X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=Documentation%2Fkernel-parameters.txt;h=ab95d3ada5c7f7210d2a13adc619ec3d4b9548bd;hb=dee5d0d518defd0337a41f1a504428c9acc87be5;hp=a58fc8b73398252ab774edd310de0b6822229298;hpb=c838ea4626d6e982489ff519f9ecf5e1649ca90b;p=safe%2Fjmp%2Flinux-2.6 diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a58fc8b..ab95d3a 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -17,6 +17,12 @@ are specified on the kernel command line with the module name plus usbcore.blinkenlights=1 +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 + + 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 @@ -42,13 +48,16 @@ parameter is applicable: EFI EFI Partitioning (GPT) is enabled EIDE EIDE/ATAPI support is enabled. FB The frame buffer device is enabled. + GCOV GCOV profiling is enabled. HW Appropriate hardware is enabled. IA-64 IA-64 architecture is enabled. + IMA Integrity measurement architecture is enabled. IOSCHED More than one I/O scheduler is enabled. IP_PNP IP DHCP, BOOTP, or RARP is enabled. ISAPNP ISA PnP code is enabled. ISDN Appropriate ISDN support is enabled. JOY Appropriate joystick support is enabled. + KVM Kernel Virtual Machine support is enabled. LIBATA Libata driver is enabled LP Printer support is enabled. LOOP Loopback device support is enabled. @@ -76,7 +85,6 @@ parameter is applicable: PPT Parallel port support is enabled. PS2 Appropriate PS/2 support is enabled. RAM RAM disk support is enabled. - ROOTPLUG The example Root Plug LSM is enabled. S390 S390 architecture is enabled. SCSI Appropriate SCSI support is enabled. A lot of drivers has their options described inside of @@ -114,7 +122,7 @@ In addition, the following text indicates that the option: 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 -need or coordination with . +need or coordination with . There are also arch-specific kernel-parameters not documented here. See for example . @@ -132,15 +140,16 @@ and is between 256 and 4096 characters. It is defined in the file ./include/asm/setup.h as COMMAND_LINE_SIZE. - acpi= [HW,ACPI,X86-64,i386] + acpi= [HW,ACPI,X86] Advanced Configuration and Power Interface - Format: { force | off | ht | strict | noirq } + Format: { force | off | ht | strict | noirq | rsdt } 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 strict -- Be less tolerant of platforms that are not strictly ACPI specification compliant. + rsdt -- prefer RSDT over (default) XSDT See also Documentation/power/pm.txt, pci=noacpi @@ -150,56 +159,6 @@ and is between 256 and 4096 characters. It is defined in the file 1,0: use 1st APIC table default: 0 - acpi_sleep= [HW,ACPI] Sleep options - Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering } - See Documentation/power/video.txt for 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, wrt putting devices into low power - states, to be enforced (the ACPI 2.0 ordering of _PTS is - used by default). - - acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode - Format: { level | edge | high | low } - - 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_pci= [HW,ACPI] If irq_balance, clear listed IRQs for - use by PCI - Format: ,... - - acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA - Format: ,... - - 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 - - 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_use_timer_override [HW,ACPI} - Use timer override. For some broken Nvidia NF5 boards - that require a timer override, but don't have - HPET - acpi_backlight= [HW,ACPI] acpi_backlight=vendor acpi_backlight=video @@ -207,11 +166,6 @@ and is between 256 and 4096 characters. It is defined in the file (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver. - acpi_display_output= [HW,ACPI] - acpi_display_output=vendor - acpi_display_output=video - See above. - acpi.debug_layer= [HW,ACPI,ACPI_DEBUG] acpi.debug_level= [HW,ACPI,ACPI_DEBUG] Format: @@ -240,38 +194,92 @@ and is between 256 and 4096 characters. It is defined in the file unusable. The "log_buf_len" parameter may be useful if you need to capture more output. - acpi.power_nocheck= [HW,ACPI] - Format: 1/0 enable/disable the check of power state. - On some bogus BIOS the _PSC object/_STA object of - power resource can't return the correct device power - state. In such case it is unneccessary to check its - power state again in power transition. - 1 : disable the power state check + 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: ,... + + acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for + use by PCI + Format: ,... + + 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 - acpi_pm_good [X86-32,X86-64] + acpi_pm_good [X86] Override the pmtimer bug detection: force the kernel to assume that this machine's pmtimer latches its value and always returns good values. - agp= [AGP] - { off | try_unsupported } - off: disable AGP support - try_unsupported: try to drive unsupported chipsets - (may crash computer or cause data corruption) + acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode + Format: { level | edge | high | low } - enable_timer_pin_1 [i386,x86-64] - 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. + acpi_serialize [HW,ACPI] force serialization of AML methods - disable_timer_pin_1 [i386,x86-64] - Disable PIN 1 of APIC timer - Can be useful to work around chipset bugs. + 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, + old_ordering, s4_nonvs } + 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. + + 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 + + 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. ad1848= [HW,OSS] Format: ,,,, + add_efi_memmap [EFI; X86] Include EFI memory map in + kernel's map of available physical RAM. + advansys= [HW,SCSI] See header of drivers/scsi/advansys.c. @@ -282,6 +290,12 @@ and is between 256 and 4096 characters. It is defined in the file Format: ,,,,, See also header of sound/oss/aedsp16.c. + agp= [AGP] + { off | try_unsupported } + off: disable AGP support + try_unsupported: try to drive unsupported chipsets + (may crash computer or cause data corruption) + aha152x= [HW,SCSI] See Documentation/scsi/aha152x.txt. @@ -307,11 +321,6 @@ and is between 256 and 4096 characters. It is defined in the file flushed before they will be reused, which is a lot of faster - amd_iommu_size= [HW,X86-64] - Define the size of the aperture for the AMD IOMMU - driver. Possible values are: - '32M', '64M' (default), '128M', '256M', '512M', '1G' - amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: , @@ -329,12 +338,21 @@ and is between 256 and 4096 characters. It is defined in the file not play well with APC CPU idle - disable it if you have APC and your system crashes randomly. - apic= [APIC,i386] Advanced Programmable Interrupt Controller + apic= [APIC,X86-32] Advanced Programmable Interrupt Controller Change the output verbosity whilst booting Format: { quiet (default) | verbose | debug } Change the amount of debugging information output when initialising the APIC and IO-APIC components. + 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 + apm= [APM] Advanced Power Management See header of arch/x86/kernel/apm_32.c. @@ -409,12 +427,6 @@ and is between 256 and 4096 characters. It is defined in the file possible to determine what the correct size should be. This option provides an override for these situations. - 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. - capability.disable= [SECURITY] Disable capabilities. This would normally be used only if an alternative security model is to be @@ -481,17 +493,18 @@ and is between 256 and 4096 characters. It is defined in the file Also note the kernel might malfunction if you disable some critical bits. - code_bytes [IA32/X86_64] How many bytes of object code to print + 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 + + code_bytes [X86] How many bytes of object code to print in an oops report. Range: 0 - 8192 Default: 64 - hpet= [X86-32,HPET] option to control HPET usage - Format: { enable (default) | disable | force } - disable: disable HPET and use PIT instead - force: allow force enabled of undocumented chips (ICH4, - VIA, nVidia) - com20020= [HW,NET] ARCnet - COM20020 chipset Format: [,[,[,[,[,]]]]] @@ -535,22 +548,9 @@ and is between 256 and 4096 characters. It is defined in the file console=brl,ttyS0 For now, only VisioBraille is supported. - earlycon= [KNL] Output early console device and options. - uart[8250],io,[,options] - uart[8250],mmio,[,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. - - 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. + consoleblank= [KNL] The console blank (screen saver) timeout in + seconds. Defaults to 10*60 = 10mins. A value of 0 + disables the blank timer. coredump_filter= [KNL] Change the default value for @@ -572,9 +572,6 @@ and is between 256 and 4096 characters. It is defined in the file a memory unit (amount[KMG]). See also Documentation/kdump/kdump.txt for a example. - cs4232= [HW,OSS] - Format: ,,,,, - cs89x0_dma= [HW,NET] Format: @@ -602,36 +599,22 @@ and is between 256 and 4096 characters. It is defined in the file debug_objects [KNL] Enable object debugging + no_debug_objects + [KNL] Disable object debugging + debugpat [X86] Enable PAT debugging decnet.addr= [HW,NET] Format: [,] See also Documentation/networking/decnet.txt. - vt.default_blu= [VT] - Format: ,,,..., - 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: ,,,..., - 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: ,,,..., - 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. + 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. dhash_entries= [KNL] Set number of hash buckets for