diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 199 |
1 files changed, 59 insertions, 140 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 8ed3a7772da1..0b6815504e6d 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -43,10 +43,11 @@ parameter is applicable: AVR32 AVR32 architecture is enabled. AX25 Appropriate AX.25 support is enabled. BLACKFIN Blackfin architecture is enabled. - DRM Direct Rendering Management support is enabled. EDD BIOS Enhanced Disk Drive Services (EDD) is enabled EFI EFI Partitioning (GPT) is enabled EIDE EIDE/ATAPI support is enabled. + DRM Direct Rendering Management support is enabled. + DYNAMIC_DEBUG Build in debug messages and enable them at runtime FB The frame buffer device is enabled. GCOV GCOV profiling is enabled. HW Appropriate hardware is enabled. @@ -88,8 +89,8 @@ parameter is applicable: 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/. + A lot of drivers have their options described inside + the Documentation/scsi/ sub-directory. SECURITY Different security models are enabled. SELINUX SELinux support is enabled. APPARMOR AppArmor support is enabled. @@ -284,27 +285,12 @@ and is between 256 and 4096 characters. It is defined in the file 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. - 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. - - aha1542= [HW,SCSI] - Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] - - aic7xxx= [HW,SCSI] - See Documentation/scsi/aic7xxx.txt. - - aic79xx= [HW,SCSI] - See Documentation/scsi/aic79xx.txt. - ALSA [HW,ALSA] See Documentation/sound/alsa/alsa-parameters.txt @@ -368,8 +354,6 @@ and is between 256 and 4096 characters. It is defined in the file 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 @@ -419,10 +403,6 @@ and is between 256 and 4096 characters. It is defined in the file 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 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. @@ -476,7 +456,7 @@ and is between 256 and 4096 characters. It is defined in the file [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, pxa_timer,timer3,32k_counter,timer0_1 [AVR32] avr32 - [X86-32] pit,hpet,tsc,vmi-timer; + [X86-32] pit,hpet,tsc; scx200_hrt on Geode; cyclone on IBM x440 [MIPS] MIPS [PARISC] cr16 @@ -591,6 +571,10 @@ and is between 256 and 4096 characters. It is defined in the file Format: <port#>,<type> See also Documentation/input/joystick-parport.txt + ddebug_query= [KNL,DYNAMIC_DEBUG] Enable debug messages at early boot + time. See Documentation/dynamic-debug-howto.txt for + details. + debug [KNL] Enable kernel debugging (events log level). debug_locks_verbose= @@ -671,8 +655,6 @@ and is between 256 and 4096 characters. It is defined in the file dscc4.setup= [NET] - dtc3181e= [HW,SCSI] - dynamic_printk Enables pr_debug()/dev_dbg() calls if CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled. These can also be switched on/off via @@ -713,8 +695,6 @@ and is between 256 and 4096 characters. It is defined in the file This is desgined to be used in conjunction with the boot argument: earlyprintk=vga - eata= [HW,SCSI] - edd= [EDD] Format: {"off" | "on" | "skip[mbr]"} @@ -770,12 +750,6 @@ and is between 256 and 4096 characters. It is defined in the file Format: <interval>,<probability>,<space>,<times> See also /Documentation/fault-injection/. - fd_mcs= [HW,SCSI] - See header of drivers/scsi/fd_mcs.c. - - fdomain= [HW,SCSI] - See header of drivers/scsi/fdomain.c. - floppy= [HW] See Documentation/blockdev/floppy.txt. @@ -835,14 +809,9 @@ and is between 256 and 4096 characters. It is defined in the file 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. - gpt [EFI] Forces disk with valid GPT signature but invalid Protective MBR to be treated as GPT. - gvp11= [HW,SCSI] - hashdist= [KNL,NUMA] Large hashes allocated during boot are distributed across NUMA nodes. Defaults on for 64bit NUMA, off otherwise. @@ -915,9 +884,6 @@ and is between 256 and 4096 characters. It is defined in the file 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 @@ -934,9 +900,6 @@ and is between 256 and 4096 characters. It is defined in the file 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>]]] @@ -986,9 +949,6 @@ and is between 256 and 4096 characters. It is defined in the file 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. - init= [KNL] Format: <full_path> Run specified binary instead of /sbin/init as init @@ -1026,6 +986,12 @@ 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. + intremap= [X86-64, Intel-IOMMU] + Format: { on (default) | off | nosid } + on enable Interrupt Remapping (default) + off disable Interrupt Remapping + nosid disable Source ID checking + inttest= [IA64] iomem= Disable strict checking of access to MMIO memory @@ -1066,9 +1032,6 @@ and is between 256 and 4096 characters. It is defined in the file See comment before ip2_setup() in drivers/char/ip2/ip2base.c. - ips= [HW,SCSI] Adaptec / IBM ServeRAID controller - See header of drivers/scsi/ips.c. - irqfixup [HW] When an interrupt is not handled search all handlers for it. Intended to get systems with badly broken @@ -1168,9 +1131,13 @@ and is between 256 and 4096 characters. It is defined in the file 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. + kvm.mmu_audit= [KVM] This is a R/W parameter which allows audit + KVM MMU at runtime. Default is 0 (off) + kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM. + Default is 1 (enabled) + kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU) for all guests. Default is 1 (enabled) if in 64bit or 32bit-PAE mode @@ -1344,9 +1311,6 @@ and is between 256 and 4096 characters. It is defined in the file ltpc= [NET] Format: <io>,<irq>,<dma> - mac5380= [HW,SCSI] Format: - <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> - machvec= [IA64] Force the use of a particular machine-vector (machvec) in a generic kernel. Example: machvec=hpzx1_swiotlb @@ -1368,13 +1332,6 @@ and is between 256 and 4096 characters. It is defined in the file be mounted Format: <1-256> - max_luns= [SCSI] Maximum number of LUNs to probe. - Should be between 1 and 2^32-1. - - max_report_luns= - [SCSI] Maximum number of LUNs received. - Should be between 1 and 16384. - mcatest= [IA-64] mce [X86-32] Machine Check Exception @@ -1571,19 +1528,6 @@ and is between 256 and 4096 characters. It is defined in the file 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 @@ -1752,11 +1696,14 @@ and is between 256 and 4096 characters. It is defined in the file nointremap [X86-64, Intel-IOMMU] Do not enable interrupt remapping. + [Deprecated - use intremap=off] nointroute [IA-64] nojitter [IA64] Disables jitter checking for ITC timers. + no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver + nolapic [X86-32,APIC] Do not enable or use the local APIC. nolapic_timer [X86-32,APIC] Do not use the local APIC timer. @@ -1862,10 +1809,6 @@ and is between 256 and 4096 characters. It is defined in the file OSS [HW,OSS] See Documentation/sound/oss/oss-parameters.txt - 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> @@ -1898,9 +1841,6 @@ and is between 256 and 4096 characters. It is defined in the file Currently this function knows 686a and 8231 chips. Format: [spp|ps2|epp|ecp|ecpepp] - pas16= [HW,SCSI] - See header of drivers/scsi/pas16.c. - 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 @@ -2045,15 +1985,18 @@ and is between 256 and 4096 characters. It is defined in the file force Enable ASPM even on devices that claim not to support it. WARNING: Forcing ASPM on may cause system lockups. + pcie_ports= [PCIE] PCIe ports handling: + auto Ask the BIOS whether or not to use native PCIe services + associated with PCIe ports (PME, hot-plug, AER). Use + them only if that is allowed by the BIOS. + native Use native PCIe services associated with PCIe ports + unconditionally. + compat Treat PCIe ports as PCI-to-PCI bridges, disable the PCIe + ports driver. + pcie_pme= [PCIE,PM] Native PCIe PME signaling options: - Format: {auto|force}[,nomsi] - auto Use native PCIe PME signaling if the BIOS allows the - kernel to control PCIe config registers of root ports. - force Use native PCIe PME signaling even if the BIOS refuses - to allow the kernel to control the relevant PCIe config - registers. nomsi Do not use MSI for native PCIe PME signaling (this makes - all PCIe root ports use INTx for everything). + all PCIe root ports use INTx for all services). pcmv= [HW,PCMCIA] BadgePAD 4 @@ -2221,6 +2164,11 @@ and is between 256 and 4096 characters. It is defined in the file Reserves a hole at the top of the kernel virtual address space. + reservelow= [X86] + Format: nn[K] + Set the amount of memory to reserve for BIOS at + the