by Robert... |
1309 |
Enable Epson SED13806 driver. This driver supports 8bpp |
a6c7ad2f6 * Fix startup pro... |
1310 1311 |
and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP or CONFIG_VIDEO_SED13806_16BPP |
7d3053fbf powerpc: clean up... |
1312 |
CONFIG_FSL_DIU_FB |
04e5ae793 Minor coding styl... |
1313 |
Enable the Freescale DIU video driver. Reference boards for |
7d3053fbf powerpc: clean up... |
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 |
SOCs that have a DIU should define this macro to enable DIU support, and should also define these other macros: CONFIG_SYS_DIU_ADDR CONFIG_VIDEO CONFIG_CMD_BMP CONFIG_CFB_CONSOLE CONFIG_VIDEO_SW_CURSOR CONFIG_VGA_AS_SINGLE_DEVICE CONFIG_VIDEO_LOGO CONFIG_VIDEO_BMP_LOGO |
ba8e76bd4 powerpc: use 'vid... |
1325 1326 1327 1328 |
The DIU driver will look for the 'video-mode' environment variable, and if defined, enable the DIU as a console during boot. See the documentation file README.video for a description of this variable. |
7d3053fbf powerpc: clean up... |
1329 |
|
058d59b08 x86: Build vga vi... |
1330 1331 1332 1333 1334 |
CONFIG_VIDEO_VGA Enable the VGA video / BIOS for x86. The alternative if you are using coreboot is to use the coreboot frame buffer driver. |
682011ff6 * Patches by Udi ... |
1335 |
- Keyboard Support: |
8bde7f776 * Code cleanup: |
1336 |
CONFIG_KEYBOARD |
682011ff6 * Patches by Udi ... |
1337 |
|
8bde7f776 * Code cleanup: |
1338 1339 1340 1341 |
Define this to enable a custom keyboard support. This simply calls drv_keyboard_init() which must be defined in your board-specific files. The only board using this so far is RBC823. |
a6c7ad2f6 * Fix startup pro... |
1342 |
|
c609719b8 Initial revision |
1343 1344 1345 1346 1347 |
- LCD Support: CONFIG_LCD Define this to enable LCD support (for output to LCD display); also select one of the supported displays by defining one of these: |
39cf48048 Add ATMEL LCD driver |
1348 1349 1350 |
CONFIG_ATMEL_LCD: HITACHI TX09D70VM1CCA, 3.5", 240x320. |
fd3103bb8 Add support for B... |
1351 |
CONFIG_NEC_NL6448AC33: |
c609719b8 Initial revision |
1352 |
|
fd3103bb8 Add support for B... |
1353 |
NEC NL6448AC33-18. Active, color, single scan. |
c609719b8 Initial revision |
1354 |
|
fd3103bb8 Add support for B... |
1355 |
CONFIG_NEC_NL6448BC20 |
c609719b8 Initial revision |
1356 |
|
fd3103bb8 Add support for B... |
1357 1358 1359 1360 1361 1362 |
NEC NL6448BC20-08. 6.5", 640x480. Active, color, single scan. CONFIG_NEC_NL6448BC33_54 NEC NL6448BC33-54. 10.4", 640x480. |
c609719b8 Initial revision |
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 |
Active, color, single scan. CONFIG_SHARP_16x9 Sharp 320x240. Active, color, single scan. It isn't 16x9, and I am not sure what it is. CONFIG_SHARP_LQ64D341 Sharp LQ64D341 display, 640x480. Active, color, single scan. CONFIG_HLD1045 HLD1045 display, 640x480. Active, color, single scan. CONFIG_OPTREX_BW Optrex CBL50840-2 NF-FW 99 22 M5 or Hitachi LMG6912RPFC-00T or Hitachi SP14Q002 320x240. Black & white. Normally display is black on white background; define |
6d0f6bcf3 rename CFG_ macro... |
1391 |
CONFIG_SYS_WHITE_ON_BLACK to get it inverted. |
c609719b8 Initial revision |
1392 |
|
45d7f5251 lcd: Implement RL... |
1393 1394 1395 |
CONFIG_LCD_BMP_RLE8 Support drawing of RLE8-compressed bitmaps on the LCD. |
735987c5a edid: Add I2C com... |
1396 1397 1398 1399 |
CONFIG_I2C_EDID Enables an 'i2c edid' command which can read EDID information over I2C from an attached LCD display. |
45d7f5251 lcd: Implement RL... |
1400 |
|
7152b1d0b * Add support for... |
1401 |
- Splash Screen Support: CONFIG_SPLASH_SCREEN |
d791b1dc3 * Make sure Block... |
1402 |
|
8bde7f776 * Code cleanup: |
1403 1404 1405 |
If this option is set, the environment is checked for a variable "splashimage". If found, the usual display of logo, copyright and system information on the LCD |
e94d2cd9d * Fix "cls" comma... |
1406 |
is suppressed and the BMP image at the address |
8bde7f776 * Code cleanup: |
1407 1408 1409 1410 |
specified in "splashimage" is loaded instead. The console is redirected to the "nulldev", too. This allows for a "silent" boot where a splash screen is loaded very quickly after power-on. |
d791b1dc3 * Make sure Block... |
1411 |
|
1ca298ced Added support for... |
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 |
CONFIG_SPLASH_SCREEN_ALIGN If this option is set the splash image can be freely positioned on the screen. Environment variable "splashpos" specifies the position as "x,y". If a positive number is given it is used as number of pixel from left/top. If a negative number is given it is used as number of pixel from right/bottom. You can also specify 'm' for centering the image. Example: setenv splashpos m,m => image at center of screen setenv splashpos 30,20 => image at x = 30 and y = 20 setenv splashpos -10,m => vertically centered image at x = dspWidth - bmpWidth - 9 |
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- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP If this option is set, additionally to standard BMP images, gzipped BMP images can be displayed via the splashscreen support or the bmp command. |
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- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 If this option is set, 8-bit RLE compressed BMP images can be displayed via the splashscreen support or the bmp command. |
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- Do compresssing for memory range: CONFIG_CMD_ZIP If this option is set, it would use zlib deflate method to compress the specified memory at its best effort. |
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- Compression support: CONFIG_BZIP2 If this option is set, support for bzip2 compressed images is included. If not, only uncompressed and gzip compressed images are supported. |
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NOTE: the bzip2 algorithm requires a lot of RAM, so |
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the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should |
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be at least 4MB. |
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|
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CONFIG_LZMA If this option is set, support for lzma compressed images is included. Note: The LZMA algorithm adds between 2 and 4KB of code and it requires an amount of dynamic memory that is given by the formula: (1846 + 768 << (lc + lp)) * sizeof(uint16) Where lc and lp stand for, respectively, Literal context bits and Literal pos bits. This value is upper-bounded by 14MB in the worst case. Anyway, for a ~4MB large kernel image, we have lc=3 and lp=0 for a total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is a very small buffer. Use the lzmainfo tool to determinate the lc and lp values and then calculate the amount of needed dynamic memory (ensuring |
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the appropriate CONFIG_SYS_MALLOC_LEN value). |
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|
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- MII/PHY support: CONFIG_PHY_ADDR The address of PHY on MII bus. CONFIG_PHY_CLOCK_FREQ (ppc4xx) The clock frequency of the MII bus CONFIG_PHY_GIGE If this option is set, support for speed/duplex |
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detection of gigabit PHY is included. |
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CONFIG_PHY_RESET_DELAY Some PHY like Intel LXT971A need extra delay after reset before any MII register access is possible. For such PHY, set this option to the usec delay required. (minimum 300usec for LXT971A) CONFIG_PHY_CMD_DELAY (ppc4xx) Some PHY like Intel LXT971A need extra delay after command issued before MII status register can be read |
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- Ethernet address: CONFIG_ETHADDR |
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CONFIG_ETH1ADDR |
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CONFIG_ETH2ADDR CONFIG_ETH3ADDR |
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CONFIG_ETH4ADDR CONFIG_ETH5ADDR |
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|
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Define a default value for Ethernet address to use for the respective Ethernet interface, in case this |
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is not determined automatically. - IP address: CONFIG_IPADDR Define a default value for the IP address to use for |
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the default Ethernet interface, in case this is not |
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determined through e.g. bootp. |
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(Environment variable "ipaddr") |
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- Server IP address: CONFIG_SERVERIP |
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Defines a default value for the IP address of a TFTP |
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server to contact when using the "tftboot" command. |
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(Environment variable "serverip") |
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|
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CONFIG_KEEP_SERVERADDR Keeps the server's MAC address, in the env 'serveraddr' for passing to bootargs (like Linux's netconsole option) |
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- Gateway IP address: CONFIG_GATEWAYIP Defines a default value for the IP address of the default router where packets to other networks are sent to. (Environment variable "gatewayip") - Subnet mask: CONFIG_NETMASK Defines a default value for the subnet mask (or routing prefix) which is used to determine if an IP address belongs to the local subnet or needs to be forwarded through a router. (Environment variable "netmask") |
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- Multicast TFTP Mode: CONFIG_MCAST_TFTP Defines whether you want to support multicast TFTP as per rfc-2090; for example to work with atftp. Lets lots of targets |
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tftp down the same boot image concurrently. Note: the Ethernet |
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driver in use must provide a function: mcast() to join/leave a multicast group. |
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- BOOTP Recovery Mode: CONFIG_BOOTP_RANDOM_DELAY If you have many targets in a network that try to boot using BOOTP, you may want to avoid that all systems send out BOOTP requests at precisely the same moment (which would happen for instance at recovery from a power failure, when all systems will try to boot, thus flooding the BOOTP server. Defining CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be inserted before sending out BOOTP requests. The |
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following delays are inserted then: |
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1st BOOTP request: delay 0 ... 1 sec 2nd BOOTP request: delay 0 ... 2 sec 3rd BOOTP request: delay 0 ... 4 sec 4th and following BOOTP requests: delay 0 ... 8 sec |
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- DHCP Advanced Options: |
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You can fine tune the DHCP functionality by defining CONFIG_BOOTP_* symbols: CONFIG_BOOTP_SUBNETMASK CONFIG_BOOTP_GATEWAY CONFIG_BOOTP_HOSTNAME CONFIG_BOOTP_NISDOMAIN CONFIG_BOOTP_BOOTPATH CONFIG_BOOTP_BOOTFILESIZE CONFIG_BOOTP_DNS CONFIG_BOOTP_DNS2 CONFIG_BOOTP_SEND_HOSTNAME CONFIG_BOOTP_NTPSERVER CONFIG_BOOTP_TIMEOFFSET CONFIG_BOOTP_VENDOREX |
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CONFIG_BOOTP_MAY_FAIL |
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|
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CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip environment variable, not the BOOTP server. |
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|
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CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found after the configured retry count, the call will fail instead of starting over. This can be used to fail over to Link-local IP address configuration if the DHCP server is not available. |
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CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS serverip from a DHCP server, it is possible that more than one DNS serverip is offered to the client. If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS serverip will be stored in the additional environment variable "dnsip2". The first DNS serverip is always stored in the variable "dnsip", when CONFIG_BOOTP_DNS |
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is defined. |
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CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable to do a dynamic update of a DNS server. To do this, they need the hostname of the DHCP requester. |
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If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content |
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of the "hostname" environment variable is passed as option 12 to the DHCP server. |
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|
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CONFIG_BOOTP_DHCP_REQUEST_DELAY A 32bit value in microseconds for a delay between receiving a "DHCP Offer" and sending the "DHCP Request". This fixes a problem with certain DHCP servers that don't respond 100% of the time to a "DHCP request". E.g. On an AT91RM9200 processor running at 180MHz, this delay needed to be *at least* 15,000 usec before a Windows Server 2003 DHCP server would reply 100% of the time. I recommend at least 50,000 usec to be safe. The alternative is to hope that one of the retries will be successful but note that the DHCP timeout and retry process takes a longer than this delay. |
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- Link-local IP address negotiation: Negotiate with other link-local clients on the local network for an address that doesn't require explicit configuration. This is especially useful if a DHCP server cannot be guaranteed to exist in all environments that the device must operate. See doc/README.link-local for more information. |
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- CDP Options: |
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CONFIG_CDP_DEVICE_ID |
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The device id used in CDP trigger frames. CONFIG_CDP_DEVICE_ID_PREFIX A two character string which is prefixed to the MAC address of the device. CONFIG_CDP_PORT_ID A printf format string which contains the ascii name of the port. Normally is set to "eth%d" which sets |
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eth0 for the first Ethernet, eth1 for the second etc. |
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CONFIG_CDP_CAPABILITIES A 32bit integer which indicates the device capabilities; 0x00000010 for a normal host which does not forwards. CONFIG_CDP_VERSION An ascii string containing the version of the software. CONFIG_CDP_PLATFORM An ascii string containing the name of the platform. CONFIG_CDP_TRIGGER A 32bit integer sent on the trigger. CONFIG_CDP_POWER_CONSUMPTION A 16bit integer containing the power consumption of the device in .1 of milliwatts. CONFIG_CDP_APPLIANCE_VLAN_TYPE A byte containing the id of the VLAN. |
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- Status LED: CONFIG_STATUS_LED Several configurations allow to display the current status using a LED. For instance, the LED will blink fast while running U-Boot code, stop blinking as soon as a reply to a BOOTP request was received, and start blinking slow once the Linux kernel is running (supported by a status LED driver in the Linux kernel). Defining CONFIG_STATUS_LED enables this feature in U-Boot. - CAN Support: CONFIG_CAN_DRIVER Defining CONFIG_CAN_DRIVER enables CAN driver support on those systems that support this (optional) feature, like the TQM8xxL modules. - I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C |
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These enable I2C serial bus commands. Defining either of |
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(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will |
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include the appropriate I2C driver for the selected CPU. |
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|
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This will allow you to use i2c commands at the u-boot |
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command line (as long as you set CONFIG_CMD_I2C in |
b37c7e5e5 * Patch by Seb Ja... |
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CONFIG_COMMANDS) and communicate with i2c based realtime clock chips. See common/cmd_i2c.c for a description of the |
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command line interface. |
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|
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CONFIG_HARD_I2C selects a hardware I2C controller. |
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|
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CONFIG_SOFT_I2C configures u-boot to use a software (aka |
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bit-banging) driver instead of CPM or similar hardware support for I2C. |
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|
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There are several other quantities that must also be |
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defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. |
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|
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In both cases you will need to define CONFIG_SYS_I2C_SPEED |
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to be the frequency (in Hz) at which you wish your i2c bus |
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to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie |
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the CPU's i2c node address). |
945af8d72 * Add support for... |
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|
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Now, the u-boot i2c code for the mpc8xx |
a47a12bec Move arch/ppc to ... |
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(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node |
8d321b81c Update README to ... |
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and so its address should therefore be cleared to 0 (See, eg, MPC823e User's Manual p.16-473). So, set CONFIG_SYS_I2C_SLAVE to 0. |
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|
5da71efa1 Reset i2c slave d... |
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CONFIG_SYS_I2C_INIT_MPC5XXX When a board is reset during an i2c bus transfer chips might think that the current transfer is still in progress. Reset the slave devices by sending start commands until the slave device responds. |
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That's all that's required for CONFIG_HARD_I2C. |
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|
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If you use the software i2c interface (CONFIG_SOFT_I2C) then the following macros need to be defined (examples are from include/configs/lwmon.h): |
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I2C_INIT |
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(Optional). Any commands necessary to enable the I2C |
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controller or configure ports. |
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|
ba56f6257 Patch by Travis S... |
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eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) |
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|
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I2C_PORT |
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(Only for MPC8260 CPU). The I/O port to use (the code assumes both bits are on the same port). Valid values are 0..3 for ports A..D. |
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I2C_ACTIVE The code necessary to make the I2C data line active (driven). If the data line is open collector, this define can be null. |
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eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) |
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I2C_TRISTATE The code necessary to make the I2C data line tri-stated (inactive). If the data line is open collector, this define can be null. |
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eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) |
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I2C_READ Code that returns TRUE if the I2C data line is high, FALSE if it is low. |
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eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) |
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I2C_SDA(bit) If <bit> is TRUE, sets the I2C data line high. If it is FALSE, it clears it (low). |
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eg: #define I2C_SDA(bit) \ |
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if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ |
ba56f6257 Patch by Travis S... |
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else immr->im_cpm.cp_pbdat &= ~PB_SDA |
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|
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I2C_SCL(bit) If <bit> is TRUE, sets the I2C clock line high. If it is FALSE, it clears it (low). |
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eg: #define I2C_SCL(bit) \ |
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if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ |
ba56f6257 Patch by Travis S... |
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else immr->im_cpm.cp_pbdat &= ~PB_SCL |
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|
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I2C_DELAY This delay is invoked four times per clock cycle so this controls the rate of data transfer. The data rate thus |
b37c7e5e5 * Patch by Seb Ja... |
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is 1 / (I2C_DELAY * 4). Often defined to be something |
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like: |
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#define I2C_DELAY udelay(2) |
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|
793b5726f i2c: soft_i2c: ad... |
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CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA If your arch supports the generic GPIO framework (asm/gpio.h), then you may alternatively define the two GPIOs that are to be used as SCL / SDA. Any of the previous I2C_xxx macros will have GPIO-based defaults assigned to them as appropriate. You should define these to the GPIO value as given directly to the generic GPIO functions. |
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CONFIG_SYS_I2C_INIT_BOARD |
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|
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When a board is reset during an i2c bus transfer chips might think that the current transfer is still in progress. On some boards it is possible to access the i2c SCLK line directly, either by using the processor pin as a GPIO or by having a second pin connected to the bus. If this option is defined a custom i2c_init_board() routine in boards/xxx/board.c is run early in the boot sequence. |
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|