dentry cache. @@ -644,27 +627,9 @@ and is between 256 and 4096 characters. It is defined in the file Documentation/serial/digiepca.txt. disable_mtrr_cleanup [X86] - 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/disables that. - - mtrr_chunk_size=nn[KMG] [X86] - used for mtrr cleanup. It is largest continous chunk - 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: - 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. + entry later. This parameter disables that. disable_mtrr_trim [X86, Intel and AMD only] By default the kernel will trim any uncacheable @@ -672,16 +637,50 @@ and is between 256 and 4096 characters. It is defined in the file MTRR settings. This parameter disables that behavior, possibly causing your machine to run very slowly. + disable_timer_pin_1 [X86] + Disable PIN 1 of APIC timer + Can be useful to work around chipset bugs. + dmasound= [HW,OSS] Sound subsystem buffers + dma_debug=off If the kernel is compiled with DMA_API_DEBUG support, + this option disables the debugging code at boot. + + dma_debug_entries= + 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. + + dma_debug_driver= + 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. + dscc4.setup= [NET] dtc3181e= [HW,SCSI] - earlyprintk= [X86-32,X86-64,SH,BLACKFIN] + dynamic_printk Enables pr_debug()/dev_dbg() calls if + CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled. + These can also be switched on/off via + /dynamic_printk/modules + + earlycon= [KNL] Output early console device and options. + uart[8250],io,[,options] + uart[8250],mmio,[,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. + + earlyprintk= [X86,SH,BLACKFIN] earlyprintk=vga earlyprintk=serial[,ttySn[,baudrate]] - earlyprintk=dbgp + earlyprintk=ttySn[,baudrate] + earlyprintk=dbgp[debugController#] Append ",keep" to not disable it when the real console takes over. @@ -713,12 +712,23 @@ and is between 256 and 4096 characters. It is defined in the file See Documentation/block/as-iosched.txt and Documentation/block/deadline-iosched.txt for details. - elfcorehdr= [IA64,PPC,SH,X86-32,X86_64] + elfcorehdr= [IA64,PPC,SH,X86] Specifies physical address of start of kernel core image elf header. Generally kexec loader will pass this option to capture kernel. See Documentation/kdump/kdump.txt for details. + 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. + + enable_timer_pin_1 [X86] + 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. + enforcing [SELINUX] Set initial enforcing status. Format: {"0" | "1"} See security/selinux/Kconfig help text. @@ -727,10 +737,6 @@ and is between 256 and 4096 characters. It is defined in the file Default value is 0. Value can be changed at runtime via /selinux/enforce. - es1371= [HW,OSS] - Format: ,[,[]] - See also header of sound/oss/es1371.c. - ether= [HW,NET] Ethernet cards parameters This option is obsoleted by the "netdev=" option, which has equivalent usage. See its documentation for details. @@ -761,12 +767,32 @@ and is between 256 and 4096 characters. It is defined in the file ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. ftrace=[tracer] - [ftrace] will set and start the specified tracer + [FTRACE] will set and start the specified tracer as early as possible in order to facilitate early boot debugging. ftrace_dump_on_oops - [ftrace] will dump the trace buffers on oops. + [FTRACE] will dump the trace buffers on oops. + + 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. + + 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. gamecon.map[2|3]= [HW,JOY] Multisystem joystick and NES/SNES/PSX pad @@ -780,6 +806,12 @@ and is between 256 and 4096 characters. It is defined in the file Format: off | on default: on + 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. + gdth= [HW,SCSI] See header of drivers/scsi/gdth.c. @@ -790,7 +822,7 @@ and is between 256 and 4096 characters. It is defined in the file hashdist= [KNL,NUMA] Large hashes allocated during boot are distributed across NUMA nodes. Defaults on - for IA-64, off otherwise. + for 64bit NUMA, off otherwise. Format: 0 | 1 (for off | on) hcl= [IA-64] SGI's Hardware Graph compatibility layer @@ -810,6 +842,16 @@ and is between 256 and 4096 characters. It is defined in the file hisax= [HW,ISDN] See Documentation/isdn/README.HiSax. + 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 + 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. On x86-64 and powerpc, this option can be specified @@ -819,18 +861,18 @@ and is between 256 and 4096 characters. It is defined in the file (when the CPU supports the "pdpe1gb" cpuinfo flag) Note that 1GB pages can only be allocated at boot time using hugepages= and not freed afterwards. - 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. - hlt [BUGS=ARM,SH] + hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC) + terminal