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Documentation/kernel-parameters.txt
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Kernel Parameters ~~~~~~~~~~~~~~~~~ |
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The following is a consolidated list of the kernel parameters as implemented (mostly) by the __setup() macro and sorted into English Dictionary order (defined as ignoring all punctuation and sorting digits before letters in a case insensitive manner), and with descriptions where known. Module parameters for loadable modules are specified only as the parameter name with optional '=' and value as appropriate, such as: modprobe usbcore blinkenlights=1 Module parameters for modules that are built into the kernel image are specified on the kernel command line with the module name plus '.' plus parameter name, with '=' and value if appropriate, such as: usbcore.blinkenlights=1 |
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Hyphens (dashes) and underscores are equivalent in parameter names, so log_buf_len=1M print-fatal-signals=1 can also be entered as log-buf-len=1M print_fatal_signals=1 |
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This document may not be entirely up to date and comprehensive. The command "modinfo -p ${modulename}" shows a current list of all parameters of a loadable module. Loadable modules, after being loaded into the running kernel, also reveal their parameters in /sys/module/${modulename}/parameters/. Some of these parameters may be changed at runtime by the command "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". |
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The parameters listed below are only valid if certain kernel build options were enabled and if respective hardware is present. The text in square brackets at the beginning of each description states the restrictions within which a parameter is applicable: |
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ACPI ACPI support is enabled. |
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AGP AGP (Accelerated Graphics Port) is enabled. |
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ALSA ALSA sound support is enabled. APIC APIC support is enabled. APM Advanced Power Management support is enabled. |
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AVR32 AVR32 architecture is enabled. |
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AX25 Appropriate AX.25 support is enabled. |
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BLACKFIN Blackfin architecture is enabled. |
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DRM Direct Rendering Management support is enabled. |
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EDD BIOS Enhanced Disk Drive Services (EDD) is enabled EFI EFI Partitioning (GPT) is enabled EIDE EIDE/ATAPI support is enabled. FB The frame buffer device is enabled. |
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GCOV GCOV profiling is enabled. |
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HW Appropriate hardware is enabled. |
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IA-64 IA-64 architecture is enabled. |
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IMA Integrity measurement architecture is enabled. |
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IOSCHED More than one I/O scheduler is enabled. |
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IP_PNP IP DHCP, BOOTP, or RARP is enabled. |
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IPV6 IPv6 support is enabled. |
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ISAPNP ISA PnP code is enabled. ISDN Appropriate ISDN support is enabled. JOY Appropriate joystick support is enabled. |
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KGDB Kernel debugger support is enabled. |
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KVM Kernel Virtual Machine support is enabled. |
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LIBATA Libata driver is enabled |
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LP Printer support is enabled. LOOP Loopback device support is enabled. M68k M68k architecture is enabled. These options have more detailed description inside of Documentation/m68k/kernel-options.txt. MCA MCA bus support is enabled. MDA MDA console support is enabled. MOUSE Appropriate mouse support is enabled. |
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MSI Message Signaled Interrupts (PCI). |
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MTD MTD (Memory Technology Device) support is enabled. |
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NET Appropriate network support is enabled. NUMA NUMA support is enabled. |
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GENERIC_TIME The generic timeofday code is enabled. |
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NFS Appropriate NFS support is enabled. OSS OSS sound support is enabled. |
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PV_OPS A paravirtualized kernel is enabled. PARIDE The ParIDE (parallel port IDE) subsystem is enabled. |
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PARISC The PA-RISC architecture is enabled. PCI PCI bus support is enabled. |
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PCIE PCI Express support is enabled. |
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PCMCIA The PCMCIA subsystem is enabled. PNP Plug & Play support is enabled. PPC PowerPC architecture is enabled. PPT Parallel port support is enabled. PS2 Appropriate PS/2 support is enabled. RAM RAM disk support is enabled. S390 S390 architecture is enabled. SCSI Appropriate SCSI support is enabled. A lot of drivers has their options described inside of Documentation/scsi/. |
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SECURITY Different security models are enabled. |
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SELINUX SELinux support is enabled. SERIAL Serial support is enabled. |
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SH SuperH architecture is enabled. |
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SMP The kernel is an SMP kernel. SPARC Sparc architecture is enabled. |
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SWSUSP Software suspend (hibernation) is enabled. SUSPEND System suspend states are enabled. |
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FTRACE Function tracing enabled. |
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TPM TPM drivers are enabled. |
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TS Appropriate touchscreen support is enabled. |
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UMS USB Mass Storage support is enabled. |
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USB USB support is enabled. USBHID USB Human Interface Device support is enabled. V4L Video For Linux support is enabled. VGA The VGA console has been enabled. VT Virtual terminal support is enabled. WDT Watchdog support is enabled. XT IBM PC/XT MFM hard disk support is enabled. |
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X86-32 X86-32, aka i386 architecture is enabled. |
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X86-64 X86-64 architecture is enabled. More X86-64 boot options can be found in |
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Documentation/x86/x86_64/boot-options.txt . |
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X86 Either 32bit or 64bit x86 (same as X86-32+X86-64) |
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In addition, the following text indicates that the option: BUGS= Relates to possible processor bugs on the said processor. KNL Is a kernel start-up parameter. BOOT Is a boot loader parameter. Parameters denoted with BOOT are actually interpreted by the boot loader, and have no meaning to the kernel directly. Do not modify the syntax of boot loader parameters without extreme |
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need or coordination with <Documentation/x86/boot.txt>. |
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There are also arch-specific kernel-parameters not documented here. |
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See for example <Documentation/x86/x86_64/boot-options.txt>. |
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Note that ALL kernel parameters listed below are CASE SENSITIVE, and that a trailing = on the name of any parameter states that that parameter will be entered as an environment variable, whereas its absence indicates that it will appear as a kernel argument readable via /proc/cmdline by programs running once the system is up. |
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The number of kernel parameters is not limited, but the length of the complete command line (parameters including spaces etc.) is limited to a fixed number of characters. This limit depends on the architecture and is between 256 and 4096 characters. It is defined in the file ./include/asm/setup.h as COMMAND_LINE_SIZE. |
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acpi= [HW,ACPI,X86] |
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Advanced Configuration and Power Interface |
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Format: { force | off | ht | strict | noirq | rsdt } |
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force -- enable ACPI if default was off off -- disable ACPI if default was on noirq -- do not use ACPI for IRQ routing ht -- run only enough ACPI to enable Hyper Threading |
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strict -- Be less tolerant of platforms that are not |
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strictly ACPI specification compliant. |
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rsdt -- prefer RSDT over (default) XSDT |
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copy_dsdt -- copy DSDT to memory |
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See also Documentation/power/pm.txt, pci=noacpi |
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acpi_apic_instance= [ACPI, IOAPIC] Format: <int> 2: use 2nd APIC table, if available 1,0: use 1st APIC table |
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default: 0 |
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acpi_backlight= [HW,ACPI] acpi_backlight=vendor acpi_backlight=video If set to vendor, prefer vendor specific driver (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver. |
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acpi.debug_layer= [HW,ACPI,ACPI_DEBUG] acpi.debug_level= [HW,ACPI,ACPI_DEBUG] |
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Format: <int> |
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CONFIG_ACPI_DEBUG must be enabled to produce any ACPI debug output. Bits in debug_layer correspond to a _COMPONENT in an ACPI source file, e.g., #define _COMPONENT ACPI_PCI_COMPONENT Bits in debug_level correspond to a level in ACPI_DEBUG_PRINT statements, e.g., ACPI_DEBUG_PRINT((ACPI_DB_INFO, ... |
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The debug_level mask defaults to "info". See Documentation/acpi/debug.txt for more information about debug layers and levels. |
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Enable processor driver info messages: acpi.debug_layer=0x20000000 Enable PCI/PCI interrupt routing info messages: acpi.debug_layer=0x400000 |
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Enable AML "Debug" output, i.e., stores to the Debug object while interpreting AML: acpi.debug_layer=0xffffffff acpi.debug_level=0x2 |
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Enable all messages related to ACPI hardware: acpi.debug_layer=0x2 acpi.debug_level=0xffffffff Some values produce so much output that the system is unusable. The "log_buf_len" parameter may be useful if you need to capture more output. |
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acpi_display_output= [HW,ACPI] acpi_display_output=vendor acpi_display_output=video See above. acpi_irq_balance [HW,ACPI] ACPI will balance active IRQs default in APIC mode acpi_irq_nobalance [HW,ACPI] ACPI will not move active IRQs (default) default in PIC mode acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA Format: <irq>,<irq>... acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for use by PCI Format: <irq>,<irq>... acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS Format: To spoof as Windows 98: ="Microsoft Windows" acpi_osi= [HW,ACPI] Modify list of supported OS interface strings acpi_osi="string1" # add string1 -- only one string acpi_osi="!string2" # remove built-in string2 acpi_osi= # disable all strings |
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acpi_pm_good [X86] |
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Override the pmtimer bug detection: force the kernel to assume that this machine's pmtimer latches its value and always returns good values. |
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acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode Format: { level | edge | high | low } acpi_serialize [HW,ACPI] force serialization of AML methods acpi_skip_timer_override [HW,ACPI] Recognize and ignore IRQ0/pin2 Interrupt Override. For broken nForce2 BIOS resulting in XT-PIC timer. acpi_sleep= [HW,ACPI] Sleep options Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, |
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old_ordering, s4_nonvs, sci_force_enable } |
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See Documentation/power/video.txt for information on s3_bios and s3_mode. s3_beep is for debugging; it makes the PC's speaker beep as soon as the kernel's real-mode entry point is called. s4_nohwsig prevents ACPI hardware signature from being used during resume from hibernation. old_ordering causes the ACPI 1.0 ordering of the _PTS control method, with respect to putting devices into low power states, to be enforced (the ACPI 2.0 ordering of _PTS is used by default). s4_nonvs prevents the kernel from saving/restoring the ACPI NVS memory during hibernation. |
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sci_force_enable causes the kernel to set SCI_EN directly on resume from S1/S3 (which is against the ACPI spec, but some broken systems don't work without it). |
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acpi_use_timer_override [HW,ACPI] Use timer override. For some broken Nvidia NF5 boards that require a timer override, but don't have HPET |
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acpi_enforce_resources= [ACPI] { strict | lax | no } Check for resource conflicts between native drivers and ACPI OperationRegions (SystemIO and SystemMemory only). IO ports and memory declared in ACPI might be used by the ACPI subsystem in arbitrary AML code and can interfere with legacy drivers. strict (default): access to resources claimed by ACPI is denied; legacy drivers trying to access reserved resources will fail to bind to device using them. lax: access to resources claimed by ACPI is allowed; legacy drivers trying to access reserved resources will bind successfully but a warning message is logged. no: ACPI OperationRegions are not marked as reserved, no further checks are performed. |
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ad1848= [HW,OSS] Format: <io>,<irq>,<dma>,<dma2>,<type> |
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add_efi_memmap [EFI; X86] Include EFI memory map in kernel's map of available physical RAM. |
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advansys= [HW,SCSI] See header of drivers/scsi/advansys.c. advwdt= [HW,WDT] Advantech WDT Format: <iostart>,<iostop> aedsp16= [HW,OSS] Audio Excel DSP 16 Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> See also header of sound/oss/aedsp16.c. |
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agp= [AGP] { off | try_unsupported } off: disable AGP support try_unsupported: try to drive unsupported chipsets (may crash computer or cause data corruption) |