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CONFIG_SYS_I2C_BOARD_LATE_INIT An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is defined a custom i2c_board_late_init() routine in boards/xxx/board.c is run AFTER the operations in i2c_init() is completed. This callpoint can be used to unreset i2c bus using CPU i2c controller register accesses for CPUs whose i2c controller provide such a method. It is called at the end of i2c_init() to allow i2c_init operations to setup the i2c bus controller on the CPU (e.g. setting bus speed & slave address). |
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CONFIG_I2CFAST (PPC405GP|PPC405EP only) This option enables configuration of bi_iic_fast[] flags in u-boot bd_info structure based on u-boot environment variable "i2cfast". (see also i2cfast) |
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CONFIG_I2C_MULTI_BUS This option allows the use of multiple I2C buses, each of which |
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must have a controller. At any point in time, only one bus is active. To switch to a different bus, use the 'i2c dev' command. |
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Note that bus numbering is zero-based. |
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CONFIG_SYS_I2C_NOPROBES |
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This option specifies a list of I2C devices that will be skipped |
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when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS |
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is set, specify a list of bus-device pairs. Otherwise, specify a 1D array of device addresses |
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e.g. #undef CONFIG_I2C_MULTI_BUS |
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#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} |
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will skip addresses 0x50 and 0x68 on a board with one I2C bus |
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#define CONFIG_I2C_MULTI_BUS |
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#define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} |
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will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 |
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CONFIG_SYS_SPD_BUS_NUM |
be5e61815 mpc83xx: Update 8... |
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If defined, then this indicates the I2C bus number for DDR SPD. If not defined, then U-Boot assumes that SPD is on I2C bus 0. |
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CONFIG_SYS_RTC_BUS_NUM |
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If defined, then this indicates the I2C bus number for the RTC. If not defined, then U-Boot assumes that RTC is on I2C bus 0. |
6d0f6bcf3 rename CFG_ macro... |
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CONFIG_SYS_DTT_BUS_NUM |
0dc018ece [PATCH] I2C: Add ... |
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If defined, then this indicates the I2C bus number for the DTT. If not defined, then U-Boot assumes that DTT is on I2C bus 0. |
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CONFIG_SYS_I2C_DTT_ADDR: |
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If defined, specifies the I2C address of the DTT device. If not defined, then U-Boot uses predefined value for specified DTT device. |
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CONFIG_FSL_I2C Define this option if you want to use Freescale's I2C driver in |
7817cb208 fix comments with... |
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drivers/i2c/fsl_i2c.c. |
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|
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CONFIG_I2C_MUX Define this option if you have I2C devices reached over 1 .. n I2C Muxes like the pca9544a. This option addes a new I2C Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a new I2C Bus to the existing I2C Busses. If you select the new Bus with "i2c dev", u-bbot sends first the commandos for the muxes to activate this new "bus". CONFIG_I2C_MULTI_BUS must be also defined, to use this feature! Example: Adding a new I2C Bus reached over 2 pca9544a muxes The First mux with address 70 and channel 6 The Second mux with address 71 and channel 4 => i2c bus pca9544a:70:6:pca9544a:71:4 Use the "i2c bus" command without parameter, to get a list of I2C Busses with muxes: => i2c bus Busses reached over muxes: Bus ID: 2 reached over Mux(es): pca9544a@70 ch: 4 Bus ID: 3 reached over Mux(es): pca9544a@70 ch: 6 pca9544a@71 ch: 4 => If you now switch to the new I2C Bus 3 with "i2c dev 3" |
f9a78b8d4 cosmetic: spell f... |
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u-boot first sends the command to the mux@70 to enable channel 6, and then the command to the mux@71 to enable |
67b23a322 I2C: adding new "... |
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the channel 4. After that, you can use the "normal" i2c commands as |
f9a78b8d4 cosmetic: spell f... |
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usual to communicate with your I2C devices behind |
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the 2 muxes. This option is actually implemented for the bitbanging algorithm in common/soft_i2c.c and for the Hardware I2C Bus on the MPC8260. But it should be not so difficult to add this option to other architectures. |
2ac6985a7 soft_i2c.c add op... |
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CONFIG_SOFT_I2C_READ_REPEATED_START defining this will force the i2c_read() function in the soft_i2c driver to perform an I2C repeated start between writing the address pointer and reading the data. If this define is omitted the default behaviour of doing a stop-start sequence will be used. Most I2C devices can use either method, but some require one or the other. |
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|
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- SPI Support: CONFIG_SPI Enables SPI driver (so far only tested with SPI EEPROM, also an instance works with Crystal A/D and D/As on the SACSng board) |
6639562e6 spi: add support ... |
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CONFIG_SH_SPI Enables the driver for SPI controller on SuperH. Currently only SH7757 is supported. |
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CONFIG_SPI_X Enables extended (16-bit) SPI EEPROM addressing. (symmetrical to CONFIG_I2C_X) CONFIG_SOFT_SPI |
43d9616cf * Patch by Robert... |
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Enables a software (bit-bang) SPI driver rather than using hardware support. This is a general purpose driver that only requires three general I/O port pins (two outputs, one input) to function. If this is defined, the board configuration must define several SPI configuration items (port pins to use, etc). For an example, see include/configs/sacsng.h. |
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|
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CONFIG_HARD_SPI Enables a hardware SPI driver for general-purpose reads and writes. As with CONFIG_SOFT_SPI, the board configuration must define a list of chip-select function pointers. |
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Currently supported on some MPC8xxx processors. For an |
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example, see include/configs/mpc8349emds.h. |
38254f45b New i.MX31 SPI dr... |
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CONFIG_MXC_SPI Enables the driver for the SPI controllers on i.MX and MXC |
2e3cd1cda README: Fix suppo... |
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SoCs. Currently i.MX31/35/51 are supported. |
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|
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- FPGA Support: CONFIG_FPGA |
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|
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Enables FPGA subsystem. CONFIG_FPGA_<vendor> Enables support for specific chip vendors. (ALTERA, XILINX) |
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|
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CONFIG_FPGA_<family> |
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|
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Enables support for FPGA family. (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) CONFIG_FPGA_COUNT Specify the number of FPGA devices to support. |
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|
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CONFIG_SYS_FPGA_PROG_FEEDBACK |
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|
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Enable printing of hash marks during FPGA configuration. |
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|
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CONFIG_SYS_FPGA_CHECK_BUSY |
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|
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Enable checks on FPGA configuration interface busy status by the configuration function. This option will require a board or device specific function to be written. |
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CONFIG_FPGA_DELAY If defined, a function that provides delays in the FPGA configuration driver. |
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CONFIG_SYS_FPGA_CHECK_CTRLC |
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Allow Control-C to interrupt FPGA configuration |
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CONFIG_SYS_FPGA_CHECK_ERROR |
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|
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Check for configuration errors during FPGA bitfile loading. For example, abort during Virtex II configuration if the INIT_B line goes low (which indicated a CRC error). |
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|
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CONFIG_SYS_FPGA_WAIT_INIT |
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|
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Maximum time to wait for the INIT_B line to deassert after PROB_B has been deasserted during a Virtex II FPGA configuration sequence. The default time is 500 |
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ms. |
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|
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CONFIG_SYS_FPGA_WAIT_BUSY |
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|
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Maximum time to wait for BUSY to deassert during |
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Virtex II FPGA configuration. The default is 5 ms. |
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|
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CONFIG_SYS_FPGA_WAIT_CONFIG |
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|
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Time to wait after FPGA configuration. The default is |
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200 ms. |
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2019 2020 2021 |
- Configuration Management: CONFIG_IDENT_STRING |
43d9616cf * Patch by Robert... |
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If defined, this string will be added to the U-Boot version information (U_BOOT_VERSION) |
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- Vendor Parameter Protection: |
43d9616cf * Patch by Robert... |
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U-Boot considers the values of the environment variables "serial#" (Board Serial Number) and |
7152b1d0b * Add support for... |
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"ethaddr" (Ethernet Address) to be parameters that |
43d9616cf * Patch by Robert... |
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are set once by the board vendor / manufacturer, and protects these variables from casual modification by the user. Once set, these variables are read-only, and write or delete attempts are rejected. You can |
11ccc33fa Many spelling fix... |
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change this behaviour: |
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If CONFIG_ENV_OVERWRITE is #defined in your config file, the write protection for vendor parameters is |
47cd00fa7 * Patches by Robe... |
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completely disabled. Anybody can change or delete |
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these parameters. Alternatively, if you #define _both_ CONFIG_ETHADDR _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default |
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Ethernet address is installed in the environment, |
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which can be changed exactly ONCE by the user. [The serial# is unaffected by this, i. e. it remains read-only.] |
2598090b7 env: Add environm... |
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The same can be accomplished in a more flexible way for any variable by configuring the type of access to allow for those variables in the ".flags" variable or define CONFIG_ENV_FLAGS_LIST_STATIC. |
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- Protected RAM: CONFIG_PRAM Define this variable to enable the reservation of "protected RAM", i. e. RAM which is not overwritten by U-Boot. Define CONFIG_PRAM to hold the number of kB you want to reserve for pRAM. You can overwrite this default value by defining an environment variable "pram" to the number of kB you want to reserve. Note that the board info structure will still show the full amount of RAM. If pRAM is reserved, a new environment variable "mem" will automatically be defined to hold the amount of remaining RAM in a form that can be passed as boot argument to Linux, for instance like that: |
fe126d8b3 Change all '$(...... |
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setenv bootargs ... mem=\${mem} |
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saveenv This way you can tell Linux not to use this memory, either, which results in a memory region that will not be affected by reboots. *WARNING* If your board configuration uses automatic detection of the RAM size, you must make sure that this memory test is non-destructive. So far, the following board configurations are known to be "pRAM-clean": |
1b0757ece PPC: remove dead ... |
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IVMS8, IVML24, SPD8xx, TQM8xxL, HERMES, IP860, RPXlite, LWMON, |
544d97e9a PCU_E: remove cod... |
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FLAGADM, TQM8260 |
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|
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- Access to physical memory region (> 4GB) Some basic support is provided for operations on memory not normally accessible to U-Boot - e.g. some architectures support access to more than 4GB of memory on 32-bit machines using physical address extension or similar. Define CONFIG_PHYSMEM to access this basic support, which currently only supports clearing the memory. |
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- Error Recovery: CONFIG_PANIC_HANG Define this variable to stop the system in case of a fatal error, so that you have to reset it manually. This is probably NOT a good idea for an embedded |
11ccc33fa Many spelling fix... |
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system where you want the system to reboot |
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automatically as fast as possible, but it may be useful during development since you can try to debug the conditions that lead to the situation. CONFIG_NET_RETRY_COUNT |
43d9616cf * Patch by Robert... |
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This variable defines the number of retries for network operations like ARP, RARP, TFTP, or BOOTP before giving up the operation. If not defined, a default value of 5 is used. |
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|
40cb90ee2 net: make ARP tim... |
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CONFIG_ARP_TIMEOUT Timeout waiting for an ARP reply in milliseconds. |
48a3e999c net: nfs: make NF... |
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CONFIG_NFS_TIMEOUT Timeout in milliseconds used in NFS protocol. If you encounter "ERROR: Cannot umount" in nfs command, try longer timeout such as #define CONFIG_NFS_TIMEOUT 10000UL |
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2114 |
- Command Interpreter: |
8078f1a5f README says CFG_A... |
2115 |
CONFIG_AUTO_COMPLETE |
04a85b3b3 * Patches by Pant... |
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Enable auto completion of commands using TAB. |
a9398e018 Minor code cleanu... |
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Note that this feature has NOT been implemented yet for the "hush" shell. |
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|
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CONFIG_SYS_HUSH_PARSER |
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Define this variable to enable the "hush" shell (from Busybox) as command line interpreter, thus enabling powerful command line syntax like if...then...else...fi conditionals or `&&' and '||' constructs ("shell scripts"). If undefined, you get the old, much simpler behaviour with a somewhat smaller memory footprint. |
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CONFIG_SYS_PROMPT_HUSH_PS2 |
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This defines the secondary prompt string, which is printed when the command interpreter needs more input to complete a command. Usually "> ". Note: |
8bde7f776 * Code cleanup: |
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In the current implementation, the local variables space and global environment variables space are separated. Local variables are those you define by simply typing `name=value'. To access a local variable later on, you have write `$name' or `${name}'; to execute the contents of a variable directly type `$name' at the command prompt. |
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|
43d9616cf * Patch by Robert... |
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Global environment variables are those you use setenv/printenv to work with. To run a command stored in such a variable, you need to use the run command, and you must not use the '$' sign to access them. |
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To store commands and special characters in a variable, please use double quotation marks surrounding the whole text of the variable, instead of the backslashes before semicolons and special symbols. |
aa0c71aca Document CONFIG_C... |
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- Commandline Editing and History: CONFIG_CMDLINE_EDITING |
11ccc33fa Many spelling fix... |
2158 |
Enable editing and History functions for interactive |
b9365a26a Code cleanup |
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commandline input operations |
aa0c71aca Document CONFIG_C... |
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|
a8c7c708a * Patch by Gleb N... |
2161 |
- Default Environment: |
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2162 |
CONFIG_EXTRA_ENV_SETTINGS |
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Define this to contain any number of null terminated strings (variable = value pairs) that will be part of |
7152b1d0b * Add support for... |
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the default environment compiled into the boot image. |
2262cfeef * Patch by Daniel... |
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|
43d9616cf * Patch by Robert... |
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For example, place something like this in your board's config file: |
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#define CONFIG_EXTRA_ENV_SETTINGS \ "myvar1=value1\0" \ "myvar2=value2\0" |
43d9616cf * Patch by Robert... |
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Warning: This method is based on knowledge about the internal format how the environment is stored by the U-Boot code. This is NOT an official, exported interface! Although it is unlikely that this format |
7152b1d0b * Add support for... |
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will change soon, there is no guarantee either. |
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2178 |
You better know what you are doing here. |
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Note: overly (ab)use of the default environment is discouraged. Make sure to check other ways to preset |
74de7aefd Add "source" comm... |
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the environment like the "source" command or the |
43d9616cf * Patch by Robert... |
2182 |
boot command first. |
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|
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CONFIG_ENV_VARS_UBOOT_CONFIG Define this in order to add variables describing the U-Boot build configuration to the default environment. These will be named arch, cpu, board, vendor, and soc. Enabling this option will cause the following to be defined: - CONFIG_SYS_ARCH - CONFIG_SYS_CPU - CONFIG_SYS_BOARD - CONFIG_SYS_VENDOR - CONFIG_SYS_SOC |
7e27f89fd README: Document ... |
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CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG Define this in order to add variables describing certain run-time determined information about the hardware to the environment. These will be named board_name, board_rev. |
a8c7c708a * Patch by Gleb N... |
2202 |
- DataFlash Support: |
2abbe0754 * Patch by Nicola... |
2203 |
CONFIG_HAS_DATAFLASH |
8bde7f776 * Code cleanup: |
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Defining this option enables DataFlash features and allows to read/write in Dataflash via the standard commands cp, md... |
2abbe0754 * Patch by Nicola... |
2207 |
|
f61ec45eb README: Add descr... |
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 |
- Serial Flash support CONFIG_CMD_SF Defining this option enables SPI flash commands 'sf probe/read/write/erase/update'. Usage requires an initial 'probe' to define the serial flash parameters, followed by read/write/erase/update commands. The following defaults may be provided by the platform to handle the common case when only a single serial flash is present on the system. CONFIG_SF_DEFAULT_BUS Bus identifier CONFIG_SF_DEFAULT_CS Chip-select CONFIG_SF_DEFAULT_MODE (see include/spi.h) CONFIG_SF_DEFAULT_SPEED in Hz |
3f85ce278 * CVS add missing... |
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- SystemACE Support: CONFIG_SYSTEMACE Adding this option adds support for Xilinx SystemACE chips attached via some sort of local bus. The address |
11ccc33fa Many spelling fix... |
2231 |
of the chip must also be defined in the |
6d0f6bcf3 rename CFG_ macro... |
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CONFIG_SYS_SYSTEMACE_BASE macro. For example: |
3f85ce278 * CVS add missing... |
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#define CONFIG_SYSTEMACE |
6d0f6bcf3 rename CFG_ macro... |
2235 |
#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000 |
3f85ce278 * CVS add missing... |
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When SystemACE support is added, the "ace" device type becomes available to the fat commands, i.e. fatls. |
ecb0ccd9c Allow to force TF... |
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- TFTP Fixed UDP Port: CONFIG_TFTP_PORT |
28cb93758 Update for TFTP u... |
2241 |
If this is defined, the environment variable tftpsrcp |
ecb0ccd9c Allow to force TF... |
2242 |
is used to supply the TFTP UDP source port value. |
28cb93758 Update for TFTP u... |
2243 |
If tftpsrcp isn't defined, the normal pseudo-random port |
ecb0ccd9c Allow to force TF... |
2244 |
number generator is used. |
28cb93758 Update for TFTP u... |