devices. Valid values: 0..8 + 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. - hvc_iucv= [S390] Number of z/VM IUCV Hypervisor console (HVC) - back-ends. Valid parameters: 0..8 + i2c_bus= [HW] Override the default board specific I2C bus speed + or register an additional I2C bus that is not + registered from board initialization code. + Format: + , i8042.debug [HW] Toggle i8042 debug mode i8042.direct [HW] Put keyboard port into non-translated mode @@ -870,28 +912,29 @@ and is between 256 and 4096 characters. It is defined in the file icn= [HW,ISDN] Format: [,[,[,]]] - ide= [HW] (E)IDE subsystem - Format: ide=nodma or ide=doubler + ide-core.nodma= [HW] (E)IDE subsystem + Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc + .vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr + .cdrom .chs .ignore_cable are additional options See Documentation/ide/ide.txt. - idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed - See Documentation/ide/ide.txt. + ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem + Claim all unknown PCI IDE storage controllers. idle= [X86] - Format: idle=poll or idle=mwait, idle=halt, idle=nomwait - Poll forces a polling idle loop that can slightly improves 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. + 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. In such case C2/C3 won't be used again. - idle=nomwait. Disable mwait for CPU C-states - - ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem - Claim all unknown PCI IDE storage controllers. + idle=nomwait: Disable mwait for CPU C-states ignore_loglevel [KNL] Ignore loglevel setting - this will print /all/ @@ -900,6 +943,21 @@ and is between 256 and 4096 characters. It is defined in the file ihash_entries= [KNL] Set number of hash buckets for inode cache. + ima_audit= [IMA] + Format: { "0" | "1" } + 0 -- integrity auditing messages. (Default) + 1 -- enable informational integrity auditing messages. + + ima_hash= [IMA] + Format: { "sha1" | "md5" } + default: "sha1" + + 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. + in2000= [HW,SCSI] See header of drivers/scsi/in2000.c. @@ -917,22 +975,9 @@ and is between 256 and 4096 characters. It is defined in the file inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver Format: - inttest= [IA64] - - iommu= [x86] - off - force - noforce - biomerge - panic - nopanic - merge - nomerge - forcesac - soft - - intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option + on + Enable intel iommu driver. off Disable intel iommu driver. igfx_off [Default Off] @@ -953,7 +998,30 @@ and is between 256 and 4096 characters. It is defined in the file result in a hardware IOTLB flush operation as opposed to batching them for performance. - io_delay= [X86-32,X86-64] I/O delay method + 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 + pt [x86, IA64] + + io7= [HW] IO7 for Marvel based alpha systems + See comment before marvel_specify_io7 in + arch/alpha/kernel/core_marvel.c. + + io_delay= [X86] I/O delay method 0x80 Standard port 0x80 based delay 0xed @@ -963,10 +1031,6 @@ and is between 256 and 4096 characters. It is defined in the file none No delay - io7= [HW] IO7 for Marvel based alpha systems - See comment before marvel_specify_io7 in - arch/alpha/kernel/core_marvel.c. - ip= [IP_PNP] See Documentation/filesystems/nfsroot.txt. @@ -977,12 +1041,6 @@ and is between 256 and 4096 characters. It is defined in the file ips= [HW,SCSI] Adaptec / IBM ServeRAID controller See header of drivers/scsi/ips.c. - ports= [IP_VS_FTP] IPVS ftp helper module - Default is 21. - Up to 8 (IP_VS_APP_MAX_PORTS) ports - may be specified. - Format: ,.... - irqfixup [HW] When an interrupt is not handled search all handlers for it. Intended to get systems with badly broken @@ -1023,7 +1081,9 @@ and is between 256 and 4096 characters. It is defined in the file js= [HW,JOY] Analog joystick See Documentation/input/joystick.txt. - kernelcore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter + keepinitrd [HW,ARM] + + kernelcore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter 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 @@ -1039,30 +1099,60 @@ and is between 256 and 4096 characters. It is defined in the file use the HighMem zone if it exists, and the Normal zone if it does not. - movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter - 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. - - keepinitrd [HW,ARM] - - kstack=N [X86-32,X86-64] Print N words from the kernel stack - in oops dumps. - kgdboc= [HW] kgdb over consoles. Requires a tty driver that supports console polling. - (only serial suported for now) + (only serial supported for now) Format: [,baud] kmac= [MIPS] korina ethernet MAC address. Configure the RouterBoard 532 series on-chip Ethernet adapter MAC address. + kmemleak= [KNL] Boot-time kmemleak