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aha152x= [HW,SCSI] See Documentation/scsi/aha152x.txt. aha1542= [HW,SCSI] Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] aic7xxx= [HW,SCSI] See Documentation/scsi/aic7xxx.txt. aic79xx= [HW,SCSI] See Documentation/scsi/aic79xx.txt. |
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alignment= [KNL,ARM] Allow the default userspace alignment fault handler behaviour to be specified. Bit 0 enables warnings, bit 1 enables fixups, and bit 2 sends a segfault. |
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amd_iommu= [HW,X86-84] Pass parameters to the AMD IOMMU driver in the system. Possible values are: |
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fullflush - enable flushing of IO/TLB entries when they are unmapped. Otherwise they are flushed before they will be reused, which is a lot of faster |
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off - do not initialize any AMD IOMMU found in the system |
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amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: <a>,<b> See also Documentation/kernel/input/joystick.txt analog.map= [HW,JOY] Analog joystick and gamepad support Specifies type or capabilities of an analog joystick connected to one of 16 gameports Format: <type1>,<type2>,..<type16> |
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apc= [HW,SPARC] Power management functions (SPARCstation-4/5 + deriv.) |
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Format: noidle Disable APC CPU standby support. SPARCstation-Fox does not play well with APC CPU idle - disable it if you have APC and your system crashes randomly. |
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apic= [APIC,X86-32] Advanced Programmable Interrupt Controller |
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Change the output verbosity whilst booting |
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Format: { quiet (default) | verbose | debug } Change the amount of debugging information output when initialising the APIC and IO-APIC components. |
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autoconf= [IPV6] See Documentation/networking/ipv6.txt. |
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show_lapic= [APIC,X86] Advanced Programmable Interrupt Controller Limit apic dumping. The parameter defines the maximal number of local apics being dumped. Also it is possible to set it to "all" by meaning -- no limit here. Format: { 1 (default) | 2 | ... | all }. The parameter valid if only apic=debug or apic=verbose is specified. Example: apic=debug show_lapic=all |
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apm= [APM] Advanced Power Management |
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See header of arch/x86/kernel/apm_32.c. |
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arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards Format: <io>,<irq>,<nodeID> ataflop= [HW,M68k] atarimouse= [HW,MOUSE] Atari Mouse atascsi= [HW,SCSI] Atari SCSI atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, EzKey and similar keyboards atkbd.reset= [HW] Reset keyboard during initialization |
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atkbd.set= [HW] Select keyboard code set Format: <int> (2 = AT (default), 3 = PS/2) |
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atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar keyboards atkbd.softraw= [HW] Choose between synthetic and real raw mode Format: <bool> (0 = real, 1 = synthetic (default)) |
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atkbd.softrepeat= [HW] Use software keyboard repeat |
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autotest [IA64] |
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baycom_epp= [HW,AX25] Format: <io>,<mode> |
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baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem Format: <io>,<mode> See header of drivers/net/hamradio/baycom_par.c. |
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baycom_ser_fdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
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Format: <io>,<irq>,<mode>[,<baud>] See header of drivers/net/hamradio/baycom_ser_fdx.c. |
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baycom_ser_hdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
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Format: <io>,<irq>,<mode> See header of drivers/net/hamradio/baycom_ser_hdx.c. |
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boot_delay= Milliseconds to delay each printk during boot. Values larger than 10 seconds (10000) are changed to no delay (0). Format: integer |
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bootmem_debug [KNL] Enable bootmem allocator debug messages. |
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bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
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bttv.radio= Most important insmod options are available as kernel args too. |
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bttv.pll= See Documentation/video4linux/bttv/Insmod-options bttv.tuner= and Documentation/video4linux/bttv/CARDLIST BusLogic= [HW,SCSI] See drivers/scsi/BusLogic.c, comment before function BusLogic_ParseDriverOptions(). c101= [NET] Moxa C101 synchronous serial card |
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cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. |
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Sometimes CPU hardware bugs make them report the cache size incorrectly. The kernel will attempt work arounds to fix known problems, but for some CPUs it is not possible to determine what the correct size should be. This option provides an override for these situations. |
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capability.disable= [SECURITY] Disable capabilities. This would normally be used only if an alternative security model is to be configured. Potentially dangerous and should only be used if you are entirely sure of the consequences. |
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ccw_timeout_log [S390] See Documentation/s390/CommonIO for details. |
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cgroup_disable= [KNL] Disable a particular controller Format: {name of the controller(s) to disable} {Currently supported controllers - "memory"} |
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checkreqprot [SELINUX] Set initial checkreqprot flag value. Format: { "0" | "1" } See security/selinux/Kconfig help text. |
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0 -- check protection applied by kernel (includes any implied execute protection). |
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1 -- check protection requested by application. Default value is set via a kernel config option. |
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Value can be changed at runtime via /selinux/checkreqprot. |
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cio_ignore= [S390] See Documentation/s390/CommonIO for details. |
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clock= [BUGS=X86-32, HW] gettimeofday clocksource override. |
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435 |
[Deprecated] |
3f6dee9b2 Fix some typos in... |
436 |
Forces specified clocksource (if available) to be used |
734efb467 [PATCH] Time: Clo... |
437 |
when calculating gettimeofday(). If specified |
3f6dee9b2 Fix some typos in... |
438 |
clocksource is not available, it defaults to PIT. |
1da177e4c Linux-2.6.12-rc2 |
439 |
Format: { pit | tsc | cyclone | pmtmr } |
3d6ac9843 document clocksou... |
440 441 442 443 444 445 446 447 448 449 450 |
clocksource= [GENERIC_TIME] Override the default clocksource Format: <string> Override the default clocksource and use the clocksource with the name specified. Some clocksource names to choose from, depending on the platform: [all] jiffies (this is the base, fallback clocksource) [ACPI] acpi_pm [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, pxa_timer,timer3,32k_counter,timer0_1 [AVR32] avr32 |
cd4f0ef7c doc/kernel-parame... |
451 |
[X86-32] pit,hpet,tsc,vmi-timer; |
3d6ac9843 document clocksou... |
452 453 454 455 456 457 458 |
scx200_hrt on Geode; cyclone on IBM x440 [MIPS] MIPS [PARISC] cr16 [S390] tod [SH] SuperH [SPARC64] tick [X86-64] hpet,tsc |
ac72e7888 x86: add generic ... |
459 460 |
clearcpuid=BITNUM [X86] Disable CPUID feature X for the kernel. See |
07983f0e3 documentation: up... |
461 462 |
arch/x86/include/asm/cpufeature.h for the valid bit numbers. Note the Linux specific bits are not necessarily |
ac72e7888 x86: add generic ... |
463 464 465 466 467 468 469 470 |
stable over kernel options, but the vendor specific ones should be. Also note that user programs calling CPUID directly or using the feature without checking anything will still see it. This just prevents it from being used by the kernel or shown in /proc/cpuinfo. Also note the kernel might malfunction if you disable some critical bits. |
14f966e79 powerpc/pseries: ... |
471 472 473 474 475 476 |
cmo_free_hint= [PPC] Format: { yes | no } Specify whether pages are marked as being inactive when they are freed. This is used in CMO environments to determine OS memory pressure for page stealing by a hypervisor. Default: yes |
6cececfce x86, documentatio... |
477 |
code_bytes [X86] How many bytes of object code to print |
a25bd9496 x86: add the "pri... |
478 |
in an oops report. |
86c418374 [PATCH] i386: add... |
479 480 |
Range: 0 - 8192 Default: 64 |
1da177e4c Linux-2.6.12-rc2 |
481 |
com20020= [HW,NET] ARCnet - COM20020 chipset |
a99130449 [PATCH] kernel-pa... |
482 483 |
Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
1da177e4c Linux-2.6.12-rc2 |
484 485 486 |
com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) Format: <io>[,<irq>] |
a99130449 [PATCH] kernel-pa... |
487 488 |
com90xx= [HW,NET] ARCnet - COM90xx chipset (memory-mapped buffers) |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 |
Format: <io>[,<irq>[,<memstart>]] condev= [HW,S390] console device conmode= |
a99130449 [PATCH] kernel-pa... |
493 |
|
1da177e4c Linux-2.6.12-rc2 |
494 495 496 497 498 |
console= [KNL] Output console device and options. tty<n> Use the virtual console device <n>. ttyS<n>[,options] |
f1a1c2dc2 [PATCH] doc: more... |
499 |
ttyUSB0[,options] |
1da177e4c Linux-2.6.12-rc2 |
500 |
Use the specified serial port. The options are of |
f1a1c2dc2 [PATCH] doc: more... |
501 502 503 504 505 506 507 508 509 |
the form "bbbbpnf", where "bbbb" is the baud rate, "p" is parity ("n", "o", or "e"), "n" is number of bits, and "f" is flow control ("r" for RTS or omit it). Default is "9600n8". See Documentation/serial-console.txt for more information. See Documentation/networking/netconsole.txt for an alternative. |
1da177e4c Linux-2.6.12-rc2 |
510 |
|
18a8bd949 serial: convert e... |
511 512 |
uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] |
1da177e4c Linux-2.6.12-rc2 |
513 514 515 516 |
Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address, switching to the matching ttyS device later. The options are the same as for ttyS, above. |
f7511d5f6 Basic braille scr... |
517 518 519 520 |
If the device connected to the port is not a TTY but a braille device, prepend "brl," before the device type, for instance console=brl,ttyS0 For now, only VisioBraille is supported. |
f324edc85 console: make bla... |
521 522 523 |
consoleblank= [KNL] The console blank (screen saver) timeout in seconds. Defaults to 10*60 = 10mins. A value of 0 disables the blank timer. |
4cb0e11b1 coredump_filter: ... |
524 525 526 527 |
coredump_filter= [KNL] Change the default value for /proc/<pid>/coredump_filter. See also Documentation/filesystems/proc.txt. |
1da177e4c Linux-2.6.12-rc2 |
528 |
cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
a99130449 [PATCH] kernel-pa... |
529 530 |
Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
1da177e4c Linux-2.6.12-rc2 |
531 |
|
dc009d924 [PATCH] kexec: ad... |
532 533 534 |
crashkernel=nn[KMG]@ss[KMG] [KNL] Reserve a chunk of physical memory to hold a kernel to switch to with kexec on panic. |
fb391599f Add documentation... |
535 536 537 538 539 540 |
crashkernel=range1:size1[,range2:size2,...][@offset] [KNL] Same as above, but depends on the memory in the running system. The syntax of range is start-[end] where start and end are both a memory unit (amount[KMG]). See also Documentation/kdump/kdump.txt for a example. |
1da177e4c Linux-2.6.12-rc2 |
541 542 543 544 545 |
cs89x0_dma= [HW,NET] Format: <dma> cs89x0_media= [HW,NET] Format: { rj45 | aui | bnc } |
a99130449 [PATCH] kernel-pa... |
546 |
|
a99130449 [PATCH] kernel-pa... |
547 |
dasd= [HW,NET] |
1da177e4c Linux-2.6.12-rc2 |
548 549 550 551 552 553 554 555 |
See header of drivers/s390/block/dasd_devmap.c. db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port (one device per port) Format: <port#>,<type> See also Documentation/input/joystick-parport.txt debug [KNL] Enable kernel debugging (events log level). |
cae2ed9aa [PATCH] lockdep: ... |
556 557 558 559 560 561 562 563 |
debug_locks_verbose= [KNL] verbose self-tests Format=<0|1> Print debugging info while doing the locking API self-tests. We default to 0 (no extra messages), setting it to 1 will print _a lot_ more information - normally only useful to kernel developers. |
3ac7fe5a4 infrastructure to... |
564 |
debug_objects [KNL] Enable object debugging |
3e8ebb5c4 debug_objects: ad... |
565 566 |
no_debug_objects [KNL] Disable object debugging |
d3af01f18 Documentation: do... |
567 |
debugpat [X86] Enable PAT debugging |
2d27a9661 Documentation: "... |
568 |
decnet.addr= [HW,NET] |
1da177e4c Linux-2.6.12-rc2 |
569 570 |
Format: <area>[,<node>] See also Documentation/networking/decnet.txt. |
0cb55ad2a docs: alphabetize... |
571 572 573 574 575 576 577 |
default_hugepagesz= [same as hugepagesz=] The size of the default HugeTLB page size. This is the size represented by the legacy /proc/ hugepages APIs, used for SHM, and default size when mounting hugetlbfs filesystems. Defaults to the default architecture's huge page size if not specified. |
55ff9780e vt: add documenta... |
578 |
|
1da177e4c Linux-2.6.12-rc2 |
579 580 |
dhash_entries= [KNL] Set number of hash buckets for dentry cache. |
a99130449 [PATCH] kernel-pa... |
581 |
|
1da177e4c Linux-2.6.12-rc2 |
582 583 584 585 586 |
digi= [HW,SERIAL] IO parameters + enable/disable command. digiepca= [HW,SERIAL] See drivers/char/README.epca and |
31c00fc15 Create/use more d... |
587 |
Documentation/serial/digiepca.txt. |
1da177e4c Linux-2.6.12-rc2 |
588 |
|
b0f83b280 doc: document IPv... |
589 590 591 592 593 |
disable= [IPV6] See Documentation/networking/ipv6.txt. disable_ipv6= [IPV6] See Documentation/networking/ipv6.txt. |
95ffa2438 x86: mtrr cleanup... |
594 |
disable_mtrr_cleanup [X86] |
95ffa2438 x86: mtrr cleanup... |
595 596 |
The kernel tries to adjust MTRR layout from continuous to discrete, to make X server driver able to add WB |
0cb55ad2a docs: alphabetize... |
597 |
entry later. This parameter disables that. |
95ffa2438 x86: mtrr cleanup... |
598 |
|
093af8d7f x86_32: trim memo... |
599 |
disable_mtrr_trim [X86, Intel and AMD only] |
99fc8d424 x86, 32-bit: trim... |
600 601 602 603 |
By default the kernel will trim any uncacheable memory out of your available memory pool based on MTRR settings. This parameter disables that behavior, possibly causing your machine to run very slowly. |
6cececfce x86, documentatio... |
604 |
disable_timer_pin_1 [X86] |
0cb55ad2a docs: alphabetize... |
605 606 |
Disable PIN 1 of APIC timer Can be useful to work around chipset bugs. |
1da177e4c Linux-2.6.12-rc2 |
607 |
dmasound= [HW,OSS] Sound subsystem buffers |
0cb55ad2a docs: alphabetize... |
608 609 610 611 612 613 614 615 616 |
dma_debug=off If the kernel is compiled with DMA_API_DEBUG support, this option disables the debugging code at boot. dma_debug_entries=<number> This option allows to tune the number of preallocated entries for DMA-API debugging code. One entry is required per DMA-API allocation. Use this if the DMA-API debugging code disables itself because the architectural default is too low. |
1745de5e5 dma-debug: add dm... |
617 618 619 620 621 622 |
dma_debug_driver=<driver_name> With this option the DMA-API debugging driver filter feature can be enabled at boot time. Just pass the driver to filter for as the parameter. The filter can be disabled or changed to another driver later using sysfs. |
1da177e4c Linux-2.6.12-rc2 |
623 624 625 |
dscc4.setup= [NET] dtc3181e= [HW,SCSI] |
0cb55ad2a docs: alphabetize... |
626 627 628 629 630 631 632 633 634 635 636 |
dynamic_printk Enables pr_debug()/dev_dbg() calls if CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled. These can also be switched on/off via <debugfs>/dynamic_printk/modules earlycon= [KNL] Output early console device and options. uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address. The options are the same as for ttyS, above. |
6cececfce x86, documentatio... |
637 |
earlyprintk= [X86,SH,BLACKFIN] |
1da177e4c Linux-2.6.12-rc2 |
638 639 |
earlyprintk=vga earlyprintk=serial[,ttySn[,baudrate]] |
ea3acb199 x86: earlyprintk:... |
640 |
earlyprintk=ttySn[,baudrate] |
9780bc41d USB: ehci-dbgp,do... |
641 |
earlyprintk=dbgp[debugController#] |
1da177e4c Linux-2.6.12-rc2 |
642 |
|
a99130449 [PATCH] kernel-pa... |
643 |
Append ",keep" to not disable it when the real console |
1da177e4c Linux-2.6.12-rc2 |
644 |
takes over. |
5c05917e7 x86: usb debug po... |
645 |
Only vga or serial or usb debug port at a time. |
1da177e4c Linux-2.6.12-rc2 |
646 647 648 649 650 651 652 653 |
Currently only ttyS0 and ttyS1 are supported. Interaction with the standard serial driver is not very good. The VGA output is eventually overwritten by the real console. |
9731191f7 kgdboc: Add ekgdb... |
654 655 656 657 658 |
ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc=kbd This is desgined to be used in conjunction with the boot argument: earlyprintk=vga |
1da177e4c Linux-2.6.12-rc2 |
659 |
eata= [HW,SCSI] |
1da177e4c Linux-2.6.12-rc2 |
660 |
edd= [EDD] |
8c4dd6068 edd: add default ... |
661 |
Format: {"off" | "on" | "skip[mbr]"} |
1da177e4c Linux-2.6.12-rc2 |
662 |
|
1da177e4c Linux-2.6.12-rc2 |
663 664 |
eisa_irq_edge= [PARISC,HW] See header of drivers/parisc/eisa.c. |
cd4f0ef7c doc/kernel-parame... |
665 |
elanfreq= [X86-32] |
1da177e4c Linux-2.6.12-rc2 |
666 |
See comment before function elanfreq_setup() in |
71f77055d Doc*/kernel-param... |
667 |
arch/x86/kernel/cpu/cpufreq/elanfreq.c. |
1da177e4c Linux-2.6.12-rc2 |
668 669 |
elevator= [IOSCHED] |
16ab3adf5 [PATCH] Update ke... |
670 |
Format: {"anticipatory" | "cfq" | "deadline" | "noop"} |
a99130449 [PATCH] kernel-pa... |
671 672 |
See Documentation/block/as-iosched.txt and Documentation/block/deadline-iosched.txt for details. |
6cececfce x86, documentatio... |
673 |
elfcorehdr= [IA64,PPC,SH,X86] |
a99130449 [PATCH] kernel-pa... |
674 |
Specifies physical address of start of kernel core |
aac04b32f [PATCH] kdump: x8... |
675 676 677 |
image elf header. Generally kexec loader will pass this option to capture kernel. See Documentation/kdump/kdump.txt for details. |
1da177e4c Linux-2.6.12-rc2 |
678 |
|
0cb55ad2a docs: alphabetize... |
679 680 681 682 |
enable_mtrr_cleanup [X86] The kernel tries to adjust MTRR layout from continuous to discrete, to make X server driver able to add WB entry later. This parameter enables that. |
ca1eda2d7 doc: small kernel... |
683 |
enable_timer_pin_1 [X86] |
0cb55ad2a docs: alphabetize... |
684 685 686 687 |
Enable PIN 1 of APIC timer Can be useful to work around chipset bugs (in particular on some ATI chipsets). The kernel tries to set a reasonable default. |
1da177e4c Linux-2.6.12-rc2 |
688 689 690 691 692 693 694 |
enforcing [SELINUX] Set initial enforcing status. Format: {"0" | "1"} See security/selinux/Kconfig help text. 0 -- permissive (log only, no denials). 1 -- enforcing (deny and log). Default value is 0. Value can be changed at runtime via /selinux/enforce. |
1da177e4c Linux-2.6.12-rc2 |
695 696 697 698 699 700 |
ether= [HW,NET] Ethernet cards parameters This option is obsoleted by the "netdev=" option, which has equivalent usage. See its documentation for details. eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. Format: <io>[,<irq>] |
de1ba09b2 [PATCH] fault inj... |
701 702 703 704 705 706 |
failslab= fail_page_alloc= fail_make_request=[KNL] General fault injection mechanism. Format: <interval>,<probability>,<space>,<times> See also /Documentation/fault-injection/. |
1da177e4c Linux-2.6.12-rc2 |
707 708 709 710 711 712 713 |
fd_mcs= [HW,SCSI] See header of drivers/scsi/fd_mcs.c. fdomain= [HW,SCSI] See header of drivers/scsi/fdomain.c. floppy= [HW] |
31c00fc15 Create/use more d... |
714 |
See Documentation/blockdev/floppy.txt. |
1da177e4c Linux-2.6.12-rc2 |
715 |
|
f13ae30e1 [IA64] allow user... |
716 717 718 719 720 |
force_pal_cache_flush [IA-64] Avoid check_sal_cache_flush which may hang on buggy SAL_CACHE_FLUSH implementations. Using this parameter will force ia64_sal_cache_flush to call ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. |
d9e540762 ftrace: ftrace_du... |
721 |
ftrace=[tracer] |
2af15d6a4 ftrace: add kerne... |
722 |
[FTRACE] will set and start the specified tracer |
d9e540762 ftrace: ftrace_du... |
723 724 |
as early as possible in order to facilitate early boot debugging. |
cecbca96d tracing: Dump eit... |
725 |
ftrace_dump_on_oops[=orig_cpu] |
2af15d6a4 ftrace: add kerne... |
726 |
[FTRACE] will dump the trace buffers on oops. |
cecbca96d tracing: Dump eit... |
727 728 729 730 |
If no parameter is passed, ftrace will dump buffers of all CPUs, but if you pass orig_cpu, it will dump only the buffer of the CPU that triggered the oops. |
2af15d6a4 ftrace: add kerne... |
731 732 733 734 735 736 737 738 739 740 741 742 743 |
ftrace_filter=[function-list] [FTRACE] Limit the functions traced by the function tracer at boot up. function-list is a comma separated list of functions. This list can be changed at run time by the set_ftrace_filter file in the debugfs tracing directory. ftrace_notrace=[function-list] [FTRACE] Do not trace the functions specified in function-list. This list can be changed at run time by the set_ftrace_notrace file in the debugfs tracing directory. |
d9e540762 ftrace: ftrace_du... |
744 |
|
369bc18f9 ftrace: add kerne... |
745 746 747 748 749 750 |
ftrace_graph_filter=[function-list] [FTRACE] Limit the top level callers functions traced by the function graph tracer at boot up. function-list is a comma separated list of functions that can be changed at run time by the set_graph_function file in the debugfs tracing directory. |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 755 756 757 |
gamecon.map[2|3]= [HW,JOY] Multisystem joystick and NES/SNES/PSX pad support via parallel port (up to 5 devices per port) Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> See also Documentation/input/joystick-parport.txt gamma= [HW,DRM] |
aaf230424 x86: disable the ... |
758 759 760 |
gart_fix_e820= [X86_64] disable the fix e820 for K8 GART Format: off | on default: on |
2521f2c22 gcov: add gcov pr... |
761 762 763 764 765 |
gcov_persist= [GCOV] When non-zero (default), profiling data for kernel modules is saved and remains accessible via debugfs, even when the module is unloaded/reloaded. When zero, profiling data is discarded and associated debugfs files are removed at module unload time. |
1da177e4c Linux-2.6.12-rc2 |
766 767 768 769 770 |
gdth= [HW,SCSI] See header of drivers/scsi/gdth.c. gpt [EFI] Forces disk with valid GPT signature but invalid Protective MBR to be treated as GPT. |
1da177e4c Linux-2.6.12-rc2 |
771 772 773 774 |
gvp11= [HW,SCSI] hashdist= [KNL,NUMA] Large hashes allocated during boot are distributed across NUMA nodes. Defaults on |
429aa0fca doc: hashdist def... |
775 |
for 64bit NUMA, off otherwise. |
a99130449 [PATCH] kernel-pa... |
776 |
Format: 0 | 1 (for off | on) |
1da177e4c Linux-2.6.12-rc2 |
777 778 779 780 781 |
hcl= [IA-64] SGI's Hardware Graph compatibility layer hd= [EIDE] (E)IDE hard drive subsystem geometry Format: <cyl>,<head>,<sect> |
1da177e4c Linux-2.6.12-rc2 |
782 783 784 785 |
highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact size of <nn>. This works even on boxes that have no highmem otherwise. This also works to reduce highmem size on bigger boxes. |
54cdfdb47 [PATCH] hrtimers:... |
786 787 788 |
highres= [KNL] Enable/disable high resolution timer mode. Valid parameters: "on", "off" Default: "on" |
1da177e4c Linux-2.6.12-rc2 |
789 790 |
hisax= [HW,ISDN] See Documentation/isdn/README.HiSax. |
0cb55ad2a docs: alphabetize... |
791 792 793 794 795 796 797 798 799 |
hlt [BUGS=ARM,SH] hpet= [X86-32,HPET] option to control HPET usage Format: { enable (default) | disable | force | verbose } disable: disable HPET and use PIT instead force: allow force enabled of undocumented chips (ICH4, VIA, nVidia) verbose: show contents of HPET registers during setup |
b4718e628 x86: add hugepage... |
800 801 |
hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot. hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages. |
0d9ea7544 powerpc: support ... |
802 803 804 805 806 |
On x86-64 and powerpc, this option can be specified multiple times interleaved with hugepages= to reserve huge pages of different sizes. Valid pages sizes on x86-64 are 2M (when the CPU supports "pse") and 1G (when the CPU supports the "pdpe1gb" cpuinfo flag) |
b4718e628 x86: add hugepage... |
807 808 |
Note that 1GB pages can only be allocated at boot time using hugepages= and not freed afterwards. |
6902aa84f doc: Add remainin... |
809 |
|
555d61d65 [S390] update doc... |
810 811 |
hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC) terminal devices. Valid values: 0..8 |
431429ff7 [S390] hvc_iucv: ... |
812 813 814 |
hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs. If specified, z/VM IUCV HVC accepts connections from listed z/VM user IDs only. |
cef7125de [S390] provide do... |
815 |
|
3a853fb93 ARM: OMAP: Add co... |
816 |
i2c_bus= [HW] Override the default board specific I2C bus speed |
7954763bb ARM: OMAP: Add me... |
817 818 |
or register an additional I2C bus that is not registered from board initialization code. |
3a853fb93 ARM: OMAP: Add co... |
819 820 |
Format: <bus_id>,<clkrate> |
36d957392 Input: document i... |
821 |
i8042.debug [HW] Toggle i8042 debug mode |
1da177e4c Linux-2.6.12-rc2 |
822 |
i8042.direct [HW] Put keyboard port into non-translated mode |
84eb8d060 Fix "can not" in ... |
823 824 |
i8042.dumbkbd [HW] Pretend that controller can only read data from keyboard and cannot control its state |
1da177e4c Linux-2.6.12-rc2 |
825 826 |
(Don't attempt to blink the leds) i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
945ef0d42 Input: i8042 - ad... |
827 |
i8042.nokbd [HW] Don't check/create keyboard port |
75d08c789 Input: document i... |
828 829 |
i8042.noloop [HW] Disable the AUX Loopback command while probing for the AUX port |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 833 834 835 836 837 838 839 840 |
i8042.nomux [HW] Don't check presence of an active multiplexing controller i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX controllers i8042.panicblink= [HW] Frequency with which keyboard LEDs should blink when kernel panics (default is 0.5 sec) i8042.reset [HW] Reset the controller during init and cleanup i8042.unlock [HW] Unlock (ignore) the keylock i810= [HW,DRM] |
e70c9d5e6 [PATCH] I8K: use ... |
841 842 843 |
i8k.ignore_dmi [HW] Continue probing hardware even if DMI data indicates that the driver is running on unsupported hardware. |
1da177e4c Linux-2.6.12-rc2 |
844 845 846 847 848 849 850 851 852 853 854 855 856 |
i8k.force [HW] Activate i8k driver even if SMM BIOS signature does not match list of supported models. i8k.power_status [HW] Report power status in /proc/i8k (disabled by default) i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN capability is set. ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter See Documentation/mca.txt. icn= [HW,ISDN] Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
0af80c04e ide: ide.c 'clear... |
857 858 |
ide-core.nodma= [HW] (E)IDE subsystem Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc |
075affcbe ide: preserve Hos... |
859 860 |
.vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr .cdrom .chs .ignore_cable are additional options |
1c10e9382 ide: update refer... |
861 |
See Documentation/ide/ide.txt. |
1da177e4c Linux-2.6.12-rc2 |
862 |
|
0cb55ad2a docs: alphabetize... |
863 864 |
ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem Claim all unknown PCI IDE storage controllers. |
f039b7547 [PATCH] x86: Don'... |
865 |
idle= [X86] |
ada9cfdd1 doc: fix kernel-p... |
866 867 868 869 870 871 872 873 874 875 876 |
Format: idle=poll, idle=mwait, idle=halt, idle=nomwait Poll forces a polling idle loop that can slightly improve the performance of waking up a idle CPU, but will use a lot of power and make the system run hot. Not recommended. idle=mwait: On systems which support MONITOR/MWAIT but the kernel chose to not use it because it doesn't save as much power as a normal idle loop, use the MONITOR/MWAIT idle loop anyways. Performance should be the same as idle=poll. idle=halt: Halt is forced to be used for CPU idle. |
c1e3b377a ACPI: Create "idl... |
877 |
In such case C2/C3 won't be used again. |
ada9cfdd1 doc: fix kernel-p... |
878 |
idle=nomwait: Disable mwait for CPU C-states |
a99130449 [PATCH] kernel-pa... |
879 |
|
792908225 [PATCH] add ignor... |
880 881 882 |
ignore_loglevel [KNL] Ignore loglevel setting - this will print /all/ kernel messages to the console. Useful for debugging. |
1da177e4c Linux-2.6.12-rc2 |
883 884 |
ihash_entries= [KNL] Set number of hash buckets for inode cache. |
3323eec92 integrity: IMA as... |
885 886 887 888 889 890 |
ima_audit= [IMA] Format: { "0" | "1" } 0 -- integrity auditing messages. (Default) 1 -- enable informational integrity auditing messages. ima_hash= [IMA] |
a9ed83a58 trivial: typo in ... |
891 |
Format: { "sha1" | "md5" } |
3323eec92 integrity: IMA as... |
892 |
default: "sha1" |
5789ba3bd IMA: Minimal IMA ... |
893 894 895 896 897 |
ima_tcb [IMA] Load a policy which meets the needs of the Trusted Computing Base. This means IMA will measure all programs exec'd, files mmap'd for exec, and all files opened for read by uid=0. |
1da177e4c Linux-2.6.12-rc2 |
898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 |
in2000= [HW,SCSI] See header of drivers/scsi/in2000.c. init= [KNL] Format: <full_path> Run specified binary instead of /sbin/init as init process. initcall_debug [KNL] Trace initcalls as they are executed. Useful for working out where the kernel is dying during startup. initrd= [BOOT] Specify the location of the initial ramdisk inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver Format: <irq> |
ba3959276 Intel IOMMU: Inte... |
914 |
intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option |
0cd5c3c80 x86: disable inte... |
915 916 |
on Enable intel iommu driver. |
ba3959276 Intel IOMMU: Inte... |
917 918 919 920 921 922 923 924 |
off Disable intel iommu driver. igfx_off [Default Off] By default, gfx is mapped as normal device. If a gfx device has a dedicated DMAR unit, the DMAR unit is bypassed by not enabling DMAR with this option. In this case, gfx device will use physical address for DMA. |
7d3b03ce7 Intel IOMMU: Inte... |
925 926 927 928 929 930 931 |
forcedac [x86_64] With this option iommu will not optimize to look for io virtual address below 32 bit forcing dual address cycle on pci bus for cards supporting greater than 32 bit addressing. The default is to look for translation below 32 bit and if not available then look in the higher range. |
5e0d2a6fc PCI: iommu: iotlb... |
932 933 934 935 |
strict [Default Off] With this option on every unmap_single operation will result in a hardware IOTLB flush operation as opposed to batching them for performance. |
ba3959276 Intel IOMMU: Inte... |
936 |
|
0cb55ad2a docs: alphabetize... |
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 |
inttest= [IA64] iomem= Disable strict checking of access to MMIO memory strict regions from userspace. relaxed iommu= [x86] off force noforce biomerge panic nopanic merge nomerge forcesac soft |
4ed0d3e6c Intel IOMMU Pass ... |
954 |
pt [x86, IA64] |
0cb55ad2a docs: alphabetize... |
955 956 957 958 |
io7= [HW] IO7 for Marvel based alpha systems See comment before marvel_specify_io7 in arch/alpha/kernel/core_marvel.c. |
6cececfce x86, documentatio... |
959 |
io_delay= [X86] I/O delay method |
6e7c40259 x86: various chan... |
960 961 962 963 |
0x80 Standard port 0x80 based delay 0xed Alternate port 0xed based delay (needed on some systems) |
b02aae9cf x86: provide a DM... |
964 |
udelay |
6e7c40259 x86: various chan... |
965 966 967 |
Simple two microseconds delay none No delay |
b02aae9cf x86: provide a DM... |
968 |
|
1da177e4c Linux-2.6.12-rc2 |
969 |
ip= [IP_PNP] |
dc7a08166 nfs: new subdir D... |
970 |
See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4c Linux-2.6.12-rc2 |
971 972 |
ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
c8facbb62 various doc/kerne... |
973 974 |
See comment before ip2_setup() in drivers/char/ip2/ip2base.c. |
1da177e4c Linux-2.6.12-rc2 |
975 976 977 |
ips= [HW,SCSI] Adaptec / IBM ServeRAID controller See header of drivers/scsi/ips.c. |
200803dfe [PATCH] irqpoll |
978 979 980 981 982 983 984 985 986 987 |
irqfixup [HW] When an interrupt is not handled search all handlers for it. Intended to get systems with badly broken firmware running. irqpoll [HW] When an interrupt is not handled search all handlers for it. Also check all handlers each timer interrupt. Intended to get systems with badly broken firmware running. |
1da177e4c Linux-2.6.12-rc2 |
988 |
isapnp= [ISAPNP] |
a99130449 [PATCH] kernel-pa... |
989 |
Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
1da177e4c Linux-2.6.12-rc2 |
990 991 |
isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
22f2e2801 [PATCH] get_optio... |
992 993 994 |
Format: <cpu number>,...,<cpu number> or |
b225d44e2 Documentation/ker... |
995 996 |
<cpu number>-<cpu number> (must be a positive range in ascending order) |
22f2e2801 [PATCH] get_optio... |
997 998 |
or a mixture <cpu number>,...,<cpu number>-<cpu number> |
b225d44e2 Documentation/ker... |
999 |
|
1da177e4c Linux-2.6.12-rc2 |
1000 1001 |
This option can be used to specify one or more CPUs to isolate from the general SMP balancing and scheduling |
b225d44e2 Documentation/ker... |
1002 1003 |
algorithms. You can move a process onto or off an "isolated" CPU via the CPU affinity syscalls or cpuset. |
1da177e4c Linux-2.6.12-rc2 |
1004 1005 1006 1007 |
<cpu number> begins at 0 and the maximum value is "number of CPUs in system - 1". This option is the preferred way to isolate CPUs. The |
a99130449 [PATCH] kernel-pa... |
1008 1009 1010 |
alternative -- manually setting the CPU mask of all tasks in the system -- can cause problems and suboptimal load balancer performance. |
1da177e4c Linux-2.6.12-rc2 |
1011 |
|
a99130449 [PATCH] kernel-pa... |
1012 |
iucv= [HW,NET] |
1da177e4c Linux-2.6.12-rc2 |
1013 1014 1015 |
js= [HW,JOY] Analog joystick See Documentation/input/joystick.txt. |
0cb55ad2a docs: alphabetize... |
1016 |
keepinitrd [HW,ARM] |
6cececfce x86, documentatio... |
1017 |
kernelcore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
ed7ed3651 handle kernelcore... |
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 |
specifies the amount of memory usable by the kernel for non-movable allocations. The requested amount is spread evenly throughout all nodes in the system. The remaining memory in each node is used for Movable pages. In the event, a node is too small to have both kernelcore and Movable pages, kernelcore pages will take priority and other nodes will have a larger number of kernelcore pages. The Movable zone is used for the allocation of pages that may be reclaimed or moved by the page migration subsystem. This means that HugeTLB pages may not be allocated from this zone. Note that allocations like PTEs-from-HighMem still use the HighMem zone if it exists, and the Normal zone if it does not. |
4fe1da4eb echi-dbgp: Add ke... |
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
kgdbdbgp= [KGDB,HW] kgdb over EHCI usb debug port. Format: <Controller#>[,poll interval] The controller # is the number of the ehci usb debug port as it is probed via PCI. The poll interval is optional and is the number seconds in between each poll cycle to the debug port in case you need the functionality for interrupting the kernel with gdb or control-c on the dbgp connection. When not using this parameter you use sysrq-g to break into the kernel debugger. |
84c08fd61 kgdb,docs: Update... |
1042 |
kgdboc= [KGDB,HW] kgdb over consoles. |
ada64e4c9 kgdboc,keyboard: ... |
1043 1044 1045 1046 1047 |
Requires a tty driver that supports console polling, or a supported polling keyboard driver (non-usb). Serial only format: <serial_device>[,baud] keyboard only format: kbd keyboard and serial format: kbd,<serial_device>[,baud] |
6cdf6e06d kgdb: document pa... |
1048 |
|
84c08fd61 kgdb,docs: Update... |
1049 1050 |
kgdbwait [KGDB] Stop kernel execution and enter the kernel debugger at the earliest opportunity. |
9bed90c6a Documentation: Do... |
1051 1052 1053 |
kmac= [MIPS] korina ethernet MAC address. Configure the RouterBoard 532 series on-chip Ethernet adapter MAC address. |
04f70336c kmemleak: Add doc... |
1054 1055 1056 |
kmemleak= [KNL] Boot-time kmemleak enable/disable Valid arguments: on, off Default: on |
6cececfce x86, documentatio... |
1057 |
kstack=N [X86] Print N words from the kernel stack |
0cb55ad2a docs: alphabetize... |
1058 |
in oops dumps. |
fef07aae9 KVM: add module p... |
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 |
kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs. Default is 0 (don't ignore, but inject #GP) kvm.oos_shadow= [KVM] Disable out-of-sync shadow paging. Default is 1 (enabled) kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM. Default is 0 (off) kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU) for all guests. Default is 1 (enabled) if in 64bit or 32bit-PAE mode kvm-intel.bypass_guest_pf= [KVM,Intel] Disables bypassing of guest page faults on Intel chips. Default is 1 (enabled) kvm-intel.ept= [KVM,Intel] Disable extended page tables (virtualized MMU) support on capable Intel chips. Default is 1 (enabled) kvm-intel.emulate_invalid_guest_state= [KVM,Intel] Enable emulation of invalid guest states Default is 0 (disabled) kvm-intel.flexpriority= [KVM,Intel] Disable FlexPriority feature (TPR shadow). Default is 1 (enabled) kvm-intel.unrestricted_guest= [KVM,Intel] Disable unrestricted guest feature (virtualized real and unpaged mode) on capable Intel chips. Default is 1 (enabled) kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification feature (tagged TLBs) on capable Intel chips. Default is 1 (enabled) |
1da177e4c Linux-2.6.12-rc2 |
1096 |
l2cr= [PPC] |
a78bfbfcf [POWERPC] Add ker... |
1097 |
l3cr= [PPC] |
cd4f0ef7c doc/kernel-parame... |
1098 |
lapic [X86-32,APIC] Enable the local APIC even if BIOS |
a99130449 [PATCH] kernel-pa... |
1099 |
disabled it. |
1da177e4c Linux-2.6.12-rc2 |
1100 |
|
6cececfce x86, documentatio... |
1101 |
lapic_timer_c2_ok [X86,APIC] trust the local apic timer |
ada9cfdd1 doc: fix kernel-p... |
1102 |
in C2 power state. |
e585bef81 [PATCH] i386: add... |
1103 |
|
fcb71f6f0 Update kernel par... |
1104 1105 1106 1107 1108 1109 1110 |
libata.dma= [LIBATA] DMA control libata.dma=0 Disable all PATA and SATA DMA libata.dma=1 PATA and SATA Disk DMA only libata.dma=2 ATAPI (CDROM) DMA only libata.dma=4 Compact Flash DMA only Combinations also work, so libata.dma=3 enables DMA for disks and CDROMs, but not CFs. |
203088715 Documentation/ker... |
1111 1112 1113 1114 |
libata.ignore_hpa= [LIBATA] Ignore HPA limit libata.ignore_hpa=0 keep BIOS limits (default) libata.ignore_hpa=1 ignore limits, using full disk |
fcb71f6f0 Update kernel par... |
1115 |
|
78e70c237 libata: correct k... |
1116 1117 1118 |
libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume when set. Format: <int> |
332673257 libata: implement... |
1119 1120 |
libata.force= [LIBATA] Force configurations. The format is comma separated list of "[ID:]VAL" where ID is |
4c44f309c libata: fix docs,... |
1121 |
PORT[.DEVICE]. PORT and DEVICE are decimal numbers |
332673257 libata: implement... |
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 |
matching port, link or device. Basically, it matches the ATA ID string printed on console by libata. If the whole ID part is omitted, the last PORT and DEVICE values are used. If ID hasn't been specified yet, the configuration applies to all ports, links and devices. If only DEVICE is omitted, the parameter applies to the port and all links and devices behind it. DEVICE number of 0 either selects the first device or the first fan-out link behind PMP device. It does not select the host link. DEVICE number of 15 selects the host link and device attached to it. The VAL specifies the configuration to force. As long as there's no ambiguity shortcut notation is allowed. For example, both 1.5 and 1.5G would work for 1.5Gbps. The following configurations can be forced. * Cable type: 40c, 80c, short40c, unk, ign or sata. Any ID with matching PORT is used. * SATA link speed limit: 1.5Gbps or 3.0Gbps. * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7]. udma[/][16,25,33,44,66,100,133] notation is also allowed. * [no]ncq: Turn on or off NCQ. |
05944bdf6 libata: implement... |
1150 1151 |
* nohrst, nosrst, norst: suppress hard, soft and both resets. |
332673257 libata: implement... |
1152 1153 |
If there are multiple matching configurations changing the same attribute, the last one is used. |
7c4be253d docs: add more ea... |
1154 |
lmb=debug [KNL] Enable lmb debug messages. |
1da177e4c Linux-2.6.12-rc2 |
1155 |
load_ramdisk= [RAM] List of ramdisks to load from floppy |
31c00fc15 Create/use more d... |
1156 |
See Documentation/blockdev/ramdisk.txt. |
1da177e4c Linux-2.6.12-rc2 |
1157 |
|
a6b25b675 [PATCH] nlm kerne... |
1158 1159 |
lockd.nlm_grace_period=P [NFS] Assign grace period. Format: <integer> |
1da177e4c Linux-2.6.12-rc2 |
1160 |
|
a6b25b675 [PATCH] nlm kerne... |
1161 1162 1163 1164 1165 1166 1167 1168 |
lockd.nlm_tcpport=N [NFS] Assign TCP port. Format: <integer> lockd.nlm_timeout=T [NFS] Assign timeout value. Format: <integer> lockd.nlm_udpport=M [NFS] Assign UDP port. Format: <integer> |
1da177e4c Linux-2.6.12-rc2 |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver Format: <irq> loglevel= All Kernel Messages with a loglevel smaller than the console loglevel will be printed to the console. It can also be changed with klogd or other programs. The loglevels are defined as follows: 0 (KERN_EMERG) system is unusable 1 (KERN_ALERT) action must be taken immediately 2 (KERN_CRIT) critical conditions 3 (KERN_ERR) error conditions 4 (KERN_WARNING) warning conditions 5 (KERN_NOTICE) normal but significant condition 6 (KERN_INFO) informational 7 (KERN_DEBUG) debug-level messages log_buf_len=n Sets the size of the printk ring buffer, in bytes. |
a99130449 [PATCH] kernel-pa... |
1188 1189 1190 |
Format: { n | nk | nM } n must be a power of two. The default size is set in the kernel config file. |
1da177e4c Linux-2.6.12-rc2 |
1191 |
|
accaa24c4 fbcon: logo: disa... |
1192 1193 1194 1195 |
logo.nologo [FB] Disables display of the built-in Linux logo. This may be used to provide more screen space for kernel log messages and is useful when debugging kernel boot problems. |
1da177e4c Linux-2.6.12-rc2 |
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 |
lp=0 [LP] Specify parallel ports to use, e.g, lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses lp=reset first parallel port). 'lp=0' disables the lp=auto printer driver. 'lp=reset' (which can be specified in addition to the ports) causes attached printers to be reset. Using lp=port1,port2,... specifies the parallel ports to associate lp devices with, starting with lp0. A port specification may be 'none' to skip that lp device, or a parport name such as 'parport0'. Specifying 'lp=auto' instead of a port specification list means that device IDs from each port should be examined, to see if an IEEE 1284-compliant printer is attached; if so, the driver will manage that printer. See also header of drivers/char/lp.c. lpj=n [KNL] Sets loops_per_jiffy to given constant, thus avoiding time-consuming boot-time autodetection (up to 250 ms per CPU). 0 enables autodetection (default). To determine the correct value for your kernel, boot with normal autodetection and see what value is printed. Note that on SMP systems the preset will be applied to all CPUs, which is likely to cause problems if your CPUs need significantly divergent settings. An incorrect value will cause delays in the kernel to be wrong, leading to unpredictable I/O errors and other breakage. Although unlikely, in the extreme case this might damage your hardware. ltpc= [NET] Format: <io>,<irq>,<dma> |
a99130449 [PATCH] kernel-pa... |
1229 1230 |
mac5380= [HW,SCSI] Format: <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
1da177e4c Linux-2.6.12-rc2 |
1231 |
|
a99130449 [PATCH] kernel-pa... |
1232 1233 1234 |
machvec= [IA64] Force the use of a particular machine-vector (machvec) in a generic kernel. Example: machvec=hpzx1_swiotlb |
1da177e4c Linux-2.6.12-rc2 |
1235 |
|
3209e70e5 MIPS: Loongson: A... |
1236 1237 1238 |
machtype= [Loongson] Share the same kernel image file between different yeeloong laptop. Example: machtype=lemote-yeeloong-2f-7inch |
0cb55ad2a docs: alphabetize... |
1239 1240 |
max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater than or equal to this physical address is ignored. |
1da177e4c Linux-2.6.12-rc2 |
1241 1242 |
maxcpus= [SMP] Maximum number of processors that an SMP kernel |
61ec7567d ACPI: boot correc... |
1243 1244 1245 1246 |
should make use of. maxcpus=n : n >= 0 limits the kernel to using 'n' processors. n=0 is a special case, it is equivalent to "nosmp", which also disables the IO APIC. |
1da177e4c Linux-2.6.12-rc2 |
1247 |
|
0cb55ad2a docs: alphabetize... |
1248 1249 1250 |
max_loop= [LOOP] Maximum number of loopback devices that can be mounted Format: <1-256> |
2b2c37503 [PATCH] Documenta... |
1251 |
|
a99130449 [PATCH] kernel-pa... |
1252 |
max_luns= [SCSI] Maximum number of LUNs to probe. |
1da177e4c Linux-2.6.12-rc2 |
1253 1254 1255 |
Should be between 1 and 2^32-1. max_report_luns= |
a99130449 [PATCH] kernel-pa... |
1256 |
[SCSI] Maximum number of LUNs received. |
1da177e4c Linux-2.6.12-rc2 |
1257 |
Should be between 1 and 16384. |
1da177e4c Linux-2.6.12-rc2 |
1258 |
mcatest= [IA-64] |
cd4f0ef7c doc/kernel-parame... |
1259 |
mce [X86-32] Machine Check Exception |
1da177e4c Linux-2.6.12-rc2 |
1260 |
|
71cced6eb doc/x86: fix doc ... |
1261 |
mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt |
909dd324f x86: clean up mce... |
1262 |
|
1da177e4c Linux-2.6.12-rc2 |
1263 1264 |
md= [HW] RAID subsystems devices and level See Documentation/md.txt. |
a99130449 [PATCH] kernel-pa... |
1265 |
|
1da177e4c Linux-2.6.12-rc2 |
1266 1267 1268 |
mdacon= [MDA] Format: <first>,<last> Specifies range of consoles to be captured by the MDA. |
a99130449 [PATCH] kernel-pa... |
1269 |
|
1da177e4c Linux-2.6.12-rc2 |
1270 1271 1272 |
mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory Amount of memory to be used when the kernel is not able to see the whole system memory or for test. |
cd4f0ef7c doc/kernel-parame... |
1273 |
[X86-32] Use together with memmap= to avoid physical |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 |
address space collisions. Without memmap= PCI devices could be placed at addresses belonging to unused RAM. |
cd4f0ef7c doc/kernel-parame... |
1276 |
mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel |
1da177e4c Linux-2.6.12-rc2 |
1277 |
memory. |
6902aa84f doc: Add remainin... |
1278 1279 1280 |
memchunk=nn[KMG] [KNL,SH] Allow user to override the default size for per-device physically contiguous DMA buffers. |
6cececfce x86, documentatio... |
1281 |
memmap=exactmap [KNL,X86] Enable setting of an exact |
1da177e4c Linux-2.6.12-rc2 |
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 |
E820 memory map, as specified by the user. Such memmap=exactmap lines can be constructed based on BIOS output or other requirements. See the memmap=nn@ss option description. memmap=nn[KMG]@ss[KMG] [KNL] Force usage of a specific region of memory Region of memory to be used, from ss to ss+nn. memmap=nn[KMG]#ss[KMG] [KNL,ACPI] Mark specific memory as ACPI data. Region of memory to be used, from ss to ss+nn. memmap=nn[KMG]$ss[KMG] [KNL,ACPI] Mark specific memory as reserved. Region of memory to be used, from ss to ss+nn. |
1312848e9 kernel-parameters... |
1298 1299 1300 1301 |
Example: Exclude memory from 0x18690000-0x1869ffff memmap=64K$0x18690000 or memmap=0x10000$0x18690000 |
1da177e4c Linux-2.6.12-rc2 |
1302 |
|
9f077871c x86: clean up mem... |
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 |
memory_corruption_check=0/1 [X86] Some BIOSes seem to corrupt the first 64k of memory when doing things like suspend/resume. Setting this option will scan the memory looking for corruption. Enabling this will both detect corruption and prevent the kernel from using the memory being corrupted. However, its intended as a diagnostic tool; if repeatable BIOS-originated corruption always affects the same memory, you can use memmap= to prevent the kernel from using that memory. memory_corruption_check_size=size [X86] By default it checks for corruption in the low 64k, making this memory unavailable for normal use. Use this parameter to scan for corruption in more or less memory. memory_corruption_check_period=seconds [X86] By default it checks for corruption every 60 seconds. Use this parameter to check at some other rate. 0 disables periodic checking. |
caadbdce2 x86: enable memor... |
1325 |
memtest= [KNL,X86] Enable memtest |
c64df7079 x86: memtest boot... |
1326 |
Format: <integer> |
c64df7079 x86: memtest boot... |
1327 |
default : 0 <disable> |
9e5f6cf5f x86: update descr... |
1328 1329 1330 1331 1332 1333 |
Specifies the number of memtest passes to be performed. Each pass selects another test pattern from a given set of patterns. Memtest fills the memory with this pattern, validates memory contents and reserves bad memory regions that are detected. |
c64df7079 x86: memtest boot... |
1334 |
|
1da177e4c Linux-2.6.12-rc2 |
1335 1336 |
meye.*= [HW] Set MotionEye Camera parameters See Documentation/video4linux/meye.txt. |
8f36881b3 x86: Geode MFGPT ... |
1337 1338 1339 |
mfgpt_irq= [IA-32] Specify the IRQ to use for the Multi-Function General Purpose Timers on AMD Geode platforms. |
e6c4dc6c3 x86: GEODE add th... |
1340 1341 1342 1343 |
mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when the BIOS has incorrectly applied a workaround. TinyBIOS version 0.98 is known to be affected, 0.99 fixes the problem by letting the user disable the workaround. |
1da177e4c Linux-2.6.12-rc2 |
1344 |
mga= [HW,DRM] |
1c207f952 Documentation/ker... |
1345 1346 |
min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this physical address is ignored. |
39f45d7bc [ARM] MINI2440: D... |
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 |
mini2440= [ARM,HW,KNL] Format:[0..2][b][c][t] Default: "0tb" MINI2440 configuration specification: 0 - The attached screen is the 3.5" TFT 1 - The attached screen is the 7" TFT 2 - The VGA Shield is attached (1024x768) Leaving out the screen size parameter will not load the TFT driver, and the framebuffer will be left unconfigured. b - Enable backlight. The TFT backlight pin will be linked to the kernel VESA blanking code and a GPIO LED. This parameter is not necessary when using the VGA shield. c - Enable the s3c camera interface. t - Reserved for enabling touchscreen support. The touchscreen support is not enabled in the mainstream kernel as of 2.6.30, a preliminary port can be found in the "bleeding edge" mini2440 support kernel at http://repo.or.cz/w/linux-2.6/mini2440.git |
6b74ab97b mm: add a basic d... |
1367 1368 1369 1370 1371 1372 1373 |
mminit_loglevel= [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this parameter allows control of the logging verbosity for the additional memory initialisation checks. A value of 0 disables mminit logging and a level of 4 will log everything. Information is printed at KERN_DEBUG so loglevel=8 may also need to be specified. |
1da177e4c Linux-2.6.12-rc2 |
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 |
mousedev.tap_time= [MOUSE] Maximum time between finger touching and leaving touchpad surface for touch to be considered a tap and be reported as a left button click (for touchpads working in absolute mode only). Format: <msecs> mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices reporting absolute coordinates, such as tablets mousedev.yres= [MOUSE] Vertical screen resolution, used for devices reporting absolute coordinates, such as tablets |
6cececfce x86, documentatio... |
1384 |
movablecore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
0cb55ad2a docs: alphabetize... |
1385 1386 1387 1388 1389 1390 1391 1392 |
is similar to kernelcore except it specifies the amount of memory used for migratable allocations. If both kernelcore and movablecore is specified, then kernelcore will be at *least* the specified value but may be more. If movablecore on its own is specified, the administrator must be careful that the amount of memory usable for all allocations is not too small. |
1da177e4c Linux-2.6.12-rc2 |
1393 1394 1395 1396 1397 |
mpu401= [HW,OSS] Format: <io>,<irq> MTD_Partition= [MTD] Format: <name>,<region-number>,<size>,<offset> |
a99130449 [PATCH] kernel-pa... |
1398 1399 |
MTD_Region= [MTD] Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
1da177e4c Linux-2.6.12-rc2 |
1400 1401 |
mtdparts= [MTD] |
c8facbb62 various doc/kerne... |
1402 |
See drivers/mtd/cmdlinepart.c. |
1da177e4c Linux-2.6.12-rc2 |
1403 |
|
5988af231 mtd: Flex-OneNAND... |
1404 1405 1406 1407 1408 1409 1410 1411 1412 |
onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration Format: [die0_boundary][,die0_lock][,die1_boundary][,die1_lock] boundary - index of last SLC block on Flex-OneNAND. The remaining blocks are configured as MLC blocks. lock - Configure if Flex-OneNAND boundary should be locked. Once locked, the boundary cannot be changed. 1 indicates lock status, 0 indicates unlock status. |
9db829f48 [ARM] JIVE: Initi... |
1413 1414 1415 1416 |
mtdset= [ARM] ARM/S3C2412 JIVE boot control See arch/arm/mach-s3c2412/mach-jive.c |
1da177e4c Linux-2.6.12-rc2 |
1417 |
mtouchusb.raw_coordinates= |
a99130449 [PATCH] kernel-pa... |
1418 1419 |
[HW] Make the MicroTouch USB driver use raw coordinates ('y', default) or cooked coordinates ('n') |
1da177e4c Linux-2.6.12-rc2 |
1420 |
|
0cb55ad2a docs: alphabetize... |
1421 |
mtrr_chunk_size=nn[KMG] [X86] |
19f594600 trivial: Miscella... |
1422 |
used for mtrr cleanup. It is largest continuous chunk |
0cb55ad2a docs: alphabetize... |
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 |
that could hold holes aka. UC entries. mtrr_gran_size=nn[KMG] [X86] Used for mtrr cleanup. It is granularity of mtrr block. Default is 1. Large value could prevent small alignment from using up MTRRs. mtrr_spare_reg_nr=n [X86] Format: <integer> Range: 0,7 : spare reg number Default : 1 Used for mtrr cleanup. It is spare mtrr entries number. Set to 2 or more if your graphical card needs more. |
1da177e4c Linux-2.6.12-rc2 |
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 |
n2= [NET] SDL Inc. RISCom/N2 synchronous serial card NCR_D700= [HW,SCSI] See header of drivers/scsi/NCR_D700.c. ncr5380= [HW,SCSI] ncr53c400= [HW,SCSI] ncr53c400a= [HW,SCSI] ncr53c406a= [HW,SCSI] ncr53c8xx= [HW,SCSI] netdev= [NET] Network devices parameters Format: <irq>,<io>,<mem_start>,<mem_end>,<name> Note that mem_start is often overloaded to mean something different and driver-specific. |
a99130449 [PATCH] kernel-pa... |
1456 1457 |
This usage is only documented in each driver source file if at all. |
584015727 netfilter: accoun... |
1458 1459 1460 1461 1462 1463 |
nf_conntrack.acct= [NETFILTER] Enable connection tracking flow accounting 0 to disable accounting 1 to enable accounting Default value depends on CONFIG_NF_CT_ACCT that is going to be removed in 2.6.29. |
1da177e4c Linux-2.6.12-rc2 |
1464 |
nfsaddrs= [NFS] |
dc7a08166 nfs: new subdir D... |
1465 |
See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4c Linux-2.6.12-rc2 |
1466 1467 |
nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
dc7a08166 nfs: new subdir D... |
1468 |
See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4c Linux-2.6.12-rc2 |
1469 |
|
a72b44222 NFSv4: Allow user... |
1470 1471 1472 |
nfs.callback_tcpport= [NFS] set the TCP port on which the NFSv4 callback channel should listen. |
e571cbf1a NFS: Add a dns re... |
1473 1474 1475 1476 1477 1478 1479 |
nfs.cache_getent= [NFS] sets the pathname to the program which is used to update the NFS client cache entries. nfs.cache_getent_timeout= [NFS] sets the timeout after which an attempt to update a cache entry is deemed to have failed. |
58df095b7 NFSv4: Allow entr... |
1480 1481 1482 |
nfs.idmap_cache_timeout= [NFS] set the maximum lifetime for idmapper cache entries. |
f43bf0beb NFS: Add a boot p... |
1483 1484 1485 1486 1487 1488 |
nfs.enable_ino64= [NFS] enable 64-bit inode numbers. If zero, the NFS client will fake up a 32-bit inode number for the readdir() and stat() syscalls instead of returning the full 64-bit number. The default is to return 64-bit inode numbers. |
1e1030dcc sh: nmi_debug sup... |
1489 |
nmi_debug= [KNL,AVR32,SH] Specify one or more actions to take |
e7ba176b4 [AVR32] NMI debug... |
1490 1491 |
when a NMI is triggered. Format: [state][,regs][,debounce][,die] |
6cececfce x86, documentatio... |
1492 |
nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels |
5b9a0e14e x86: nmi - nmi_wa... |
1493 1494 1495 1496 1497 |
Format: [panic,][num] Valid num: 0,1,2 0 - turn nmi_watchdog off 1 - use the IO-APIC timer for the NMI watchdog 2 - use the local APIC for the NMI watchdog using |
0cb55ad2a docs: alphabetize... |
1498 1499 1500 1501 1502 1503 1504 |
a performance counter. Note: This will use one performance counter and the local APIC's performance vector. When panic is specified, panic when an NMI watchdog timeout occurs. This is useful when you use a panic=... timeout and need the box quickly up again. |
5b9a0e14e x86: nmi - nmi_wa... |
1505 1506 1507 |
Instead of 1 and 2 it is possible to use the following symbolic names: lapic and ioapic Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic |
1da177e4c Linux-2.6.12-rc2 |
1508 |
|
bff38771e netpoll: Introduc... |
1509 1510 1511 1512 |
netpoll.carrier_timeout= [NET] Specifies amount of time (in seconds) that netpoll should wait for a carrier. By default netpoll waits 4 seconds. |
cd4f0ef7c doc/kernel-parame... |
1513 |
no387 [BUGS=X86-32] Tells the kernel to use the 387 maths |
1da177e4c Linux-2.6.12-rc2 |
1514 1515 |
emulation library even if a 387 maths coprocessor is present. |
0cb55ad2a docs: alphabetize... |
1516 1517 1518 1519 1520 1521 1522 1523 1524 |
no_console_suspend [HW] Never suspend the console Disable suspending of consoles during suspend and hibernate operations. Once disabled, debugging messages can reach various consoles while the rest of the system is being put to sleep (ie, while debugging driver suspend/resume hooks). This may not work reliably with all consoles, but is known to work with serial and VGA consoles. |
c1aee215d SLUB: More docume... |
1525 1526 1527 |
noaliencache [MM, NUMA, SLAB] Disables the allocation of alien caches in the slab allocator. Saves per-node memory, but will impact performance. |
3395ee058 [PATCH] mm: add n... |
1528 |
|
a99130449 [PATCH] kernel-pa... |
1529 |
noalign [KNL,ARM] |
1da177e4c Linux-2.6.12-rc2 |
1530 1531 |
noapic [SMP,APIC] Tells the kernel to not make use of any IOAPICs that may be present in the system. |
1da177e4c Linux-2.6.12-rc2 |
1532 1533 1534 1535 |
nobats [PPC] Do not use BATs for mapping kernel lowmem on "Classic" PPC cores. nocache [ARM] |
a99130449 [PATCH] kernel-pa... |
1536 |
|
0cb55ad2a docs: alphabetize... |
1537 |
noclflush [BUGS=X86] Don't use the CLFLUSH instruction |
163ecdff0 [PATCH] delay acc... |
1538 |
nodelayacct [KNL] Disable per-task delay accounting |
1da177e4c Linux-2.6.12-rc2 |
1539 |
nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
6902aa84f doc: Add remainin... |
1540 |
nodsp [SH] Disable hardware DSP at boot time. |
6cececfce x86, documentatio... |
1541 |
noefi [X86] Disable EFI runtime services support. |
8b2cb7a8f x86: 32-bit EFI r... |
1542 |
|
1da177e4c Linux-2.6.12-rc2 |
1543 |
noexec [IA-64] |
6cececfce x86, documentatio... |
1544 |
noexec [X86] |
f5a1b191b x86: fix exec map... |
1545 |
On X86-32 available only on PAE configured kernels. |
1da177e4c Linux-2.6.12-rc2 |
1546 |
noexec=on: enable non-executable mappings (default) |
f5a1b191b x86: fix exec map... |
1547 1548 1549 1550 1551 1552 1553 1554 |
noexec=off: disable non-executable mappings noexec32 [X86-64] This affects only 32-bit executables. noexec32=on: enable non-executable mappings (default) read doesn't imply executable mappings noexec32=off: disable non-executable mappings read implies executable mappings |
1da177e4c Linux-2.6.12-rc2 |
1555 |
|
6902aa84f doc: Add remainin... |
1556 |
nofpu [SH] Disable hardware FPU at boot time. |
cd4f0ef7c doc/kernel-parame... |
1557 |
nofxsr [BUGS=X86-32] Disables x86 floating point extended |
4f8865112 [PATCH] i386: all... |
1558 1559 |
register save and restore. The kernel will only save legacy floating-point registers on task switch. |
1da177e4c Linux-2.6.12-rc2 |
1560 |
|
0c752a933 x86: introduce no... |
1561 1562 1563 |
noxsave [BUGS=X86] Disables x86 extended register state save and restore using xsave. The kernel will fallback to enabling legacy floating-point and sse state. |
01a24d2b9 [ARM] 5437/1: Add... |
1564 1565 1566 |
nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or wfi(ARM) instruction doesn't work correctly and not to use it. This is also useful when using JTAG debugger. |
a99130449 [PATCH] kernel-pa... |
1567 |
|
cd4f0ef7c doc/kernel-parame... |
1568 |
no-hlt [BUGS=X86-32] Tells the kernel that the hlt |
1da177e4c Linux-2.6.12-rc2 |
1569 1570 |
instruction doesn't work correctly and not to use it. |
1f29fae29 file capabilities... |
1571 1572 1573 |
no_file_caps Tells the kernel not to honor file capabilities. The only way then for a file to be executed with privilege is to be setuid root or executed by root. |
1da177e4c Linux-2.6.12-rc2 |
1574 1575 1576 1577 1578 1579 |
nohalt [IA-64] Tells the kernel not to use the power saving function PAL_HALT_LIGHT when idle. This increases power-consumption. On the positive side, it reduces interrupt wake-up latency, which may improve performance in certain environments such as networked servers or real-time systems. |
79bf2bb33 [PATCH] tick-mana... |
1580 1581 1582 |
nohz= [KNL] Boottime enable/disable dynamic ticks Valid arguments: on, off Default: on |
eeee7853c sh: Add a command... |
1583 |
noiotrap [SH] Disables trapped I/O port accesses. |
cd4f0ef7c doc/kernel-parame... |
1584 |
noirqdebug [X86-32] Disables the code which attempts to detect and |
1da177e4c Linux-2.6.12-rc2 |
1585 |
disable unhandled interrupt sources. |
6cececfce x86, documentatio... |
1586 |
no_timer_check [X86,APIC] Disables the code which tests for |
8542b200c [PATCH] paravirt:... |
1587 |
broken timer IRQ sources. |
1da177e4c Linux-2.6.12-rc2 |
1588 1589 1590 1591 |
noisapnp [ISAPNP] Disables ISA PnP code. noinitrd [RAM] Tells the kernel not to load any configured initial RAM disk. |
03ea81550 x86, intr-remap: ... |
1592 1593 |
nointremap [X86-64, Intel-IOMMU] Do not enable interrupt remapping. |
1da177e4c Linux-2.6.12-rc2 |
1594 |
nointroute [IA-64] |
0aa366f35 [IA64] Convert to... |
1595 |
nojitter [IA64] Disables jitter checking for ITC timers. |
cd4f0ef7c doc/kernel-parame... |
1596 |
nolapic [X86-32,APIC] Do not enable or use the local APIC. |
1da177e4c Linux-2.6.12-rc2 |
1597 |
|
cd4f0ef7c doc/kernel-parame... |
1598 |
nolapic_timer [X86-32,APIC] Do not use the local APIC timer. |
ad62ca2bd [PATCH] i386: dis... |
1599 |
|
1da177e4c Linux-2.6.12-rc2 |
1600 1601 |
noltlbs [PPC] Do not use large page/tlb entries for kernel lowmem mapping on PPC40x. |
312f1f014 [IA64] Document t... |
1602 |
nomca [IA-64] Disable machine check abort handling |
cd4f0ef7c doc/kernel-parame... |
1603 |
nomce [X86-32] Machine Check Exception |
abe37e5a1 Documentation: Re... |
1604 |
|
83d7384f8 x86: Geode Multi-... |
1605 1606 |
nomfgpt [X86-32] Disable Multi-Function General Purpose Timer usage (for AMD Geode machines). |
016ddd9b5 x86: Put 'nopat' ... |
1607 1608 |
nopat [X86] Disable PAT (page attribute table extension of pagetables) support. |
0cb55ad2a docs: alphabetize... |
1609 1610 |
norandmaps Don't use address space randomization. Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space |
cd4f0ef7c doc/kernel-parame... |
1611 |
noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops |
959b4fdfe [PATCH] i386: PAR... |
1612 |
|
cd4f0ef7c doc/kernel-parame... |
1613 |
noreplace-smp [X86-32,SMP] Don't replace SMP instructions |
b7fb4af06 [PATCH] i386: All... |
1614 |
with UP alternatives |
1da177e4c Linux-2.6.12-rc2 |
1615 |
noresidual [PPC] Don't use residual data on PReP machines. |
a99130449 [PATCH] kernel-pa... |
1616 1617 |
noresume [SWSUSP] Disables resume and restores original swap space. |
1da177e4c Linux-2.6.12-rc2 |
1618 1619 1620 1621 1622 |
no-scroll [VGA] Disables scrollback. This is required for the Braillex ib80-piezo Braille reader made by F.H. Papenmeier (Germany). nosbagart [IA-64] |
cd4f0ef7c doc/kernel-parame... |
1623 |
nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. |
4f8865112 [PATCH] i386: all... |
1624 |
|
61ec7567d ACPI: boot correc... |
1625 1626 |
nosmp [SMP] Tells an SMP kernel to act as a UP kernel, and disable the IO APIC. legacy for "maxcpus=0". |
1da177e4c Linux-2.6.12-rc2 |
1627 |
|
97842216b Allow softlockup ... |
1628 |
nosoftlockup [KNL] Disable the soft-lockup detector. |
c077719be memcg: mem+swap c... |
1629 |
noswapaccount [KNL] Disable accounting of swap in memory resource |
21acb9caa trivial: fix wher... |
1630 |
controller. (See Documentation/cgroups/memory.txt) |
c077719be memcg: mem+swap c... |
1631 |
|
1da177e4c Linux-2.6.12-rc2 |
1632 |
nosync [HW,M68K] Disables sync negotiation for all devices. |
cd4f0ef7c doc/kernel-parame... |
1633 |
notsc [BUGS=X86-32] Disable Time Stamp Counter |
1da177e4c Linux-2.6.12-rc2 |
1634 1635 1636 1637 |
nousb [USB] Disable the USB subsystem nowb [ARM] |
a99130449 [PATCH] kernel-pa... |
1638 |
|
2b2fd87a6 docs, x86: add no... |
1639 |
nox2apic [X86-64,APIC] Do not enable x2APIC mode. |
a6c75b86c [IA64] Kernel par... |
1640 1641 1642 |
nptcg= [IA64] Override max number of concurrent global TLB purges which is reported from either PAL_VM_SUMMARY or SAL PALO. |
2b633e3fa smp: Use nr_cpus=... |
1643 1644 1645 1646 1647 |
nr_cpus= [SMP] Maximum number of processors that an SMP kernel could support. nr_cpus=n : n >= 1 limits the kernel to supporting 'n' processors. Later in runtime you can not use hotplug cpu feature to put more cpu back to online. just like you compile the kernel NR_CPUS=n |
0cb55ad2a docs: alphabetize... |
1648 |
nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
f0c0b2b80 change zonelist o... |
1649 1650 1651 1652 |
numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. one of ['zone', 'node', 'default'] can be specified This can be set from sysctl after boot. See Documentation/sysctl/vm.txt for details. |
7c4be253d docs: add more ea... |
1653 1654 1655 |
ohci1394_dma=early [HW] enable debugging via the ohci1394 driver. See Documentation/debugging-via-ohci1394.txt for more info. |
3ef0e1f8c x86: olpc: add On... |
1656 1657 1658 1659 1660 1661 |
olpc_ec_timeout= [OLPC] ms delay when issuing EC commands Rather than timing out after 20 ms if an EC command is not properly ACKed, override the length of the timeout. We have interrupts disabled while waiting for the ACK, so if this is set too high interrupts *may* be lost! |
15ac7afe5 omap: mux: Add ne... |
1662 1663 1664 1665 |
omap_mux= [OMAP] Override bootloader pin multiplexing. Format: <mux_mode0.mode_name=value>... For example, to override I2C bus2: omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100 |
1da177e4c Linux-2.6.12-rc2 |
1666 1667 |
opl3= [HW,OSS] Format: <io> |
1da177e4c Linux-2.6.12-rc2 |
1668 1669 |
oprofile.timer= [HW] Use timer interrupt instead of performance counters |
7e4e0bd50 oprofile: introdu... |
1670 1671 1672 |
oprofile.cpu_type= Force an oprofile cpu type This might be useful if you have an older oprofile userland or if you want common events. |
8d7ff4f2a x86/oprofile: ren... |
1673 1674 |
Format: { arch_perfmon } arch_perfmon: [X86] Force use of architectural |
7e4e0bd50 oprofile: introdu... |
1675 1676 |
perfmon on Intel CPUs instead of the CPU specific event set. |
1dcdb5a9e oprofile: re-add ... |
1677 |
|
1da177e4c Linux-2.6.12-rc2 |
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 |
osst= [HW,SCSI] SCSI Tape Driver Format: <buffer_size>,<write_threshold> See also Documentation/scsi/st.txt. panic= [KNL] Kernel behaviour on panic Format: <timeout> parkbd.port= [HW] Parallel port number the keyboard adapter is connected to, default is 0. Format: <parport#> parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, 0 for XT, 1 for AT (default is AT). |
a99130449 [PATCH] kernel-pa... |
1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 |
Format: <mode> parport= [HW,PPT] Specify parallel ports. 0 disables. Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } Use 'auto' to force the driver to use any IRQ/DMA settings detected (the default is to ignore detected IRQ/DMA settings because of possible conflicts). You can specify the base address, IRQ, and DMA settings; IRQ and DMA should be numbers, or 'auto' (for using detected settings on that particular port), or 'nofifo' (to avoid using a FIFO even if it is detected). Parallel ports are assigned in the order they are specified on the command line, starting with parport0. parport_init_mode= [HW,PPT] Configure VIA parallel port to operate in a specific mode. This is necessary on Pegasos computer where firmware has no options for setting up parallel port mode and sets it to spp. Currently this function knows 686a and 8231 chips. |
1da177e4c Linux-2.6.12-rc2 |
1712 |
Format: [spp|ps2|epp|ecp|ecpepp] |
a99130449 [PATCH] kernel-pa... |
1713 1714 |
pas2= [HW,OSS] Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> |
1da177e4c Linux-2.6.12-rc2 |
1715 1716 |
pas16= [HW,SCSI] See header of drivers/scsi/pas16.c. |
dd287796d [PATCH] pause_on_... |
1717 1718 1719 1720 |
pause_on_oops= Halt all CPUs after the first oops has been printed for the specified number of seconds. This is to be used if your oopses keep scrolling off the screen. |
1da177e4c Linux-2.6.12-rc2 |
1721 1722 1723 1724 |
pcbit= [HW,ISDN] pcd. [PARIDE] See header of drivers/block/paride/pcd.c. |
31c00fc15 Create/use more d... |
1725 |
See also Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
1726 |
|
a99130449 [PATCH] kernel-pa... |
1727 |
pci=option[,option...] [PCI] various PCI subsystem options: |
1cc0ca26c PCI/x86: document... |
1728 1729 |
earlydump [X86] dump PCI config space before the kernel changes anything |
c01156061 PCI: Document tha... |
1730 |
off [X86] don't probe for the PCI bus |
cd4f0ef7c doc/kernel-parame... |
1731 |
bios [X86-32] force use of PCI BIOS, don't access |
a99130449 [PATCH] kernel-pa... |
1732 1733 |
the hardware directly. Use this if your machine has a non-standard PCI host bridge. |
cd4f0ef7c doc/kernel-parame... |
1734 |
nobios [X86-32] disallow use of PCI BIOS, only direct |
a99130449 [PATCH] kernel-pa... |
1735 1736 1737 |
hardware access methods are allowed. Use this if you experience crashes upon bootup and you suspect they are caused by the BIOS. |
c01156061 PCI: Document tha... |
1738 |
conf1 [X86] Force use of PCI Configuration |
a99130449 [PATCH] kernel-pa... |
1739 |
Mechanism 1. |
c01156061 PCI: Document tha... |
1740 |
conf2 [X86] Force use of PCI Configuration |
a99130449 [PATCH] kernel-pa... |
1741 |
Mechanism 2. |
7f7857636 pci: implement "p... |
1742 1743 1744 |
noaer [PCIE] If the PCIEAER kernel config parameter is enabled, this kernel boot option can be used to disable the use of PCIE advanced error reporting. |
32a2eea79 PCI: Add 'nodomai... |
1745 1746 |
nodomains [PCI] Disable support for multiple PCI root domains (aka PCI segments, in ACPI-speak). |
6cececfce x86, documentatio... |
1747 |
nommconf [X86] Disable use of MMCONFIG for PCI |
61be6d660 [PATCH] mmconfig:... |
1748 |
Configuration |
129830773 x86/PCI: add desc... |
1749 1750 1751 |
check_enable_amd_mmconf [X86] check for and enable properly configured MMIO access to PCI config space on AMD family 10h CPU |
309e57df7 [PATCH] PCI: Prov... |
1752 1753 1754 |
nomsi [MSI] If the PCI_MSI kernel config parameter is enabled, this kernel boot option can be used to disable the use of MSI interrupts system-wide. |
a9322f648 x86, pci: introdu... |
1755 1756 1757 |
noioapicquirk [APIC] Disable all boot interrupt quirks. Safety option to keep boot IRQs enabled. This should never be necessary. |
9197979b5 x86, pci: introdu... |
1758 1759 1760 1761 |
ioapicreroute [APIC] Enable rerouting of boot IRQs to the primary IO-APIC for bridges that cannot disable boot IRQs. This fixes a source of spurious IRQs when the system masks IRQs. |
41b9eb264 x86, pci: introdu... |
1762 1763 1764 1765 |
noioapicreroute [APIC] Disable workaround that uses the boot IRQ equivalent of an IRQ that connects to a chipset where boot IRQs cannot be disabled. The opposite of ioapicreroute. |
cd4f0ef7c doc/kernel-parame... |
1766 |
biosirq [X86-32] Use PCI BIOS calls to get the interrupt |
a99130449 [PATCH] kernel-pa... |
1767 1768 1769 1770 1771 1772 1773 |
routing table. These calls are known to be buggy on several machines and they hang the machine when used, but on other computers it's the only way to get the interrupt routing table. Try this option if the kernel is unable to allocate IRQs or discover secondary PCI buses on your motherboard. |
c01156061 PCI: Document tha... |
1774 |
rom [X86] Assign address space to expansion ROMs. |
a99130449 [PATCH] kernel-pa... |
1775 1776 1777 |
Use with caution as certain devices share address decoders between ROMs and other resources. |
c01156061 PCI: Document tha... |
1778 |
norom [X86] Do not assign address space to |
bb71ad880 PCI: boot paramet... |
1779 1780 |
expansion ROMs that do not already have BIOS assigned address ranges. |
c01156061 PCI: Document tha... |
1781 |
irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be |
a99130449 [PATCH] kernel-pa... |
1782 1783 1784 |
assigned automatically to PCI devices. You can make the kernel exclude IRQs of your ISA cards this way. |
c01156061 PCI: Document tha... |
1785 |
pirqaddr=0xAAAAA [X86] Specify the physical address |
a99130449 [PATCH] kernel-pa... |
1786 1787 1788 |
of the PIRQ table (normally generated by the BIOS) if it is outside the F0000h-100000h range. |
c01156061 PCI: Document tha... |
1789 |
lastbus=N [X86] Scan all buses thru bus #N. Can be |
a99130449 [PATCH] kernel-pa... |
1790 1791 1792 |
useful if the kernel is unable to find your secondary buses and you want to tell it explicitly which ones they are. |
c01156061 PCI: Document tha... |
1793 |
assign-busses [X86] Always assign all PCI bus |
a99130449 [PATCH] kernel-pa... |
1794 1795 |
numbers ourselves, overriding whatever the firmware may have done. |
c01156061 PCI: Document tha... |
1796 |
usepirqmask [X86] Honor the possible IRQ mask stored |
a99130449 [PATCH] kernel-pa... |
1797 1798 1799 1800 1801 |
in the BIOS $PIR table. This is needed on some systems with broken BIOSes, notably some HP Pavilion N5400 and Omnibook XE3 notebooks. This will have no effect if ACPI IRQ routing is enabled. |
c01156061 PCI: Document tha... |
1802 |
noacpi [X86] Do not use ACPI for IRQ routing |
a99130449 [PATCH] kernel-pa... |
1803 |
or for PCI scanning. |
7bc5e3f2b x86/PCI: use host... |
1804 1805 1806 1807 1808 1809 |
use_crs [X86] Use PCI host bridge window information from ACPI. On BIOSes from 2008 or later, this is enabled by default. If you need to use this, please report a bug. nocrs [X86] Ignore PCI host bridge windows from ACPI. If you need to use this, please report a bug. |
a99130449 [PATCH] kernel-pa... |
1810 1811 1812 1813 |
routeirq Do IRQ routing for all PCI devices. This is normally done in pci_enable_device(), so this option is a temporary workaround for broken drivers that don't call it. |
13a6ddb08 x86/pci: add pci=... |
1814 1815 |
skip_isa_align [X86] do not align io start addr, so can handle more pci cards |
a99130449 [PATCH] kernel-pa... |
1816 1817 1818 1819 1820 |
firmware [ARM] Do not re-enumerate the bus but instead just use the configuration from the bootloader. This is currently used on IXP2000 systems where the bus has to be configured a certain way for adjunct CPUs. |
0637a70a5 [PATCH] x86: Allo... |
1821 1822 1823 1824 1825 |
noearly [X86] Don't do any early type 1 scanning. This might help on some broken boards which machine check when some devices' config space is read. But various workarounds are disabled and some IOMMU drivers will not work. |
6b4b78fed PCI: optionally s... |
1826 1827 1828 1829 |
bfsort Sort PCI devices into breadth-first order. This sorting is done to get a device order compatible with older (<= 2.4) kernels. nobfsort Don't sort PCI devices into breadth-first order. |
4516a618a PCI: Make CARDBUS... |
1830 1831 1832 1833 1834 1835 |
cbiosize=nn[KMG] The fixed amount of bus space which is reserved for the CardBus bridge's IO window. The default value is 256 bytes. cbmemsize=nn[KMG] The fixed amount of bus space which is reserved for the CardBus bridge's memory window. The default value is 64 megabytes. |
32a9a682b PCI: allow assign... |
1836 1837 1838 1839 1840 1841 1842 1843 1844 |
resource_alignment= Format: [<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...] Specifies alignment and device to reassign aligned memory resources. If <order of align> is not specified, PAGE_SIZE is used as alignment. PCI-PCI bridge can be specified, if resource windows need to be expanded. |
43c164088 PCI: Add support ... |
1845 1846 1847 1848 1849 1850 |
ecrc= Enable/disable PCIe ECRC (transaction layer end-to-end CRC checking). bios: Use BIOS/firmware settings. This is the the default. off: Turn ECRC off on: Turn ECRC on. |
6b4b78fed PCI: optionally s... |
1851 |
|
e5665a45f PCI: document the... |
1852 1853 1854 1855 1856 |
pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power Management. off Disable ASPM. force Enable ASPM even on devices that claim not to support it. WARNING: Forcing ASPM on may cause system lockups. |
c7f486567 PCI PM: PCIe PME ... |
1857 1858 1859 1860 1861 |
pcie_pme= [PCIE,PM] Native PCIe PME signaling options: off Do not use native PCIe PME signaling. force Use native PCIe PME signaling even if the BIOS refuses to allow the kernel to control the relevant PCIe config registers. |
c39fae141 PCI PM: Make it p... |
1862 1863 |
nomsi Do not use MSI for native PCIe PME signaling (this makes all PCIe root ports use INTx for everything). |
c7f486567 PCI PM: PCIe PME ... |
1864 |
|
1da177e4c Linux-2.6.12-rc2 |
1865 1866 1867 |
pcmv= [HW,PCMCIA] BadgePAD 4 pd. [PARIDE] |
31c00fc15 Create/use more d... |
1868 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
1869 1870 1871 1872 1873 |
pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at boot time. Format: { 0 | 1 } See arch/parisc/kernel/pdc_chassis.c |
f58dc01ba percpu: generaliz... |
1874 |
percpu_alloc= Select which percpu first chunk allocator to use. |
e933a73f4 percpu: kill lpag... |
1875 1876 1877 1878 1879 |
Currently supported values are "embed" and "page". Archs may support subset or none of the selections. See comments in mm/percpu.c for details on each allocator. This parameter is primarily for debugging and performance comparison. |
fa8a7094b x86: implement pe... |
1880 |
|
1da177e4c Linux-2.6.12-rc2 |
1881 |
pf. [PARIDE] |
31c00fc15 Create/use more d... |
1882 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
1883 1884 |
pg. [PARIDE] |
31c00fc15 Create/use more d... |
1885 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
1886 1887 |
pirq= [SMP,APIC] Manual mp-table setup |
71cced6eb doc/x86: fix doc ... |
1888 |
See Documentation/x86/i386/IO-APIC.txt. |
1da177e4c Linux-2.6.12-rc2 |
1889 1890 1891 1892 |
plip= [PPT,NET] Parallel port network link Format: { parport<nr> | timid | 0 } See also Documentation/parport.txt. |
de32a2434 kernel-paramaters... |
1893 1894 1895 |
pmtmr= [X86] Manual setup of pmtmr I/O Port. Override pmtimer IOPort with a hex value. e.g. pmtmr=0x508 |
97ef062bb PNP: add CONFIG_P... |
1896 1897 1898 |
pnp.debug [PNP] Enable PNP debug messages. This depends on the CONFIG_PNP_DEBUG_MESSAGES option. |
1da177e4c Linux-2.6.12-rc2 |
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 |
pnpacpi= [ACPI] { off } pnpbios= [ISAPNP] { on | off | curr | res | no-curr | no-res } pnp_reserve_irq= [ISAPNP] Exclude IRQs for the autoconfiguration pnp_reserve_dma= [ISAPNP] Exclude DMAs for the autoconfiguration pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
a99130449 [PATCH] kernel-pa... |
1912 |
Ranges are in pairs (I/O port base and size). |
1da177e4c Linux-2.6.12-rc2 |
1913 1914 |
pnp_reserve_mem= |
a99130449 [PATCH] kernel-pa... |
1915 1916 |
[ISAPNP] Exclude memory regions for the autoconfiguration. |
1da177e4c Linux-2.6.12-rc2 |
1917 |
Ranges are in pairs (memory base and size). |
4af94f390 doc: fix kernel-p... |
1918 1919 1920 1921 1922 |
ports= [IP_VS_FTP] IPVS ftp helper module Default is 21. Up to 8 (IP_VS_APP_MAX_PORTS) ports may be specified. Format: <port>,<port>.... |
45807a1df vdso: print fatal... |
1923 1924 |
print-fatal-signals= [KNL] debug: print fatal signals |
f84d49b21 signal: Print war... |
1925 1926 1927 1928 1929 1930 1931 1932 |
If enabled, warn about various signal handling related application anomalies: too many signals, too many POSIX.1 timers, fatal signals causing a coredump - etc. If you hit the warning due to signal overflow, you might want to try "ulimit -i unlimited". |
45807a1df vdso: print fatal... |
1933 |
default: off. |
e84845c4b add printk.time o... |
1934 1935 |
printk.time= Show timing data prefixed to each printk message line Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
0cb55ad2a docs: alphabetize... |
1936 1937 1938 1939 1940 1941 1942 |
processor.max_cstate= [HW,ACPI] Limit processor to maximum C-state max_cstate=9 overrides any DMI blacklist limit. processor.nocst [HW,ACPI] Ignore the _CST method to determine C-states, instead using the legacy FADT method |
1da177e4c Linux-2.6.12-rc2 |
1943 |
profile= [KNL] Enable kernel profiling via /proc/profile |
a99130449 [PATCH] kernel-pa... |
1944 1945 1946 1947 |
Format: [schedule,]<number> Param: "schedule" - profile schedule points. Param: <number> - step/bucket size as a power of 2 for statistical time based profiling. |
b3da2a73f sched: document p... |
1948 1949 |
Param: "sleep" - profile D-state sleeping (millisecs). Requires CONFIG_SCHEDSTATS |
c0fe2e696 Add missing profi... |
1950 |
Param: "kvm" - profile VM exits. |
1da177e4c Linux-2.6.12-rc2 |
1951 |
|
1da177e4c Linux-2.6.12-rc2 |
1952 1953 |
prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk before loading. |
31c00fc15 Create/use more d... |
1954 |
See Documentation/blockdev/ramdisk.txt. |
1da177e4c Linux-2.6.12-rc2 |
1955 |
|
a99130449 [PATCH] kernel-pa... |
1956 1957 |
psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to probe for; one of (bare|imps|exps|lifebook|any). |
1da177e4c Linux-2.6.12-rc2 |
1958 1959 |
psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports per second. |
a99130449 [PATCH] kernel-pa... |
1960 1961 |
psmouse.resetafter= [HW,MOUSE] Try to reset the device after so many bad packets |
1da177e4c Linux-2.6.12-rc2 |
1962 1963 1964 1965 |
(0 = never). psmouse.resolution= [HW,MOUSE] Set desired mouse resolution, in dpi. psmouse.smartscroll= |
a99130449 [PATCH] kernel-pa... |
1966 |
[HW,MOUSE] Controls Logitech smartscroll autorepeat. |
1da177e4c Linux-2.6.12-rc2 |
1967 1968 1969 |
0 = disabled, 1 = enabled (default). pss= [HW,OSS] Personal Sound System (ECHO ESC614) |
a99130449 [PATCH] kernel-pa... |
1970 1971 |
Format: <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> |
1da177e4c Linux-2.6.12-rc2 |
1972 1973 |
pt. [PARIDE] |
31c00fc15 Create/use more d... |
1974 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
1975 |
|
dc8c85871 PTY: add kernel p... |
1976 1977 1978 |
pty.legacy_count= [KNL] Number of legacy pty's. Overwrites compiled-in default number. |
7d2c502f1 [PATCH] doc: fix ... |
1979 |
quiet [KNL] Disable most log messages |
a99130449 [PATCH] kernel-pa... |
1980 |
|
1da177e4c Linux-2.6.12-rc2 |
1981 1982 1983 1984 |
r128= [HW,DRM] raid= [HW,RAID] See Documentation/md.txt. |
a99130449 [PATCH] kernel-pa... |
1985 |
ramdisk_blocksize= [RAM] |
31c00fc15 Create/use more d... |
1986 |
See Documentation/blockdev/ramdisk.txt. |
a99130449 [PATCH] kernel-pa... |
1987 |
|
1da177e4c Linux-2.6.12-rc2 |
1988 |
ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
31c00fc15 Create/use more d... |
1989 |
See Documentation/blockdev/ramdisk.txt. |
1da177e4c Linux-2.6.12-rc2 |
1990 |
|
24aaef8d7 Documentation: U... |
1991 1992 1993 |
rcupdate.blimit= [KNL,BOOT] Set maximum number of finished RCU callbacks to process in one batch. |
21a1ea9eb [PATCH] rcu batch... |
1994 |
|
24aaef8d7 Documentation: U... |
1995 1996 |
rcupdate.qhimark= [KNL,BOOT] Set threshold of queued |
21a1ea9eb [PATCH] rcu batch... |
1997 |
RCU callbacks over which batch limiting is disabled. |
24aaef8d7 Documentation: U... |
1998 1999 2000 |
rcupdate.qlowmark= [KNL,BOOT] Set threshold of queued RCU callbacks below which batch limiting is re-enabled. |
21a1ea9eb [PATCH] rcu batch... |
2001 |
|
ffdfc4097 [PATCH] Add rdini... |
2002 2003 2004 2005 |
rdinit= [KNL] Format: <full_path> Run specified binary instead of /init from the ramdisk, used for early userspace startup. See initrd. |
cd4f0ef7c doc/kernel-parame... |
2006 |
reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
1da177e4c Linux-2.6.12-rc2 |
2007 |
Format: <reboot_mode>[,<reboot_mode2>[,...]] |
ecb08d813 doc: reformat som... |
2008 |
See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
1da177e4c Linux-2.6.12-rc2 |
2009 |
|
46b6d94eb doc: document the... |
2010 2011 |
relax_domain_level= [KNL, SMP] Set scheduler's default relax_domain_level. |
21acb9caa trivial: fix wher... |
2012 |
See Documentation/cgroups/cpusets.txt. |
46b6d94eb doc: document the... |
2013 |
|
1da177e4c Linux-2.6.12-rc2 |
2014 |
reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
cd4f0ef7c doc/kernel-parame... |
2015 |
reservetop= [X86-32] |
461a9afff [PATCH] x86: add ... |
2016 2017 2018 |
Format: nn[KMG] Reserves a hole at the top of the kernel virtual address space. |
7e96287dd [PATCH] kdump: in... |
2019 2020 |
reset_devices [KNL] Force drivers to reset the underlying device during initialization. |
a99130449 [PATCH] kernel-pa... |
2021 2022 |
resume= [SWSUSP] Specify the partition device for software suspend |
1da177e4c Linux-2.6.12-rc2 |
2023 |
|
ecbd0da1e [PATCH] swsusp: d... |
2024 2025 2026 2027 2028 |
resume_offset= [SWSUSP] Specify the offset from the beginning of the partition given by "resume=" at which the swap header is located, in <PAGE_SIZE> units (needed only for swap files). See Documentation/power/swsusp-and-swap-files.txt |
0a7b35cb1 [PATCH] Add retai... |
2029 |
retain_initrd [RAM] Keep initrd memory after extraction |
1da177e4c Linux-2.6.12-rc2 |
2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 |
rhash_entries= [KNL,NET] Set number of hash buckets for route cache riscom8= [HW,SERIAL] Format: <io_board1>[,<io_board2>[,...<io_boardN>]] ro [KNL] Mount root device read-only on boot root= [KNL] Root filesystem rootdelay= [KNL] Delay (in seconds) to pause before attempting to mount the root filesystem rootflags= [KNL] Set root filesystem mount option string rootfstype= [KNL] Set root filesystem type |
cc1ed7542 init: wait for as... |
2046 2047 2048 |
rootwait [KNL] Wait (indefinitely) for root device to show up. Useful for devices that are detected asynchronously (e.g. USB and MMC devices). |
1da177e4c Linux-2.6.12-rc2 |
2049 2050 2051 2052 2053 2054 |
rw [KNL] Mount root device read-write on boot S [KNL] Run init in single mode sa1100ir [NET] See drivers/net/irda/sa1100_ir.c. |
1da177e4c Linux-2.6.12-rc2 |
2055 |
sbni= [NET] Granch SBNI12 leased line adapter |
a99130449 [PATCH] kernel-pa... |
2056 |
|
f6630114d sched: Limit the ... |
2057 |
sched_debug [KNL] Enables verbose scheduler debug messages. |
1da177e4c Linux-2.6.12-rc2 |
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 |
sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver Format: <io>[,<timeout>[,<isapnp>]] scsi_debug_*= [SCSI] See drivers/scsi/scsi_debug.c. scsi_default_dev_flags= [SCSI] SCSI default device flags Format: <integer> scsi_dev_flags= [SCSI] Black/white list entry for vendor and model Format: <vendor>:<model>:<flags> (flags are integer value) |
6af6632a1 [SCSI] boot optio... |
2071 2072 2073 2074 2075 2076 2077 |
scsi_logging_level= [SCSI] a bit mask of logging levels See drivers/scsi/scsi_logging.h for bits. Also settable via sysctl at dev.scsi.logging_level (/proc/sys/dev/scsi/logging_level). There is also a nice 'scsi_logging_level' script in the S390-tools package, available for download at http://www-128.ibm.com/developerworks/linux/linux390/s390-tools-1.5.4.html |
1da177e4c Linux-2.6.12-rc2 |
2078 |
|
3e082a910 [SCSI] Add abilit... |
2079 2080 2081 2082 |
scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are discovered. async scans them in kernel threads, allowing boot to proceed. none ignores them, expecting user space to do the scan. |
0cb55ad2a docs: alphabetize... |
2083 2084 2085 2086 2087 2088 2089 |
security= [SECURITY] Choose a security module to enable at boot. If this boot parameter is not specified, only the first security module asking for security registration will be loaded. An invalid security module name will be treated as if no module has been chosen. selinux= [SELINUX] Disable or enable SELinux at boot time. |
1da177e4c Linux-2.6.12-rc2 |
2090 2091 2092 2093 2094 2095 2096 |
Format: { "0" | "1" } See security/selinux/Kconfig help text. 0 -- disable. 1 -- enable. Default value is set via kernel config option. If enabled at boot time, /selinux/disable can be used later to disable prior to initial policy load. |
cd4f0ef7c doc/kernel-parame... |
2097 |
serialnumber [BUGS=X86-32] |
1da177e4c Linux-2.6.12-rc2 |
2098 |
|
1da177e4c Linux-2.6.12-rc2 |
2099 2100 |
shapers= [NET] Maximal number of shapers. |
a99130449 [PATCH] kernel-pa... |
2101 |
|
b05f78f5c x86_64: printout ... |
2102 2103 2104 2105 2106 |
show_msr= [x86] show boot-time MSR settings Format: { <integer> } Show boot-time (BIOS-initialized) MSR settings. The parameter means the number of CPUs to show, for example 1 means boot CPU only. |
1da177e4c Linux-2.6.12-rc2 |
2107 2108 2109 2110 2111 |
sim710= [SCSI,HW] See header of drivers/scsi/sim710.c. simeth= [IA-64] simscsi= |
a99130449 [PATCH] kernel-pa... |
2112 |
|
1da177e4c Linux-2.6.12-rc2 |
2113 |
slram= [HW,MTD] |
f0630fff5 SLUB: support slu... |
2114 2115 2116 2117 2118 2119 2120 |
slub_debug[=options[,slabs]] [MM, SLUB] Enabling slub_debug allows one to determine the culprit if slab objects become corrupted. Enabling slub_debug can create guard zones around objects and may poison objects when not in use. Also tracks the last alloc / free. For more information see Documentation/vm/slub.txt. |
c1aee215d SLUB: More docume... |
2121 2122 |
slub_max_order= [MM, SLUB] |
f0630fff5 SLUB: support slu... |
2123 2124 2125 2126 |
Determines the maximum allowed order for slabs. A high setting may cause OOMs due to memory fragmentation. For more information see Documentation/vm/slub.txt. |
c1aee215d SLUB: More docume... |
2127 2128 |
slub_min_objects= [MM, SLUB] |
f0630fff5 SLUB: support slu... |
2129 2130 2131 2132 2133 2134 |
The minimum number of objects per slab. SLUB will increase the slab order up to slub_max_order to generate a sufficiently large slab able to contain the number of objects indicated. The higher the number of objects the smaller the overhead of tracking slabs and the less frequently locks need to be acquired. |
c1aee215d SLUB: More docume... |
2135 2136 2137 2138 |
For more information see Documentation/vm/slub.txt. slub_min_order= [MM, SLUB] Determines the mininum page order for slabs. Must be |
f0630fff5 SLUB: support slu... |
2139 |
lower than slub_max_order. |
c1aee215d SLUB: More docume... |
2140 2141 2142 |
For more information see Documentation/vm/slub.txt. slub_nomerge [MM, SLUB] |
f0630fff5 SLUB: support slu... |
2143 |
Disable merging of slabs with similar size. May be |
c1aee215d SLUB: More docume... |
2144 |
necessary if there is some reason to distinguish |
f0630fff5 SLUB: support slu... |
2145 2146 |
allocs to different slabs. Debug options disable merging on their own. |
c1aee215d SLUB: More docume... |
2147 |
For more information see Documentation/vm/slub.txt. |
1da177e4c Linux-2.6.12-rc2 |
2148 2149 |
smart2= [HW] Format: <io1>[,<io2>[,...,<io8>]] |
cd4f0ef7c doc/kernel-parame... |
2150 |
smp-alt-once [X86-32,SMP] On a hotplug CPU system, only |
b7fb4af06 [PATCH] i386: All... |
2151 |
attempt to substitute SMP alternatives once at boot. |
d0d4f69bb smsc-ircc2: add P... |
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 |
smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port smsc-ircc2.ircc_sir= [HW] SIR base I/O port smsc-ircc2.ircc_fir= [HW] FIR base I/O port smsc-ircc2.ircc_irq= [HW] IRQ line smsc-ircc2.ircc_dma= [HW] DMA channel smsc-ircc2.ircc_transceiver= [HW] Transceiver type: 0: Toshiba Satellite 1800 (GP data pin select) 1: Fast pin select (default) 2: ATC IRMode |
1da177e4c Linux-2.6.12-rc2 |
2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 |
snd-ad1816a= [HW,ALSA] snd-ad1848= [HW,ALSA] snd-ali5451= [HW,ALSA] snd-als100= [HW,ALSA] snd-als4000= [HW,ALSA] snd-azt2320= [HW,ALSA] snd-cmi8330= [HW,ALSA] snd-cmipci= [HW,ALSA] snd-cs4231= [HW,ALSA] snd-cs4232= [HW,ALSA] snd-cs4236= [HW,ALSA] snd-cs4281= [HW,ALSA] snd-cs46xx= [HW,ALSA] snd-dt019x= [HW,ALSA] snd-dummy= [HW,ALSA] snd-emu10k1= [HW,ALSA] snd-ens1370= [HW,ALSA] snd-ens1371= [HW,ALSA] snd-es968= [HW,ALSA] snd-es1688= [HW,ALSA] snd-es18xx= [HW,ALSA] snd-es1938= [HW,ALSA] snd-es1968= [HW,ALSA] snd-fm801= [HW,ALSA] snd-gusclassic= [HW,ALSA] snd-gusextreme= [HW,ALSA] snd-gusmax= [HW,ALSA] snd-hdsp= [HW,ALSA] snd-ice1712= [HW,ALSA] snd-intel8x0= [HW,ALSA] snd-interwave= [HW,ALSA] snd-interwave-stb= [HW,ALSA] snd-korg1212= [HW,ALSA] snd-maestro3= [HW,ALSA] snd-mpu401= [HW,ALSA] snd-mtpav= [HW,ALSA] snd-nm256= [HW,ALSA] snd-opl3sa2= [HW,ALSA] snd-opti92x-ad1848= [HW,ALSA] snd-opti92x-cs4231= [HW,ALSA] snd-opti93x= [HW,ALSA] snd-pmac= [HW,ALSA] snd-rme32= [HW,ALSA] snd-rme96= [HW,ALSA] snd-rme9652= [HW,ALSA] snd-sb8= [HW,ALSA] snd-sb16= [HW,ALSA] snd-sbawe= [HW,ALSA] snd-serial= [HW,ALSA] snd-sgalaxy= [HW,ALSA] snd-sonicvibes= [HW,ALSA] snd-sun-amd7930= [HW,ALSA] snd-sun-cs4231= [HW,ALSA] snd-trident= [HW,ALSA] snd-usb-audio= [HW,ALSA,USB] snd-via82xx= [HW,ALSA] snd-virmidi= [HW,ALSA] snd-wavefront= [HW,ALSA] snd-ymfpci= [HW,ALSA] |
a99130449 [PATCH] kernel-pa... |
2283 |
|
9c44bc03f softlockup: allow... |
2284 2285 |
softlockup_panic= [KNL] Should the soft-lockup detector generate panics. |
1da177e4c Linux-2.6.12-rc2 |
2286 2287 2288 2289 |
sonypi.*= [HW] Sony Programmable I/O Control Device driver See Documentation/sonypi.txt specialix= [HW,SERIAL] Specialix multi-serial port adapter |
31c00fc15 Create/use more d... |
2290 |
See Documentation/serial/specialix.txt. |
1da177e4c Linux-2.6.12-rc2 |
2291 2292 2293 2294 2295 2296 2297 2298 |
spia_io_base= [HW,MTD] spia_fio_base= spia_pedr= spia_peddr= sscape= [HW,OSS] Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> |
a99130449 [PATCH] kernel-pa... |
2299 |
|
1da177e4c Linux-2.6.12-rc2 |
2300 2301 |
st= [HW,SCSI] SCSI tape parameters (buffers, etc.) See Documentation/scsi/st.txt. |
f38f1d2aa trace: add a way ... |
2302 2303 |
stacktrace [FTRACE] Enabled the stack tracer on boot up. |
1da177e4c Linux-2.6.12-rc2 |
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 |
sti= [PARISC,HW] Format: <num> Set the STI (builtin display/keyboard on the HP-PARISC machines) console (graphic card) which should be used as the initial boot-console. See also comment in drivers/video/console/sticore.c. sti_font= [HW] See comment in drivers/video/console/sticore.c. stifb= [HW] Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
cbf110712 SUNRPC: convert s... |
2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 |
sunrpc.min_resvport= sunrpc.max_resvport= [NFS,SUNRPC] SunRPC servers often require that client requests originate from a privileged port (i.e. a port in the range 0 < portnr < 1024). An administrator who wishes to reserve some of these ports for other uses may adjust the range that the kernel's sunrpc client considers to be privileged using these two parameters to set the minimum and maximum port values. |
42a7fc4a6 [PATCH] knfsd: pr... |
2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 |
sunrpc.pool_mode= [NFS] Control how the NFS server code allocates CPUs to service thread pools. Depending on how many NICs you have and where their interrupts are bound, this option will affect which CPUs will do NFS serving. Note: this parameter cannot be changed while the NFS server is running. auto the server chooses an appropriate mode automatically using heuristics global a single global pool contains all CPUs percpu one pool for each CPU pernode one pool for each NUMA node (equivalent to global on non-NUMA machines) |
cbf110712 SUNRPC: convert s... |
2342 2343 2344 2345 2346 2347 2348 2349 |
sunrpc.tcp_slot_table_entries= sunrpc.udp_slot_table_entries= [NFS,SUNRPC] Sets the upper limit on the number of simultaneous RPC calls that can be sent from the client to a server. Increasing these values may allow you to improve throughput, but will also increase the amount of memory reserved for use by the client. |
1da177e4c Linux-2.6.12-rc2 |
2350 |
swiotlb= [IA-64] Number of I/O TLB slabs |
a99130449 [PATCH] kernel-pa... |
2351 |
|
1da177e4c Linux-2.6.12-rc2 |
2352 2353 2354 2355 |
switches= [HW,M68k] sym53c416= [HW,SCSI] See header of drivers/scsi/sym53c416.c. |
5d6f647fc [PATCH] debug: ad... |
2356 2357 2358 2359 2360 |
sysrq_always_enabled [KNL] Ignore sysrq setting - this boot parameter will neutralize any effect of /proc/sys/kernel/sysrq. Useful for debugging. |
1da177e4c Linux-2.6.12-rc2 |
2361 2362 2363 2364 |
t128= [HW,SCSI] See header of drivers/scsi/t128.c. tdfx= [HW,DRM] |
77437fd4e pm: boot time sus... |
2365 2366 2367 2368 2369 |
test_suspend= [SUSPEND] Specify "mem" (for Suspend-to-RAM) or "standby" (for standby suspend) as the system sleep state to briefly enter during system startup. The system is woken from this state using a wakeup-capable RTC alarm. |
1da177e4c Linux-2.6.12-rc2 |
2370 2371 |
thash_entries= [KNL,NET] Set number of hash buckets for TCP connection |
f8707ec96 ACPI: thermal: cr... |
2372 2373 2374 |
thermal.act= [HW,ACPI] -1: disable all active trip points in all thermal zones <degrees C>: override all lowest active trip points |
c52a7419a ACPI: thermal: cr... |
2375 2376 |
thermal.crt= [HW,ACPI] -1: disable all critical trip points in all thermal zones |
22a94d79a ACPI: Allow overr... |
2377 |
<degrees C>: override all critical trip points |
c52a7419a ACPI: thermal: cr... |
2378 |
|
f54871456 ACPI: thermal: cr... |
2379 2380 2381 |
thermal.nocrt= [HW,ACPI] Set to disable actions on ACPI thermal zone critical and hot trip points. |
72b33ef8b ACPI: thermal: cr... |
2382 2383 |
thermal.off= [HW,ACPI] 1: disable ACPI thermal control |
a70cdc520 ACPI: thermal: cr... |
2384 2385 |
thermal.psv= [HW,ACPI] -1: disable all passive trip points |
ada9cfdd1 doc: fix kernel-p... |
2386 2387 |
<degrees C>: override all passive trip points to this value |
a70cdc520 ACPI: thermal: cr... |
2388 |
|
730ff34de ACPI: thermal: ex... |
2389 2390 2391 2392 |
thermal.tzp= [HW,ACPI] Specify global default ACPI thermal zone polling rate <deci-seconds>: poll all this frequency 0: no polling (default) |
1da177e4c Linux-2.6.12-rc2 |
2393 2394 2395 |
tmscsim= [HW,SCSI] See comment before function dc390_setup() in drivers/scsi/tmscsim.c. |
2b1a61f0a [S390] cpu topolo... |
2396 2397 2398 2399 2400 2401 2402 |
topology= [S390] Format: {off | on} Specify if the kernel should make use of the cpu topology informations if the hardware supports these. The scheduler will make use of these informations and e.g. base its process migration decisions on it. Default is off. |
1da177e4c Linux-2.6.12-rc2 |
2403 |
tp720= [HW,PS2] |
225a9be24 TPM: workaround t... |
2404 2405 2406 2407 2408 2409 2410 2411 |
tpm_suspend_pcr=[HW,TPM] Format: integer pcr id Specify that at suspend time, the tpm driver should extend the specified pcr with zeros, as a workaround for some chips which fail to flush the last written pcr on TPM_SaveState. This will guarantee that all the other pcrs are saved. |
9d612beff tracing: Fix trac... |
2412 2413 |
trace_buf_size=nn[KMG] [FTRACE] will set tracing buffer size. |
631595fbf doc: add trace_bu... |
2414 |
|
020e5f85c tracing/events: A... |
2415 2416 2417 2418 |
trace_event=[event-list] [FTRACE] Set and start specified trace events in order to facilitate early boot debugging. See also Documentation/trace/events.txt |
1da177e4c Linux-2.6.12-rc2 |
2419 |
trix= [HW,OSS] MediaTrix AudioTrix Pro |
a99130449 [PATCH] kernel-pa... |
2420 2421 |
Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> |
395628ef4 x86: Skip verific... |
2422 2423 2424 2425 2426 2427 |
tsc= Disable clocksource-must-verify flag for TSC. Format: <string> [x86] reliable: mark tsc clocksource as reliable, this disables clocksource verification at runtime. Used to enable high-resolution timer mode on older hardware, and in virtualized environment. |
a99130449 [PATCH] kernel-pa... |
2428 2429 2430 2431 |
turbografx.map[2|3]= [HW,JOY] TurboGraFX parallel port interface Format: <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
1da177e4c Linux-2.6.12-rc2 |
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 |
See also Documentation/input/joystick-parport.txt u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter See header of drivers/scsi/u14-34f.c. uart401= [HW,OSS] Format: <io>,<irq> uart6850= [HW,OSS] Format: <io>,<irq> |
f86dcc5aa udp: dynamically ... |
2442 2443 |
uhash_entries= [KNL,NET] Set number of hash buckets for UDP/UDP-Lite connections |
5f8364b7d UHCI: module para... |
2444 2445 2446 2447 2448 2449 2450 |
uhci-hcd.ignore_oc= [USB] Ignore overcurrent events (default N). Some badly-designed motherboards generate lots of bogus events, for ports that aren't wired to anything. Set this parameter to avoid log spamming. Note that genuine overcurrent events won't be reported either. |
e3a61b0a8 x86: add unknown_... |
2451 |
unknown_nmi_panic |
6cececfce x86, documentatio... |
2452 |
[X86] |
e3a61b0a8 x86: add unknown_... |
2453 |
Set unknown_nmi_panic=1 early on boot. |
b5e795f8d USB: make autosus... |
2454 2455 2456 2457 2458 |
usbcore.autosuspend= [USB] The autosuspend time delay (in seconds) used for newly-detected USB devices (default 2). This is the time required before an idle device will be autosuspended. Devices for which the delay is set |
eaafbc3a8 USB: Allow autosu... |
2459 |
to a negative value won't be autosuspended at all. |
b5e795f8d USB: make autosus... |
2460 |
|
fd7c519dd USB: hub.c: Add i... |
2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 |
usbcore.usbfs_snoop= [USB] Set to log all usbfs traffic (default 0 = off). usbcore.blinkenlights= [USB] Set to cycle leds on hubs (default 0 = off). usbcore.old_scheme_first= [USB] Start with the old device initialization scheme (default 0 = off). usbcore.use_both_schemes= [USB] Try the other device initialization scheme if the first one fails (default 1 = enabled). usbcore.initial_descriptor_timeout= [USB] Specifies timeout for the initial 64-byte USB_REQ_GET_DESCRIPTOR request in milliseconds (default 5000 = 5.0 seconds). |
1da177e4c Linux-2.6.12-rc2 |
2479 2480 |
usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. |
a99130449 [PATCH] kernel-pa... |
2481 |
|
d4f373e57 USB: usb-storage:... |
2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 |
usb-storage.delay_use= [UMS] The delay in seconds before a new device is scanned for Logical Units (default 5). usb-storage.quirks= [UMS] A list of quirks entries to supplement or override the built-in unusual_devs list. List entries are separated by commas. Each entry has the form VID:PID:Flags where VID and PID are Vendor and Product ID values (4-digit hex numbers) and Flags is a set of characters, each corresponding to a common usb-storage quirk flag as follows: |
c838ea462 USB: storage: mak... |
2494 2495 |
a = SANE_SENSE (collect more than 18 bytes of sense data); |
a0bb10811 USB: usb-storage:... |
2496 2497 |
b = BAD_SENSE (don't collect more than 18 bytes of sense data); |
d4f373e57 USB: usb-storage:... |
2498 2499 |
c = FIX_CAPACITY (decrease the reported device capacity by one sector); |
c838ea462 USB: storage: mak... |
2500 2501 2502 |
h = CAPACITY_HEURISTICS (decrease the reported device capacity by one sector if the number is odd); |
d4f373e57 USB: usb-storage:... |
2503 2504 2505 2506 2507 2508 |
i = IGNORE_DEVICE (don't bind to this device); l = NOT_LOCKABLE (don't try to lock and unlock ejectable media); m = MAX_SECTORS_64 (don't transfer more than 64 sectors = 32 KB at a time); |
c838ea462 USB: storage: mak... |
2509 2510 |
o = CAPACITY_OK (accept the capacity reported by the device); |
d4f373e57 USB: usb-storage:... |
2511 2512 2513 2514 2515 2516 2517 |
r = IGNORE_RESIDUE (the device reports bogus residue values); s = SINGLE_LUN (the device has only one Logical Unit); w = NO_WP_DETECT (don't test whether the medium is write-protected). Example: quirks=0419:aaf5:rl,0421:0433:rc |
143155920 x86, mm: Allow hi... |
2518 2519 2520 2521 2522 2523 |
userpte= [X86] Flags controlling user PTE allocations. nohigh = do not allocate PTE pages in HIGHMEM regardless of setting of CONFIG_HIGHPTE. |
6cececfce x86, documentatio... |
2524 |
vdso= [X86,SH] |
1dbf527c5 [PATCH] i386: Mak... |
2525 |
vdso=2: enable compat VDSO (default with COMPAT_VDSO) |
e6e5494cb [PATCH] vdso: ran... |
2526 2527 |
vdso=1: enable VDSO (default) vdso=0: disable VDSO mapping |
6cececfce x86, documentatio... |
2528 |
vdso32= [X86] |
af65d6484 x86 vDSO: consoli... |
2529 2530 2531 |
vdso32=2: enable compat VDSO (default with COMPAT_VDSO) vdso32=1: enable 32-bit VDSO (default) vdso32=0: disable 32-bit VDSO mapping |
d080d397f [IA64] Enable per... |
2532 2533 |
vector= [IA-64,SMP] vector=percpu: enable percpu vector domain |
1da177e4c Linux-2.6.12-rc2 |
2534 2535 |
video= [FB] Frame buffer configuration See Documentation/fb/modedb.txt. |
cd4f0ef7c doc/kernel-parame... |
2536 |
vga= [BOOT,X86-32] Select a particular video mode |
954a8b816 x86, doc: fix ref... |
2537 |
See Documentation/x86/boot.txt and |
a99130449 [PATCH] kernel-pa... |
2538 |
Documentation/svga.txt. |
1da177e4c Linux-2.6.12-rc2 |
2539 2540 2541 |
Use vga=ask for menu. This is actually a boot loader parameter; the value is passed to the kernel using a special protocol. |
a99130449 [PATCH] kernel-pa... |
2542 |
vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
1da177e4c Linux-2.6.12-rc2 |
2543 2544 2545 2546 |
size of <nn>. This can be used to increase the minimum size (128MB on x86). It can also be used to decrease the size and leave more room for directly mapped kernel RAM. |
585c3047a [S390] Add vmpani... |
2547 2548 |
vmhalt= [KNL,S390] Perform z/VM CP command after system halt. Format: <command> |
1da177e4c Linux-2.6.12-rc2 |
2549 |
|
585c3047a [S390] Add vmpani... |
2550 2551 2552 2553 2554 |
vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. Format: <command> vmpoff= [KNL,S390] Perform z/VM CP command after power off. Format: <command> |
a99130449 [PATCH] kernel-pa... |
2555 |
|
9ea9a886b vt: make the defa... |
2556 2557 2558 2559 |
vt.cur_default= [VT] Default cursor shape. Format: 0xCCBBAA, where AA, BB, and CC are the same as the parameters of the <Esc>[?A;B;Cc escape sequence; see VGA-softcursor.txt. Default: 2 = underline. |
0cb55ad2a docs: alphabetize... |
2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 |
vt.default_blu= [VT] Format: <blue0>,<blue1>,<blue2>,...,<blue15> Change the default blue palette of the console. This is a 16-member array composed of values ranging from 0-255. vt.default_grn= [VT] Format: <green0>,<green1>,<green2>,...,<green15> Change the default green palette of the console. This is a 16-member array composed of values ranging from 0-255. vt.default_red= [VT] Format: <red0>,<red1>,<red2>,...,<red15> Change the default red palette of the console. This is a 16-member array composed of values ranging from 0-255. vt.default_utf8= [VT] Format=<0|1> Set system-wide default UTF-8 mode for all tty's. Default is 1, i.e. UTF-8 mode is enabled for all newly opened terminals. |
f6c06b680 vc: Add support f... |
2584 2585 2586 2587 2588 2589 2590 2591 |
vt.global_cursor_default= [VT] Format=<-1|0|1> Set system-wide default for whether a cursor is shown on new VTs. Default is -1, i.e. cursors will be created by default unless overridden by individual drivers. 0 will hide cursors, 1 will display them. |
1da177e4c Linux-2.6.12-rc2 |
2592 2593 |
waveartist= [HW,OSS] Format: <io>,<irq>,<dma>,<dma2> |
a99130449 [PATCH] kernel-pa... |
2594 |
|
1da177e4c Linux-2.6.12-rc2 |
2595 2596 2597 2598 2599 2600 2601 |
wd33c93= [HW,SCSI] See header of drivers/scsi/wd33c93.c. wd7000= [HW,SCSI] See header of drivers/scsi/wd7000.c. wdt= [WDT] Watchdog |
8dfe9c21a kernel-parameters... |
2602 |
See Documentation/watchdog/wdt.txt. |
1da177e4c Linux-2.6.12-rc2 |
2603 |
|
0cb55ad2a docs: alphabetize... |
2604 2605 2606 |
x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of default x2apic cluster mode on platforms supporting x2apic. |
bb24c4716 x86, apbt: Moores... |
2607 2608 2609 2610 2611 |
x86_mrst_timer= [X86-32,APBT] Choose timer option for x86 Moorestown MID platform. Two valid options are apbt timer only and lapic timer plus one apbt timer for broadcast timer. x86_mrst_timer=apbt_only | lapic_and_apbt |
1da177e4c Linux-2.6.12-rc2 |
2612 2613 2614 2615 |
xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. xd_geo= See header of drivers/block/xd.c. xirc2ps_cs= [NET,PCMCIA] |
a99130449 [PATCH] kernel-pa... |
2616 2617 |
Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
1da177e4c Linux-2.6.12-rc2 |
2618 |
|
a99130449 [PATCH] kernel-pa... |
2619 |
______________________________________________________________________ |
1da177e4c Linux-2.6.12-rc2 |
2620 2621 2622 2623 2624 |
TODO: Add documentation for ALSA options. Add more DRM drivers. |