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Also, the environment variable tftpdstp is used to supply the TFTP UDP destination port value. If tftpdstp isn't defined, the normal port 69 is used. The purpose for tftpsrcp is to allow a TFTP server to |
ecb0ccd9c Allow to force TF... |
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blindly start the TFTP transfer using the pre-configured target IP address and UDP port. This has the effect of "punching through" the (Windows XP) firewall, allowing the remainder of the TFTP transfer to proceed normally. A better solution is to properly configure the firewall, but sometimes that is not allowed. |
bf36c5d52 Add hash command ... |
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- Hashing support: CONFIG_CMD_HASH This enables a generic 'hash' command which can produce hashes / digests from a few algorithms (e.g. SHA1, SHA256). CONFIG_HASH_VERIFY Enable the hash verify command (hash -v). This adds to code size a little. CONFIG_SHA1 - support SHA1 hashing CONFIG_SHA256 - support SHA256 hashing Note: There is also a sha1sum command, which should perhaps be deprecated in favour of 'hash sha1'. |
a8c7c708a * Patch by Gleb N... |
2272 |
- Show boot progress: |
c609719b8 Initial revision |
2273 |
CONFIG_SHOW_BOOT_PROGRESS |
43d9616cf * Patch by Robert... |
2274 2275 2276 2277 2278 2279 |
Defining this option allows to add some board- specific code (calling a user-provided function "show_boot_progress(int)") that enables you to show the system's boot progress on some display (for example, some LED's) on your board. At the moment, the following checkpoints are implemented: |
c609719b8 Initial revision |
2280 |
|
3a608ca01 bootstage: Implem... |
2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 |
- Detailed boot stage timing CONFIG_BOOTSTAGE Define this option to get detailed timing of each stage of the boot process. CONFIG_BOOTSTAGE_USER_COUNT This is the number of available user bootstage records. Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...) a new ID will be allocated from this stash. If you exceed the limit, recording will stop. CONFIG_BOOTSTAGE_REPORT Define this to print a report before boot, similar to this: Timer summary in microseconds: Mark Elapsed Stage 0 0 reset 3,575,678 3,575,678 board_init_f start 3,575,695 17 arch_cpu_init A9 3,575,777 82 arch_cpu_init done 3,659,598 83,821 board_init_r start 3,910,375 250,777 main_loop 29,916,167 26,005,792 bootm_start 30,361,327 445,160 start_kernel |
2eba38cf8 bootstage: Add bo... |
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CONFIG_CMD_BOOTSTAGE Add a 'bootstage' command which supports printing a report and un/stashing of bootstage data. |
94fd1316b bootstage: Store ... |
2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 |
CONFIG_BOOTSTAGE_FDT Stash the bootstage information in the FDT. A root 'bootstage' node is created with each bootstage id as a child. Each child has a 'name' property and either 'mark' containing the mark time in microsecond, or 'accum' containing the accumulated time for that bootstage id in microseconds. For example: bootstage { 154 { name = "board_init_f"; mark = <3575678>; }; 170 { name = "lcd"; accum = <33482>; }; }; Code in the Linux kernel can find this in /proc/devicetree. |
1372cce2b [new uImage] Use ... |
2328 |
Legacy uImage format: |
c609719b8 Initial revision |
2329 2330 |
Arg Where When 1 common/cmd_bootm.c before attempting to boot an image |
ba56f6257 Patch by Travis S... |
2331 |
-1 common/cmd_bootm.c Image header has bad magic number |
c609719b8 Initial revision |
2332 |
2 common/cmd_bootm.c Image header has correct magic number |
ba56f6257 Patch by Travis S... |
2333 |
-2 common/cmd_bootm.c Image header has bad checksum |
c609719b8 Initial revision |
2334 |
3 common/cmd_bootm.c Image header has correct checksum |
ba56f6257 Patch by Travis S... |
2335 |
-3 common/cmd_bootm.c Image data has bad checksum |
c609719b8 Initial revision |
2336 2337 2338 |
4 common/cmd_bootm.c Image data has correct checksum -4 common/cmd_bootm.c Image is for unsupported architecture 5 common/cmd_bootm.c Architecture check OK |
1372cce2b [new uImage] Use ... |
2339 |
-5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) |
c609719b8 Initial revision |
2340 2341 2342 2343 |
6 common/cmd_bootm.c Image Type check OK -6 common/cmd_bootm.c gunzip uncompression error -7 common/cmd_bootm.c Unimplemented compression type 7 common/cmd_bootm.c Uncompression OK |
1372cce2b [new uImage] Use ... |
2344 |
8 common/cmd_bootm.c No uncompress/copy overwrite error |
c609719b8 Initial revision |
2345 |
-9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) |
1372cce2b [new uImage] Use ... |
2346 2347 2348 2349 2350 2351 2352 2353 |
9 common/image.c Start initial ramdisk verification -10 common/image.c Ramdisk header has bad magic number -11 common/image.c Ramdisk header has bad checksum 10 common/image.c Ramdisk header is OK -12 common/image.c Ramdisk data has bad checksum 11 common/image.c Ramdisk data has correct checksum 12 common/image.c Ramdisk verification complete, start loading |
11ccc33fa Many spelling fix... |
2354 |
-13 common/image.c Wrong Image Type (not PPC Linux ramdisk) |
1372cce2b [new uImage] Use ... |
2355 2356 |
13 common/image.c Start multifile image verification 14 common/image.c No initial ramdisk, no multifile, continue. |
c0f40859f README: white-spa... |
2357 |
15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS |
c609719b8 Initial revision |
2358 |
|
a47a12bec Move arch/ppc to ... |
2359 |
-30 arch/powerpc/lib/board.c Fatal error, hang the system |
11dadd547 * Patch by Steven... |
2360 2361 |
-31 post/post.c POST test failed, detected by post_output_backlog() -32 post/post.c POST test failed, detected by post_run_single() |
63e73c9a8 * Patches by Rein... |
2362 |
|
566a494f5 [PCS440EP] u... |
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 |
34 common/cmd_doc.c before loading a Image from a DOC device -35 common/cmd_doc.c Bad usage of "doc" command 35 common/cmd_doc.c correct usage of "doc" command -36 common/cmd_doc.c No boot device 36 common/cmd_doc.c correct boot device -37 common/cmd_doc.c Unknown Chip ID on boot device 37 common/cmd_doc.c correct chip ID found, device available -38 common/cmd_doc.c Read Error on boot device 38 common/cmd_doc.c reading Image header from DOC device OK -39 common/cmd_doc.c Image header has bad magic number 39 common/cmd_doc.c Image header has correct magic number -40 common/cmd_doc.c Error reading Image from DOC device 40 common/cmd_doc.c Image header has correct magic number 41 common/cmd_ide.c before loading a Image from a IDE device -42 common/cmd_ide.c Bad usage of "ide" command 42 common/cmd_ide.c correct usage of "ide" command -43 common/cmd_ide.c No boot device 43 common/cmd_ide.c boot device found -44 common/cmd_ide.c Device not available 44 common/cmd_ide.c Device available -45 common/cmd_ide.c wrong partition selected 45 common/cmd_ide.c partition selected -46 common/cmd_ide.c Unknown partition table 46 common/cmd_ide.c valid partition table found -47 common/cmd_ide.c Invalid partition type 47 common/cmd_ide.c correct partition type -48 common/cmd_ide.c Error reading Image Header on boot device 48 common/cmd_ide.c reading Image Header from IDE device OK -49 common/cmd_ide.c Image header has bad magic number 49 common/cmd_ide.c Image header has correct magic number -50 common/cmd_ide.c Image header has bad checksum 50 common/cmd_ide.c Image header has correct checksum -51 common/cmd_ide.c Error reading Image from IDE device 51 common/cmd_ide.c reading Image from IDE device OK 52 common/cmd_nand.c before loading a Image from a NAND device -53 common/cmd_nand.c Bad usage of "nand" command 53 common/cmd_nand.c correct usage of "nand" command -54 common/cmd_nand.c No boot device 54 common/cmd_nand.c boot device found -55 common/cmd_nand.c Unknown Chip ID on boot device 55 common/cmd_nand.c correct chip ID found, device available -56 common/cmd_nand.c Error reading Image Header on boot device 56 common/cmd_nand.c reading Image Header from NAND device OK -57 common/cmd_nand.c Image header has bad magic number 57 common/cmd_nand.c Image header has correct magic number -58 common/cmd_nand.c Error reading Image from NAND device 58 common/cmd_nand.c reading Image from NAND device OK -60 common/env_common.c Environment has a bad CRC, using default |
11ccc33fa Many spelling fix... |
2412 |
64 net/eth.c starting with Ethernet configuration. |
566a494f5 [PCS440EP] u... |
2413 2414 2415 2416 2417 |
-64 net/eth.c no Ethernet found. 65 net/eth.c Ethernet found. -80 common/cmd_net.c usage wrong 80 common/cmd_net.c before calling NetLoop() |
11ccc33fa Many spelling fix... |
2418 |
-81 common/cmd_net.c some error in NetLoop() occurred |
566a494f5 [PCS440EP] u... |
2419 2420 2421 |
81 common/cmd_net.c NetLoop() back without error -82 common/cmd_net.c size == 0 (File with size 0 loaded) 82 common/cmd_net.c trying automatic boot |
74de7aefd Add "source" comm... |
2422 2423 |
83 common/cmd_net.c running "source" command -83 common/cmd_net.c some error in automatic boot or "source" command |
566a494f5 [PCS440EP] u... |
2424 |
84 common/cmd_net.c end without errors |
c609719b8 Initial revision |
2425 |
|
1372cce2b [new uImage] Use ... |
2426 2427 2428 2429 2430 2431 2432 2433 2434 |
FIT uImage format: Arg Where When 100 common/cmd_bootm.c Kernel FIT Image has correct format -100 common/cmd_bootm.c Kernel FIT Image has incorrect format 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration -101 common/cmd_bootm.c Can't get configuration for kernel subimage 102 common/cmd_bootm.c Kernel unit name specified -103 common/cmd_bootm.c Can't get kernel subimage node offset |
f773bea8e [new uImage] Add ... |
2435 |
103 common/cmd_bootm.c Found configuration node |
1372cce2b [new uImage] Use ... |
2436 2437 2438 2439 2440 |
104 common/cmd_bootm.c Got kernel subimage node offset -104 common/cmd_bootm.c Kernel subimage hash verification failed 105 common/cmd_bootm.c Kernel subimage hash verification OK -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture 106 common/cmd_bootm.c Architecture check OK |
11ccc33fa Many spelling fix... |
2441 2442 |
-106 common/cmd_bootm.c Kernel subimage has wrong type 107 common/cmd_bootm.c Kernel subimage type OK |
1372cce2b [new uImage] Use ... |
2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 |
-107 common/cmd_bootm.c Can't get kernel subimage data/size 108 common/cmd_bootm.c Got kernel subimage data/size -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) -109 common/cmd_bootm.c Can't get kernel subimage type -110 common/cmd_bootm.c Can't get kernel subimage comp -111 common/cmd_bootm.c Can't get kernel subimage os -112 common/cmd_bootm.c Can't get kernel subimage load address -113 common/cmd_bootm.c Image uncompress/copy overwrite error 120 common/image.c Start initial ramdisk verification -120 common/image.c Ramdisk FIT image has incorrect format 121 common/image.c Ramdisk FIT image has correct format |
11ccc33fa Many spelling fix... |
2455 |
122 common/image.c No ramdisk subimage unit name, using configuration |
1372cce2b [new uImage] Use ... |
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 |
-122 common/image.c Can't get configuration for ramdisk subimage 123 common/image.c Ramdisk unit name specified -124 common/image.c Can't get ramdisk subimage node offset 125 common/image.c Got ramdisk subimage node offset -125 common/image.c Ramdisk subimage hash verification failed 126 common/image.c Ramdisk subimage hash verification OK -126 common/image.c Ramdisk subimage for unsupported architecture 127 common/image.c Architecture check OK -127 common/image.c Can't get ramdisk subimage data/size 128 common/image.c Got ramdisk subimage data/size 129 common/image.c Can't get ramdisk load address -129 common/image.c Got ramdisk load address |
11ccc33fa Many spelling fix... |
2468 |
-130 common/cmd_doc.c Incorrect FIT image format |
1372cce2b [new uImage] Use ... |
2469 |
131 common/cmd_doc.c FIT image format OK |
11ccc33fa Many spelling fix... |
2470 |
-140 common/cmd_ide.c Incorrect FIT image format |
1372cce2b [new uImage] Use ... |
2471 |
141 common/cmd_ide.c FIT image format OK |
11ccc33fa Many spelling fix... |
2472 |
-150 common/cmd_nand.c Incorrect FIT image format |
1372cce2b [new uImage] Use ... |
2473 |
151 common/cmd_nand.c FIT image format OK |
d95f6ec73 fdt: Add option t... |
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 |
- FIT image support: CONFIG_FIT Enable support for the FIT uImage format. CONFIG_FIT_BEST_MATCH When no configuration is explicitly selected, default to the one whose fdt's compatibility field best matches that of U-Boot itself. A match is considered "best" if it matches the most specific compatibility entry of U-Boot's fdt's root node. The order of entries in the configuration's fdt is ignored. |
4cf2609b0 README: fix docum... |
2484 2485 |
- Standalone program support: CONFIG_STANDALONE_LOAD_ADDR |
6feff899e README: fix typos... |
2486 2487 2488 |
This option defines a board specific value for the address where standalone program gets loaded, thus overwriting the architecture dependent default |
4cf2609b0 README: fix docum... |
2489 2490 2491 2492 2493 2494 2495 2496 2497 |
settings. - Frame Buffer Address: CONFIG_FB_ADDR Define CONFIG_FB_ADDR if you want to use specific address for frame buffer. Then system will reserve the frame buffer address to defined address instead of lcd_setmem (this function |
6feff899e README: fix typos... |
2498 |
grabs the memory for frame buffer by panel's size). |
4cf2609b0 README: fix docum... |
2499 2500 |
Please see board_init_f function. |
cccfc2ab7 README: Rearrange... |
2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 |
- Automatic software updates via TFTP server CONFIG_UPDATE_TFTP CONFIG_UPDATE_TFTP_CNT_MAX CONFIG_UPDATE_TFTP_MSEC_MAX These options enable and control the auto-update feature; for a more detailed description refer to doc/README.update. - MTD Support (mtdparts command, UBI support) CONFIG_MTD_DEVICE Adds the MTD device infrastructure from the Linux kernel. Needed for mtdparts command support. CONFIG_MTD_PARTITIONS Adds the MTD partitioning infrastructure from the Linux kernel. Needed for UBI support. |
6a11cf48a spl: add initial ... |
2519 |
- SPL framework |
04e5ae793 Minor coding styl... |
2520 2521 |
CONFIG_SPL Enable building of SPL globally. |
6a11cf48a spl: add initial ... |
2522 |
|
95579793b README: document ... |
2523 2524 2525 2526 2527 |
CONFIG_SPL_LDSCRIPT LDSCRIPT for linking the SPL binary. CONFIG_SPL_MAX_SIZE Maximum binary size (text, data and rodata) of the SPL binary. |
04e5ae793 Minor coding styl... |
2528 2529 |
CONFIG_SPL_TEXT_BASE TEXT_BASE for linking the SPL binary. |
6a11cf48a spl: add initial ... |
2530 |
|
94a45bb19 powerpc/mpc85xx/p... |
2531 2532 2533 |
CONFIG_SPL_RELOC_TEXT_BASE Address to relocate to. If unspecified, this is equal to CONFIG_SPL_TEXT_BASE (i.e. no relocation is done). |
95579793b README: document ... |
2534 2535 2536 2537 2538 2539 2540 2541 |
CONFIG_SPL_BSS_START_ADDR Link address for the BSS within the SPL binary. CONFIG_SPL_BSS_MAX_SIZE Maximum binary size of the BSS section of the SPL binary. CONFIG_SPL_STACK Adress of the start of the stack SPL will use |
94a45bb19 powerpc/mpc85xx/p... |
2542 2543 2544 2545 |
CONFIG_SPL_RELOC_STACK Adress of the start of the stack SPL will use after relocation. If unspecified, this is equal to CONFIG_SPL_STACK. |
95579793b README: document ... |
2546 2547 2548 2549 2550 |
CONFIG_SYS_SPL_MALLOC_START Starting address of the malloc pool used in SPL. CONFIG_SYS_SPL_MALLOC_SIZE The size of the malloc pool used in SPL. |
6a11cf48a spl: add initial ... |
2551 |
|
47f7bcae8 SPL: Move the oma... |
2552 2553 2554 2555 |
CONFIG_SPL_FRAMEWORK Enable the SPL framework under common/. This framework supports MMC, NAND and YMODEM loading of U-Boot and NAND NAND loading of the Linux Kernel. |
861a86f46 omap-common: SPL:... |
2556 2557 2558 |
CONFIG_SPL_DISPLAY_PRINT For ARM, enable an optional function to print more information about the running system. |
4b919725b spl/powerpc: intr... |
2559 2560 |
CONFIG_SPL_INIT_MINIMAL Arch init code should be built for a very small image |
04e5ae793 Minor coding styl... |
2561 2562 |
CONFIG_SPL_LIBCOMMON_SUPPORT Support for common/libcommon.o in SPL binary |
6a11cf48a spl: add initial ... |
2563 |
|
04e5ae793 Minor coding styl... |
2564 2565 |
CONFIG_SPL_LIBDISK_SUPPORT Support for disk/libdisk.o in SPL binary |
6a11cf48a spl: add initial ... |
2566 |
|
04e5ae793 Minor coding styl... |
2567 2568 |
CONFIG_SPL_I2C_SUPPORT Support for drivers/i2c/libi2c.o in SPL binary |
6a11cf48a spl: add initial ... |
2569 |
|
04e5ae793 Minor coding styl... |
2570 2571 |
CONFIG_SPL_GPIO_SUPPORT Support for drivers/gpio/libgpio.o in SPL binary |
6a11cf48a spl: add initial ... |
2572 |
|
04e5ae793 Minor coding styl... |
2573 2574 |
CONFIG_SPL_MMC_SUPPORT Support for drivers/mmc/libmmc.o in SPL binary |
6a11cf48a spl: add initial ... |
2575 |
|
95579793b README: document ... |
2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 |
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR, CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS, CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION Address, size and partition on the MMC to load U-Boot from when the MMC is being used in raw mode. CONFIG_SPL_FAT_SUPPORT Support for fs/fat/libfat.o in SPL binary CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME Filename to read to load U-Boot when reading from FAT |
6f2f01b9f spl/nand: introdu... |
2587 2588 2589 2590 2591 2592 2593 2594 2595 |
CONFIG_SPL_NAND_BASE Include nand_base.c in the SPL. Requires CONFIG_SPL_NAND_DRIVERS. CONFIG_SPL_NAND_DRIVERS SPL uses normal NAND drivers, not minimal drivers. CONFIG_SPL_NAND_ECC Include standard software ECC in the SPL |
95579793b README: document ... |
2596 |
CONFIG_SPL_NAND_SIMPLE |
7d4b79552 spl/nand: config ... |
2597 2598 |
Support for NAND boot using simple NAND drivers that expose the cmd_ctrl() interface. |
95579793b README: document ... |
2599 2600 2601 2602 2603 2604 2605 |
CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT, CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE, CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS, CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE, CONFIG_SYS_NAND_ECCBYTES Defines the size and behavior of the NAND that SPL uses |
7d4b79552 spl/nand: config ... |
2606 |
to read U-Boot |
95579793b README: document ... |
2607 2608 |
CONFIG_SYS_NAND_U_BOOT_OFFS |
7d4b79552 spl/nand: config ... |
2609 2610 2611 2612 2613 2614 2615 |
Location in NAND to read U-Boot from CONFIG_SYS_NAND_U_BOOT_DST Location in memory to load U-Boot to CONFIG_SYS_NAND_U_BOOT_SIZE Size of image to load |
95579793b README: document ... |
2616 2617 |
CONFIG_SYS_NAND_U_BOOT_START |
7d4b79552 spl/nand: config ... |
2618 |
Entry point in loaded image to jump to |
95579793b README: document ... |
2619 2620 2621 2622 2623 2624 2625 2626 |
CONFIG_SYS_NAND_HW_ECC_OOBFIRST Define this if you need to first read the OOB and then the data. This is used for example on davinci plattforms. CONFIG_SPL_OMAP3_ID_NAND Support for an OMAP3-specific set of functions to return the ID and MFR of the first attached NAND chip, if present. |
04e5ae793 Minor coding styl... |
2627 2628 |
CONFIG_SPL_SERIAL_SUPPORT Support for drivers/serial/libserial.o in SPL binary |
6a11cf48a spl: add initial ... |
2629 |
|
04e5ae793 Minor coding styl... |
2630 2631 |
CONFIG_SPL_SPI_FLASH_SUPPORT Support for drivers/mtd/spi/libspi_flash.o in SPL binary |
6a11cf48a spl: add initial ... |
2632 |
|
04e5ae793 Minor coding styl... |
2633 2634 |
CONFIG_SPL_SPI_SUPPORT Support for drivers/spi/libspi.o in SPL binary |
c57b953da SPL: Add support ... |
2635 2636 2637 |
CONFIG_SPL_RAM_DEVICE Support for running image already present in ram, in SPL binary |
6a11cf48a spl: add initial ... |
2638 |
|
04e5ae793 Minor coding styl... |
2639 2640 |
CONFIG_SPL_LIBGENERIC_SUPPORT Support for lib/libgeneric.o in SPL binary |
1372cce2b [new uImage] Use ... |
2641 |
|
ca2fca223 spl: introduce CO... |
2642 2643 2644 2645 |
CONFIG_SPL_TARGET Final target image containing SPL and payload. Some SPLs use an arch-specific makefile fragment instead, for example if more than one image needs to be produced. |
c609719b8 Initial revision |
2646 2647 |
Modem Support: -------------- |
566e5cf45 ARM: drop unsuppo... |
2648 |
[so far only for SMDK2400 boards] |
c609719b8 Initial revision |
2649 |
|
11ccc33fa Many spelling fix... |
2650 |
- Modem support enable: |
c609719b8 Initial revision |
2651 2652 2653 2654 2655 2656 2657 |
CONFIG_MODEM_SUPPORT - RTS/CTS Flow control enable: CONFIG_HWFLOW - Modem debug support: CONFIG_MODEM_SUPPORT_DEBUG |
43d9616cf * Patch by Robert... |
2658 2659 |
Enables debugging stuff (char screen[1024], dbg()) for modem support. Useful only with BDI2000. |
c609719b8 Initial revision |
2660 |
|
a8c7c708a * Patch by Gleb N... |
2661 |
- Interrupt support (PPC): |
d4ca31c40 * Cleanup lowboot... |
2662 2663 |
There are common interrupt_init() and timer_interrupt() for all PPC archs. interrupt_init() calls interrupt_init_cpu() |
11ccc33fa Many spelling fix... |
2664 |
for CPU specific initialization. interrupt_init_cpu() |
d4ca31c40 * Cleanup lowboot... |
2665 |
should set decrementer_count to appropriate value. If |
11ccc33fa Many spelling fix... |
2666 |
CPU resets decrementer automatically after interrupt |
d4ca31c40 * Cleanup lowboot... |
2667 |
(ppc4xx) it should set decrementer_count to zero. |
11ccc33fa Many spelling fix... |
2668 |
timer_interrupt() calls timer_interrupt_cpu() for CPU |
d4ca31c40 * Cleanup lowboot... |
2669 2670 2671 |
specific handling. If board has watchdog / status_led / other_activity_monitor it works automatically from general timer_interrupt(). |
a8c7c708a * Patch by Gleb N... |
2672 |
|
c609719b8 Initial revision |
2673 |
- General: |
43d9616cf * Patch by Robert... |
2674 2675 2676 |
In the target system modem support is enabled when a specific key (key combination) is pressed during power-on. Otherwise U-Boot will boot normally |
11ccc33fa Many spelling fix... |
2677 |
(autoboot). The key_pressed() function is called from |
43d9616cf * Patch by Robert... |
2678 2679 2680 |
board_init(). Currently key_pressed() is a dummy function, returning 1 and thus enabling modem initialization. |
c609719b8 Initial revision |
2681 |
|
43d9616cf * Patch by Robert... |
2682 2683 2684 |
If there are no modem init strings in the environment, U-Boot proceed to autoboot; the previous output (banner, info printfs) will be |
11ccc33fa Many spelling fix... |
2685 |
suppressed, though. |
c609719b8 Initial revision |
2686 2687 |
See also: doc/README.Modem |
9660e442d cosmetic: s/BOARD... |
2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 |
Board initialization settings: ------------------------------ During Initialization u-boot calls a number of board specific functions to allow the preparation of board specific prerequisites, e.g. pin setup before drivers are initialized. To enable these callbacks the following configuration macros have to be defined. Currently this is architecture specific, so please check arch/your_architecture/lib/board.c typically in board_init_f() and board_init_r(). - CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f() - CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r() - CONFIG_BOARD_LATE_INIT: Call board_late_init() - CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init() |
c609719b8 Initial revision |
2702 |
|
c609719b8 Initial revision |
2703 2704 |
Configuration Settings: ----------------------- |
6d0f6bcf3 rename CFG_ macro... |
2705 |
- CONFIG_SYS_LONGHELP: Defined when you want long help messages included; |
c609719b8 Initial revision |
2706 |
undefine this when you're short of memory. |
2fb2604d5 Command usage cle... |
2707 2708 |
- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default width of the commands listed in the 'help' command output. |
6d0f6bcf3 rename CFG_ macro... |
2709 |
- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to |
c609719b8 Initial revision |
2710 |
prompt for user input. |
6d0f6bcf3 rename CFG_ macro... |
2711 |
- CONFIG_SYS_CBSIZE: Buffer size for input from the Console |
c609719b8 Initial revision |
2712 |
|
6d0f6bcf3 rename CFG_ macro... |
2713 |
- CONFIG_SYS_PBSIZE: Buffer size for Console output |
c609719b8 Initial revision |
2714 |
|
6d0f6bcf3 rename CFG_ macro... |
2715 |
- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands |
c609719b8 Initial revision |
2716 |
|
6d0f6bcf3 rename CFG_ macro... |
2717 |
- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to |
c609719b8 Initial revision |
2718 2719 |
the application (usually a Linux kernel) when it is booted |
6d0f6bcf3 rename CFG_ macro... |
2720 |
- CONFIG_SYS_BAUDRATE_TABLE: |
c609719b8 Initial revision |
2721 |
List of legal baudrate settings for this board. |
6d0f6bcf3 rename CFG_ macro... |
2722 |
- CONFIG_SYS_CONSOLE_INFO_QUIET |
8bde7f776 * Code cleanup: |
2723 |
Suppress display of console information at boot. |
c609719b8 Initial revision |
2724 |
|
6d0f6bcf3 rename CFG_ macro... |
2725 |
- CONFIG_SYS_CONSOLE_IS_IN_ENV |
8bde7f776 * Code cleanup: |
2726 2727 2728 |
If the board specific function extern int overwrite_console (void); returns 1, the stdin, stderr and stdout are switched to the |
c609719b8 Initial revision |
2729 |
serial port, else the settings in the environment are used. |
6d0f6bcf3 rename CFG_ macro... |
2730 |
- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE |
8bde7f776 * Code cleanup: |
2731 |
Enable the call to overwrite_console(). |
c609719b8 Initial revision |
2732 |
|
6d0f6bcf3 rename CFG_ macro... |
2733 |
- CONFIG_SYS_CONSOLE_ENV_OVERWRITE |
c609719b8 Initial revision |
2734 |
Enable overwrite of previous console environment settings. |
6d0f6bcf3 rename CFG_ macro... |
2735 |
- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: |
c609719b8 Initial revision |
2736 2737 |
Begin and End addresses of the area used by the simple memory test. |
6d0f6bcf3 rename CFG_ macro... |
2738 |
- CONFIG_SYS_ALT_MEMTEST: |
8bde7f776 * Code cleanup: |
2739 |
Enable an alternate, more extensive memory test. |
c609719b8 Initial revision |
2740 |
|
6d0f6bcf3 rename CFG_ macro... |
2741 |
- CONFIG_SYS_MEMTEST_SCRATCH: |
5f535fe17 * Patches by Ande... |
2742 2743 |
Scratch address used by the alternate memory test You only need to set this if address zero isn't writeable |
6d0f6bcf3 rename CFG_ macro... |
2744 2745 |
- CONFIG_SYS_MEM_TOP_HIDE (PPC only): If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, |
14f73ca67 ppc: Add CFG_MEM_... |
2746 |
this specified memory area will get subtracted from the top |
11ccc33fa Many spelling fix... |
2747 |
(end) of RAM and won't get "touched" at all by U-Boot. By |
14f73ca67 ppc: Add CFG_MEM_... |
2748 2749 2750 |
fixing up gd->ram_size the Linux kernel should gets passed the now "corrected" memory size and won't touch it either. This should work for arch/ppc and arch/powerpc. Only Linux |
5e12e75d1 ppc: Small change... |
2751 |
board ports in arch/powerpc with bootwrapper support that |
14f73ca67 ppc: Add CFG_MEM_... |
2752 |
recalculate the memory size from the SDRAM controller setup |
5e12e75d1 ppc: Small change... |
2753 |
will have to get fixed in Linux additionally. |
14f73ca67 ppc: Add CFG_MEM_... |
2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 |
This option can be used as a workaround for the 440EPx/GRx CHIP 11 errata where the last 256 bytes in SDRAM shouldn't be touched. WARNING: Please make sure that this value is a multiple of the Linux page size (normally 4k). If this is not the case, then the end address of the Linux memory will be located at a non page size aligned address and this could cause major problems. |
6d0f6bcf3 rename CFG_ macro... |
2764 |
- CONFIG_SYS_TFTP_LOADADDR: |
c609719b8 Initial revision |
2765 |
Default load address for network file downloads |
6d0f6bcf3 rename CFG_ macro... |
2766 |
- CONFIG_SYS_LOADS_BAUD_CHANGE: |
c609719b8 Initial revision |
2767 |
Enable temporary baudrate change while serial download |
6d0f6bcf3 rename CFG_ macro... |
2768 |
- CONFIG_SYS_SDRAM_BASE: |
c609719b8 Initial revision |
2769 |
Physical start address of SDRAM. _Must_ be 0 here. |
6d0f6bcf3 rename CFG_ macro... |
2770 |
- CONFIG_SYS_MBIO_BASE: |
c609719b8 Initial revision |
2771 2772 |
Physical start address of Motherboard I/O (if using a Cogent motherboard) |
6d0f6bcf3 rename CFG_ macro... |
2773 |
- CONFIG_SYS_FLASH_BASE: |
c609719b8 Initial revision |
2774 |
Physical start address of Flash memory. |
6d0f6bcf3 rename CFG_ macro... |
2775 |
- CONFIG_SYS_MONITOR_BASE: |
c609719b8 Initial revision |
2776 2777 |
Physical start address of boot monitor code (set by make config files to be same as the text base address |
14d0a02a1 Rename TEXT_BASE ... |
2778 |
(CONFIG_SYS_TEXT_BASE) used when linking) - same as |
6d0f6bcf3 rename CFG_ macro... |
2779 |
CONFIG_SYS_FLASH_BASE when booting from flash. |
c609719b8 Initial revision |
2780 |
|
6d0f6bcf3 rename CFG_ macro... |
2781 |
- CONFIG_SYS_MONITOR_LEN: |
8bde7f776 * Code cleanup: |
2782 2783 2784 2785 |
Size of memory reserved for monitor code, used to determine _at_compile_time_ (!) if the environment is embedded within the U-Boot image, or in a separate flash sector. |
c609719b8 Initial revision |
2786 |
|
6d0f6bcf3 rename CFG_ macro... |
2787 |
- CONFIG_SYS_MALLOC_LEN: |
c609719b8 Initial revision |
2788 |
Size of DRAM reserved for malloc() use. |
6d0f6bcf3 rename CFG_ macro... |
2789 |
- CONFIG_SYS_BOOTM_LEN: |
15940c9af Change max size o... |
2790 2791 |
Normally compressed uImages are limited to an uncompressed size of 8 MBytes. If this is not enough, |
6d0f6bcf3 rename CFG_ macro... |
2792 |
you can define CONFIG_SYS_BOOTM_LEN in your board config file |
15940c9af Change max size o... |
2793 |
to adjust this setting to your needs. |
6d0f6bcf3 rename CFG_ macro... |
2794 |
- CONFIG_SYS_BOOTMAPSZ: |
c609719b8 Initial revision |
2795 2796 |
Maximum size of memory mapped by the startup code of the Linux kernel; all data that must be processed by |
7d721e34a Boot-related docu... |
2797 2798 2799 2800 |
the Linux kernel (bd_info, boot arguments, FDT blob if used) must be put below this limit, unless "bootm_low" enviroment variable is defined and non-zero. In such case all data for the Linux kernel must be between "bootm_low" |
c0f40859f README: white-spa... |
2801 |
and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment |
c3624e6ed Default to bootm_... |
2802 2803 2804 |
variable "bootm_mapsize" will override the value of CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, then the value in "bootm_size" will be used instead. |
c609719b8 Initial revision |
2805 |
|
fca43cc80 boot: change some... |
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 |
- CONFIG_SYS_BOOT_RAMDISK_HIGH: Enable initrd_high functionality. If defined then the initrd_high feature is enabled and the bootm ramdisk subcommand is enabled. - CONFIG_SYS_BOOT_GET_CMDLINE: Enables allocating and saving kernel cmdline in space between "bootm_low" and "bootm_low" + BOOTMAPSZ. - CONFIG_SYS_BOOT_GET_KBD: Enables allocating and saving a kernel copy of the bd_info in space between "bootm_low" and "bootm_low" + BOOTMAPSZ. |
6d0f6bcf3 rename CFG_ macro... |
2818 |
- CONFIG_SYS_MAX_FLASH_BANKS: |
c609719b8 Initial revision |
2819 |
Max number of Flash memory banks |
6d0f6bcf3 rename CFG_ macro... |
2820 |
- CONFIG_SYS_MAX_FLASH_SECT: |
c609719b8 Initial revision |
2821 |
Max number of sectors on a Flash chip |
6d0f6bcf3 rename CFG_ macro... |
2822 |
- CONFIG_SYS_FLASH_ERASE_TOUT: |
c609719b8 Initial revision |
2823 |
Timeout for Flash erase operations (in ms) |
6d0f6bcf3 rename CFG_ macro... |
2824 |
- CONFIG_SYS_FLASH_WRITE_TOUT: |
c609719b8 Initial revision |
2825 |
Timeout for Flash write operations (in ms) |
6d0f6bcf3 rename CFG_ macro... |
2826 |
- CONFIG_SYS_FLASH_LOCK_TOUT |
8564acf93 * Patches by Yuli... |
2827 |
Timeout for Flash set sector lock bit operation (in ms) |
6d0f6bcf3 rename CFG_ macro... |
2828 |
- CONFIG_SYS_FLASH_UNLOCK_TOUT |
8564acf93 * Patches by Yuli... |
2829 |
Timeout for Flash clear lock bits operation (in ms) |
6d0f6bcf3 rename CFG_ macro... |
2830 |
- CONFIG_SYS_FLASH_PROTECTION |
8564acf93 * Patches by Yuli... |
2831 2832 |
If defined, hardware flash sectors protection is used instead of U-Boot software protection. |
6d0f6bcf3 rename CFG_ macro... |
2833 |
- CONFIG_SYS_DIRECT_FLASH_TFTP: |
c609719b8 Initial revision |
2834 2835 2836 2837 2838 2839 2840 2841 |
Enable TFTP transfers directly to flash memory; without this option such a download has to be performed in two steps: (1) download to RAM, and (2) copy from RAM to flash. The two-step approach is usually more reliable, since you can check if the download worked before you erase |
11ccc33fa Many spelling fix... |
2842 2843 |
the flash, but in some situations (when system RAM is too limited to allow for a temporary copy of the |
c609719b8 Initial revision |
2844 |
downloaded image) this option may be very useful. |
6d0f6bcf3 rename CFG_ macro... |
2845 |
- CONFIG_SYS_FLASH_CFI: |
43d9616cf * Patch by Robert... |
2846 |
Define if the flash driver uses extra elements in the |
5653fc335 * Patch by Yuli B... |
2847 |
common flash structure for storing flash geometry. |
00b1883a4 drivers/mtd: Move... |
2848 |
- CONFIG_FLASH_CFI_DRIVER |
5653fc335 * Patch by Yuli B... |
2849 2850 |
This option also enables the building of the cfi_flash driver in the drivers directory |
c609719b8 Initial revision |
2851 |
|
91809ed51 cfi-mtd: Add cfi-... |
2852 2853 2854 2855 |
- CONFIG_FLASH_CFI_MTD This option enables the building of the cfi_mtd driver in the drivers directory. The driver exports CFI flash to the MTD layer. |
6d0f6bcf3 rename CFG_ macro... |
2856 |
- CONFIG_SYS_FLASH_USE_BUFFER_WRITE |
96ef831f7 cfi_flash: Suppor... |
2857 2858 2859 2860 2861 |
Use buffered writes to flash. - CONFIG_FLASH_SPANSION_S29WS_N s29ws-n MirrorBit flash has non-standard addresses for buffered write commands. |
6d0f6bcf3 rename CFG_ macro... |
2862 |
- CONFIG_SYS_FLASH_QUIET_TEST |
5568e613e Add support for P... |
2863 2864 2865 2866 |
If this option is defined, the common CFI flash doesn't print it's warning upon not recognized FLASH banks. This is useful, if some of the configured banks are only optionally available. |
9a042e9ca Flash programming... |
2867 2868 2869 2870 |
- CONFIG_FLASH_SHOW_PROGRESS If defined (must be an integer), print out countdown digits and dots. Recommended value: 45 (9..1) for 80 column displays, 15 (3..1) for 40 column displays. |
6d0f6bcf3 rename CFG_ macro... |
2871 |
- CONFIG_SYS_RX_ETH_BUFFER: |
11ccc33fa Many spelling fix... |
2872 2873 |
Defines the number of Ethernet receive buffers. On some Ethernet controllers it is recommended to set this value |
53cf9435c - CFG_RX_ETH_BUFF... |
2874 2875 |
to 8 or even higher (EEPRO100 or 405 EMAC), since all buffers can be full shortly after enabling the interface |
11ccc33fa Many spelling fix... |
2876 |
on high Ethernet traffic. |
53cf9435c - CFG_RX_ETH_BUFF... |
2877 |
Defaults to 4 if not defined. |
ea882baf9 New implementatio... |
2878 |
- CONFIG_ENV_MAX_ENTRIES |
071bc9233 Coding Style cleanup |
2879 2880 2881 2882 2883 |
Maximum number of entries in the hash table that is used internally to store the environment settings. The default setting is supposed to be generous and should work in most cases. This setting can be used to tune behaviour; see lib/hashtable.c for details. |
ea882baf9 New implementatio... |
2884 |
|
2598090b7 env: Add environm... |
2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 |
- CONFIG_ENV_FLAGS_LIST_DEFAULT - CONFIG_ENV_FLAGS_LIST_STATIC Enable validation of the values given to enviroment variables when calling env set. Variables can be restricted to only decimal, hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, the variables can also be restricted to IP address or MAC address. The format of the list is: type_attribute = [s|d|x|b|i|m] attributes = type_attribute entry = variable_name[:attributes] list = entry[,list] The type attributes are: s - String (default) d - Decimal x - Hexadecimal b - Boolean ([1yYtT|0nNfF]) i - IP address m - MAC address - CONFIG_ENV_FLAGS_LIST_DEFAULT Define this to a list (string) to define the ".flags" envirnoment variable in the default or embedded environment. - CONFIG_ENV_FLAGS_LIST_STATIC Define this to a list (string) to define validation that should be done if an entry is not found in the ".flags" environment variable. To override a setting in the static list, simply add an entry for the same variable name to the ".flags" variable. |
c609719b8 Initial revision |
2916 2917 2918 |
The following definitions that deal with the placement and management of environment data (variable area); in general, we support the following configurations: |
c3eb3fe49 env: allow people... |
2919 2920 2921 2922 |
- CONFIG_BUILD_ENVCRC: Builds up envcrc with the target environment so that external utils may easily extract it and embed it in final U-Boot images. |
5a1aceb06 rename CFG_ENV_IS... |
2923 |
- CONFIG_ENV_IS_IN_FLASH: |
c609719b8 Initial revision |
2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 |
Define this if the environment is in flash memory. a) The environment occupies one whole flash sector, which is "embedded" in the text segment with the U-Boot code. This happens usually with "bottom boot sector" or "top boot sector" type flash chips, which have several smaller sectors at the start or the end. For instance, such a layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In such a case you would place the environment in one of the 4 kB sectors - with U-Boot code before and after it. With "top boot sector" type flash chips, you would put the environment in one of the last sectors, leaving a gap between U-Boot and the environment. |
0e8d15866 rename CFG_ENV ma... |
2938 |
- CONFIG_ENV_OFFSET: |
c609719b8 Initial revision |
2939 2940 2941 2942 2943 |
Offset of environment data (variable area) to the beginning of flash memory; for instance, with bottom boot type flash chips the second sector can be used: the offset for this sector is given here. |
6d0f6bcf3 rename CFG_ macro... |
2944 |
CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. |
c609719b8 Initial revision |
2945 |
|
0e8d15866 rename CFG_ENV ma... |
2946 |
- CONFIG_ENV_ADDR: |
c609719b8 Initial revision |
2947 2948 2949 |
This is just another way to specify the start address of the flash sector containing the environment (instead of |
0e8d15866 rename CFG_ENV ma... |
2950 |
CONFIG_ENV_OFFSET). |
c609719b8 Initial revision |
2951 |
|
0e8d15866 rename CFG_ENV ma... |
2952 |
- CONFIG_ENV_SECT_SIZE: |
c609719b8 Initial revision |
2953 2954 2955 2956 2957 2958 2959 |
Size of the sector containing the environment. b) Sometimes flash chips have few, equal sized, BIG sectors. In such a case you don't want to spend a whole sector for the environment. |
0e8d15866 rename CFG_ENV ma... |
2960 |
- CONFIG_ENV_SIZE: |
c609719b8 Initial revision |
2961 |
|
5a1aceb06 rename CFG_ENV_IS... |
2962 |
If you use this in combination with CONFIG_ENV_IS_IN_FLASH |
0e8d15866 rename CFG_ENV ma... |
2963 |
and CONFIG_ENV_SECT_SIZE, you can specify to use only a part |
c609719b8 Initial revision |
2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 |
of this flash sector for the environment. This saves memory for the RAM copy of the environment. It may also save flash memory if you decide to use this when your environment is "embedded" within U-Boot code, since then the remainder of the flash sector could be used for U-Boot code. It should be pointed out that this is STRONGLY DISCOURAGED from a robustness point of view: updating the environment in flash makes it always necessary to erase the WHOLE sector. If something goes wrong before the contents has been restored from a copy in RAM, your target system will be dead. |
0e8d15866 rename CFG_ENV ma... |
2976 2977 |
- CONFIG_ENV_ADDR_REDUND CONFIG_ENV_SIZE_REDUND |
c609719b8 Initial revision |
2978 |
|
43d9616cf * Patch by Robert... |
2979 |
These settings describe a second storage area used to hold |
11ccc33fa Many spelling fix... |
2980 |
a redundant copy of the environment data, so that there is |
3e38691e8 * Patch by Arun D... |
2981 |
a valid backup copy in case there is a power failure during |
43d9616cf * Patch by Robert... |
2982 |
a "saveenv" operation. |
c609719b8 Initial revision |
2983 2984 2985 2986 |
BE CAREFUL! Any changes to the flash layout, and some changes to the source code will make it necessary to adapt <board>/u-boot.lds* accordingly! |
9314cee69 rename CFG_ENV_IS... |
2987 |
- CONFIG_ENV_IS_IN_NVRAM: |
c609719b8 Initial revision |
2988 2989 2990 2991 |
Define this if you have some non-volatile memory device (NVRAM, battery buffered SRAM) which you want to use for the environment. |
0e8d15866 rename CFG_ENV ma... |
2992 2993 |
- CONFIG_ENV_ADDR: - CONFIG_ENV_SIZE: |
c609719b8 Initial revision |
2994 |
|
11ccc33fa Many spelling fix... |
2995 |
These two #defines are used to determine the memory area you |
c609719b8 Initial revision |
2996 2997 2998 2999 3000 3001 |
want to use for environment. It is assumed that this memory can just be read and written to, without any special provision. BE CAREFUL! The first access to the environment happens quite early in U-Boot initalization (when we try to get the setting of for the |
11ccc33fa Many spelling fix... |
3002 |
console baudrate). You *MUST* have mapped your NVRAM area then, or |
c609719b8 Initial revision |
3003 3004 3005 3006 3007 3008 |
U-Boot will hang. Please note that even with NVRAM we still use a copy of the environment in RAM: we could work on NVRAM directly, but we want to keep settings there always unmodified except somebody uses "saveenv" to save the current settings. |
bb1f8b4f8 rename CFG_ENV_IS... |
3009 |
- CONFIG_ENV_IS_IN_EEPROM: |
c609719b8 Initial revision |
3010 3011 3012 |
Use this if you have an EEPROM or similar serial access device and a driver for it. |
0e8d15866 rename CFG_ENV ma... |
3013 3014 |
- CONFIG_ENV_OFFSET: - CONFIG_ENV_SIZE: |
c609719b8 Initial revision |
3015 3016 3017 |
These two #defines specify the offset and size of the environment area within the total memory of your EEPROM. |
6d0f6bcf3 rename CFG_ macro... |
3018 |
- CONFIG_SYS_I2C_EEPROM_ADDR: |
c609719b8 Initial revision |
3019 3020 |
If defined, specified the chip address of the EEPROM device. The default address is zero. |
6d0f6bcf3 rename CFG_ macro... |
3021 |
- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: |
c609719b8 Initial revision |
3022 3023 3024 |
If defined, the number of bits used to address bytes in a single page in the EEPROM device. A 64 byte page, for example would require six bits. |
6d0f6bcf3 rename CFG_ macro... |
3025 |
- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: |
c609719b8 Initial revision |
3026 |
If defined, the number of milliseconds to delay between |
ba56f6257 Patch by Travis S... |
3027 |
page writes. The default is zero milliseconds. |
c609719b8 Initial revision |
3028 |
|
6d0f6bcf3 rename CFG_ macro... |
3029 |
- CONFIG_SYS_I2C_EEPROM_ADDR_LEN: |
c609719b8 Initial revision |
3030 3031 |
The length in bytes of the EEPROM memory array address. Note that this is NOT the chip address length! |
6d0f6bcf3 rename CFG_ macro... |
3032 |
- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: |
5cf91d6bd * Modify KUP4X bo... |
3033 3034 3035 3036 3037 3038 3039 3040 3041 |
EEPROM chips that implement "address overflow" are ones like Catalyst 24WC04/08/16 which has 9/10/11 bits of address and the extra bits end up in the "chip address" bit slots. This makes a 24WC08 (1Kbyte) chip look like four 256 byte chips. Note that we consider the length of the address field to still be one byte because the extra address bits are hidden in the chip address. |
6d0f6bcf3 rename CFG_ macro... |
3042 |
- CONFIG_SYS_EEPROM_SIZE: |
c609719b8 Initial revision |
3043 |
The size in bytes of the EEPROM device. |
548738b4d cmd_eeprom: I2C u... |
3044 3045 3046 3047 3048 3049 3050 3051 |
- CONFIG_ENV_EEPROM_IS_ON_I2C define this, if you have I2C and SPI activated, and your EEPROM, which holds the environment, is on the I2C bus. - CONFIG_I2C_ENV_EEPROM_BUS if you have an Environment on an EEPROM reached over I2C muxes, you can define here, how to reach this EEPROM. For example: |
a9046b9e1 Prepare v2010-rc2 |
3052 |
#define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0" |
548738b4d cmd_eeprom: I2C u... |
3053 3054 3055 |
EEPROM which holds the environment, is reached over a pca9547 i2c mux with address 0x70, channel 3. |
c609719b8 Initial revision |
3056 |
|
057c849c4 rename CFG_ENV_IS... |
3057 |
- CONFIG_ENV_IS_IN_DATAFLASH: |
5779d8d98 * Patch by Nicola... |
3058 |
|
d4ca31c40 * Cleanup lowboot... |
3059 |
Define this if you have a DataFlash memory device which you |
5779d8d98 * Patch by Nicola... |
3060 |
want to use for the environment. |
0e8d15866 rename CFG_ENV ma... |
3061 3062 3063 |
- CONFIG_ENV_OFFSET: - CONFIG_ENV_ADDR: - CONFIG_ENV_SIZE: |
5779d8d98 * Patch by Nicola... |
3064 3065 3066 3067 |
These three #defines specify the offset and size of the environment area within the total memory of your DataFlash placed at the specified address. |
0a85a9e70 powerpc/corenet_d... |
3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 |
- CONFIG_ENV_IS_IN_REMOTE: Define this if you have a remote memory space which you want to use for the local device's environment. - CONFIG_ENV_ADDR: - CONFIG_ENV_SIZE: These two #defines specify the address and size of the environment area within the remote memory space. The local device can get the environment from remote memory |
fc54c7fa0 powerpc/corenet_d... |
3079 |
space by SRIO or PCIE links. |
0a85a9e70 powerpc/corenet_d... |
3080 3081 3082 |
BE CAREFUL! For some special cases, the local device can not use "saveenv" command. For example, the local device will get the |
fc54c7fa0 powerpc/corenet_d... |
3083 3084 |
environment stored in a remote NOR flash by SRIO or PCIE link, but it can not erase, write this NOR flash by SRIO or PCIE interface. |
0a85a9e70 powerpc/corenet_d... |
3085 |
|
51bfee192 rename CFG_ENV_IS... |
3086 |
- CONFIG_ENV_IS_IN_NAND: |
13a5695b7 Patch by Jian Zha... |
3087 3088 3089 |
Define this if you have a NAND device which you want to use for the environment. |
0e8d15866 rename CFG_ENV ma... |
3090 3091 |
- CONFIG_ENV_OFFSET: - CONFIG_ENV_SIZE: |
13a5695b7 Patch by Jian Zha... |
3092 3093 |
These two #defines specify the offset and size of the environment |
fdd813def README: Add new N... |
3094 3095 |
area within the first NAND device. CONFIG_ENV_OFFSET must be aligned to an erase block boundary. |
5779d8d98 * Patch by Nicola... |
3096 |
|
fdd813def README: Add new N... |
3097 |
- CONFIG_ENV_OFFSET_REDUND (optional): |
e443c944c Support for redun... |
3098 |
|
0e8d15866 rename CFG_ENV ma... |
3099 |
This setting describes a second storage area of CONFIG_ENV_SIZE |
fdd813def README: Add new N... |
3100 3101 |
size used to hold a redundant copy of the environment data, so that there is a valid backup copy in case there is a power failure |
c0f40859f README: white-spa... |
3102 |
during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be |
fdd813def README: Add new N... |
3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 |
aligned to an erase block boundary. - CONFIG_ENV_RANGE (optional): Specifies the length of the region in which the environment can be written. This should be a multiple of the NAND device's block size. Specifying a range with more erase blocks than are needed to hold CONFIG_ENV_SIZE allows bad blocks within the range to be avoided. - CONFIG_ENV_OFFSET_OOB (optional): Enables support for dynamically retrieving the offset of the environment from block zero's out-of-band data. The "nand env.oob" command can be used to record this offset. Currently, CONFIG_ENV_OFFSET_REDUND is not supported when using CONFIG_ENV_OFFSET_OOB. |