bottom of the address space. + reset_devices [KNL] Force drivers to reset the underlying device during initialization. @@ -2233,6 +2181,11 @@ and is between 256 and 4096 characters. It is defined in the file in <PAGE_SIZE> units (needed only for swap files). See Documentation/power/swsusp-and-swap-files.txt + hibernate= [HIBERNATION] + noresume Don't check if there's a hibernation image + present during boot. + nocompress Don't compress/decompress hibernation images. + retain_initrd [RAM] Keep initrd memory after extraction rhash_entries= [KNL,NET] @@ -2267,30 +2220,6 @@ and is between 256 and 4096 characters. It is defined in the file sched_debug [KNL] Enables verbose scheduler debug messages. - 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) - - 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 - - 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. - 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 @@ -2324,9 +2253,6 @@ and is between 256 and 4096 characters. It is defined in the file The parameter means the number of CPUs to show, for example 1 means boot CPU only. - sim710= [SCSI,HW] - See header of drivers/scsi/sim710.c. - simeth= [IA-64] simscsi= @@ -2398,9 +2324,6 @@ and is between 256 and 4096 characters. It is defined in the file spia_pedr= spia_peddr= - st= [HW,SCSI] SCSI tape parameters (buffers, etc.) - See Documentation/scsi/st.txt. - stacktrace [FTRACE] Enabled the stack tracer on boot up. @@ -2458,8 +2381,14 @@ and is between 256 and 4096 characters. It is defined in the file switches= [HW,M68k] - sym53c416= [HW,SCSI] - See header of drivers/scsi/sym53c416.c. + sysfs.deprecated=0|1 [KNL] + Enable/disable old style sysfs layout for old udev + on older distributions. When this option is enabled + very new udev will not work anymore. When this option + is disabled (or CONFIG_SYSFS_DEPRECATED not compiled) + in older udev will not work anymore. + Default depends on CONFIG_SYSFS_DEPRECATED_V2 set in + the kernel configuration. sysrq_always_enabled [KNL] @@ -2467,9 +2396,6 @@ and is between 256 and 4096 characters. It is defined in the file neutralize any effect of /proc/sys/kernel/sysrq. Useful for debugging. - t128= [HW,SCSI] - See header of drivers/scsi/t128.c. - tdfx= [HW,DRM] test_suspend= [SUSPEND] @@ -2506,10 +2432,6 @@ and is between 256 and 4096 characters. It is defined in the file <deci-seconds>: poll all this frequency 0: no polling (default) - tmscsim= [HW,SCSI] - See comment before function dc390_setup() in - drivers/scsi/tmscsim.c. - topology= [S390] Format: {off | on} Specify if the kernel should make use of the cpu @@ -2543,6 +2465,10 @@ and is between 256 and 4096 characters. It is defined in the file disables clocksource verification at runtime. Used to enable high-resolution timer mode on older hardware, and in virtualized environment. + [x86] noirqtime: Do not use TSC to do irq accounting. + Used to run time disable IRQ_TIME_ACCOUNTING on any + platforms where RDTSC is slow and this accounting + can add overhead. turbografx.map[2|3]= [HW,JOY] TurboGraFX parallel port interface @@ -2550,9 +2476,6 @@ and is between 256 and 4096 characters. It is defined in the file <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> 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. - uhash_entries= [KNL,NET] Set number of hash buckets for UDP/UDP-Lite connections @@ -2718,12 +2641,6 @@ and is between 256 and 4096 characters. It is defined in the file overridden by individual drivers. 0 will hide cursors, 1 will display them. - wd33c93= [HW,SCSI] - See header of drivers/scsi/wd33c93.c. - - wd7000= [HW,SCSI] - See header of drivers/scsi/wd7000.c. - watchdog timers [HW,WDT] For information on watchdog timers, see Documentation/watchdog/watchdog-parameters.txt or other driver-specific files in the @@ -2749,8 +2666,10 @@ and is between 256 and 4096 characters. It is defined in the file aux-ide-disks -- unplug non-primary-master IDE devices nics -- unplug network devices all -- unplug all emulated devices (NICs and IDE disks) - ignore -- continue loading the Xen platform PCI driver even - if the version check failed + unnecessary -- unplugging emulated devices is + unnecessary even if the host did not respond to + the unplug protocol + never -- do not unplug even if version check succeeds xirc2ps_cs= [NET,PCMCIA] Format: |