Eric Lee / smarc-uboot

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d41ce506b   Eric Lee   Initial Release, ... 
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  ------------------------------------------------------------------
  Freescale PBL(pre-boot loader) Boot Image generation using mkimage
  ------------------------------------------------------------------
  
  The CoreNet SoC's can boot directly from eSPI FLASH, SD/MMC and
  NAND, etc. These SoCs use PBL to load RCW and/or pre-initialization
  instructions. For more details refer section 5 Pre-boot loader
  specifications of reference manual P3041RM/P4080RM/P5020RM at link:
  http://www.freescale.com/webapp/search/Serp.jsp?Reference+Manuals
  
  Building PBL Boot Image and boot steps
  --------------------------------------
  
  1. Building PBL Boot Image.
     The default Image is u-boot.pbl.
  
     For eSPI boot(available on P2041/P3041/P4080/P5020/P5040/T4240):
  	To build the eSPI boot image:
  	make <board_name>_SPIFLASH
  
     For SD boot(available on P2041/P3041/P4080/P5020/P5040/T4240):
  	To build the SD boot image:
  	make <board_name>_SDCARD
  
     For Nand boot(available on P2041/P3041/P5020/P5040):
  	To build the NAND boot image:
  	make <board_name>_NAND
  
  
  2. pblimage support available with mkimage utility will generate Freescale PBL
  boot image that can be flashed on the board eSPI flash, SD/MMC and NAND.
  Following steps describe it in detail.
  
  	1). Boot from eSPI flash
  	Write u-boot.pbl to eSPI flash from offset 0x0.
  	for ex in u-boot:
  	=>tftp 100000 u-boot.pbl
  	=>sf probe 0
  	=>sf erase 0 100000
  	=>sf write 100000 0 $filesize
  	Change SW1[1:5] = off off on off on.
  
  	2). Boot from SD/MMC
  	Write u-boot.pbl to SD/MMC from offset 0x1000.
  	for ex in u-boot:
  	=>tftp 100000 u-boot.pbl
  	=>mmcinfo
  	=>mmc write 100000 8 441
  	Change SW1[1:5] = off off on on off.
  
  	3). Boot from Nand
  	Write u-boot.pbl to Nand from offset 0x0.
  	for ex in u-boot:
  	=>tftp 100000 u-boot.pbl
  	=>nand info
  	=>nand erase 0 100000
  	=>nand write 100000 0 $filesize
  	Change SW1[1:5] = off on off off on
  	Change SW7[1:4] = on off off on
  
  Board specific configuration file specifications:
  ------------------------------------------------
  1. Configuration files rcw.cfg and pbi.cfg must present in the
  board/freescale/corenet_ds/, rcw.cfg is for RCW, pbi.cfg is for
  PBI instructions. File name must not be changed since they are used
  in Makefile.
  2. These files can have empty lines and lines starting with "#" as first
  character to put comments
  
  Typical example of rcw.cfg file:
  -----------------------------------
  
  #PBL preamble and RCW header
  aa55aa55 010e0100
  #64 bytes RCW data
  4c580000 00000000 18185218 0000cccc
  40464000 3c3c2000 58000000 61000000
  00000000 00000000 00000000 008b6000
  00000000 00000000 00000000 00000000
  
  Typical example of pbi.cfg file:
  -----------------------------------
  
  #PBI commands
  #Initialize CPC1
  09010000 00200400
  09138000 00000000
  091380c0 00000100
  09010100 00000000
  09010104 fff0000b
  09010f00 08000000
  09010000 80000000
  #Configure LAW for CPC1
  09000d00 00000000
  09000d04 fff00000
  09000d08 81000013
  09000010 00000000
  09000014 ff000000
  09000018 81000000
  #Initialize eSPI controller
  09110000 80000403
  09110020 2d170008
  09110024 00100008
  09110028 00100008
  0911002c 00100008
  #Flush PBL data
  09138000 00000000
  091380c0 00000000
  
  ------------------------------------------------
  Author: Shaohui Xie<Shaohui.Xie@freescale.com>