enable/disable + Valid arguments: on, off + Default: on + + kstack=N [X86] Print N words from the kernel stack + in oops dumps. + + 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) + l2cr= [PPC] l3cr= [PPC] @@ -1070,8 +1160,8 @@ and is between 256 and 4096 characters. It is defined in the file lapic [X86-32,APIC] Enable the local APIC even if BIOS disabled it. - lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer in - C2 power state. + lapic_timer_c2_ok [X86,APIC] trust the local apic timer + in C2 power state. libata.dma= [LIBATA] DMA control libata.dma=0 Disable all PATA and SATA DMA @@ -1080,6 +1170,10 @@ and is between 256 and 4096 characters. It is defined in the file libata.dma=4 Compact Flash DMA only Combinations also work, so libata.dma=3 enables DMA for disks and CDROMs, but not CFs. + + libata.ignore_hpa= [LIBATA] Ignore HPA limit + libata.ignore_hpa=0 keep BIOS limits (default) + libata.ignore_hpa=1 ignore limits, using full disk libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume when set. @@ -1208,9 +1302,12 @@ and is between 256 and 4096 characters. It is defined in the file (machvec) in a generic kernel. Example: machvec=hpzx1_swiotlb - max_loop= [LOOP] Maximum number of loopback devices that can - be mounted - Format: <1-256> + machtype= [Loongson] Share the same kernel image file between different + yeeloong laptop. + Example: machtype=lemote-yeeloong-2f-7inch + + max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater + than or equal to this physical address is ignored. maxcpus= [SMP] Maximum number of processors that an SMP kernel should make use of. maxcpus=n : n >= 0 limits the @@ -1218,8 +1315,9 @@ and is between 256 and 4096 characters. It is defined in the file it is equivalent to "nosmp", which also disables the IO APIC. - max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater than - or equal to this physical address is ignored. + max_loop= [LOOP] Maximum number of loopback devices that can + be mounted + Format: <1-256> max_luns= [SCSI] Maximum number of LUNs to probe. Should be between 1 and 2^32-1. @@ -1255,7 +1353,7 @@ and is between 256 and 4096 characters. It is defined in the file [KNL,SH] Allow user to override the default size for per-device physically contiguous DMA buffers. - memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact + memmap=exactmap [KNL,X86] Enable setting of an exact 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 @@ -1302,8 +1400,13 @@ and is between 256 and 4096 characters. It is defined in the file memtest= [KNL,X86] Enable memtest Format: - range: 0,4 : pattern number default : 0 + 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. meye.*= [HW] Set MotionEye Camera parameters See Documentation/video4linux/meye.txt. @@ -1322,6 +1425,27 @@ and is between 256 and 4096 characters. It is defined in the file min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this physical address is ignored. + 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 + mminit_loglevel= [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this parameter allows control of the logging verbosity for @@ -1341,6 +1465,16 @@ and is between 256 and 4096 characters. It is defined in the file mousedev.yres= [MOUSE] Vertical screen resolution, used for devices reporting absolute coordinates, such as tablets + movablecore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter + 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. + mpu401= [HW,OSS] Format: , @@ -1353,6 +1487,16 @@ and is between 256 and 4096 characters. It is defined in the file mtdparts= [MTD] See drivers/mtd/cmdlinepart.c. + 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. + mtdset= [ARM] ARM/S3C2412 JIVE boot control @@ -1362,6 +1506,23 @@ and is between 256 and 4096 characters. It is defined in the file [HW] Make the MicroTouch USB driver use raw coordinates ('y', default) or cooked coordinates ('n') + mtrr_chunk_size=nn[KMG] [X86] + used for mtrr cleanup. It is largest continuous chunk + 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: + 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. + n2= [NET] SDL Inc. RISCom/N2 synchronous serial card NCR_D700= [HW,SCSI] @@ -1401,6 +1562,14 @@ and is between 256 and 4096 characters. It is defined in the file [NFS] set the TCP port on which the NFSv4 callback channel should listen. + 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. + nfs.idmap_cache_timeout= [NFS] set the maximum lifetime for idmapper cache entries. @@ -1412,29 +1581,46 @@ and is between 256 and 4096 characters. It is defined in the file of returning the full 64-bit number. The default is to return 64-bit inode numbers. - nmi_debug= [KNL,AVR32] Specify one or more actions to take + nmi_debug= [KNL,AVR32,SH] Specify one or more actions to take when a NMI is triggered. Format: [state][,regs][,debounce][,die] - nmi_watchdog= [KNL,BUGS=X86-32,X86-64] Debugging features for SMP kernels + nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels 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 - 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. + 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. 