e443c944c Support for redun... |
3120 |
|
b74ab7373 nand_spl: read en... |
3121 3122 3123 3124 3125 |
- CONFIG_NAND_ENV_DST Defines address in RAM to which the nand_spl code should copy the environment. If redundant environment is used, it will be copied to CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. |
6d0f6bcf3 rename CFG_ macro... |
3126 |
- CONFIG_SYS_SPI_INIT_OFFSET |
c609719b8 Initial revision |
3127 3128 3129 3130 3131 3132 3133 3134 |
Defines offset to the initial SPI buffer area in DPRAM. The area is used at an early stage (ROM part) if the environment is configured to reside in the SPI EEPROM: We need a 520 byte scratch DPRAM area. It is used between the two initialization calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems to be a good choice since it makes it far enough from the start of the data area as well as from the stack pointer. |
e881cb563 fix wording in RE... |
3135 |
Please note that the environment is read-only until the monitor |
c609719b8 Initial revision |
3136 |
has been relocated to RAM and a RAM copy of the environment has been |
cdb749778 Rename getenv_r()... |
3137 |
created; also, when using EEPROM you will have to use getenv_f() |
c609719b8 Initial revision |
3138 |
until then to read environment variables. |
85ec0bcc1 * Patch by Arun D... |
3139 3140 3141 3142 3143 3144 |
The environment is protected by a CRC32 checksum. Before the monitor is relocated into RAM, as a result of a bad CRC you will be working with the compiled-in default environment - *silently*!!! [This is necessary, because the first environment variable we need is the "baudrate" setting for the console - if we have a bad CRC, we don't have any device yet where we could complain.] |
c609719b8 Initial revision |
3145 3146 3147 |
Note: once the monitor has been relocated, then it will complain if the default environment is used; a new CRC is computed as soon as you |
85ec0bcc1 * Patch by Arun D... |
3148 |
use the "saveenv" command to store a valid environment. |
c609719b8 Initial revision |
3149 |
|
6d0f6bcf3 rename CFG_ macro... |
3150 |
- CONFIG_SYS_FAULT_ECHO_LINK_DOWN: |
42d1f0394 * Patches by Xian... |
3151 |
Echo the inverted Ethernet link state to the fault LED. |
fc3e2165e * Patch by Sangmo... |
3152 |
|
6d0f6bcf3 rename CFG_ macro... |
3153 |
Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR |
fc3e2165e * Patch by Sangmo... |
3154 |
also needs to be defined. |
6d0f6bcf3 rename CFG_ macro... |
3155 |
- CONFIG_SYS_FAULT_MII_ADDR: |
42d1f0394 * Patches by Xian... |
3156 |
MII address of the PHY to check for the Ethernet link state. |
c609719b8 Initial revision |
3157 |
|
f5675aa5c Create configurat... |
3158 3159 3160 3161 3162 3163 |
- CONFIG_NS16550_MIN_FUNCTIONS: Define this if you desire to only have use of the NS16550_init and NS16550_putc functions for the serial driver located at drivers/serial/ns16550.c. This option is useful for saving space for already greatly restricted images, including but not limited to NAND_SPL configurations. |
c609719b8 Initial revision |
3164 |
Low Level (hardware related) configuration options: |
dc7c9a1a5 * Patch by Rick B... |
3165 |
--------------------------------------------------- |
c609719b8 Initial revision |
3166 |
|
6d0f6bcf3 rename CFG_ macro... |
3167 |
- CONFIG_SYS_CACHELINE_SIZE: |
c609719b8 Initial revision |
3168 |
Cache Line Size of the CPU. |
6d0f6bcf3 rename CFG_ macro... |
3169 |
- CONFIG_SYS_DEFAULT_IMMR: |
c609719b8 Initial revision |
3170 |
Default address of the IMMR after system reset. |
2535d6027 * Patch by Martin... |
3171 |
|
42d1f0394 * Patches by Xian... |
3172 3173 3174 |
Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, and RPXsuper) to be able to adjust the position of the IMMR register after a reset. |
c609719b8 Initial revision |
3175 |
|
e46fedfeb powerpc/85xx: int... |
3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 |
- CONFIG_SYS_CCSRBAR_DEFAULT: Default (power-on reset) physical address of CCSR on Freescale PowerPC SOCs. - CONFIG_SYS_CCSRBAR: Virtual address of CCSR. On a 32-bit build, this is typically the same value as CONFIG_SYS_CCSRBAR_DEFAULT. CONFIG_SYS_DEFAULT_IMMR must also be set to this value, for cross-platform code that uses that macro instead. - CONFIG_SYS_CCSRBAR_PHYS: Physical address of CCSR. CCSR can be relocated to a new physical address, if desired. In this case, this macro should |
c0f40859f README: white-spa... |
3190 |
be set to that address. Otherwise, it should be set to the |
e46fedfeb powerpc/85xx: int... |
3191 3192 3193 3194 3195 3196 3197 3198 |
same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR is typically relocated on 36-bit builds. It is recommended that this macro be defined via the _HIGH and _LOW macros: #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) - CONFIG_SYS_CCSRBAR_PHYS_HIGH: |
4cf2609b0 README: fix docum... |
3199 3200 |
Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically either 0 (32-bit build) or 0xF (36-bit build). This macro is |
e46fedfeb powerpc/85xx: int... |
3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 |
used in assembly code, so it must not contain typecasts or integer size suffixes (e.g. "ULL"). - CONFIG_SYS_CCSRBAR_PHYS_LOW: Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is used in assembly code, so it must not contain typecasts or integer size suffixes (e.g. "ULL"). - CONFIG_SYS_CCSR_DO_NOT_RELOCATE: If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be forced to a value that ensures that CCSR is not relocated. |
7f6c2cbc2 * Vince Husovsky,... |
3212 |
- Floppy Disk Support: |
6d0f6bcf3 rename CFG_ macro... |
3213 |
CONFIG_SYS_FDC_DRIVE_NUMBER |
7f6c2cbc2 * Vince Husovsky,... |
3214 3215 |
the default drive number (default value 0) |
6d0f6bcf3 rename CFG_ macro... |
3216 |
CONFIG_SYS_ISA_IO_STRIDE |
7f6c2cbc2 * Vince Husovsky,... |
3217 |
|
11ccc33fa Many spelling fix... |
3218 |
defines the spacing between FDC chipset registers |
7f6c2cbc2 * Vince Husovsky,... |
3219 |
(default value 1) |
6d0f6bcf3 rename CFG_ macro... |
3220 |
CONFIG_SYS_ISA_IO_OFFSET |
7f6c2cbc2 * Vince Husovsky,... |
3221 |
|
43d9616cf * Patch by Robert... |
3222 3223 |
defines the offset of register from address. It depends on which part of the data bus is connected to |
11ccc33fa Many spelling fix... |
3224 |
the FDC chipset. (default value 0) |
7f6c2cbc2 * Vince Husovsky,... |
3225 |
|
6d0f6bcf3 rename CFG_ macro... |
3226 3227 |
If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their |
43d9616cf * Patch by Robert... |
3228 |
default value. |
7f6c2cbc2 * Vince Husovsky,... |
3229 |
|
6d0f6bcf3 rename CFG_ macro... |
3230 |
if CONFIG_SYS_FDC_HW_INIT is defined, then the function |
43d9616cf * Patch by Robert... |
3231 3232 3233 3234 |
fdc_hw_init() is called at the beginning of the FDC setup. fdc_hw_init() must be provided by the board source code. It is used to make hardware dependant initializations. |
7f6c2cbc2 * Vince Husovsky,... |
3235 |
|
0abddf82d cmd_ide: enhance ... |
3236 3237 3238 3239 3240 3241 3242 |
- CONFIG_IDE_AHB: Most IDE controllers were designed to be connected with PCI interface. Only few of them were designed for AHB interface. When software is doing ATA command and data transfer to IDE devices through IDE-AHB controller, some additional registers accessing to these kind of IDE-AHB controller is requierd. |
6d0f6bcf3 rename CFG_ macro... |
3243 |
- CONFIG_SYS_IMMR: Physical address of the Internal Memory. |
efe2a4d5c Code cleanup. |
3244 |
DO NOT CHANGE unless you know exactly what you're |
25d6712a8 * Clean up CMC PU... |
3245 |
doing! (11-4) [MPC8xx/82xx systems only] |
c609719b8 Initial revision |
3246 |
|
6d0f6bcf3 rename CFG_ macro... |
3247 |
- CONFIG_SYS_INIT_RAM_ADDR: |
c609719b8 Initial revision |
3248 |
|
7152b1d0b * Add support for... |
3249 |
Start address of memory area that can be used for |
c609719b8 Initial revision |
3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 |
initial data and stack; please note that this must be writable memory that is working WITHOUT special initialization, i. e. you CANNOT use normal RAM which will become available only after programming the memory controller and running certain initialization sequences. U-Boot uses the following memory types: - MPC8xx and MPC8260: IMMR (internal memory of the CPU) - MPC824X: data cache - PPC4xx: data cache |
6d0f6bcf3 rename CFG_ macro... |
3261 |
- CONFIG_SYS_GBL_DATA_OFFSET: |
c609719b8 Initial revision |
3262 3263 |
Offset of the initial data structure in the memory |
6d0f6bcf3 rename CFG_ macro... |
3264 3265 |
area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial |
c609719b8 Initial revision |
3266 |
data is located at the end of the available space |
553f09823 Rename CONFIG_SYS... |
3267 |
(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - |
6d0f6bcf3 rename CFG_ macro... |
3268 3269 3270 |
CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET) downward. |
c609719b8 Initial revision |
3271 3272 3273 3274 |
Note: On the MPC824X (or other systems that use the data cache for initial memory) the address chosen for |
6d0f6bcf3 rename CFG_ macro... |
3275 |
CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must |
c609719b8 Initial revision |
3276 3277 |
point to an otherwise UNUSED address space between the top of RAM and the start of the PCI space. |
6d0f6bcf3 rename CFG_ macro... |
3278 |
- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6) |
c609719b8 Initial revision |
3279 |
|
6d0f6bcf3 rename CFG_ macro... |
3280 |
- CONFIG_SYS_SYPCR: System Protection Control (11-9) |
c609719b8 Initial revision |
3281 |
|
6d0f6bcf3 rename CFG_ macro... |
3282 |
- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26) |
c609719b8 Initial revision |
3283 |
|
6d0f6bcf3 rename CFG_ macro... |
3284 |
- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31) |
c609719b8 Initial revision |
3285 |
|
6d0f6bcf3 rename CFG_ macro... |
3286 |
- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) |
c609719b8 Initial revision |
3287 |
|
6d0f6bcf3 rename CFG_ macro... |
3288 |
- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) |
c609719b8 Initial revision |
3289 |
|
6d0f6bcf3 rename CFG_ macro... |
3290 |
- CONFIG_SYS_OR_TIMING_SDRAM: |
c609719b8 Initial revision |
3291 |
SDRAM timing |
6d0f6bcf3 rename CFG_ macro... |
3292 |
- CONFIG_SYS_MAMR_PTA: |
c609719b8 Initial revision |
3293 |
periodic timer for refresh |
6d0f6bcf3 rename CFG_ macro... |
3294 |
- CONFIG_SYS_DER: Debug Event Register (37-47) |
c609719b8 Initial revision |
3295 |
|
6d0f6bcf3 rename CFG_ macro... |
3296 3297 3298 3299 |
- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, CONFIG_SYS_BR1_PRELIM: |
c609719b8 Initial revision |
3300 3301 3302 |
Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, |
6d0f6bcf3 rename CFG_ macro... |
3303 3304 |
CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: |
c609719b8 Initial revision |
3305 |
Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) |
6d0f6bcf3 rename CFG_ macro... |
3306 3307 |
- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K, CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL: |
c609719b8 Initial revision |
3308 3309 |
Machine Mode Register and Memory Periodic Timer Prescaler definitions (SDRAM timing) |
6d0f6bcf3 rename CFG_ macro... |
3310 |
- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]: |
c609719b8 Initial revision |
3311 3312 |
enable I2C microcode relocation patch (MPC8xx); define relocation offset in DPRAM [DSP2] |
6d0f6bcf3 rename CFG_ macro... |
3313 |
- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]: |
b423d055c Enable SMC microc... |
3314 3315 |
enable SMC microcode relocation patch (MPC8xx); define relocation offset in DPRAM [SMC1] |
6d0f6bcf3 rename CFG_ macro... |
3316 |
- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]: |
c609719b8 Initial revision |
3317 3318 |
enable SPI microcode relocation patch (MPC8xx); define relocation offset in DPRAM [SCC4] |
6d0f6bcf3 rename CFG_ macro... |
3319 |
- CONFIG_SYS_USE_OSCCLK: |
c609719b8 Initial revision |
3320 3321 3322 |
Use OSCM clock mode on MBX8xx board. Be careful, wrong setting might damage your board. Read doc/README.MBX before setting this variable! |
6d0f6bcf3 rename CFG_ macro... |
3323 |
- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) |
43d9616cf * Patch by Robert... |
3324 3325 3326 3327 |
Offset of the bootmode word in DPRAM used by post (Power On Self Tests). This definition overrides #define'd default value in commproc.h resp. cpm_8260.h. |
ea909b760 * Added support f... |
3328 |
|
6d0f6bcf3 rename CFG_ macro... |
3329 3330 3331 3332 3333 3334 3335 3336 |
- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL, CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS, CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL, CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE, CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only) |
a47a12bec Move arch/ppc to ... |
3337 |
Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set. |
5d232d0e7 * Patch by Dave E... |
3338 |
|
9cacf4fc4 ppc4xx: Add READM... |
3339 3340 3341 |
- CONFIG_PCI_DISABLE_PCIE: Disable PCI-Express on systems where it is supported but not required. |
69fd2d3b0 pci: add CONFIG_P... |
3342 3343 3344 3345 3346 3347 |
- CONFIG_PCI_ENUM_ONLY Only scan through and get the devices on the busses. Don't do any setup work, presumably because someone or something has already done it, and we don't need to do it a second time. Useful for platforms that are pre-booted by coreboot or similar. |
a09b9b68d powerpc/8xxx: Ref... |
3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 |
- CONFIG_SYS_SRIO: Chip has SRIO or not - CONFIG_SRIO1: Board has SRIO 1 port available - CONFIG_SRIO2: Board has SRIO 2 port available - CONFIG_SYS_SRIOn_MEM_VIRT: Virtual Address of SRIO port 'n' memory region - CONFIG_SYS_SRIOn_MEM_PHYS: Physical Address of SRIO port 'n' memory region - CONFIG_SYS_SRIOn_MEM_SIZE: Size of SRIO port 'n' memory region |
eced4626e NAND: Add 16bit N... |
3365 3366 3367 3368 3369 3370 3371 |
- CONFIG_SYS_NDFC_16 Defined to tell the NDFC that the NAND chip is using a 16 bit bus. - CONFIG_SYS_NDFC_EBC0_CFG Sets the EBC0_CFG register for the NDFC. If not defined a default value will be used. |
bb99ad6d8 Add support for m... |
3372 |
- CONFIG_SPD_EEPROM |
218ca724c README: update do... |
3373 3374 |
Get DDR timing information from an I2C EEPROM. Common with pluggable memory modules such as SODIMMs |
bb99ad6d8 Add support for m... |
3375 3376 |
SPD_EEPROM_ADDRESS I2C address of the SPD EEPROM |
6d0f6bcf3 rename CFG_ macro... |
3377 |
- CONFIG_SYS_SPD_BUS_NUM |
218ca724c README: update do... |
3378 3379 3380 |
If SPD EEPROM is on an I2C bus other than the first one, specify here. Note that the value must resolve to something your driver can deal with. |
bb99ad6d8 Add support for m... |
3381 |
|
1b3e3c4f2 powerpc/mpc8xxx: ... |
3382 3383 3384 3385 3386 |
- CONFIG_SYS_DDR_RAW_TIMING Get DDR timing information from other than SPD. Common with soldered DDR chips onboard without SPD. DDR raw timing parameters are extracted from datasheet and hard-coded into header files or board specific files. |
6f5e1dc53 powerpc/8xxx: Add... |
3387 3388 |
- CONFIG_FSL_DDR_INTERACTIVE Enable interactive DDR debugging. See doc/README.fsl-ddr. |
6d0f6bcf3 rename CFG_ macro... |
3389 |
- CONFIG_SYS_83XX_DDR_USES_CS0 |
218ca724c README: update do... |
3390 3391 |
Only for 83xx systems. If specified, then DDR should be configured using CS0 and CS1 instead of CS2 and CS3. |
2ad6b513b mpc83xx: Add supp... |
3392 |
|
c26e454df Patches by Pantel... |
3393 3394 3395 3396 3397 |
- CONFIG_ETHER_ON_FEC[12] Define to enable FEC[12] on a 8xx series processor. - CONFIG_FEC[12]_PHY Define to the hardcoded PHY address which corresponds |
6e5923851 * Cleanup, minor ... |
3398 3399 |
to the given FEC; i. e. #define CONFIG_FEC1_PHY 4 |
c26e454df Patches by Pantel... |
3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 |
means that the PHY with address 4 is connected to FEC1 When set to -1, means to probe for first available. - CONFIG_FEC[12]_PHY_NORXERR The PHY does not have a RXERR line (RMII only). (so program the FEC to ignore it). - CONFIG_RMII Enable RMII mode for all FECs. Note that this is a global option, we can't have one FEC in standard MII mode and another in RMII mode. |
5cf91d6bd * Modify KUP4X bo... |
3412 3413 3414 3415 3416 3417 3418 3419 3420 |
- CONFIG_CRC32_VERIFY Add a verify option to the crc32 command. The syntax is: => crc32 -v <address> <count> <crc32> Where address/count indicate a memory area and crc32 is the correct crc32 which the area should have. |
56523f128 * Patch by Martin... |
3421 3422 |
- CONFIG_LOOPW Add the "loopw" memory command. This only takes effect if |
602ad3b33 README: Rewrite c... |
3423 |
the memory commands are activated globally (CONFIG_CMD_MEM). |
56523f128 * Patch by Martin... |
3424 |
|
7b4666414 CONFIG_MX_CYCLIC ... |
3425 3426 3427 3428 |
- CONFIG_MX_CYCLIC Add the "mdc" and "mwc" memory commands. These are cyclic "md/mw" commands. Examples: |
efe2a4d5c Code cleanup. |
3429 |
=> mdc.b 10 4 500 |
7b4666414 CONFIG_MX_CYCLIC ... |
3430 |
This command will print 4 bytes (10,11,12,13) each 500 ms. |
efe2a4d5c Code cleanup. |
3431 |
=> mwc.l 100 12345678 10 |
7b4666414 CONFIG_MX_CYCLIC ... |
3432 |
This command will write 12345678 to address 100 all 10 ms. |
efe2a4d5c Code cleanup. |
3433 |
This only takes effect if the memory commands are activated |
602ad3b33 README: Rewrite c... |
3434 |
globally (CONFIG_CMD_MEM). |
7b4666414 CONFIG_MX_CYCLIC ... |
3435 |
|
8aa1a2d11 Patch by Steven S... |
3436 |
- CONFIG_SKIP_LOWLEVEL_INIT |
afc1ce828 doc/README: docum... |
3437 |
[ARM, NDS32, MIPS only] If this variable is defined, then certain |
844f07d8a Coding Style (whi... |
3438 3439 3440 3441 3442 3443 3444 3445 |
low level initializations (like setting up the memory controller) are omitted and/or U-Boot does not relocate itself into RAM. Normally this variable MUST NOT be defined. The only exception is when U-Boot is loaded (to RAM) by some other boot loader or by a debugger which performs these initializations itself. |
8aa1a2d11 Patch by Steven S... |
3446 |
|
401bb30b6 replace CONFIG_PR... |
3447 |
- CONFIG_SPL_BUILD |
df81238b3 ARM1136: Introduc... |
3448 3449 3450 |
Modifies the behaviour of start.S when compiling a loader that is executed before the actual U-Boot. E.g. when compiling a NAND SPL. |
400558b56 Prepare for SoC r... |
3451 |
|
d8834a132 arm: Use optimize... |
3452 3453 3454 3455 3456 |
- CONFIG_USE_ARCH_MEMCPY CONFIG_USE_ARCH_MEMSET If these options are used a optimized version of memcpy/memset will be used if available. These functions may be faster under some conditions but may increase the binary size. |
b16f521a5 x86: Allow exclud... |
3457 3458 3459 |
- CONFIG_X86_NO_RESET_VECTOR If defined, the x86 reset vector code is excluded. You will need to do this when U-Boot is running from Coreboot. |
5b5ece9ef x86: Allow compil... |
3460 3461 3462 3463 |
- CONFIG_X86_NO_REAL_MODE If defined, x86 real mode code is omitted. This assumes a 32-bit environment where such code is not needed. You will need to do this when U-Boot is running from Coreboot. |
f2717b47e powerpc/85xx: cle... |
3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 |
Freescale QE/FMAN Firmware Support: ----------------------------------- The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the loading of "firmware", which is encoded in the QE firmware binary format. This firmware often needs to be loaded during U-Boot booting, so macros are used to identify the storage device (NOR flash, SPI, etc) and the address within that device. - CONFIG_SYS_QE_FMAN_FW_ADDR The address in the storage device where the firmware is located. The meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro is also specified. - CONFIG_SYS_QE_FMAN_FW_LENGTH The maximum possible size of the firmware. The firmware binary format has a field that specifies the actual size of the firmware, but it might not be possible to read any part of the firmware unless some local storage is allocated to hold the entire firmware first. - CONFIG_SYS_QE_FMAN_FW_IN_NOR Specifies that QE/FMAN firmware is located in NOR flash, mapped as normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the virtual address in NOR flash. - CONFIG_SYS_QE_FMAN_FW_IN_NAND Specifies that QE/FMAN firmware is located in NAND flash. CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash. - CONFIG_SYS_QE_FMAN_FW_IN_MMC Specifies that QE/FMAN firmware is located on the primary SD/MMC device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. - CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH Specifies that QE/FMAN firmware is located on the primary SPI device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. |
292dc6c50 powerpc/corenet_d... |
3500 3501 3502 |
- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE Specifies that QE/FMAN firmware is located in the remote (master) memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which |
fc54c7fa0 powerpc/corenet_d... |
3503 3504 3505 |
can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound window->master inbound window->master LAW->the ucode address in master's memory space. |
f2717b47e powerpc/85xx: cle... |
3506 |
|
c609719b8 Initial revision |
3507 3508 |
Building the Software: ====================== |
218ca724c README: update do... |
3509 3510 3511 3512 3513 3514 |
Building U-Boot has been tested in several native build environments and in many different cross environments. Of course we cannot support all possibly existing versions of cross development tools in all (potentially obsolete) versions. In case of tool chain problems we recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) which is extensively used to build and test U-Boot. |
c609719b8 Initial revision |
3515 |
|
218ca724c README: update do... |
3516 3517 3518 3519 3520 |
If you are not using a native environment, it is assumed that you have GNU cross compiling tools available in your path. In this case, you must set the environment variable CROSS_COMPILE in your shell. Note that no changes to the Makefile or any other source files are necessary. For example using the ELDK on a 4xx CPU, please enter: |
c609719b8 Initial revision |
3521 |
|
218ca724c README: update do... |
3522 3523 |
$ CROSS_COMPILE=ppc_4xx- $ export CROSS_COMPILE |
c609719b8 Initial revision |
3524 |
|
2f8d396b9 Add support for b... |
3525 3526 3527 3528 3529 3530 3531 3532 3533 |
Note: If you wish to generate Windows versions of the utilities in the tools directory you can use the MinGW toolchain (http://www.mingw.org). Set your HOST tools to the MinGW toolchain and execute 'make tools'. For example: $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools Binaries such as tools/mkimage.exe will be created which can be executed on computers running Windows. |
218ca724c README: update do... |
3534 3535 |
U-Boot is intended to be simple to build. After installing the sources you must configure U-Boot for one specific board type. This |
c609719b8 Initial revision |
3536 3537 3538 |
is done by typing: make NAME_config |
218ca724c README: update do... |
3539 |
where "NAME_config" is the name of one of the existing configu- |
4d675ae6e README: supported... |
3540 |
rations; see boards.cfg for supported names. |
db01a2ea9 * Patch by Stephe... |
3541 |
|
2729af9d5 * Fix minor NAND ... |
3542 3543 3544 3545 |
Note: for some board special configuration names may exist; check if additional information is available from the board vendor; for instance, the TQM823L systems are available without (standard) or with LCD support. You can select such additional "features" |
11ccc33fa Many spelling fix... |
3546 |
when choosing the configuration, i. e. |
2729af9d5 * Fix minor NAND ... |
3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 |
make TQM823L_config - will configure for a plain TQM823L, i. e. no LCD support make TQM823L_LCD_config - will configure for a TQM823L with U-Boot console on LCD etc. Finally, type "make all", and you should get some working U-Boot images ready for download to / installation on your system: - "u-boot.bin" is a raw binary image - "u-boot" is an image in ELF binary format - "u-boot.srec" is in Motorola S-Record format |
baf312495 Add documentation... |
3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 |
By default the build is performed locally and the objects are saved in the source directory. One of the two methods can be used to change this behavior and build U-Boot to some external directory: 1. Add O= to the make command line invocations: make O=/tmp/build distclean make O=/tmp/build NAME_config make O=/tmp/build all 2. Set environment variable BUILD_DIR to point to the desired location: export BUILD_DIR=/tmp/build make distclean make NAME_config make all Note that the command line "O=" setting overrides the BUILD_DIR environment variable. |
2729af9d5 * Fix minor NAND ... |
3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 |
Please be aware that the Makefiles assume you are using GNU make, so for instance on NetBSD you might need to use "gmake" instead of native "make". If the system board that you have is not listed, then you will need to port U-Boot to your hardware platform. To do this, follow these steps: 1. Add a new configuration option for your board to the toplevel |
4d675ae6e README: supported... |
3593 3594 |
"boards.cfg" file, using the existing entries as examples. Follow the instructions there to keep the boards in order. |
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3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 |
2. Create a new directory to hold your board specific code. Add any files you need. In your board directory, you will need at least the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 3. Create a new configuration file "include/configs/<board>.h" for your board 3. If you're porting U-Boot to a new CPU, then also create a new directory to hold your CPU specific code. Add any files you need. 4. Run "make <board>_config" with your new name. 5. Type "make", and you should get a working "u-boot.srec" file to be installed on your target system. 6. Debug and solve any problems that might arise. [Of course, this last step is much harder than it sounds.] Testing of U-Boot Modifications, Ports to New Hardware, etc.: ============================================================== |
218ca724c README: update do... |
3611 3612 |
If you have modified U-Boot sources (for instance added a new board or support for new devices, a new CPU, etc.) you are expected to |
2729af9d5 * Fix minor NAND ... |
3613 3614 |
provide feedback to the other developers. The feedback normally takes the form of a "patch", i. e. a context diff against a certain (latest |
218ca724c README: update do... |
3615 |
official or latest in the git repository) version of U-Boot sources. |
2729af9d5 * Fix minor NAND ... |
3616 |
|
218ca724c README: update do... |
3617 3618 |
But before you submit such a patch, please verify that your modifi- cation did not break existing code. At least make sure that *ALL* of |
2729af9d5 * Fix minor NAND ... |
3619 3620 |
the supported boards compile WITHOUT ANY compiler warnings. To do so, just run the "MAKEALL" script, which will configure and build U-Boot |
218ca724c README: update do... |
3621 3622 3623 3624 |
for ALL supported system. Be warned, this will take a while. You can select which (cross) compiler to use by passing a `CROSS_COMPILE' environment variable to the script, i. e. to use the ELDK cross tools you can type |
2729af9d5 * Fix minor NAND ... |
3625 3626 3627 3628 3629 3630 |
CROSS_COMPILE=ppc_8xx- MAKEALL or to build on a native PowerPC system you can type CROSS_COMPILE=' ' MAKEALL |
218ca724c README: update do... |
3631 3632 3633 3634 3635 3636 3637 |
When using the MAKEALL script, the default behaviour is to build U-Boot in the source directory. This location can be changed by setting the BUILD_DIR environment variable. Also, for each target built, the MAKEALL script saves two log files (<target>.ERR and <target>.MAKEALL) in the <source dir>/LOG directory. This default location can be changed by setting the MAKEALL_LOGDIR environment variable. For example: |
baf312495 Add documentation... |
3638 3639 3640 3641 |
export BUILD_DIR=/tmp/build export MAKEALL_LOGDIR=/tmp/log CROSS_COMPILE=ppc_8xx- MAKEALL |
218ca724c README: update do... |
3642 3643 3644 |
With the above settings build objects are saved in the /tmp/build, log files are saved in the /tmp/log and the source tree remains clean during the whole build process. |
baf312495 Add documentation... |
3645 |
|
2729af9d5 * Fix minor NAND ... |
3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 |
See also "U-Boot Porting Guide" below. Monitor Commands - Overview: ============================ go - start application at address 'addr' run - run commands in an environment variable bootm - boot application image from memory bootp - boot image via network using BootP/TFTP protocol |
44f074c77 BOOT: Add "bootz"... |
3656 |
bootz - boot zImage from memory |
2729af9d5 * Fix minor NAND ... |
3657 3658 3659 |
tftpboot- boot image via network using TFTP protocol and env variables "ipaddr" and "serverip" (and eventually "gatewayip") |
1fb7cd498 net: tftpput: imp... |
3660 |
tftpput - upload a file via network using TFTP protocol |
2729af9d5 * Fix minor NAND ... |
3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 |
rarpboot- boot image via network using RARP/TFTP protocol diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' loads - load S-Record file over serial line loadb - load binary file over serial line (kermit mode) md - memory display mm - memory modify (auto-incrementing) nm - memory modify (constant address) mw - memory write (fill) cp - memory copy cmp - memory compare crc32 - checksum calculation |
0f89c54be i2c: Update refer... |
3672 |
i2c - I2C sub-system |
2729af9d5 * Fix minor NAND ... |
3673 3674 3675 3676 3677 3678 3679 3680 |
sspi - SPI utility commands base - print or set address offset printenv- print environment variables setenv - set environment variables saveenv - save environment variables to persistent storage protect - enable or disable FLASH write protection erase - erase FLASH memory flinfo - print FLASH memory information |
10635afa5 README: Reference... |
3681 |
nand - NAND memory operations (see doc/README.nand) |
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3682 3683 3684 3685 3686 |
bdinfo - print Board Info structure iminfo - print header information for application image coninfo - print console devices and informations ide - IDE sub-system loop - infinite loop on address range |
56523f128 * Patch by Martin... |
3687 |
loopw - infinite write loop on address range |
2729af9d5 * Fix minor NAND ... |
3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 |
mtest - simple RAM test icache - enable or disable instruction cache dcache - enable or disable data cache reset - Perform RESET of the CPU echo - echo args to console version - print monitor version help - print online help ? - alias for 'help' Monitor Commands - Detailed Description: ======================================== TODO. For now: just type "help <command>". Environment Variables: ====================== U-Boot supports user configuration using Environment Variables which can be made persistent by saving to Flash memory. |
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|
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3712 3713 3714 3715 3716 3717 |
Environment Variables are set using "setenv", printed using "printenv", and saved to Flash using "saveenv". Using "setenv" without a value can be used to delete a variable from the environment. As long as you don't save the environment you are working with an in-memory copy. In case the Flash area containing the environment is erased by accident, a default environment is provided. |
c609719b8 Initial revision |
3718 |
|
c96f86eef TFTP: allow for a... |
3719 3720 3721 |
Some configuration options can be set using Environment Variables. List of environment variables (most likely not complete): |
c609719b8 Initial revision |
3722 |
|
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3723 |
baudrate - see CONFIG_BAUDRATE |
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3724 |
|
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3725 |
bootdelay - see CONFIG_BOOTDELAY |
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3726 |
|
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3727 |
bootcmd - see CONFIG_BOOTCOMMAND |
4a6fd34b2 * Patch by Lutz D... |
3728 |
|
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3729 |
bootargs - Boot arguments when booting an RTOS image |
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3730 |
|
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3731 |
bootfile - Name of the image to load with TFTP |
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3732 |
|
7d721e34a Boot-related docu... |
3733 3734 3735 3736 3737 3738 |
bootm_low - Memory range available for image processing in the bootm command can be restricted. This variable is given as a hexadecimal number and defines lowest address allowed for use by the bootm command. See also "bootm_size" environment variable. Address defined by "bootm_low" is also the base of the initial memory mapping for the Linux |
c3624e6ed Default to bootm_... |
3739 3740 |
kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and bootm_mapsize. |
c0f40859f README: white-spa... |
3741 |
bootm_mapsize - Size of the initial memory mapping for the Linux kernel. |
c3624e6ed Default to bootm_... |
3742 3743 3744 3745 3746 3747 |
This variable is given as a hexadecimal number and it defines the size of the memory region starting at base address bootm_low that is accessible by the Linux kernel during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used as the default value if it is defined, and bootm_size is used otherwise. |
7d721e34a Boot-related docu... |
3748 3749 3750 3751 3752 3753 |
bootm_size - Memory range available for image processing in the bootm command can be restricted. This variable is given as a hexadecimal number and defines the size of the region allowed for use by the bootm command. See also "bootm_low" environment variable. |
4bae90904 Automatic softwar... |
3754 3755 3756 |
updatefile - Location of the software update file on a TFTP server, used by the automatic software update feature. Please refer to documentation in doc/README.update for more details. |
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3757 3758 3759 3760 |
autoload - if set to "no" (any string beginning with 'n'), "bootp" will just load perform a lookup of the configuration from the BOOTP server, but not try to load any image using TFTP |
c609719b8 Initial revision |
3761 |
|
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3762 3763 3764 3765 |
autostart - if set to "yes", an image loaded using the "bootp", "rarpboot", "tftpboot" or "diskboot" commands will be automatically started (by internally calling "bootm") |
38b99261c Add zero-copy ram... |
3766 |
|
2729af9d5 * Fix minor NAND ... |
3767 3768 3769 3770 3771 |
If set to "no", a standalone image passed to the "bootm" command will be copied to the load address (and eventually uncompressed), but NOT be started. This can be used to load and uncompress arbitrary data. |
c609719b8 Initial revision |
3772 |
|
a28afca57 Add uboot "fdt_hi... |
3773 3774 |
fdt_high - if set this restricts the maximum address that the flattened device tree will be copied into upon boot. |
fa34f6b25 common/image.c: a... |
3775 3776 3777 3778 3779 3780 3781 |
For example, if you have a system with 1 GB memory at physical address 0x10000000, while Linux kernel only recognizes the first 704 MB as low memory, you may need to set fdt_high as 0x3C000000 to have the device tree blob be copied to the maximum address of the 704 MB low memory, so that Linux kernel can access it during the boot procedure. |
a28afca57 Add uboot "fdt_hi... |
3782 3783 3784 3785 3786 3787 |
If this is set to the special value 0xFFFFFFFF then the fdt will not be copied at all on boot. For this to work it must reside in writable memory, have sufficient padding on the end of it for u-boot to add the information it needs into it, and the memory must be accessible by the kernel. |
eea63e05d fdt: ARM: Add fdt... |
3788 3789 3790 |
fdtcontroladdr- if set this is the address of the control flattened device tree used by U-Boot when CONFIG_OF_CONTROL is defined. |
17ea11774 Patch by Tolunay ... |
3791 3792 3793 3794 3795 |
i2cfast - (PPC405GP|PPC405EP only) if set to 'y' configures Linux I2C driver for fast mode (400kHZ). This environment variable is used in initialization code. So, for changes to be effective it must be saved and board must be reset. |
2729af9d5 * Fix minor NAND ... |
3796 3797 3798 3799 3800 3801 |
initrd_high - restrict positioning of initrd images: If this variable is not set, initrd images will be copied to the highest possible address in RAM; this is usually what you want since it allows for maximum initrd size. If for some reason you want to make sure that the initrd image is loaded below the |
6d0f6bcf3 rename CFG_ macro... |
3802 |
CONFIG_SYS_BOOTMAPSZ limit, you can set this environment |
2729af9d5 * Fix minor NAND ... |
3803 3804 3805 3806 |
variable to a value of "no" or "off" or "0". Alternatively, you can set it to a maximum upper address to use (U-Boot will still check that it does not overwrite the U-Boot stack and data). |
c609719b8 Initial revision |
3807 |
|
2729af9d5 * Fix minor NAND ... |
3808 3809 3810 3811 3812 3813 |
For instance, when you have a system with 16 MB RAM, and want to reserve 4 MB from use by Linux, you can do this by adding "mem=12M" to the value of the "bootargs" variable. However, now you must make sure that the initrd image is placed in the first 12 MB as well - this can be done with |
c609719b8 Initial revision |
3814 |
|
2729af9d5 * Fix minor NAND ... |
3815 |
setenv initrd_high 00c00000 |
c609719b8 Initial revision |
3816 |
|
2729af9d5 * Fix minor NAND ... |
3817 3818 3819 3820 3821 3822 3823 |
If you set initrd_high to 0xFFFFFFFF, this is an indication to U-Boot that all addresses are legal for the Linux kernel, including addresses in flash memory. In this case U-Boot will NOT COPY the ramdisk at all. This may be useful to reduce the boot time on your system, but requires that this feature is supported by your Linux kernel. |
c609719b8 Initial revision |
3824 |
|
2729af9d5 * Fix minor NAND ... |
3825 |
ipaddr - IP address; needed for tftpboot command |
c609719b8 Initial revision |
3826 |
|
2729af9d5 * Fix minor NAND ... |
3827 3828 |
loadaddr - Default load address for commands like "bootp", "rarpboot", "tftpboot", "loadb" or "diskboot" |
c609719b8 Initial revision |
3829 |
|
2729af9d5 * Fix minor NAND ... |
3830 |
loads_echo - see CONFIG_LOADS_ECHO |
a3d991bd0 Patches by Pantel... |
3831 |
|
2729af9d5 * Fix minor NAND ... |
3832 |
serverip - TFTP server IP address; needed for tftpboot command |
a3d991bd0 Patches by Pantel... |
3833 |
|
2729af9d5 * Fix minor NAND ... |
3834 |
bootretry - see CONFIG_BOOT_RETRY_TIME |
a3d991bd0 Patches by Pantel... |
3835 |
|
2729af9d5 * Fix minor NAND ... |
3836 |
bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR |
a3d991bd0 Patches by Pantel... |
3837 |
|
2729af9d5 * Fix minor NAND ... |
3838 |
bootstopkey - see CONFIG_AUTOBOOT_STOP_STR |
c609719b8 Initial revision |
3839 |
|
e2a53458a net: drop !NET_MU... |
3840 |
ethprime - controls which interface is used first. |
c609719b8 Initial revision |
3841 |
|
e2a53458a net: drop !NET_MU... |
3842 3843 |
ethact - controls which interface is currently active. For example you can do the following |
c609719b8 Initial revision |
3844 |
|
48690d802 net ppc: fix ethe... |
3845 3846 3847 3848 |
=> setenv ethact FEC => ping 192.168.0.1 # traffic sent on FEC => setenv ethact SCC => ping 10.0.0.1 # traffic sent on SCC |
c609719b8 Initial revision |
3849 |
|
e16925773 net: add 'ethrota... |
3850 3851 3852 |
ethrotate - When set to "no" U-Boot does not go through all available network interfaces. It just stays at the currently selected interface. |
c96f86eef TFTP: allow for a... |
3853 |
netretry - When set to "no" each network operation will |
2729af9d5 * Fix minor NAND ... |
3854 3855 3856 3857 3858 3859 |
either succeed or fail without retrying. When set to "once" the network operation will fail when all the available network interfaces are tried once without success. Useful on scripts which control the retry operation themselves. |
c609719b8 Initial revision |
3860 |
|
b4e2f89df ixp: remove the o... |
3861 |
npe_ucode - set load address for the NPE microcode |
a1cf027a0 IXP: add dynamic ... |
3862 |
|
28cb93758 Update for TFTP u... |
3863 |
tftpsrcport - If this is set, the value is used for TFTP's |
ecb0ccd9c Allow to force TF... |
3864 |
UDP source port. |
28cb93758 Update for TFTP u... |
3865 3866 |
tftpdstport - If this is set, the value is used for TFTP's UDP destination port instead of the Well Know Port 69. |
c96f86eef TFTP: allow for a... |
3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 |
tftpblocksize - Block size to use for TFTP transfers; if not set, we use the TFTP server's default block size tftptimeout - Retransmission timeout for TFTP packets (in milli- seconds, minimum value is 1000 = 1 second). Defines when a packet is considered to be lost so it has to be retransmitted. The default is 5000 = 5 seconds. Lowering this value may make downloads succeed faster in networks with high packet loss rates or with unreliable TFTP servers. vlan - When set to a value < 4095 the traffic over |
11ccc33fa Many spelling fix... |
3879 |
Ethernet is encapsulated/received over 802.1q |
2729af9d5 * Fix minor NAND ... |
3880 |
VLAN tagged frames. |
c609719b8 Initial revision |
3881 |
|
dc0b7b0e6 README: document ... |
3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 |
The following image location variables contain the location of images used in booting. The "Image" column gives the role of the image and is not an environment variable name. The other columns are environment variable names. "File Name" gives the name of the file on a TFTP server, "RAM Address" gives the location in RAM the image will be loaded to, and "Flash Location" gives the image's address in NOR flash or offset in NAND flash. *Note* - these variables don't have to be defined for all boards, some boards currenlty use other variables for these purposes, and some boards use these variables for other purposes. |
c0f40859f README: white-spa... |
3893 3894 3895 3896 3897 3898 |
Image File Name RAM Address Flash Location ----- --------- ----------- -------------- u-boot u-boot u-boot_addr_r u-boot_addr Linux kernel bootfile kernel_addr_r kernel_addr device tree blob fdtfile fdt_addr_r fdt_addr ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr |
dc0b7b0e6 README: document ... |
3899 |
|
2729af9d5 * Fix minor NAND ... |
3900 3901 3902 |
The following environment variables may be used and automatically updated by the network boot commands ("bootp" and "rarpboot"), depending the information provided by your boot server: |
c609719b8 Initial revision |
3903 |
|
2729af9d5 * Fix minor NAND ... |
3904 3905 3906 3907 3908 3909 3910 3911 3912 |
bootfile - see above dnsip - IP address of your Domain Name Server dnsip2 - IP address of your secondary Domain Name Server gatewayip - IP address of the Gateway (Router) to use hostname - Target hostname ipaddr - see above netmask - Subnet Mask rootpath - Pathname of the root filesystem on the NFS server serverip - see above |
c1551ea81 U-Boot version en... |
3913 |
|
c1551ea81 U-Boot version en... |
3914 |
|
2729af9d5 * Fix minor NAND ... |
3915 |
There are two special Environment Variables: |
c1551ea81 U-Boot version en... |
3916 |
|
2729af9d5 * Fix minor NAND ... |
3917 3918 3919 |
serial# - contains hardware identification information such as type string and/or serial number ethaddr - Ethernet address |
c609719b8 Initial revision |
3920 |
|
2729af9d5 * Fix minor NAND ... |
3921 3922 3923 |
These variables can be set only once (usually during manufacturing of the board). U-Boot refuses to delete or overwrite these variables once they have been set once. |
c609719b8 Initial revision |
3924 |
|
f07771cc2 * Fix data abort ... |
3925 |
|
2729af9d5 * Fix minor NAND ... |
3926 |
Further special Environment Variables: |
f07771cc2 * Fix data abort ... |
3927 |
|
2729af9d5 * Fix minor NAND ... |
3928 3929 3930 |
ver - Contains the U-Boot version string as printed with the "version" command. This variable is readonly (see CONFIG_VERSION_VARIABLE). |
f07771cc2 * Fix data abort ... |
3931 |
|
f07771cc2 * Fix data abort ... |
3932 |
|
2729af9d5 * Fix minor NAND ... |
3933 3934 |
Please note that changes to some configuration parameters may take only effect after the next boot (yes, that's just like Windoze :-). |
f07771cc2 * Fix data abort ... |
3935 |
|
f07771cc2 * Fix data abort ... |
3936 |
|
170ab1107 env: Add support ... |
3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 |
Callback functions for environment variables: --------------------------------------------- For some environment variables, the behavior of u-boot needs to change when their values are changed. This functionailty allows functions to be associated with arbitrary variables. On creation, overwrite, or deletion, the callback will provide the opportunity for some side effect to happen or for the change to be rejected. The callbacks are named and associated with a function using the U_BOOT_ENV_CALLBACK macro in your board or driver code. These callbacks are associated with variables in one of two ways. The static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC in the board configuration to a string that defines a list of associations. The list must be in the following format: entry = variable_name[:callback_name] list = entry[,list] If the callback name is not specified, then the callback is deleted. Spaces are also allowed anywhere in the list. Callbacks can also be associated by defining the ".callbacks" variable with the same list format above. Any association in ".callbacks" will override any association in the static list. You can define CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the ".callbacks" envirnoment variable in the default or embedded environment. |
2729af9d5 * Fix minor NAND ... |
3965 3966 |
Command Line Parsing: ===================== |
f07771cc2 * Fix data abort ... |
3967 |
|
2729af9d5 * Fix minor NAND ... |
3968 3969 |
There are two different command line parsers available with U-Boot: the old "simple" one, and the much more powerful "hush" shell: |
c609719b8 Initial revision |
3970 |
|
2729af9d5 * Fix minor NAND ... |
3971 3972 |
Old, simple command line parser: -------------------------------- |
c609719b8 Initial revision |
3973 |
|
2729af9d5 * Fix minor NAND ... |
3974 3975 |
- supports environment variables (through setenv / saveenv commands) - several commands on one line, separated by ';' |
fe126d8b3 Change all '$(...... |
3976 |
- variable substitution using "... ${name} ..." syntax |
2729af9d5 * Fix minor NAND ... |
3977 3978 |
- special characters ('$', ';') can be escaped by prefixing with '\', for example: |
fe126d8b3 Change all '$(...... |
3979 |
setenv bootcmd bootm \${address} |
2729af9d5 * Fix minor NAND ... |
3980 3981 |
- You can also escape text by enclosing in single apostrophes, for example: setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' |
c609719b8 Initial revision |
3982 |
|
2729af9d5 * Fix minor NAND ... |
3983 3984 |
Hush shell: ----------- |
c609719b8 Initial revision |
3985 |
|
2729af9d5 * Fix minor NAND ... |
3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 |
- similar to Bourne shell, with control structures like if...then...else...fi, for...do...done; while...do...done, until...do...done, ... - supports environment ("global") variables (through setenv / saveenv commands) and local shell variables (through standard shell syntax "name=value"); only environment variables can be used with "run" command General rules: -------------- |
c609719b8 Initial revision |
3996 |
|
2729af9d5 * Fix minor NAND ... |
3997 3998 3999 4000 |
(1) If a command line (or an environment variable executed by a "run" command) contains several commands separated by semicolon, and one of these commands fails, then the remaining commands will be executed anyway. |
c609719b8 Initial revision |
4001 |
|
2729af9d5 * Fix minor NAND ... |
4002 |
(2) If you execute several variables with one call to run (i. e. |
11ccc33fa Many spelling fix... |
4003 |
calling run with a list of variables as arguments), any failing |
2729af9d5 * Fix minor NAND ... |
4004 4005 |
command will cause "run" to terminate, i. e. the remaining variables are not executed. |
c609719b8 Initial revision |
4006 |
|
2729af9d5 * Fix minor NAND ... |
4007 4008 |
Note for Redundant Ethernet Interfaces: ======================================= |
c609719b8 Initial revision |
4009 |
|
11ccc33fa Many spelling fix... |
4010 |
Some boards come with redundant Ethernet interfaces; U-Boot supports |
2729af9d5 * Fix minor NAND ... |
4011 4012 |
such configurations and is capable of automatic selection of a "working" interface when needed. MAC assignment works as follows: |
c609719b8 Initial revision |
4013 |
|
2729af9d5 * Fix minor NAND ... |
4014 4015 4016 |
Network interfaces are numbered eth0, eth1, eth2, ... Corresponding MAC addresses can be stored in the environment as "ethaddr" (=>eth0), "eth1addr" (=>eth1), "eth2addr", ... |
c609719b8 Initial revision |
4017 |
|
2729af9d5 * Fix minor NAND ... |
4018 4019 4020 4021 |
If the network interface stores some valid MAC address (for instance in SROM), this is used as default address if there is NO correspon- ding setting in the environment; if the corresponding environment variable is set, this overrides the settings in the card; that means: |
c609719b8 Initial revision |
4022 |
|
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o If the SROM has a valid MAC address, and there is no address in the environment, the SROM's address is used. |
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o If there is no valid address in the SROM, and a definition in the environment exists, then the value from the environment variable is used. |
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o If both the SROM and the environment contain a MAC address, and both addresses are the same, this MAC address is used. |
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o If both the SROM and the environment contain a MAC address, and the addresses differ, the value from the environment is used and a warning is printed. |
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o If neither SROM nor the environment contain a MAC address, an error is raised. |
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If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses |
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will be programmed into hardware as part of the initialization process. This |
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may be skipped by setting the appropriate 'ethmacskip' environment variable. The naming convention is as follows: "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. |
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Image Formats: ============== |
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U-Boot is capable of booting (and performing other auxiliary operations on) images in two formats: New uImage format (FIT) ----------------------- Flexible and powerful format based on Flattened Image Tree -- FIT (similar to Flattened Device Tree). It allows the use of images with multiple components (several kernels, ramdisks, etc.), with contents protected by SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. Old uImage format ----------------- Old image format is based on binary files which can be basically anything, preceded by a special header; see the definitions in include/image.h for details; basically, the header defines the following image properties: |
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* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, |
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LynxOS, pSOS, QNX, RTEMS, INTEGRITY; Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, INTEGRITY). |
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* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, |
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IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC). |
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* Compression Type (uncompressed, gzip, bzip2) * Load Address * Entry Point * Image Name * Image Timestamp |
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The header is marked by a special Magic Number, and both the header and the data portions of the image are secured against corruption by CRC32 checksums. |
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Linux Support: ============== |
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Although U-Boot should support any OS or standalone application easily, the main focus has always been on Linux during the design of U-Boot. |
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U-Boot includes many features that so far have been part of some special "boot loader" code within the Linux kernel. Also, any "initrd" images to be used are no longer part of one big Linux image; instead, kernel and "initrd" are separate images. This implementation serves several purposes: |
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- the same features can be used for other OS or standalone applications (for instance: using compressed images to reduce the Flash memory footprint) |
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- it becomes much easier to port new Linux kernel versions because lots of low-level, hardware dependent stuff are done by U-Boot |
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- the same Linux kernel image can now be used with different "initrd" images; of course this also means that different kernel images can be run with the same "initrd". This makes testing easier (you don't have to build a new "zImage.initrd" Linux image when you just change a file in your "initrd"). Also, a field-upgrade of the software is easier now. |
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Linux HOWTO: ============ |
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Porting Linux to U-Boot based systems: --------------------------------------- |
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U-Boot cannot save you from doing all the necessary modifications to configure the Linux device drivers for use with your target hardware (no, we don't intend to provide a full virtual machine interface to Linux :-). |
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But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). |
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Just make sure your machine specific header file (for instance include/asm-ppc/tqm8xx.h) includes the same definition of the Board |
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Information structure as we define in include/asm-<arch>/u-boot.h, and make sure that your definition of IMAP_ADDR uses the same value |
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as your U-Boot configuration in CONFIG_SYS_IMMR. |
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Configuring the Linux kernel: ----------------------------- |
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No specific requirements for U-Boot. Make sure you have some root device (initial ramdisk, NFS) for your target system. Building a Linux Image: ----------------------- |
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With U-Boot, "normal" build targets like "zImage" or "bzImage" are not used. If you use recent kernel source, a new build target "uImage" will exist which automatically builds an image usable by U-Boot. Most older kernels also have support for a "pImage" target, which was introduced for our predecessor project PPCBoot and uses a 100% compatible format. Example: make TQM850L_config make oldconfig make dep make uImage The "uImage" build target uses a special tool (in 'tools/mkimage') to encapsulate a compressed Linux kernel image with header information, CRC32 checksum etc. for use with U-Boot. This is what we are doing: * build a standard "vmlinux" kernel image (in ELF binary format): * convert the kernel into a raw binary image: ${CROSS_COMPILE}-objcopy -O binary \ -R .note -R .comment \ -S vmlinux linux.bin * compress the binary image: gzip -9 linux.bin * package compressed binary image for U-Boot: mkimage -A ppc -O linux -T kernel -C gzip \ -a 0 -e 0 -n "Linux Kernel Image" \ -d linux.bin.gz uImage |
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The "mkimage" tool can also be used to create ramdisk images for use with U-Boot, either separated from the Linux kernel image, or combined into one file. "mkimage" encapsulates the images with a 64 byte header containing information about target architecture, operating system, image type, compression method, entry points, time stamp, CRC32 checksums, etc. "mkimage" can be called in two ways: to verify existing images and print the header information, or to build new images. In the first form (with "-l" option) mkimage lists the information contained in the header of an existing U-Boot image; this includes checksum verification: |
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tools/mkimage -l image -l ==> list image header information The second form (with "-d" option) is used to build a U-Boot image from a "data file" which is used as image payload: tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ -n name -d data_file image -A ==> set architecture to 'arch' -O ==> set operating system to 'os' -T ==> set image type to 'type' -C ==> set compression type 'comp' -a ==> set load address to 'addr' (hex) -e ==> set entry point to 'ep' (hex) -n ==> set image name to 'name' -d ==> use image data from 'datafile' |
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Right now, all Linux kernels for PowerPC systems use the same load address (0x00000000), but the entry point address depends on the kernel version: |
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- 2.2.x kernels have the entry point at 0x0000000C, - 2.3.x and later kernels have the entry point at 0x00000000. So a typical call to build a U-Boot image would read: -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ |
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> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ |
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> examples/uImage.TQM850L Image Name: 2.4.4 kernel for TQM850L Created: Wed Jul 19 02:34:59 2000 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 335725 Bytes = 327.86 kB = 0.32 MB Load Address: 0x00000000 Entry Point: 0x00000000 To verify the contents of the image (or check for corruption): -> tools/mkimage -l examples/uImage.TQM850L Image Name: 2.4.4 kernel for TQM850L Created: Wed Jul 19 02:34:59 2000 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 335725 Bytes = 327.86 kB = 0.32 MB Load Address: 0x00000000 Entry Point: 0x00000000 NOTE: for embedded systems where boot time is critical you can trade speed for memory and install an UNCOMPRESSED image instead: this needs more space in Flash, but boots much faster since it does not need to be uncompressed: |
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-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz |
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-> tools/mkimage -n '2.4.4 kernel for TQM850L' \ > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ |
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> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ |
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> examples/uImage.TQM850L-uncompressed Image Name: 2.4.4 kernel for TQM850L Created: Wed Jul 19 02:34:59 2000 Image Type: PowerPC Linux Kernel Image (uncompressed) Data Size: 792160 Bytes = 773.59 kB = 0.76 MB Load Address: 0x00000000 Entry Point: 0x00000000 Similar you can build U-Boot images from a 'ramdisk.image.gz' file when your kernel is intended to use an initial ramdisk: -> tools/mkimage -n 'Simple Ramdisk Image' \ > -A ppc -O linux -T ramdisk -C gzip \ > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd Image Name: Simple Ramdisk Image Created: Wed Jan 12 14:01:50 2000 Image Type: PowerPC Linux RAMDisk Image (gzip compressed) Data Size: 566530 Bytes = 553.25 kB = 0.54 MB Load Address: 0x00000000 Entry Point: 0x00000000 Installing a Linux Image: ------------------------- To downloading a U-Boot image over the serial (console) interface, you must convert the image to S-Record format: objcopy -I binary -O srec examples/image examples/image.srec The 'objcopy' does not understand the information in the U-Boot image header, so the resulting S-Record file will be relative to address 0x00000000. To load it to a given address, you need to specify the target address as 'offset' parameter with the 'loads' command. Example: install the image to address 0x40100000 (which on the TQM8xxL is in the first Flash bank): => erase 40100000 401FFFFF .......... done Erased 8 sectors => loads 40100000 ## Ready for S-Record download ... ~>examples/image.srec 1 2 3 4 5 6 7 8 9 10 11 12 13 ... ... 15989 15990 15991 15992 [file transfer complete] [connected] ## Start Addr = 0x00000000 You can check the success of the download using the 'iminfo' command; |
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this includes a checksum verification so you can be sure no data |
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corruption happened: => imi 40100000 ## Checking Image at 40100000 ... Image Name: 2.2.13 for initrd on TQM850L Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 335725 Bytes = 327 kB = 0 MB Load Address: 00000000 Entry Point: 0000000c Verifying Checksum ... OK Boot Linux: ----------- The "bootm" command is used to boot an application that is stored in memory (RAM or Flash). In case of a Linux kernel image, the contents of the "bootargs" environment variable is passed to the kernel as parameters. You can check and modify this variable using the "printenv" and "setenv" commands: => printenv bootargs bootargs=root=/dev/ram => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 => printenv bootargs bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 => bootm 40020000 ## Booting Linux kernel at 40020000 ... Image Name: 2.2.13 for NFS on TQM850L Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 381681 Bytes = 372 kB = 0 MB Load Address: 00000000 Entry Point: 0000000c Verifying Checksum ... OK Uncompressing Kernel Image ... OK Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 time_init: decrementer frequency = 187500000/60 Calibrating delay loop... 49.77 BogoMIPS Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] ... |
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If you want to boot a Linux kernel with initial RAM disk, you pass |
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the memory addresses of both the kernel and the initrd image (PPBCOOT format!) to the "bootm" command: => imi 40100000 40200000 ## Checking Image at 40100000 ... Image Name: 2.2.13 for initrd on TQM850L Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 335725 Bytes = 327 kB = 0 MB Load Address: 00000000 Entry Point: 0000000c Verifying Checksum ... OK ## Checking Image at 40200000 ... Image Name: Simple Ramdisk Image Image Type: PowerPC Linux RAMDisk Image (gzip compressed) Data Size: 566530 Bytes = 553 kB = 0 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK => bootm 40100000 40200000 ## Booting Linux kernel at 40100000 ... Image Name: 2.2.13 for initrd on TQM850L Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 335725 Bytes = 327 kB = 0 MB Load Address: 00000000 Entry Point: 0000000c Verifying Checksum ... OK Uncompressing Kernel Image ... OK ## Loading RAMDisk Image at 40200000 ... Image Name: Simple Ramdisk Image Image Type: PowerPC Linux RAMDisk Image (gzip compressed) Data Size: 566530 Bytes = 553 kB = 0 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Loading Ramdisk ... OK Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000 Boot arguments: root=/dev/ram time_init: decrementer frequency = 187500000/60 Calibrating delay loop... 49.77 BogoMIPS ... RAMDISK: Compressed image found at block 0 VFS: Mounted root (ext2 filesystem). bash# |
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Boot Linux and pass a flat device tree: ----------- First, U-Boot must be compiled with the appropriate defines. See the section titled "Linux Kernel Interface" above for a more in depth explanation. The following is an example of how to start a kernel and pass an updated flat device tree: => print oftaddr oftaddr=0x300000 => print oft oft=oftrees/mpc8540ads.dtb => tftp $oftaddr $oft Speed: 1000, full duplex Using TSEC0 device TFTP from server 192.168.1.1; our IP address is 192.168.1.101 Filename 'oftrees/mpc8540ads.dtb'. Load address: 0x300000 Loading: # done Bytes transferred = 4106 (100a hex) => tftp $loadaddr $bootfile Speed: 1000, full duplex Using TSEC0 device TFTP from server 192.168.1.1; our IP address is 192.168.1.2 Filename 'uImage'. Load address: 0x200000 Loading:############ done Bytes transferred = 1029407 (fb51f hex) => print loadaddr loadaddr=200000 => print oftaddr oftaddr=0x300000 => bootm $loadaddr - $oftaddr ## Booting image at 00200000 ... |
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Image Name: Linux-2.6.17-dirty Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 1029343 Bytes = 1005.2 kB |
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Load Address: 00000000 |
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Entry Point: 00000000 |
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Verifying Checksum ... OK Uncompressing Kernel Image ... OK Booting using flat device tree at 0x300000 Using MPC85xx ADS machine description Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb [snip] |
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More About U-Boot Image Types: ------------------------------ U-Boot supports the following image types: "Standalone Programs" are directly runnable in the environment provided by U-Boot; it is expected that (if they behave well) you can continue to work in U-Boot after return from the Standalone Program. "OS Kernel Images" are usually images of some Embedded OS which will take over control completely. Usually these programs will install their own set of exception handlers, device drivers, set up the MMU, etc. - this means, that you cannot expect to re-enter U-Boot except by resetting the CPU. "RAMDisk Images" are more or less just data blocks, and their parameters (address, size) are passed to an OS kernel that is being started. "Multi-File Images" contain several images, typically an OS (Linux) kernel image and one or more data images like RAMDisks. This construct is useful for instance when you want to boot over the network using BOOTP etc., where the boot server provides just a single image file, but you want to get for instance an OS kernel and a RAMDisk image. "Multi-File Images" start with a list of image sizes, each image size (in bytes) specified by an "uint32_t" in network byte order. This list is terminated by an "(uint32_t)0". Immediately after the terminating 0 follow the images, one by one, all aligned on "uint32_t" boundaries (size rounded up to a multiple of 4 bytes). "Firmware Images" are binary images containing firmware (like U-Boot or FPGA images) which usually will be programmed to flash memory. "Script files" are command sequences that will be executed by U-Boot's command interpreter; this feature is especially useful when you configure U-Boot to use a real shell (hush) as command interpreter. |
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Booting the Linux zImage: ------------------------- On some platforms, it's possible to boot Linux zImage. This is done using the "bootz" command. The syntax of "bootz" command is the same as the syntax of "bootm" command. |
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Note, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply kernel with raw initrd images. The syntax is slightly different, the address of the initrd must be augmented by it's size, in the following format: "<initrd addres>:<initrd size>". |
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Standalone HOWTO: ================= One of the features of U-Boot is that you can dynamically load and run "standalone" applications, which can use some resources of U-Boot like console I/O functions or interrupt services. Two simple examples are included with the sources: "Hello World" Demo: ------------------- 'examples/hello_world.c' contains a small "Hello World" Demo application; it is automatically compiled when you build U-Boot. It's configured to run at address 0x00040004, so you can play with it like that: => loads ## Ready for S-Record download ... ~>examples/hello_world.srec 1 2 3 4 5 6 7 8 9 10 11 ... [file transfer complete] [connected] ## Start Addr = 0x00040004 => go 40004 Hello World! This is a test. ## Starting application at 0x00040004 ... Hello World argc = 7 argv[0] = "40004" argv[1] = "Hello" argv[2] = "World!" argv[3] = "This" argv[4] = "is" argv[5] = "a" argv[6] = "test." argv[7] = "<NULL>" Hit any key to exit ... ## Application terminated, rc = 0x0 Another example, which demonstrates how to register a CPM interrupt handler with the U-Boot code, can be found in 'examples/timer.c'. Here, a CPM timer is set up to generate an interrupt every second. The interrupt service routine is trivial, just printing a '.' character, but this is just a demo program. The application can be controlled by the following keys: ? - print current values og the CPM Timer registers b - enable interrupts and start timer e - stop timer and disable interrupts q - quit application => loads ## Ready for S-Record download ... ~>examples/timer.srec 1 2 3 4 5 6 7 8 9 10 11 ... [file transfer complete] [connected] ## Start Addr = 0x00040004 => go 40004 ## Starting application at 0x00040004 ... TIMERS=0xfff00980 Using timer 1 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 Hit 'b': [q, b, e, ?] Set interval 1000000 us Enabling timer Hit '?': [q, b, e, ?] ........ tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 Hit '?': [q, b, e, ?] . tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 Hit '?': [q, b, e, ?] . tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 Hit '?': [q, b, e, ?] . tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 Hit 'e': [q, b, e, ?] ...Stopping timer Hit 'q': [q, b, e, ?] ## Application terminated, rc = 0x0 Minicom warning: ================ Over time, many people have reported problems when trying to use the "minicom" terminal emulation program for serial download. I (wd) consider minicom to be broken, and recommend not to use it. Under Unix, I recommend to use C-Kermit for general purpose use (and especially for kermit binary protocol download ("loadb" command), and |
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use "cu" for S-Record download ("loads" command). See http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3. for help with kermit. |
2729af9d5 * Fix minor NAND ... |
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Nevertheless, if you absolutely want to use it try adding this configuration to your "File transfer protocols" section: Name Program Name U/D FullScr IO-Red. Multi X kermit /usr/bin/kermit -i -l %l -s Y U Y N N Y kermit /usr/bin/kermit -i -l %l -r N D Y N N NetBSD Notes: ============= Starting at version 0.9.2, U-Boot supports NetBSD both as host (build U-Boot) and target system (boots NetBSD/mpc8xx). Building requires a cross environment; it is known to work on NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also need gmake since the Makefiles are not compatible with BSD make). Note that the cross-powerpc package does not install include files; attempting to build U-Boot will fail because <machine/ansi.h> is missing. This file has to be installed and patched manually: # cd /usr/pkg/cross/powerpc-netbsd/include # mkdir powerpc # ln -s powerpc machine # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST Native builds *don't* work due to incompatibilities between native and U-Boot include files. Booting assumes that (the first part of) the image booted is a stage-2 loader which in turn loads and then invokes the kernel proper. Loader sources will eventually appear in the NetBSD source tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the |
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meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz |
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Implementation Internals: ========================= The following is not intended to be a complete description of every implementation detail. However, it should help to understand the inner workings of U-Boot and make it easier to port it to custom hardware. Initial Stack, Global Data: --------------------------- The implementation of U-Boot is complicated by the fact that U-Boot starts running out of ROM (flash memory), usually without access to system RAM (because the memory controller is not initialized yet). This means that we don't have writable Data or BSS segments, and BSS is not initialized as zero. To be able to get a C environment working at all, we have to allocate at least a minimal stack. Implementation options for this are defined and restricted by the CPU used: Some CPU models provide on-chip memory (like the IMMR area on MPC8xx and MPC826x processors), on others (parts of) the data cache can be locked as (mis-) used as memory, etc. |
218ca724c README: update do... |
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Chris Hallinan posted a good summary of these issues to the |
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4658 |
U-Boot mailing list: |
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Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? From: "Chris Hallinan" <clh@net1plus.com> Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) ... Correct me if I'm wrong, folks, but the way I understand it is this: Using DCACHE as initial RAM for Stack, etc, does not require any physical RAM backing up the cache. The cleverness is that the cache is being used as a temporary supply of necessary storage before the SDRAM controller is setup. It's |
11ccc33fa Many spelling fix... |
4670 |
beyond the scope of this list to explain the details, but you |
2729af9d5 * Fix minor NAND ... |
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can see how this works by studying the cache architecture and operation in the architecture and processor-specific manuals. OCM is On Chip Memory, which I believe the 405GP has 4K. It is another option for the system designer to use as an |
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4676 |
initial stack/RAM area prior to SDRAM being available. Either |
2729af9d5 * Fix minor NAND ... |
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option should work for you. Using CS 4 should be fine if your board designers haven't used it for something that would cause you grief during the initial boot! It is frequently not used. |
6d0f6bcf3 rename CFG_ macro... |
4681 |
CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere |
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with your processor/board/system design. The default value you will find in any recent u-boot distribution in |
8a316c9b6 Major cleanup for... |
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walnut.h should work for you. I'd set it to a value larger |
2729af9d5 * Fix minor NAND ... |
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than your SDRAM module. If you have a 64MB SDRAM module, set it above 400_0000. Just make sure your board has no resources that are supposed to respond to that address! That code in start.S has been around a while and should work as is when you get the config right. -Chris Hallinan DS4.COM, Inc. It is essential to remember this, since it has some impact on the C code for the initialization procedures: * Initialized global data (data segment) is read-only. Do not attempt to write it. |
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* Do not use any uninitialized global data (or implicitely initialized |
2729af9d5 * Fix minor NAND ... |
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as zero data - BSS segment) at all - this is undefined, initiali- zation is performed later (when relocating to RAM). * Stack space is very limited. Avoid big data buffers or things like that. Having only the stack as writable memory limits means we cannot use normal global data to share information beween the code. But it turned out that the implementation of U-Boot can be greatly simplified by making a global data structure (gd_t) available to all functions. We could pass a pointer to this data as argument to _all_ functions, but this would bloat the code. Instead we use a feature of the GCC compiler (Global Register Variables) to share the data: we place a pointer (gd) to the global data into a register which we reserve for this purpose. When choosing a register for such a purpose we are restricted by the relevant (E)ABI specifications for the current architecture, and by GCC's implementation. For PowerPC, the following registers have specific use: R1: stack pointer |
e7670f6c1 PPC: Use r2 inste... |
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R2: reserved for system use |
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R3-R4: parameter passing and return values R5-R10: parameter passing R13: small data area pointer R30: GOT pointer R31: frame pointer |
e6bee8081 ppc: Update READM... |
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(U-Boot also uses R12 as internal GOT pointer. r12 is a volatile register so r12 needs to be reset when going back and forth between asm and C) |
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|
e7670f6c1 PPC: Use r2 inste... |
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==> U-Boot will use R2 to hold a pointer to the global data |
2729af9d5 * Fix minor NAND ... |
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Note: on PPC, we could use a static initializer (since the address of the global data structure is known at compile time), but it turned out that reserving a register results in somewhat smaller code - although the code savings are not that big (on average for all boards 752 bytes for the whole U-Boot image, 624 text + 127 data). |
c4db335c2 Blackfin: change ... |
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On Blackfin, the normal C ABI (except for P3) is followed as documented here: |
4c58eb555 add some more Bla... |
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http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface |
c4db335c2 Blackfin: change ... |
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==> U-Boot will use P3 to hold a pointer to the global data |
4c58eb555 add some more Bla... |
4743 |
|
2729af9d5 * Fix minor NAND ... |
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On ARM, the following registers are used: R0: function argument word/integer result R1-R3: function argument word R9: GOT pointer R10: stack limit (used only if stack checking if enabled) R11: argument (frame) pointer R12: temporary workspace R13: stack pointer R14: link register R15: program counter ==> U-Boot will use R8 to hold a pointer to the global data |
0df01fd3d nios2: fix r15 is... |
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On Nios II, the ABI is documented here: http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf ==> U-Boot will use gp to hold a pointer to the global data Note: on Nios II, we give "-G0" option to gcc and don't use gp to access small data sections, so gp is free. |
afc1ce828 doc/README: docum... |
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On NDS32, the following registers are used: R0-R1: argument/return R2-R5: argument R15: temporary register for assembler R16: trampoline register R28: frame pointer (FP) R29: global pointer (GP) R30: link register (LP) R31: stack pointer (SP) PC: program counter (PC) ==> U-Boot will use R10 to hold a pointer to the global data |
d87080b72 GCC-4.x fixes: cl... |
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NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, or current versions of GCC may "optimize" the code too much. |
2729af9d5 * Fix minor NAND ... |
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Memory Management: ------------------ U-Boot runs in system state and uses physical addresses, i.e. the MMU is not used either for address mapping nor for memory protection. The available memory is mapped to fixed addresses using the memory controller. In this process, a contiguous block is formed for each memory type (Flash, SDRAM, SRAM), even when it consists of several physical memory banks. U-Boot is installed in the first 128 kB of the first Flash bank (on TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After booting and sizing and initializing DRAM, the code relocates itself to the upper end of DRAM. Immediately below the U-Boot code some |
6d0f6bcf3 rename CFG_ macro... |
4795 |
memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN |
2729af9d5 * Fix minor NAND ... |
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configuration setting]. Below that, a structure with global Board Info data is placed, followed by the stack (growing downward). Additionally, some exception handler code is copied to the low 8 kB of DRAM (0x00000000 ... 0x00001FFF). So a typical memory configuration with 16 MB of DRAM could look like this: 0x0000 0000 Exception Vector code : 0x0000 1FFF 0x0000 2000 Free for Application Use : : : : 0x00FB FF20 Monitor Stack (Growing downward) 0x00FB FFAC Board Info Data and permanent copy of global data 0x00FC 0000 Malloc Arena : 0x00FD FFFF 0x00FE 0000 RAM Copy of Monitor Code ... eventually: LCD or video framebuffer ... eventually: pRAM (Protected RAM - unchanged by reset) 0x00FF FFFF [End of RAM] System Initialization: ---------------------- |
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4827 |
|
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In the reset configuration, U-Boot starts at the reset entry point |
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4829 |
(on most PowerPC systems at address 0x00000100). Because of the reset |
2729af9d5 * Fix minor NAND ... |
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configuration for CS0# this is a mirror of the onboard Flash memory. To be able to re-map memory U-Boot then jumps to its link address. To be able to implement the initialization code in C, a (small!) initial stack is set up in the internal Dual Ported RAM (in case CPUs which provide such a feature like MPC8xx or MPC8260), or in a locked part of the data cache. After that, U-Boot initializes the CPU core, the caches and the SIU. Next, all (potentially) available memory banks are mapped using a preliminary mapping. For example, we put them on 512 MB boundaries (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is programmed for SDRAM access. Using the temporary configuration, a simple memory test is run that determines the size of the SDRAM banks. When there is more than one SDRAM bank, and the banks are of different size, the largest is mapped first. For equal size, the first bank (CS2#) is mapped first. The first mapping is always for address 0x00000000, with any additional banks following immediately to create contiguous memory starting from 0. Then, the monitor installs itself at the upper end of the SDRAM area and allocates memory for use by malloc() and for the global Board Info data; also, the exception vector code is copied to the low RAM pages, and the final stack is set up. Only after this relocation will you have a "normal" C environment; until that you are restricted in several ways, mostly because you are running from ROM, and because the code will have to be relocated to a new address in RAM. U-Boot Porting Guide: ---------------------- |
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4865 |
|
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[Based on messages by Jerry Van Baren in the U-Boot-Users mailing list, October 2002] |
c609719b8 Initial revision |
4868 |
|
6c3fef28b Improve U-Boot Po... |
4869 |
int main(int argc, char *argv[]) |
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{ sighandler_t no_more_time; |
c609719b8 Initial revision |
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|
6c3fef28b Improve U-Boot Po... |
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signal(SIGALRM, no_more_time); alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); |
c609719b8 Initial revision |
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|
2729af9d5 * Fix minor NAND ... |
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if (available_money > available_manpower) { |
6c3fef28b Improve U-Boot Po... |
4877 |
Pay consultant to port U-Boot; |
c609719b8 Initial revision |
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return 0; } |
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Download latest U-Boot source; |
0668236ba README: update ma... |
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Subscribe to u-boot mailing list; |
2729af9d5 * Fix minor NAND ... |
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|
6c3fef28b Improve U-Boot Po... |
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if (clueless) email("Hi, I am new to U-Boot, how do I get started?"); |
2729af9d5 * Fix minor NAND ... |
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while (learning) { Read the README file in the top level directory; |
6c3fef28b Improve U-Boot Po... |
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Read http://www.denx.de/twiki/bin/view/DULG/Manual; Read applicable doc/*.README; |
2729af9d5 * Fix minor NAND ... |
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Read the source, Luke; |
6c3fef28b Improve U-Boot Po... |
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/* find . -name "*.[chS]" | xargs grep -i <keyword> */ |
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} |
6c3fef28b Improve U-Boot Po... |
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if (available_money > toLocalCurrency ($2500)) Buy a BDI3000; else |
2729af9d5 * Fix minor NAND ... |
4896 |
Add a lot of aggravation and time; |
2729af9d5 * Fix minor NAND ... |
4897 |
|
6c3fef28b Improve U-Boot Po... |
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if (a similar board exists) { /* hopefully... */ cp -a board/<similar> board/<myboard> cp include/configs/<similar>.h include/configs/<myboard>.h } else { Create your own board support subdirectory; Create your own board include/configs/<myboard>.h file; } Edit new board/<myboard> files Edit new include/configs/<myboard>.h while (!accepted) { while (!running) { do { Add / modify source code; } until (compiles); Debug; if (clueless) email("Hi, I am having problems..."); } Send patch file to the U-Boot email list; if (reasonable critiques) Incorporate improvements from email list code review; else Defend code as written; |
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} |
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return 0; } void no_more_time (int sig) { hire_a_guru(); } |
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|
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Coding Standards: ----------------- |
c609719b8 Initial revision |
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|
2729af9d5 * Fix minor NAND ... |
4935 |
All contributions to U-Boot should conform to the Linux kernel |
2c0516517 Added changelog e... |
4936 |
coding style; see the file "Documentation/CodingStyle" and the script |
7ca9296e1 README: udate Cod... |
4937 |
"scripts/Lindent" in your Linux kernel source directory. |
2c0516517 Added changelog e... |
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Source files originating from a different project (for example the MTD subsystem) are generally exempt from these guidelines and are not reformated to ease subsequent migration to newer versions of those sources. Please note that U-Boot is implemented in C (and to some small parts in Assembler); no C++ is used, so please do not use C++ style comments (//) in your code. |
c609719b8 Initial revision |
4947 |
|
2729af9d5 * Fix minor NAND ... |
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Please also stick to the following formatting rules: - remove any trailing white space |
7ca9296e1 README: udate Cod... |
4950 |
- use TAB characters for indentation and vertical alignment, not spaces |
2729af9d5 * Fix minor NAND ... |
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- make sure NOT to use DOS '\r ' line feeds |
7ca9296e1 README: udate Cod... |
4953 |
- do not add more than 2 consecutive empty lines to source files |
2729af9d5 * Fix minor NAND ... |
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- do not add trailing empty lines to source files |
180d3f74e * Fix problems ca... |
4955 |
|
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Submissions which do not conform to the standards may be returned with a request to reformat the changes. |
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|
2729af9d5 * Fix minor NAND ... |
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Submitting Patches: ------------------- |
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|
2729af9d5 * Fix minor NAND ... |
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Since the number of patches for U-Boot is growing, we need to establish some rules. Submissions which do not conform to these rules may be rejected, even when they contain important and valuable stuff. |
c609719b8 Initial revision |
4965 |
|
0d28f34bb Update the U-Boot... |
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Please see http://www.denx.de/wiki/U-Boot/Patches for details. |
218ca724c README: update do... |
4967 |
|
0668236ba README: update ma... |
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Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; see http://lists.denx.de/mailman/listinfo/u-boot |
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When you send a patch, please include the following information with it: |
c609719b8 Initial revision |
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|
2729af9d5 * Fix minor NAND ... |
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* For bug fixes: a description of the bug and how your patch fixes this bug. Please try to include a way of demonstrating that the patch actually fixes something. |
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|
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* For new features: a description of the feature and your implementation. |
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|
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* A CHANGELOG entry as plaintext (separate from the patch) |
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|
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* For major contributions, your entry to the CREDITS file |
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|
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* When you add support for a new board, don't forget to add this |
7ca9296e1 README: udate Cod... |
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board to the MAINTAINERS file, too. |
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|
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* If your patch adds new configuration options, don't forget to document these in the README file. |
c609719b8 Initial revision |
4989 |
|
218ca724c README: update do... |
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* The patch itself. If you are using git (which is *strongly* recommended) you can easily generate the patch using the |
7ca9296e1 README: udate Cod... |
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"git format-patch". If you then use "git send-email" to send it to |
218ca724c README: update do... |
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the U-Boot mailing list, you will avoid most of the common problems with some other mail clients. If you cannot use git, use "diff -purN OLD NEW". If your version of diff does not support these options, then get the latest version of GNU diff. |
c609719b8 Initial revision |
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|
218ca724c README: update do... |
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The current directory when running this command shall be the parent directory of the U-Boot source tree (i. e. please make sure that your patch includes sufficient directory information for the affected files). |
6dff55297 * Patches by Mart... |
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|
218ca724c README: update do... |
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We prefer patches as plain text. MIME attachments are discouraged, and compressed attachments must not be used. |
c609719b8 Initial revision |
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|
2729af9d5 * Fix minor NAND ... |
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* If one logical set of modifications affects or creates several files, all these changes shall be submitted in a SINGLE patch file. |
52f52c149 Patches by Robert... |
5010 |
|
2729af9d5 * Fix minor NAND ... |
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* Changesets that contain different, unrelated modifications shall be submitted as SEPARATE patches, one patch per changeset. |
8bde7f776 * Code cleanup: |
5013 |
|
52f52c149 Patches by Robert... |
5014 |
|
2729af9d5 * Fix minor NAND ... |
5015 |
Notes: |
c609719b8 Initial revision |
5016 |
|
2729af9d5 * Fix minor NAND ... |
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* Before sending the patch, run the MAKEALL script on your patched source tree and make sure that no errors or warnings are reported for any of the boards. |
c609719b8 Initial revision |
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|
2729af9d5 * Fix minor NAND ... |
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* Keep your modifications to the necessary minimum: A patch containing several unrelated changes or arbitrary reformats will be returned with a request to re-formatting / split it. |
c609719b8 Initial revision |
5024 |
|
2729af9d5 * Fix minor NAND ... |
5025 5026 5027 5028 5029 5030 |
* If you modify existing code, make sure that your new code does not add to the memory footprint of the code ;-) Small is beautiful! When adding new features, these should compile conditionally only (using #ifdef), and the resulting code with the new feature disabled must not need more memory than the old code without your modification. |
90dc67049 README: add expla... |
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|
0668236ba README: update ma... |
5032 5033 5034 5035 |
* Remember that there is a size limit of 100 kB per message on the u-boot mailing list. Bigger patches will be moderated. If they are reasonable and not too big, they will be acknowledged. But patches bigger than the size limit should be avoided. |