diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 133 |
1 files changed, 115 insertions, 18 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index e07c432c731..e7bea3e8530 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -87,7 +87,8 @@ parameter is applicable: SH SuperH architecture is enabled. SMP The kernel is an SMP kernel. SPARC Sparc architecture is enabled. - SWSUSP Software suspend is enabled. + SWSUSP Software suspend (hibernation) is enabled. + SUSPEND System suspend states are enabled. TS Appropriate touchscreen support is enabled. USB USB support is enabled. USBHID USB Human Interface Device support is enabled. @@ -147,10 +148,16 @@ and is between 256 and 4096 characters. It is defined in the file default: 0 acpi_sleep= [HW,ACPI] Sleep options - Format: { s3_bios, s3_mode, s3_beep } + 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 } @@ -271,6 +278,17 @@ and is between 256 and 4096 characters. It is defined in the file aic79xx= [HW,SCSI] See Documentation/scsi/aic79xx.txt. + amd_iommu= [HW,X86-84] + Pass parameters to the AMD IOMMU driver in the system. + Possible values are: + isolate - enable device isolation (each device, as far + as possible, will get its own protection + domain) + 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: <a>,<b> @@ -295,7 +313,7 @@ and is between 256 and 4096 characters. It is defined in the file when initialising the APIC and IO-APIC components. apm= [APM] Advanced Power Management - See header of arch/i386/kernel/apm.c. + See header of arch/x86/kernel/apm_32.c. arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards Format: <io>,<irq>,<nodeID> @@ -560,6 +578,8 @@ and is between 256 and 4096 characters. It is defined in the file debug_objects [KNL] Enable object debugging + debugpat [X86] Enable PAT debugging + decnet.addr= [HW,NET] Format: <area>[,<node>] See also Documentation/networking/decnet.txt. @@ -599,6 +619,29 @@ and is between 256 and 4096 characters. It is defined in the file See drivers/char/README.epca and Documentation/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: <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. + disable_mtrr_trim [X86, Intel and AMD only] By default the kernel will trim any uncacheable memory out of your available memory pool based on @@ -638,7 +681,7 @@ and is between 256 and 4096 characters. It is defined in the file elanfreq= [X86-32] See comment before function elanfreq_setup() in - arch/i386/kernel/cpu/cpufreq/elanfreq.c. + arch/x86/kernel/cpu/cpufreq/elanfreq.c. elevator= [IOSCHED] Format: {"anticipatory" | "cfq" | "deadline" | "noop"} @@ -722,9 +765,6 @@ and is between 256 and 4096 characters. It is defined in the file hd= [EIDE] (E)IDE hard drive subsystem geometry Format: <cyl>,<head>,<sect> - hd?= [HW] (E)IDE subsystem - hd?lun= See Documentation/ide/ide.txt. - 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 @@ -737,8 +777,22 @@ and is between 256 and 4096 characters. It is defined in the file hisax= [HW,ISDN] See Documentation/isdn/README.HiSax. - hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages. - hugepagesz= [HW,IA-64,PPC] The size of the HugeTLB pages. + 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 + 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) + 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. i8042.direct [HW] Put keyboard port into non-translated mode i8042.dumbkbd [HW] Pretend that controller can only read data from @@ -785,7 +839,7 @@ and is between 256 and 4096 characters. It is defined in the file See Documentation/ide/ide.txt. idle= [X86] - Format: idle=poll or idle=mwait + 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. @@ -793,6 +847,9 @@ and is between 256 and 4096 characters. It is defined in the file 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. @@ -1166,7 +1223,7 @@ and is between 256 and 4096 characters. It is defined in the file or memmap=0x10000$0x18690000 - memtest= [KNL,X86_64] Enable memtest + memtest= [KNL,X86] Enable memtest Format: <integer> range: 0,4 : pattern number default : 0 <disable> @@ -1185,6 +1242,14 @@ and is between 256 and 4096 characters. It is defined in the file mga= [HW,DRM] + 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. + mousedev.tap_time= [MOUSE] Maximum time between finger touching and leaving touchpad surface for touch to be considered @@ -1208,6 +1273,11 @@ and is between 256 and 4096 characters. It is defined in the file mtdparts= [MTD] See drivers/mtd/cmdlinepart.c. + mtdset= [ARM] + ARM/S3C2412 JIVE boot control + + See arch/arm/mach-s3c2412/mach-jive.c + mtouchusb.raw_coordinates= [HW] Make the MicroTouch USB driver use raw coordinates ('y', default) or cooked coordinates ('n') @@ -1234,6 +1304,13 @@ and is between 256 and 4096 characters. It is defined in the file This usage is only documented in each driver source file if at all. + 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. + nfsaddrs= [NFS] See Documentation/filesystems/nfsroot.txt. @@ -1496,6 +1573,9 @@ and is between 256 and 4096 characters. It is defined in the file Use with caution as certain devices share address decoders between ROMs and other resources. + norom [X86-32,X86_64] Do not assign address space to + expansion ROMs that do not already have + BIOS assigned address ranges. irqmask=0xMMMM [X86-32] Set a bit mask of IRQs allowed to be assigned automatically to PCI devices. You can make the kernel exclude IRQs of your ISA cards @@ -1571,6 +1651,10 @@ and is between 256 and 4096 characters. It is defined in the file Format: { parport<nr> | timid | 0 } See also Documentation/parport.txt. + pmtmr= [X86] Manual setup of pmtmr I/O Port. + Override pmtimer IOPort with a hex value. + e.g. pmtmr=0x508 + pnpacpi= [ACPI] { off } @@ -1679,6 +1763,10 @@ and is between 256 and 4096 characters. It is defined in the file Format: <reboot_mode>[,<reboot_mode2>[,...]] See arch/*/kernel/reboot.c or arch/*/kernel/process.c + relax_domain_level= + [KNL, SMP] Set scheduler's default relax_domain_level. + See Documentation/cpusets.txt. + reserve= [KNL,BUGS] Force the kernel to ignore some iomem area reservetop= [X86-32] @@ -1971,6 +2059,9 @@ and is between 256 and 4096 characters. It is defined in the file snd-ymfpci= [HW,ALSA] + softlockup_panic= + [KNL] Should the soft-lockup detector generate panics. + sonypi.*= [HW] Sony Programmable I/O Control Device driver See Documentation/sonypi.txt @@ -2035,6 +2126,12 @@ and is between 256 and 4096 characters. It is defined in the file tdfx= [HW,DRM] + 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. + thash_entries= [KNL,NET] Set number of hash buckets for TCP connection @@ -2062,13 +2159,6 @@ and is between 256 and 4096 characters. It is defined in the file <deci-seconds>: poll all this frequency 0: no polling (default) - tipar.timeout= [HW,PPT] - Set communications timeout in tenths of a second - (default 15). - - tipar.delay= [HW,PPT] - Set inter-bit delay in microseconds (default 10). - tmscsim= [HW,SCSI] See comment before function dc390_setup() in drivers/scsi/tmscsim.c. @@ -2102,6 +2192,10 @@ and is between 256 and 4096 characters. It is defined in the file Note that genuine overcurrent events won't be reported either. + unknown_nmi_panic + [X86-32,X86-64] + Set unknown_nmi_panic=1 early on boot. + usbcore.autosuspend= [USB] The autosuspend time delay (in seconds) used for newly-detected USB devices (default 2). This @@ -2112,6 +2206,9 @@ and is between 256 and 4096 characters. It is defined in the file usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. + 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=2: enable compat VDSO (default with COMPAT_VDSO) vdso=1: enable VDSO (default) |