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 + netpoll.carrier_timeout= + [NET] Specifies amount of time (in seconds) that + netpoll should wait for a carrier. By default netpoll + waits 4 seconds. + no387 [BUGS=X86-32] Tells the kernel to use the 387 maths emulation library even if a 387 maths coprocessor is present. + 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. + noaliencache [MM, NUMA, SLAB] Disables the allocation of alien caches in the slab allocator. Saves per-node memory, but will impact performance. @@ -1449,17 +1635,19 @@ and is between 256 and 4096 characters. It is defined in the file nocache [ARM] + noclflush [BUGS=X86] Don't use the CLFLUSH instruction + nodelayacct [KNL] Disable per-task delay accounting nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. nodsp [SH] Disable hardware DSP at boot time. - noefi [X86-32,X86-64] Disable EFI runtime services support. + noefi [X86] Disable EFI runtime services support. noexec [IA-64] - noexec [X86-32,X86-64] + noexec [X86] On X86-32 available only on PAE configured kernels. noexec=on: enable non-executable mappings (default) noexec=off: disable non-executable mappings @@ -1477,9 +1665,13 @@ and is between 256 and 4096 characters. It is defined in the file register save and restore. The kernel will only save legacy floating-point registers on task switch. - noclflush [BUGS=X86] Don't use the CLFLUSH instruction + 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. - nohlt [BUGS=ARM,SH] + 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. no-hlt [BUGS=X86-32] Tells the kernel that the hlt instruction doesn't work correctly and not to @@ -1500,10 +1692,12 @@ and is between 256 and 4096 characters. It is defined in the file Valid arguments: on, off Default: on + noiotrap [SH] Disables trapped I/O port accesses. + noirqdebug [X86-32] Disables the code which attempts to detect and disable unhandled interrupt sources. - no_timer_check [X86-32,X86_64,APIC] Disables the code which tests for + no_timer_check [X86,APIC] Disables the code which tests for broken timer IRQ sources. noisapnp [ISAPNP] Disables ISA PnP code. @@ -1511,6 +1705,9 @@ and is between 256 and 4096 characters. It is defined in the file noinitrd [RAM] Tells the kernel not to load any configured initial RAM disk. + nointremap [X86-64, Intel-IOMMU] Do not enable interrupt + remapping. + nointroute [IA-64] nojitter [IA64] Disables jitter checking for ITC timers. @@ -1519,12 +1716,6 @@ and is between 256 and 4096 characters. It is defined in the file nolapic_timer [X86-32,APIC] Do not use the local APIC timer. - nox2apic [X86-64,APIC] Do not enable x2APIC mode. - - x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of - default x2apic cluster mode on platforms - supporting x2apic. - noltlbs [PPC] Do not use large page/tlb entries for kernel lowmem mapping on PPC40x. @@ -1535,6 +1726,9 @@ and is between 256 and 4096 characters. It is defined in the file nomfgpt [X86-32] Disable Multi-Function General Purpose Timer usage (for AMD Geode machines). + norandmaps Don't use address space randomization. Equivalent to + echo 0 > /proc/sys/kernel/randomize_va_space + noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops noreplace-smp [X86-32,SMP] Don't replace SMP instructions @@ -1558,6 +1752,9 @@ and is between 256 and 4096 characters. It is defined in the file nosoftlockup [KNL] Disable the soft-lockup detector. + noswapaccount [KNL] Disable accounting of swap in memory resource + controller. (See Documentation/cgroups/memory.txt) + nosync [HW,M68K] Disables sync negotiation for all devices. notsc [BUGS=X86-32] Disable Time Stamp Counter @@ -1566,17 +1763,19 @@ and is between 256 and 4096 characters. It is defined in the file nowb [ARM] + nox2apic [X86-64,APIC] Do not enable x2APIC mode. + nptcg= [IA64] Override max number of concurrent global TLB purges which is reported from either PAL_VM_SUMMARY or SAL PALO. + nr_uarts= [SERIAL] maximum number of UARTs to be registered. + 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. - nr_uarts= [SERIAL] maximum number of UARTs to be registered. - ohci1394_dma=early [HW] enable debugging via the ohci1394 driver. See Documentation/debugging-via-ohci1394.txt for more info. @@ -1588,12 +1787,25 @@ and is between 256 and 4096 characters. It is defined in the file waiting for the ACK, so if this is set too high interrupts *may* be lost! + omap_mux= [OMAP] Override bootloader pin multiplexing. + Format: ... + For example, to override I2C bus2: + omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100 + opl3= [HW,OSS] Format: oprofile.timer= [HW] Use timer interrupt instead of performance counters + 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. + Format: { arch_perfmon } + arch_perfmon: [X86] Force use of architectural + perfmon on Intel CPUs instead of the + CPU specific event set. + osst= [HW,SCSI] SCSI Tape Driver Format: , See also Documentation/scsi/st.txt. @@ -1648,6 +1860,8 @@ and is between 256 and 4096 characters. It is defined in the file See also Documentation/blockdev/paride.txt. pci=option[,option...] [PCI] various PCI subsystem options: + earlydump [X86] dump PCI config space before the kernel + changes anything off [X86] don't probe for the PCI bus bios [X86-32] force use of PCI BIOS, don't access the hardware directly. Use this if your machine @@ -1665,8 +1879,11 @@ and is between 256 and 4096 characters. It is defined in the file disable the use of PCIE advanced error reporting. nodomains [PCI] Disable support for multiple PCI root domains (aka PCI segments, in ACPI-speak). - nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI + nommconf [X86] Disable use of MMCONFIG for PCI Configuration + check_enable_amd_mmconf [X86] check for and enable + properly configured MMIO access to PCI + config space on AMD family 10h CPU 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. @@ -1747,6 +1964,21 @@ and is between 256 and 4096 characters. It is defined in the file 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. + resource_alignment= + Format: + [@][:]:.[; ...] + Specifies alignment and device to reassign + aligned memory resources. + If is not specified, + PAGE_SIZE is used as alignment. + PCI-PCI bridge can be specified, if resource + windows need to be expanded. + 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. pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power Management. @@ -1764,6 +1996,13 @@ and is between 256 and 4096 characters. It is defined in the file Format: { 0 | 1 } See arch/parisc/kernel/pdc_chassis.c + percpu_alloc= Select which percpu first chunk allocator to use. + 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. + pf. [PARIDE] See Documentation/blockdev/paride.txt. @@ -1805,20 +2044,36 @@ and is between 256 and 4096 characters. It is defined in the file autoconfiguration. Ranges are in pairs (memory base and size). - dynamic_printk Enables pr_debug()/dev_dbg() calls if - CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled. - These can also be switched on/off via - /dynamic_printk/modules + ports= [IP_VS_FTP] IPVS ftp helper module + Default is 21. + Up to 8 (IP_VS_APP_MAX_PORTS) ports + may be specified. + Format: ,.... print-fatal-signals= [KNL] debug: print fatal signals - print-fatal-signals=1: print segfault info to - the kernel console. + + 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". + default: off. printk.time= Show timing data prefixed to each printk message line Format: (1/Y/y=enable, 0/N/n=disable) + 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 + profile= [KNL] Enable kernel profiling via /proc/profile Format: [schedule,] Param: "schedule" - profile schedule points. @@ -1828,14 +2083,6 @@ and is between 256 and 4096 characters. It is defined in the file Requires CONFIG_SCHEDSTATS Param: "kvm" - profile VM exits. - 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 - prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk before loading. See Documentation/blockdev/ramdisk.txt. @@ -1900,7 +2147,7 @@ and is between 256 and 4096 characters. It is defined in the file relax_domain_level= [KNL, SMP] Set scheduler's default relax_domain_level. - See Documentation/cpusets.txt. + See Documentation/cgroups/cpusets.txt. reserve= [KNL,BUGS] Force the kernel to ignore some iomem area @@ -1944,15 +2191,6 @@ and is between 256 and 4096 characters. It is defined in the file Useful for devices that are detected asynchronously (e.g. USB and MMC devices). - root_plug.vendor_id= - [ROOTPLUG] Override the default vendor ID - - root_plug.product_id= - [ROOTPLUG] Override the default product ID - - root_plug.debug= - [ROOTPLUG] Enable debugging output - rw [KNL] Mount root device read-write on boot S [KNL] Run init in single mode @@ -1962,6 +2200,8 @@ and is between 256 and 4096 characters. It is defined in the file sbni= [NET] Granch SBNI12 leased line adapter + sched_debug [KNL] Enables verbose scheduler debug messages. + sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver Format: [,[,]] @@ -1989,7 +2229,13 @@ and is between 256 and 4096 characters. It is defined in the file allowing boot to proceed. none ignores them, expecting user space to do the scan. - selinux [SELINUX] Disable or enable SELinux at boot time. + 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. Format: { "0" | "1" } See security/selinux/Kconfig help text. 0 -- disable. @@ -1998,15 +2244,6 @@ and is between 256 and 4096 characters. It is defined in the file If enabled at boot time, /selinux/disable can be used later to disable prior to initial policy load. - selinux_compat_net = - [SELINUX] Set initial selinux_compat_net flag value. - Format: { "0" | "1" } - 0 -- use new secmark-based packet controls - 1 -- use legacy packet controls - Default value is 0 (preferred). - Value can be changed at runtime via - /selinux/compat_net. - serialnumber [BUGS=X86-32] shapers= [NET] @@ -2236,6 +2473,18 @@ and is between 256 and 4096 characters. It is defined in the file stifb= [HW] Format: bpp:[:[:...]] + 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. + sunrpc.pool_mode= [NFS] Control how the NFS server code allocates CPUs to @@ -2252,6 +2501,15 @@ and is between 256 and 4096 characters. It is defined in the file pernode one pool for each NUMA node (equivalent to global on non-NUMA machines) + 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. + swiotlb= [IA-64] Number of I/O TLB slabs switches= [HW,M68k] @@ -2296,7 +2554,8 @@ and is between 256 and 4096 characters. It is defined in the file thermal.psv= [HW,ACPI] -1: disable all passive trip points - : override all passive trip points to this value + : override all passive trip points to this + value thermal.tzp= [HW,ACPI] Specify global default ACPI thermal zone polling rate @@ -2317,6 +2576,14 @@ and is between 256 and 4096 characters. It is defined in the file tp720= [HW,PS2] + trace_buf_size=nn[KMG] + [FTRACE] will set tracing buffer size. + + trace_event=[event-list] + [FTRACE] Set and start specified trace events in order + to facilitate early boot debugging. + See also Documentation/trace/events.txt + trix= [HW,OSS] MediaTrix AudioTrix Pro Format: ,,,,,,,, @@ -2343,6 +2610,9 @@ and is between 256 and 4096 characters. It is defined in the file uart6850= [HW,OSS] Format: , + uhash_entries= [KNL,NET] + Set number of hash buckets for UDP/UDP-Lite connections + uhci-hcd.ignore_oc= [USB] Ignore overcurrent events (default N). Some badly-designed motherboards generate lots of @@ -2352,7 +2622,7 @@ and is between 256 and 4096 characters. It is defined in the file reported either. unknown_nmi_panic - [X86-32,X86-64] + [X86] Set unknown_nmi_panic=1 early on boot. usbcore.autosuspend= @@ -2398,6 +2668,8 @@ and is between 256 and 4096 characters. It is defined in the file to a common usb-storage quirk flag as follows: a = SANE_SENSE (collect more than 18 bytes of sense data); + b = BAD_SENSE (don't collect more than 18 + bytes of sense data); c = FIX_CAPACITY (decrease the reported device capacity by one sector); h = CAPACITY_HEURISTICS (decrease the @@ -2419,15 +2691,12 @@ and is between 256 and 4096 characters. It is defined in the file medium is write-protected). Example: quirks=0419:aaf5:rl,0421:0433:rc - add_efi_memmap [EFI; x86-32,X86-64] Include EFI memory map in - kernel's map of available physical RAM. - - vdso= [X86-32,SH,x86-64] + vdso= [X86,SH] vdso=2: enable compat VDSO (default with COMPAT_VDSO) vdso=1: enable VDSO (default) vdso=0: disable VDSO mapping - vdso32= [X86-32,X86-64] + vdso32= [X86] vdso32=2: enable compat VDSO (default with COMPAT_VDSO) vdso32=1: enable 32-bit VDSO (default) vdso32=0: disable 32-bit VDSO mapping @@ -2439,7 +2708,7 @@ and is between 256 and 4096 characters. It is defined in the file See Documentation/fb/modedb.txt. vga= [BOOT,X86-32] Select a particular video mode - See Documentation/x86/i386/boot.txt and + See Documentation/x86/boot.txt and Documentation/svga.txt. Use vga=ask for menu. This is actually a boot loader parameter; the value is @@ -2460,6 +2729,40 @@ and is between 256 and 4096 characters. It is defined in the file vmpoff= [KNL,S390] Perform z/VM CP command after power off. Format: + vt.default_blu= [VT] + Format: ,,,..., + 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: ,,,..., + 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: ,,,..., + 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. + + 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. + waveartist= [HW,OSS] Format: ,,, @@ -2472,6 +2775,10 @@ and is between 256 and 4096 characters. It is defined in the file wdt= [WDT] Watchdog See Documentation/watchdog/wdt.txt. + x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of + default x2apic cluster mode on platforms + supporting x2apic. + xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. xd_geo= See header of drivers/block/xd.c. @@ -2479,9 +2786,6 @@ and is between 256 and 4096 characters. It is defined in the file Format: ,,,,,[,[,[,]]] - norandmaps Don't use address space randomization. Equivalent to - echo 0 > /proc/sys/kernel/randomize_va_space - ______________________________________________________________________ TODO: