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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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ARM ARM architecture 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. DYNAMIC_DEBUG Build in debug messages and enable them at runtime |
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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. |
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EVM Extended Verification Module |
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FB The frame buffer device is enabled. |
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FTRACE Function tracing 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. |
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MDA MDA console support is enabled. |
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MIPS MIPS architecture is enabled. |
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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. 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. |
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A lot of drivers have their options described inside the Documentation/scsi/ sub-directory. |
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SECURITY Different security models are enabled. |
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SELINUX SELinux support is enabled. |
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APPARMOR AppArmor support is enabled. |
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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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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. |
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VMMIO Driver for memory mapped virtio devices is enabled. |
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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 32-bit or 64-bit x86 (same as X86-32+X86-64) |
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XEN Xen support is enabled |
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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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Finally, the [KMG] suffix is commonly described after a number of kernel parameter values. These 'K', 'M', and 'G' letters represent the _binary_ multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30 bytes respectively. Such letter suffixes can also be entirely omitted. |
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acpi= [HW,ACPI,X86] |
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Advanced Configuration and Power Interface |
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Format: { force | off | 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 |
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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/runtime_pm.txt, pci=noacpi |
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acpi_rsdp= [ACPI,EFI,KEXEC] Pass the RSDP address to the kernel, mostly used on machines running EFI runtime service to boot the second kernel for kdump. |
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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_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, 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). |
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nonvs prevents the kernel from saving/restoring the ACPI NVS memory during suspend/hibernation and resume. |
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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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add_efi_memmap [EFI; X86] Include EFI memory map in kernel's map of available physical RAM. |
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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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ALSA [HW,ALSA] See Documentation/sound/alsa/alsa-parameters.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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align_va_addr= [X86-64] Align virtual addresses by clearing slice [14:12] when allocating a VMA at process creation time. This option gives you up to 3% performance improvement on AMD F15h machines (where it is enabled by default) for a CPU-intensive style benchmark, and it can vary highly in a microbenchmark depending on workload and compiler. |
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32: only for 32-bit processes 64: only for 64-bit processes |
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on: enable for both 32- and 64-bit processes off: disable for both 32- and 64-bit processes |
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amd_iommu= [HW,X86-64] |
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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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force_isolation - Force device isolation for all devices. The IOMMU driver is not allowed anymore to lift isolation requirements as needed. This option does not override iommu=pt |
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amd_iommu_dump= [HW,X86-64] Enable AMD IOMMU driver option to dump the ACPI table for AMD IOMMU. With this option enabled, AMD IOMMU driver will print ACPI tables for AMD IOMMU during IOMMU initialization. |
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amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: <a>,<b> |
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See also Documentation/input/joystick.txt |
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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 |
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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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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 |
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bttv.tuner= |
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bulk_remove=off [PPC] This parameter disables the use of the pSeries firmware feature for flushing multiple hpte entries at a time. |
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c101= [NET] Moxa C101 synchronous serial card |
cd4f0ef7c doc/kernel-parame... |
409 |
cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. |
1da177e4c Linux-2.6.12-rc2 |
410 411 412 413 414 |
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. |
20510f2f4 security: Convert... |
415 416 417 418 419 |
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. |
14ff56bbb [S390] cio: Dump ... |
420 421 |
ccw_timeout_log [S390] See Documentation/s390/CommonIO for details. |
1da177e4c Linux-2.6.12-rc2 |
422 |
|
8bab8dded cgroups: add cgro... |
423 424 425 |
cgroup_disable= [KNL] Disable a particular controller Format: {name of the controller(s) to disable} {Currently supported controllers - "memory"} |
1da177e4c Linux-2.6.12-rc2 |
426 427 428 |
checkreqprot [SELINUX] Set initial checkreqprot flag value. Format: { "0" | "1" } See security/selinux/Kconfig help text. |
a99130449 [PATCH] kernel-pa... |
429 430 |
0 -- check protection applied by kernel (includes any implied execute protection). |
1da177e4c Linux-2.6.12-rc2 |
431 432 |
1 -- check protection requested by application. Default value is set via a kernel config option. |
a99130449 [PATCH] kernel-pa... |
433 434 |
Value can be changed at runtime via /selinux/checkreqprot. |
661ca0da3 [S390] Cleanup in... |
435 436 |
cio_ignore= [S390] See Documentation/s390/CommonIO for details. |
cd4f0ef7c doc/kernel-parame... |
437 |
clock= [BUGS=X86-32, HW] gettimeofday clocksource override. |
734efb467 [PATCH] Time: Clo... |
438 |
[Deprecated] |
3f6dee9b2 Fix some typos in... |
439 |
Forces specified clocksource (if available) to be used |
734efb467 [PATCH] Time: Clo... |
440 |
when calculating gettimeofday(). If specified |
3f6dee9b2 Fix some typos in... |
441 |
clocksource is not available, it defaults to PIT. |
1da177e4c Linux-2.6.12-rc2 |
442 |
Format: { pit | tsc | cyclone | pmtmr } |
592913ecb time: Kill off CO... |
443 |
clocksource= Override the default clocksource |
3d6ac9843 document clocksou... |
444 445 446 447 448 449 450 451 452 453 |
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 |
9863c90f6 x86, vmware: Remo... |
454 |
[X86-32] pit,hpet,tsc; |
3d6ac9843 document clocksou... |
455 456 457 458 459 460 461 |
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 ... |
462 463 |
clearcpuid=BITNUM [X86] Disable CPUID feature X for the kernel. See |
07983f0e3 documentation: up... |
464 465 |
arch/x86/include/asm/cpufeature.h for the valid bit numbers. Note the Linux specific bits are not necessarily |
ac72e7888 x86: add generic ... |
466 467 468 469 470 471 472 473 |
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. |
c64be2bb1 drivers: add Cont... |
474 475 476 477 |
cma=nn[MG] [ARM,KNL] Sets the size of kernel global memory area for contiguous memory allocations. For more information, see include/linux/dma-contiguous.h |
14f966e79 powerpc/pseries: ... |
478 479 480 481 482 483 |
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 |
c79095092 ARM: integrate CM... |
484 485 |
coherent_pool=nn[KMG] [ARM,KNL] Sets the size of memory pool for coherent, atomic dma |
e9da6e990 ARM: dma-mapping:... |
486 |
allocations, by default set to 256K. |
c79095092 ARM: integrate CM... |
487 |
|
6cececfce x86, documentatio... |
488 |
code_bytes [X86] How many bytes of object code to print |
a25bd9496 x86: add the "pri... |
489 |
in an oops report. |
86c418374 [PATCH] i386: add... |
490 491 |
Range: 0 - 8192 Default: 64 |
1da177e4c Linux-2.6.12-rc2 |
492 |
com20020= [HW,NET] ARCnet - COM20020 chipset |
a99130449 [PATCH] kernel-pa... |
493 494 |
Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
1da177e4c Linux-2.6.12-rc2 |
495 496 497 |
com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) Format: <io>[,<irq>] |
a99130449 [PATCH] kernel-pa... |
498 499 |
com90xx= [HW,NET] ARCnet - COM90xx chipset (memory-mapped buffers) |
1da177e4c Linux-2.6.12-rc2 |
500 501 502 503 |
Format: <io>[,<irq>[,<memstart>]] condev= [HW,S390] console device conmode= |
a99130449 [PATCH] kernel-pa... |
504 |
|
1da177e4c Linux-2.6.12-rc2 |
505 506 507 508 509 |
console= [KNL] Output console device and options. tty<n> Use the virtual console device <n>. ttyS<n>[,options] |
f1a1c2dc2 [PATCH] doc: more... |
510 |
ttyUSB0[,options] |
1da177e4c Linux-2.6.12-rc2 |
511 |
Use the specified serial port. The options are of |
f1a1c2dc2 [PATCH] doc: more... |
512 513 514 515 516 517 518 519 520 |
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 |
521 |
|
18a8bd949 serial: convert e... |
522 523 |
uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] |
1da177e4c Linux-2.6.12-rc2 |
524 525 526 527 |
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... |
528 529 530 531 |
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... |
532 533 534 |
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: ... |
535 536 537 538 |
coredump_filter= [KNL] Change the default value for /proc/<pid>/coredump_filter. See also Documentation/filesystems/proc.txt. |
62027aea2 cpuidle: create b... |
539 540 |
cpuidle.off=1 [CPU_IDLE] disable the cpuidle sub-system |
1da177e4c Linux-2.6.12-rc2 |
541 |
cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
a99130449 [PATCH] kernel-pa... |
542 543 |
Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
1da177e4c Linux-2.6.12-rc2 |
544 |
|
6f21e6463 Documentation: co... |
545 546 547 548 549 550 551 |
crashkernel=size[KMG][@offset[KMG]] [KNL] Using kexec, Linux can switch to a 'crash kernel' upon panic. This parameter reserves the physical memory region [offset, offset + size] for that kernel image. If '@offset' is omitted, then a suitable offset is selected automatically. Check Documentation/kdump/kdump.txt for further details. |
dc009d924 [PATCH] kexec: ad... |
552 |
|
fb391599f Add documentation... |
553 554 555 556 557 |
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 |
6f21e6463 Documentation: co... |
558 |
Documentation/kdump/kdump.txt for an example. |
fb391599f Add documentation... |
559 |
|
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 564 |
cs89x0_dma= [HW,NET] Format: <dma> cs89x0_media= [HW,NET] Format: { rj45 | aui | bnc } |
a99130449 [PATCH] kernel-pa... |
565 |
|
a99130449 [PATCH] kernel-pa... |
566 |
dasd= [HW,NET] |
1da177e4c Linux-2.6.12-rc2 |
567 568 569 570 571 572 |
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 |
a648ec05b Dynamic Debug: In... |
573 574 |
ddebug_query= [KNL,DYNAMIC_DEBUG] Enable debug messages at early boot time. See Documentation/dynamic-debug-howto.txt for |
29e36c9ff dynamic_debug: up... |
575 |
details. Deprecated, see dyndbg. |
a648ec05b Dynamic Debug: In... |
576 |
|
1da177e4c Linux-2.6.12-rc2 |
577 |
debug [KNL] Enable kernel debugging (events log level). |
cae2ed9aa [PATCH] lockdep: ... |
578 579 580 581 582 583 584 585 |
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... |
586 |
debug_objects [KNL] Enable object debugging |
3e8ebb5c4 debug_objects: ad... |
587 588 |
no_debug_objects [KNL] Disable object debugging |
c0a32fc5a mm: more intensiv... |
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 |
debug_guardpage_minorder= [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this parameter allows control of the order of pages that will be intentionally kept free (and hence protected) by the buddy allocator. Bigger value increase the probability of catching random memory corruption, but reduce the amount of memory for normal system use. The maximum possible value is MAX_ORDER/2. Setting this parameter to 1 or 2 should be enough to identify most random memory corruption problems caused by bugs in kernel or driver code when a CPU writes to (or reads from) a random memory location. Note that there exists a class of memory corruptions problems caused by buggy H/W or F/W or by drivers badly programing DMA (basically when memory is written at bus level and the CPU MMU is bypassed) which are not detectable by CONFIG_DEBUG_PAGEALLOC, hence this option will not help tracking down these problems. |
d3af01f18 Documentation: do... |
607 |
debugpat [X86] Enable PAT debugging |
2d27a9661 Documentation: "... |
608 |
decnet.addr= [HW,NET] |
1da177e4c Linux-2.6.12-rc2 |
609 610 |
Format: <area>[,<node>] See also Documentation/networking/decnet.txt. |
0cb55ad2a docs: alphabetize... |
611 612 613 614 615 616 617 |
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... |
618 |
|
1da177e4c Linux-2.6.12-rc2 |
619 620 |
dhash_entries= [KNL] Set number of hash buckets for dentry cache. |
a99130449 [PATCH] kernel-pa... |
621 |
|
1da177e4c Linux-2.6.12-rc2 |
622 623 624 625 626 |
digi= [HW,SERIAL] IO parameters + enable/disable command. digiepca= [HW,SERIAL] See drivers/char/README.epca and |
31c00fc15 Create/use more d... |
627 |
Documentation/serial/digiepca.txt. |
1da177e4c Linux-2.6.12-rc2 |
628 |
|
b0f83b280 doc: document IPv... |
629 630 |
disable= [IPV6] See Documentation/networking/ipv6.txt. |
4e8b0cf46 powerpc/pseries: ... |
631 632 633 |
disable_ddw [PPC/PSERIES] Disable Dynamic DMA Window support. Use this if to workaround buggy firmware. |
b0f83b280 doc: document IPv... |
634 635 |
disable_ipv6= [IPV6] See Documentation/networking/ipv6.txt. |
95ffa2438 x86: mtrr cleanup... |
636 |
disable_mtrr_cleanup [X86] |
95ffa2438 x86: mtrr cleanup... |
637 638 |
The kernel tries to adjust MTRR layout from continuous to discrete, to make X server driver able to add WB |
0cb55ad2a docs: alphabetize... |
639 |
entry later. This parameter disables that. |
95ffa2438 x86: mtrr cleanup... |
640 |
|
093af8d7f x86_32: trim memo... |
641 |
disable_mtrr_trim [X86, Intel and AMD only] |
99fc8d424 x86, 32-bit: trim... |
642 643 644 645 |
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... |
646 |
disable_timer_pin_1 [X86] |
0cb55ad2a docs: alphabetize... |
647 648 |
Disable PIN 1 of APIC timer Can be useful to work around chipset bugs. |
0cb55ad2a docs: alphabetize... |
649 650 651 652 653 654 655 656 657 |
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... |
658 659 660 661 662 663 |
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. |
da0df92b5 drm: allow loadin... |
664 665 666 667 668 669 670 671 672 673 674 675 676 677 |
drm_kms_helper.edid_firmware=[<connector>:]<file> Broken monitors, graphic adapters and KVMs may send no or incorrect EDID data sets. This parameter allows to specify an EDID data set in the /lib/firmware directory that is used instead. Generic built-in EDID data sets are used, if one of edid/1024x768.bin, edid/1280x1024.bin, edid/1680x1050.bin, or edid/1920x1080.bin is given and no file with the same name exists. Details and instructions how to build your own EDID data are available in Documentation/EDID/HOWTO.txt. An EDID data set will only be used for a particular connector, if its name and a colon are prepended to the EDID name. |
1da177e4c Linux-2.6.12-rc2 |
678 |
dscc4.setup= [NET] |
29e36c9ff dynamic_debug: up... |
679 680 681 682 |
dyndbg[="val"] [KNL,DYNAMIC_DEBUG] module.dyndbg[="val"] Enable debug messages at boot time. See Documentation/dynamic-debug-howto.txt for details. |
0cb55ad2a docs: alphabetize... |
683 684 685 |
earlycon= [KNL] Output early console device and options. uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] |
1917ac76e serial: MMIO32 su... |
686 |
uart[8250],mmio32,<addr>[,options] |
0cb55ad2a docs: alphabetize... |
687 688 |
Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address. |
162902466 Documentation: ke... |
689 690 |
MMIO inter-register address stride is either 8-bit (mmio) or 32-bit (mmio32). |
0cb55ad2a docs: alphabetize... |
691 |
The options are the same as for ttyS, above. |
6cececfce x86, documentatio... |
692 |
earlyprintk= [X86,SH,BLACKFIN] |
1da177e4c Linux-2.6.12-rc2 |
693 694 |
earlyprintk=vga earlyprintk=serial[,ttySn[,baudrate]] |
ea3acb199 x86: earlyprintk:... |
695 |
earlyprintk=ttySn[,baudrate] |
9780bc41d USB: ehci-dbgp,do... |
696 |
earlyprintk=dbgp[debugController#] |
1da177e4c Linux-2.6.12-rc2 |
697 |
|
a99130449 [PATCH] kernel-pa... |
698 |
Append ",keep" to not disable it when the real console |
1da177e4c Linux-2.6.12-rc2 |
699 |
takes over. |
5c05917e7 x86: usb debug po... |
700 |
Only vga or serial or usb debug port at a time. |
1da177e4c Linux-2.6.12-rc2 |
701 702 703 704 705 706 707 708 |
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... |
709 710 |
ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc=kbd |
25985edce Fix common misspe... |
711 |
This is designed to be used in conjunction with |
9731191f7 kgdboc: Add ekgdb... |
712 |
the boot argument: earlyprintk=vga |
1da177e4c Linux-2.6.12-rc2 |
713 |
edd= [EDD] |
8c4dd6068 edd: add default ... |
714 |
Format: {"off" | "on" | "skip[mbr]"} |
1da177e4c Linux-2.6.12-rc2 |
715 |
|
1da177e4c Linux-2.6.12-rc2 |
716 717 |
eisa_irq_edge= [PARISC,HW] See header of drivers/parisc/eisa.c. |
cd4f0ef7c doc/kernel-parame... |
718 |
elanfreq= [X86-32] |
1da177e4c Linux-2.6.12-rc2 |
719 |
See comment before function elanfreq_setup() in |
71f77055d Doc*/kernel-param... |
720 |
arch/x86/kernel/cpu/cpufreq/elanfreq.c. |
1da177e4c Linux-2.6.12-rc2 |
721 722 |
elevator= [IOSCHED] |
17a9e7bba Documentation: re... |
723 |
Format: {"cfq" | "deadline" | "noop"} |
395cf9691 doc: fix broken r... |
724 |
See Documentation/block/cfq-iosched.txt and |
a99130449 [PATCH] kernel-pa... |
725 |
Documentation/block/deadline-iosched.txt for details. |
d3bf37955 [S390] kdump: Add... |
726 |
elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390] |
a99130449 [PATCH] kernel-pa... |
727 |
Specifies physical address of start of kernel core |
d3bf37955 [S390] kdump: Add... |
728 729 |
image elf header and optionally the size. Generally kexec loader will pass this option to capture kernel. |
aac04b32f [PATCH] kdump: x8... |
730 |
See Documentation/kdump/kdump.txt for details. |
1da177e4c Linux-2.6.12-rc2 |
731 |
|
0cb55ad2a docs: alphabetize... |
732 733 734 735 |
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... |
736 |
enable_timer_pin_1 [X86] |
0cb55ad2a docs: alphabetize... |
737 738 739 740 |
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 |
741 742 743 744 745 746 747 |
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. |
a08f82d08 ACPI, APEI, Error... |
748 749 750 |
erst_disable [ACPI] Disable Error Record Serialization Table (ERST) support. |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 |
ether= [HW,NET] Ethernet cards parameters This option is obsoleted by the "netdev=" option, which has equivalent usage. See its documentation for details. |
7102ebcd6 evm: permit only ... |
754 755 756 757 |
evm= [EVM] Format: { "fix" } Permit 'security.evm' to be updated regardless of current integrity status. |
de1ba09b2 [PATCH] fault inj... |
758 759 760 761 762 |
failslab= fail_page_alloc= fail_make_request=[KNL] General fault injection mechanism. Format: <interval>,<probability>,<space>,<times> |
395cf9691 doc: fix broken r... |
763 |
See also Documentation/fault-injection/. |
de1ba09b2 [PATCH] fault inj... |
764 |
|
1da177e4c Linux-2.6.12-rc2 |
765 |
floppy= [HW] |
31c00fc15 Create/use more d... |
766 |
See Documentation/blockdev/floppy.txt. |
1da177e4c Linux-2.6.12-rc2 |
767 |
|
f13ae30e1 [IA64] allow user... |
768 769 770 771 772 |
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... |
773 |
ftrace=[tracer] |
2af15d6a4 ftrace: add kerne... |
774 |
[FTRACE] will set and start the specified tracer |
d9e540762 ftrace: ftrace_du... |
775 776 |
as early as possible in order to facilitate early boot debugging. |
cecbca96d tracing: Dump eit... |
777 |
ftrace_dump_on_oops[=orig_cpu] |
2af15d6a4 ftrace: add kerne... |
778 |
[FTRACE] will dump the trace buffers on oops. |
cecbca96d tracing: Dump eit... |
779 780 781 782 |
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... |
783 784 785 786 787 788 |
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 |
162902466 Documentation: ke... |
789 |
tracing directory. |
2af15d6a4 ftrace: add kerne... |
790 791 792 793 794 795 |
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... |
796 |
|
369bc18f9 ftrace: add kerne... |
797 798 799 800 801 802 |
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 |
803 804 805 806 807 808 809 |
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 ... |
810 811 812 |
gart_fix_e820= [X86_64] disable the fix e820 for K8 GART Format: off | on default: on |
2521f2c22 gcov: add gcov pr... |
813 814 815 816 817 |
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 |
818 819 |
gpt [EFI] Forces disk with valid GPT signature but invalid Protective MBR to be treated as GPT. |
1da177e4c Linux-2.6.12-rc2 |
820 821 |
hashdist= [KNL,NUMA] Large hashes allocated during boot are distributed across NUMA nodes. Defaults on |
162902466 Documentation: ke... |
822 |
for 64-bit NUMA, off otherwise. |
a99130449 [PATCH] kernel-pa... |
823 |
Format: 0 | 1 (for off | on) |
1da177e4c Linux-2.6.12-rc2 |
824 825 826 827 828 |
hcl= [IA-64] SGI's Hardware Graph compatibility layer hd= [EIDE] (E)IDE hard drive subsystem geometry Format: <cyl>,<head>,<sect> |
ea8c071ca ACPI, APEI, Docum... |
829 830 831 832 |
hest_disable [ACPI] Disable Hardware Error Source Table (HEST) support; corresponding firmware-first mode error processing logic will be disabled. |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 836 |
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:... |
837 838 839 |
highres= [KNL] Enable/disable high resolution timer mode. Valid parameters: "on", "off" Default: "on" |
1da177e4c Linux-2.6.12-rc2 |
840 841 |
hisax= [HW,ISDN] See Documentation/isdn/README.HiSax. |
0cb55ad2a docs: alphabetize... |
842 843 844 845 846 847 848 849 850 |
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... |
851 852 |
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 ... |
853 854 855 856 857 |
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... |
858 859 |
Note that 1GB pages can only be allocated at boot time using hugepages= and not freed afterwards. |
6902aa84f doc: Add remainin... |
860 |
|
555d61d65 [S390] update doc... |
861 862 |
hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC) terminal devices. Valid values: 0..8 |
431429ff7 [S390] hvc_iucv: ... |
863 864 865 |
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... |
866 |
|
7bf693951 console: allow to... |
867 868 869 870 871 |
keep_bootcon [KNL] Do not unregister boot console at start. This is only useful for debugging when something happens in the window between unregistering the boot console and initializing the real console. |
3a853fb93 ARM: OMAP: Add co... |
872 |
i2c_bus= [HW] Override the default board specific I2C bus speed |
7954763bb ARM: OMAP: Add me... |
873 874 |
or register an additional I2C bus that is not registered from board initialization code. |
3a853fb93 ARM: OMAP: Add co... |
875 876 |
Format: <bus_id>,<clkrate> |
36d957392 Input: document i... |
877 |
i8042.debug [HW] Toggle i8042 debug mode |
1da177e4c Linux-2.6.12-rc2 |
878 |
i8042.direct [HW] Put keyboard port into non-translated mode |
84eb8d060 Fix "can not" in ... |
879 880 |
i8042.dumbkbd [HW] Pretend that controller can only read data from keyboard and cannot control its state |
1da177e4c Linux-2.6.12-rc2 |
881 882 |
(Don't attempt to blink the leds) i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
945ef0d42 Input: i8042 - ad... |
883 |
i8042.nokbd [HW] Don't check/create keyboard port |
75d08c789 Input: document i... |
884 885 |
i8042.noloop [HW] Disable the AUX Loopback command while probing for the AUX port |
1da177e4c Linux-2.6.12-rc2 |
886 887 888 889 |
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 |
24775d652 Documentation: Fi... |
890 |
i8042.notimeout [HW] Ignore timeout condition signalled by controller |
1da177e4c Linux-2.6.12-rc2 |
891 892 893 894 |
i8042.reset [HW] Reset the controller during init and cleanup i8042.unlock [HW] Unlock (ignore) the keylock i810= [HW,DRM] |
e70c9d5e6 [PATCH] I8K: use ... |
895 896 897 |
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 |
898 899 900 901 902 903 904 |
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. |
4dca20efb drm/i915: panel: ... |
905 |
i915.invert_brightness= |
7bd90909b drm/i915: panel: ... |
906 907 |
[DRM] Invert the sense of the variable that is used to set the brightness of the panel backlight. Normally a |
4dca20efb drm/i915: panel: ... |
908 909 910 911 912 913 914 915 916 917 |
brightness value of 0 indicates backlight switched off, and the maximum of the brightness value sets the backlight to maximum brightness. If this parameter is set to 0 (default) and the machine requires it, or this parameter is set to 1, a brightness value of 0 sets the backlight to maximum brightness, and the maximum of the brightness value switches the backlight off. -1 -- never invert brightness 0 -- machine default 1 -- force brightness inversion |
7bd90909b drm/i915: panel: ... |
918 |
|
1da177e4c Linux-2.6.12-rc2 |
919 920 |
icn= [HW,ISDN] Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
0af80c04e ide: ide.c 'clear... |
921 922 |
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... |
923 924 |
.vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr .cdrom .chs .ignore_cable are additional options |
1c10e9382 ide: update refer... |
925 |
See Documentation/ide/ide.txt. |
1da177e4c Linux-2.6.12-rc2 |
926 |
|
0cb55ad2a docs: alphabetize... |
927 928 |
ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem Claim all unknown PCI IDE storage controllers. |
f039b7547 [PATCH] x86: Don'... |
929 |
idle= [X86] |
ada9cfdd1 doc: fix kernel-p... |
930 931 932 933 934 935 936 937 938 939 940 |
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... |
941 |
In such case C2/C3 won't be used again. |
ada9cfdd1 doc: fix kernel-p... |
942 |
idle=nomwait: Disable mwait for CPU C-states |
a99130449 [PATCH] kernel-pa... |
943 |
|
792908225 [PATCH] add ignor... |
944 945 946 |
ignore_loglevel [KNL] Ignore loglevel setting - this will print /all/ kernel messages to the console. Useful for debugging. |
0eca6b7c7 printk: add modul... |
947 948 949 |
We also add it as printk module parameter, so users could change it dynamically, usually by /sys/module/printk/parameters/ignore_loglevel. |
792908225 [PATCH] add ignor... |
950 |
|
1da177e4c Linux-2.6.12-rc2 |
951 952 |
ihash_entries= [KNL] Set number of hash buckets for inode cache. |
3323eec92 integrity: IMA as... |
953 954 955 956 957 958 |
ima_audit= [IMA] Format: { "0" | "1" } 0 -- integrity auditing messages. (Default) 1 -- enable informational integrity auditing messages. ima_hash= [IMA] |
a9ed83a58 trivial: typo in ... |
959 |
Format: { "sha1" | "md5" } |
3323eec92 integrity: IMA as... |
960 |
default: "sha1" |
5789ba3bd IMA: Minimal IMA ... |
961 962 963 964 965 |
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 |
966 967 968 969 970 971 972 973 974 975 976 977 978 |
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... |
979 |
intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option |
0cd5c3c80 x86: disable inte... |
980 981 |
on Enable intel iommu driver. |
ba3959276 Intel IOMMU: Inte... |
982 983 984 985 986 987 988 989 |
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... |
990 991 |
forcedac [x86_64] With this option iommu will not optimize to look |
162902466 Documentation: ke... |
992 |
for io virtual address below 32-bit forcing dual |
7d3b03ce7 Intel IOMMU: Inte... |
993 |
address cycle on pci bus for cards supporting greater |
162902466 Documentation: ke... |
994 995 |
than 32-bit addressing. The default is to look for translation below 32-bit and if not available |
7d3b03ce7 Intel IOMMU: Inte... |
996 |
then look in the higher range. |
5e0d2a6fc PCI: iommu: iotlb... |
997 998 999 1000 |
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. |
6dd9a7c73 intel-iommu: Enab... |
1001 1002 1003 1004 |
sp_off [Default Off] By default, super page will be supported if Intel IOMMU has the capability. With this option, super page will not be supported. |
2e92c7ad8 ACPI: kernel-para... |
1005 1006 1007 1008 |
intel_idle.max_cstate= [KNL,HW,ACPI,X86] 0 disables intel_idle and fall back on acpi_idle. 1 to 6 specify maximum depth of C-state. |
d1423d567 intr-remap: allow... |
1009 |
intremap= [X86-64, Intel-IOMMU] |
d1423d567 intr-remap: allow... |
1010 1011 1012 |
on enable Interrupt Remapping (default) off disable Interrupt Remapping nosid disable Source ID checking |
41750d31f x86, x2apic: Enab... |
1013 1014 |
no_x2apic_optout BIOS x2APIC opt-out request will be ignored |
d1423d567 intr-remap: allow... |
1015 |
|
0cb55ad2a docs: alphabetize... |
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
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 |
bcb71abe7 iommu: Add option... |
1031 |
pt [x86, IA-64] |
bcb71abe7 iommu: Add option... |
1032 |
|
0cb55ad2a docs: alphabetize... |
1033 1034 1035 1036 |
io7= [HW] IO7 for Marvel based alpha systems See comment before marvel_specify_io7 in arch/alpha/kernel/core_marvel.c. |
6cececfce x86, documentatio... |
1037 |
io_delay= [X86] I/O delay method |
6e7c40259 x86: various chan... |
1038 1039 1040 1041 |
0x80 Standard port 0x80 based delay 0xed Alternate port 0xed based delay (needed on some systems) |
b02aae9cf x86: provide a DM... |
1042 |
udelay |
6e7c40259 x86: various chan... |
1043 1044 1045 |
Simple two microseconds delay none No delay |
b02aae9cf x86: provide a DM... |
1046 |
|
1da177e4c Linux-2.6.12-rc2 |
1047 |
ip= [IP_PNP] |
dc7a08166 nfs: new subdir D... |
1048 |
See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4c Linux-2.6.12-rc2 |
1049 1050 |
ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
c8facbb62 various doc/kerne... |
1051 1052 |
See comment before ip2_setup() in drivers/char/ip2/ip2base.c. |
1da177e4c Linux-2.6.12-rc2 |
1053 |
|
200803dfe [PATCH] irqpoll |
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 |
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 |
1064 |
isapnp= [ISAPNP] |
a99130449 [PATCH] kernel-pa... |
1065 |
Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
1da177e4c Linux-2.6.12-rc2 |
1066 1067 |
isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
22f2e2801 [PATCH] get_optio... |
1068 1069 1070 |
Format: <cpu number>,...,<cpu number> or |
b225d44e2 Documentation/ker... |
1071 1072 |
<cpu number>-<cpu number> (must be a positive range in ascending order) |
22f2e2801 [PATCH] get_optio... |
1073 1074 |
or a mixture <cpu number>,...,<cpu number>-<cpu number> |
b225d44e2 Documentation/ker... |
1075 |
|
1da177e4c Linux-2.6.12-rc2 |
1076 1077 |
This option can be used to specify one or more CPUs to isolate from the general SMP balancing and scheduling |
b225d44e2 Documentation/ker... |
1078 1079 |
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 |
1080 1081 1082 1083 |
<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... |
1084 1085 1086 |
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 |
1087 |
|
a99130449 [PATCH] kernel-pa... |
1088 |
iucv= [HW,NET] |
1da177e4c Linux-2.6.12-rc2 |
1089 1090 1091 |
js= [HW,JOY] Analog joystick See Documentation/input/joystick.txt. |
0cb55ad2a docs: alphabetize... |
1092 |
keepinitrd [HW,ARM] |
6cececfce x86, documentatio... |
1093 |
kernelcore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
ed7ed3651 handle kernelcore... |
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 |
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... |
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 |
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... |
1118 |
kgdboc= [KGDB,HW] kgdb over consoles. |
ada64e4c9 kgdboc,keyboard: ... |
1119 1120 |
Requires a tty driver that supports console polling, or a supported polling keyboard driver (non-usb). |
65b5ac147 kgdb,docs: Update... |
1121 1122 1123 1124 1125 1126 |
Serial only format: <serial_device>[,baud] keyboard only format: kbd keyboard and serial format: kbd,<serial_device>[,baud] Optional Kernel mode setting: kms, kbd format: kms,kbd kms, kbd and serial format: kms,kbd,<ser_dev>[,baud] |
6cdf6e06d kgdb: document pa... |
1127 |
|
84c08fd61 kgdb,docs: Update... |
1128 1129 |
kgdbwait [KGDB] Stop kernel execution and enter the kernel debugger at the earliest opportunity. |
9bed90c6a Documentation: Do... |
1130 1131 1132 |
kmac= [MIPS] korina ethernet MAC address. Configure the RouterBoard 532 series on-chip Ethernet adapter MAC address. |
04f70336c kmemleak: Add doc... |
1133 1134 1135 |
kmemleak= [KNL] Boot-time kmemleak enable/disable Valid arguments: on, off Default: on |
6cececfce x86, documentatio... |
1136 |
kstack=N [X86] Print N words from the kernel stack |
0cb55ad2a docs: alphabetize... |
1137 |
in oops dumps. |
fef07aae9 KVM: add module p... |
1138 1139 |
kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs. Default is 0 (don't ignore, but inject #GP) |
a182d8737 KVM: document 'kv... |
1140 1141 |
kvm.mmu_audit= [KVM] This is a R/W parameter which allows audit KVM MMU at runtime. |
fef07aae9 KVM: add module p... |
1142 |
Default is 0 (off) |
fef07aae9 KVM: add module p... |
1143 |
kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM. |
8475f94ab KVM: fix the desc... |
1144 |
Default is 1 (enabled) |
fef07aae9 KVM: add module p... |
1145 1146 1147 |
kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU) for all guests. |
162902466 Documentation: ke... |
1148 |
Default is 1 (enabled) if in 64-bit or 32-bit PAE mode. |
fef07aae9 KVM: add module p... |
1149 |
|
fef07aae9 KVM: add module p... |
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 |
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) |
e1a72ae28 KVM: nVMX: Docume... |
1161 1162 1163 |
kvm-intel.nested= [KVM,Intel] Enable VMX nesting (nVMX). Default is 0 (disabled) |
fef07aae9 KVM: add module p... |
1164 1165 1166 1167 1168 1169 1170 1171 |
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 |
1172 |
l2cr= [PPC] |
a78bfbfcf [POWERPC] Add ker... |
1173 |
l3cr= [PPC] |
cd4f0ef7c doc/kernel-parame... |
1174 |
lapic [X86-32,APIC] Enable the local APIC even if BIOS |
a99130449 [PATCH] kernel-pa... |
1175 |
disabled it. |
1da177e4c Linux-2.6.12-rc2 |
1176 |
|
6cececfce x86, documentatio... |
1177 |
lapic_timer_c2_ok [X86,APIC] trust the local apic timer |
ada9cfdd1 doc: fix kernel-p... |
1178 |
in C2 power state. |
e585bef81 [PATCH] i386: add... |
1179 |
|
fcb71f6f0 Update kernel par... |
1180 1181 1182 1183 |
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 |
162902466 Documentation: ke... |
1184 |
libata.dma=4 Compact Flash DMA only |
fcb71f6f0 Update kernel par... |
1185 1186 |
Combinations also work, so libata.dma=3 enables DMA for disks and CDROMs, but not CFs. |
162902466 Documentation: ke... |
1187 |
|
203088715 Documentation/ker... |
1188 1189 1190 |
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... |
1191 |
|
78e70c237 libata: correct k... |
1192 1193 1194 |
libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume when set. Format: <int> |
332673257 libata: implement... |
1195 1196 |
libata.force= [LIBATA] Force configurations. The format is comma separated list of "[ID:]VAL" where ID is |
4c44f309c libata: fix docs,... |
1197 |
PORT[.DEVICE]. PORT and DEVICE are decimal numbers |
332673257 libata: implement... |
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 |
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... |
1226 1227 |
* nohrst, nosrst, norst: suppress hard, soft and both resets. |
43c9c5918 libata: implement... |
1228 |
* dump_id: dump IDENTIFY data. |
332673257 libata: implement... |
1229 1230 |
If there are multiple matching configurations changing the same attribute, the last one is used. |
95f72d1ed lmb: rename to me... |
1231 |
memblock=debug [KNL] Enable memblock debug messages. |
7c4be253d docs: add more ea... |
1232 |
|
1da177e4c Linux-2.6.12-rc2 |
1233 |
load_ramdisk= [RAM] List of ramdisks to load from floppy |
31c00fc15 Create/use more d... |
1234 |
See Documentation/blockdev/ramdisk.txt. |
1da177e4c Linux-2.6.12-rc2 |
1235 |
|
a6b25b675 [PATCH] nlm kerne... |
1236 1237 |
lockd.nlm_grace_period=P [NFS] Assign grace period. Format: <integer> |
1da177e4c Linux-2.6.12-rc2 |
1238 |
|
a6b25b675 [PATCH] nlm kerne... |
1239 1240 1241 1242 1243 1244 1245 1246 |
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 |
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 |
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 |
c756d08a0 Documentation: lo... |
1264 1265 1266 |
log_buf_len=n[KMG] Sets the size of the printk ring buffer, in bytes. n must be a power of two. The default size is set in the kernel config file. |
1da177e4c Linux-2.6.12-rc2 |
1267 |
|
accaa24c4 fbcon: logo: disa... |
1268 1269 1270 1271 |
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 |
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 |
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> |
162902466 Documentation: ke... |
1305 |
machvec= [IA-64] Force the use of a particular machine-vector |
a99130449 [PATCH] kernel-pa... |
1306 1307 |
(machvec) in a generic kernel. Example: machvec=hpzx1_swiotlb |
1da177e4c Linux-2.6.12-rc2 |
1308 |
|
3209e70e5 MIPS: Loongson: A... |
1309 1310 1311 |
machtype= [Loongson] Share the same kernel image file between different yeeloong laptop. Example: machtype=lemote-yeeloong-2f-7inch |
0cb55ad2a docs: alphabetize... |
1312 1313 |
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 |
1314 1315 |
maxcpus= [SMP] Maximum number of processors that an SMP kernel |
61ec7567d ACPI: boot correc... |
1316 1317 1318 1319 |
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 |
1320 |
|
d134b00b9 loop: add BLK_DEV... |
1321 1322 1323 1324 1325 1326 |
max_loop= [LOOP] The number of loop block devices that get (loop.max_loop) unconditionally pre-created at init time. The default number is configured by BLK_DEV_LOOP_MIN_COUNT. Instead of statically allocating a predefined number, loop devices can be requested on-demand with the /dev/loop-control interface. |
2b2c37503 [PATCH] Documenta... |
1327 |
|
cd4f0ef7c doc/kernel-parame... |
1328 |
mce [X86-32] Machine Check Exception |
1da177e4c Linux-2.6.12-rc2 |
1329 |
|
71cced6eb doc/x86: fix doc ... |
1330 |
mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt |
909dd324f x86: clean up mce... |
1331 |
|
1da177e4c Linux-2.6.12-rc2 |
1332 1333 |
md= [HW] RAID subsystems devices and level See Documentation/md.txt. |
a99130449 [PATCH] kernel-pa... |
1334 |
|
1da177e4c Linux-2.6.12-rc2 |
1335 1336 1337 |
mdacon= [MDA] Format: <first>,<last> Specifies range of consoles to be captured by the MDA. |
a99130449 [PATCH] kernel-pa... |
1338 |
|
1da177e4c Linux-2.6.12-rc2 |
1339 1340 1341 |
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... |
1342 |
[X86-32] Use together with memmap= to avoid physical |
1da177e4c Linux-2.6.12-rc2 |
1343 1344 |
address space collisions. Without memmap= PCI devices could be placed at addresses belonging to unused RAM. |
cd4f0ef7c doc/kernel-parame... |
1345 |
mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel |
1da177e4c Linux-2.6.12-rc2 |
1346 |
memory. |
6902aa84f doc: Add remainin... |
1347 1348 1349 |
memchunk=nn[KMG] [KNL,SH] Allow user to override the default size for per-device physically contiguous DMA buffers. |
6cececfce x86, documentatio... |
1350 |
memmap=exactmap [KNL,X86] Enable setting of an exact |
1da177e4c Linux-2.6.12-rc2 |
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 |
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... |
1367 1368 1369 1370 |
Example: Exclude memory from 0x18690000-0x1869ffff memmap=64K$0x18690000 or memmap=0x10000$0x18690000 |
1da177e4c Linux-2.6.12-rc2 |
1371 |
|
9f077871c x86: clean up mem... |
1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 |
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... |
1394 |
memtest= [KNL,X86] Enable memtest |
c64df7079 x86: memtest boot... |
1395 |
Format: <integer> |
c64df7079 x86: memtest boot... |
1396 |
default : 0 <disable> |
9e5f6cf5f x86: update descr... |
1397 1398 1399 1400 1401 1402 |
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... |
1403 |
|
1da177e4c Linux-2.6.12-rc2 |
1404 1405 |
meye.*= [HW] Set MotionEye Camera parameters See Documentation/video4linux/meye.txt. |
8f36881b3 x86: Geode MFGPT ... |
1406 1407 1408 |
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... |
1409 1410 1411 1412 |
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 |
1413 |
mga= [HW,DRM] |
1c207f952 Documentation/ker... |
1414 1415 |
min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this physical address is ignored. |
39f45d7bc [ARM] MINI2440: D... |
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 |
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... |
1436 1437 1438 1439 1440 1441 1442 |
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 |
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 |
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... |
1453 |
movablecore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
0cb55ad2a docs: alphabetize... |
1454 1455 1456 1457 1458 1459 1460 1461 |
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 |
1462 1463 |
MTD_Partition= [MTD] Format: <name>,<region-number>,<size>,<offset> |
a99130449 [PATCH] kernel-pa... |
1464 1465 |
MTD_Region= [MTD] Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
1da177e4c Linux-2.6.12-rc2 |
1466 1467 |
mtdparts= [MTD] |
c8facbb62 various doc/kerne... |
1468 |
See drivers/mtd/cmdlinepart.c. |
1da177e4c Linux-2.6.12-rc2 |
1469 |
|
4e89a2d8e powerpc/pseries: ... |
1470 1471 1472 |
multitce=off [PPC] This parameter disables the use of the pSeries firmware feature for updating multiple TCE entries at a time. |
5988af231 mtd: Flex-OneNAND... |
1473 1474 1475 1476 1477 1478 1479 1480 1481 |
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... |
1482 1483 1484 1485 |
mtdset= [ARM] ARM/S3C2412 JIVE boot control See arch/arm/mach-s3c2412/mach-jive.c |
1da177e4c Linux-2.6.12-rc2 |
1486 |
mtouchusb.raw_coordinates= |
a99130449 [PATCH] kernel-pa... |
1487 1488 |
[HW] Make the MicroTouch USB driver use raw coordinates ('y', default) or cooked coordinates ('n') |
1da177e4c Linux-2.6.12-rc2 |
1489 |
|
0cb55ad2a docs: alphabetize... |
1490 |
mtrr_chunk_size=nn[KMG] [X86] |
19f594600 trivial: Miscella... |
1491 |
used for mtrr cleanup. It is largest continuous chunk |
0cb55ad2a docs: alphabetize... |
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 |
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 |
1506 |
n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
1da177e4c Linux-2.6.12-rc2 |
1507 1508 1509 1510 |
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... |
1511 1512 |
This usage is only documented in each driver source file if at all. |
584015727 netfilter: accoun... |
1513 1514 1515 1516 |
nf_conntrack.acct= [NETFILTER] Enable connection tracking flow accounting 0 to disable accounting 1 to enable accounting |
d70a011db netfilter: comple... |
1517 |
Default value is 0. |
584015727 netfilter: accoun... |
1518 |
|
306a07536 NFS: Allow NFSROO... |
1519 |
nfsaddrs= [NFS] Deprecated. Use ip= instead. |
dc7a08166 nfs: new subdir D... |
1520 |
See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4c Linux-2.6.12-rc2 |
1521 1522 |
nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
dc7a08166 nfs: new subdir D... |
1523 |
See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4c Linux-2.6.12-rc2 |
1524 |
|
306a07536 NFS: Allow NFSROO... |
1525 1526 |
nfsrootdebug [NFS] enable nfsroot debugging messages. See Documentation/filesystems/nfs/nfsroot.txt. |
a72b44222 NFSv4: Allow user... |
1527 1528 1529 |
nfs.callback_tcpport= [NFS] set the TCP port on which the NFSv4 callback channel should listen. |
e571cbf1a NFS: Add a dns re... |
1530 1531 1532 1533 1534 1535 1536 |
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... |
1537 1538 1539 |
nfs.idmap_cache_timeout= [NFS] set the maximum lifetime for idmapper cache entries. |
f43bf0beb NFS: Add a boot p... |
1540 1541 1542 1543 1544 1545 |
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. |
ef159e917 NFSv4.1: Add a mo... |
1546 1547 1548 1549 1550 1551 1552 |
nfs.max_session_slots= [NFSv4.1] Sets the maximum number of session slots the client will attempt to negotiate with the server. This limits the number of simultaneous RPC requests that the client can send to the NFSv4.1 server. Note that there is little point in setting this value higher than the max_tcp_slot_table_limit. |
b064eca2c NFSv4: Send unmap... |
1553 |
nfs.nfs4_disable_idmapping= |
074b1d12f NFSv4: Change the... |
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 |
[NFSv4] When set to the default of '1', this option ensures that both the RPC level authentication scheme and the NFS level operations agree to use numeric uids/gids if the mount is using the 'sec=sys' security flavour. In effect it is disabling idmapping, which can make migration from legacy NFSv2/v3 systems to NFSv4 easier. Servers that do not support this mode of operation will be autodetected by the client, and it will fall back to using the idmapper. To turn off this behaviour, set the value to '0'. |
b064eca2c NFSv4: Send unmap... |
1565 |
|
db8ac8ba8 NFSv4: Send imple... |
1566 1567 1568 1569 1570 1571 1572 |
nfs.send_implementation_id = [NFSv4.1] Send client implementation identification information in exchange_id requests. If zero, no implementation identification information will be sent. The default is to send the implementation identification information. |
e9541ce8e nfsd4: allow nume... |
1573 1574 1575 1576 1577 1578 |
nfsd.nfs4_disable_idmapping= [NFSv4] When set to the default of '1', the NFSv4 server will return only numeric uids and gids to clients using auth_sys, and will accept numeric uids and gids from such clients. This is intended to ease migration from NFSv2/v3. |
db8ac8ba8 NFSv4: Send imple... |
1579 |
|
18d98f6c0 pnfs-obj: autolog... |
1580 1581 1582 1583 1584 |
objlayoutdriver.osd_login_prog= [NFS] [OBJLAYOUT] sets the pathname to the program which is used to automatically discover and login into new osd-targets. Please see: Documentation/filesystems/pnfs.txt for more explanations |
1e1030dcc sh: nmi_debug sup... |
1585 |
nmi_debug= [KNL,AVR32,SH] Specify one or more actions to take |
e7ba176b4 [AVR32] NMI debug... |
1586 1587 |
when a NMI is triggered. Format: [state][,regs][,debounce][,die] |
6cececfce x86, documentatio... |
1588 |
nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels |
fef2c9bc1 kernel/watchdog.c... |
1589 |
Format: [panic,][nopanic,][num] |
5dc305587 x86, NMI: Add bac... |
1590 |
Valid num: 0 |
5b9a0e14e x86: nmi - nmi_wa... |
1591 |
0 - turn nmi_watchdog off |
0cb55ad2a docs: alphabetize... |
1592 |
When panic is specified, panic when an NMI watchdog |
fef2c9bc1 kernel/watchdog.c... |
1593 1594 |
timeout occurs (or 'nopanic' to override the opposite default). |
0cb55ad2a docs: alphabetize... |
1595 1596 |
This is useful when you use a panic=... timeout and need the box quickly up again. |
1da177e4c Linux-2.6.12-rc2 |
1597 |
|
bff38771e netpoll: Introduc... |
1598 1599 1600 1601 |
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... |
1602 |
no387 [BUGS=X86-32] Tells the kernel to use the 387 maths |
1da177e4c Linux-2.6.12-rc2 |
1603 1604 |
emulation library even if a 387 maths coprocessor is present. |
0cb55ad2a docs: alphabetize... |
1605 1606 1607 1608 1609 1610 1611 1612 1613 |
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. |
134620f7a printk: add conso... |
1614 1615 1616 1617 1618 |
To facilitate more flexible debugging, we also add console_suspend, a printk module parameter to control it. Users could use console_suspend (usually /sys/module/printk/parameters/console_suspend) to turn on/off it dynamically. |
0cb55ad2a docs: alphabetize... |
1619 |
|
c1aee215d SLUB: More docume... |
1620 1621 1622 |
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... |
1623 |
|
a99130449 [PATCH] kernel-pa... |
1624 |
noalign [KNL,ARM] |
1da177e4c Linux-2.6.12-rc2 |
1625 1626 |
noapic [SMP,APIC] Tells the kernel to not make use of any IOAPICs that may be present in the system. |
5091faa44 sched: Add 'autog... |
1627 |
noautogroup Disable scheduler automatic task group creation. |
1da177e4c Linux-2.6.12-rc2 |
1628 1629 1630 1631 |
nobats [PPC] Do not use BATs for mapping kernel lowmem on "Classic" PPC cores. nocache [ARM] |
a99130449 [PATCH] kernel-pa... |
1632 |
|
0cb55ad2a docs: alphabetize... |
1633 |
noclflush [BUGS=X86] Don't use the CLFLUSH instruction |
163ecdff0 [PATCH] delay acc... |
1634 |
nodelayacct [KNL] Disable per-task delay accounting |
1da177e4c Linux-2.6.12-rc2 |
1635 |
nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
6902aa84f doc: Add remainin... |
1636 |
nodsp [SH] Disable hardware DSP at boot time. |
6cececfce x86, documentatio... |
1637 |
noefi [X86] Disable EFI runtime services support. |
8b2cb7a8f x86: 32-bit EFI r... |
1638 |
|
1da177e4c Linux-2.6.12-rc2 |
1639 |
noexec [IA-64] |
6cececfce x86, documentatio... |
1640 |
noexec [X86] |
f5a1b191b x86: fix exec map... |
1641 |
On X86-32 available only on PAE configured kernels. |
1da177e4c Linux-2.6.12-rc2 |
1642 |
noexec=on: enable non-executable mappings (default) |
f5a1b191b x86: fix exec map... |
1643 |
noexec=off: disable non-executable mappings |
de5397ad5 x86, cpu: Enable/... |
1644 1645 1646 |
nosmep [X86] Disable SMEP (Supervisor Mode Execution Protection) even if it is supported by processor. |
f5a1b191b x86: fix exec map... |
1647 1648 1649 1650 1651 1652 |
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 |
1653 |
|
6902aa84f doc: Add remainin... |
1654 |
nofpu [SH] Disable hardware FPU at boot time. |
cd4f0ef7c doc/kernel-parame... |
1655 |
nofxsr [BUGS=X86-32] Disables x86 floating point extended |
4f8865112 [PATCH] i386: all... |
1656 1657 |
register save and restore. The kernel will only save legacy floating-point registers on task switch. |
1da177e4c Linux-2.6.12-rc2 |
1658 |
|
0c752a933 x86: introduce no... |
1659 1660 1661 |
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... |
1662 1663 1664 |
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... |
1665 |
|
cd4f0ef7c doc/kernel-parame... |
1666 |
no-hlt [BUGS=X86-32] Tells the kernel that the hlt |
1da177e4c Linux-2.6.12-rc2 |
1667 1668 |
instruction doesn't work correctly and not to use it. |
1f29fae29 file capabilities... |
1669 1670 1671 |
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 |
1672 1673 1674 1675 1676 1677 |
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... |
1678 1679 1680 |
nohz= [KNL] Boottime enable/disable dynamic ticks Valid arguments: on, off Default: on |
eeee7853c sh: Add a command... |
1681 |
noiotrap [SH] Disables trapped I/O port accesses. |
cd4f0ef7c doc/kernel-parame... |
1682 |
noirqdebug [X86-32] Disables the code which attempts to detect and |
1da177e4c Linux-2.6.12-rc2 |
1683 |
disable unhandled interrupt sources. |
6cececfce x86, documentatio... |
1684 |
no_timer_check [X86,APIC] Disables the code which tests for |
8542b200c [PATCH] paravirt:... |
1685 |
broken timer IRQ sources. |
1da177e4c Linux-2.6.12-rc2 |
1686 1687 1688 1689 |
noisapnp [ISAPNP] Disables ISA PnP code. noinitrd [RAM] Tells the kernel not to load any configured initial RAM disk. |
03ea81550 x86, intr-remap: ... |
1690 1691 |
nointremap [X86-64, Intel-IOMMU] Do not enable interrupt remapping. |
d1423d567 intr-remap: allow... |
1692 |
[Deprecated - use intremap=off] |
03ea81550 x86, intr-remap: ... |
1693 |
|
1da177e4c Linux-2.6.12-rc2 |
1694 |
nointroute [IA-64] |
162902466 Documentation: ke... |
1695 |
nojitter [IA-64] Disables jitter checking for ITC timers. |
0aa366f35 [IA64] Convert to... |
1696 |
|
9cf4c4fcb KVM: x86: explain... |
1697 |
no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver |
fd10cde92 KVM paravirt: Add... |
1698 1699 |
no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page fault handling. |
d910f5c10 KVM guest: KVM St... |
1700 1701 1702 |
no-steal-acc [X86,KVM] Disable paravirtualized steal time accounting. steal time is computed, but won't influence scheduler behaviour |
cd4f0ef7c doc/kernel-parame... |
1703 |
nolapic [X86-32,APIC] Do not enable or use the local APIC. |
1da177e4c Linux-2.6.12-rc2 |
1704 |
|
cd4f0ef7c doc/kernel-parame... |
1705 |
nolapic_timer [X86-32,APIC] Do not use the local APIC timer. |
ad62ca2bd [PATCH] i386: dis... |
1706 |
|
1da177e4c Linux-2.6.12-rc2 |
1707 1708 |
noltlbs [PPC] Do not use large page/tlb entries for kernel lowmem mapping on PPC40x. |
312f1f014 [IA64] Document t... |
1709 |
nomca [IA-64] Disable machine check abort handling |
cd4f0ef7c doc/kernel-parame... |
1710 |
nomce [X86-32] Machine Check Exception |
abe37e5a1 Documentation: Re... |
1711 |
|
83d7384f8 x86: Geode Multi-... |
1712 1713 |
nomfgpt [X86-32] Disable Multi-Function General Purpose Timer usage (for AMD Geode machines). |
bda626339 x86, NMI: Add kno... |
1714 1715 1716 |
nonmi_ipi [X86] Disable using NMI IPIs during panic/reboot to shutdown the other cpus. Instead use the REBOOT_VECTOR irq. |
02608bef8 module: add kerne... |
1717 |
nomodule Disable module load |
016ddd9b5 x86: Put 'nopat' ... |
1718 1719 |
nopat [X86] Disable PAT (page attribute table extension of pagetables) support. |
0cb55ad2a docs: alphabetize... |
1720 1721 |
norandmaps Don't use address space randomization. Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space |
bbff2168c paravirt: norepla... |
1722 |
noreplace-paravirt [X86,IA-64,PV_OPS] Don't patch paravirt_ops |
959b4fdfe [PATCH] i386: PAR... |
1723 |
|
cd4f0ef7c doc/kernel-parame... |
1724 |
noreplace-smp [X86-32,SMP] Don't replace SMP instructions |
b7fb4af06 [PATCH] i386: All... |
1725 |
with UP alternatives |
1da177e4c Linux-2.6.12-rc2 |
1726 |
noresidual [PPC] Don't use residual data on PReP machines. |
49d859d78 x86, random: Veri... |
1727 1728 1729 1730 |
nordrand [X86] Disable the direct use of the RDRAND instruction even if it is supported by the processor. RDRAND is still available to user space applications. |
a99130449 [PATCH] kernel-pa... |
1731 1732 |
noresume [SWSUSP] Disables resume and restores original swap space. |
1da177e4c Linux-2.6.12-rc2 |
1733 1734 1735 1736 1737 |
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... |
1738 |
nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. |
4f8865112 [PATCH] i386: all... |
1739 |
|
61ec7567d ACPI: boot correc... |
1740 1741 |
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 |
1742 |
|
97842216b Allow softlockup ... |
1743 |
nosoftlockup [KNL] Disable the soft-lockup detector. |
1da177e4c Linux-2.6.12-rc2 |
1744 |
nosync [HW,M68K] Disables sync negotiation for all devices. |
cd4f0ef7c doc/kernel-parame... |
1745 |
notsc [BUGS=X86-32] Disable Time Stamp Counter |
1da177e4c Linux-2.6.12-rc2 |
1746 1747 |
nousb [USB] Disable the USB subsystem |
551423748 watchdog: Improve... |
1748 |
nowatchdog [KNL] Disable the lockup detector (NMI watchdog). |
58687acba lockup_detector: ... |
1749 |
|
1da177e4c Linux-2.6.12-rc2 |
1750 |
nowb [ARM] |
a99130449 [PATCH] kernel-pa... |
1751 |
|
2b2fd87a6 docs, x86: add no... |
1752 |
nox2apic [X86-64,APIC] Do not enable x2APIC mode. |
162902466 Documentation: ke... |
1753 |
nptcg= [IA-64] Override max number of concurrent global TLB |
a6c75b86c [IA64] Kernel par... |
1754 1755 |
purges which is reported from either PAL_VM_SUMMARY or SAL PALO. |
2b633e3fa smp: Use nr_cpus=... |
1756 1757 1758 1759 1760 |
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... |
1761 |
nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
f0c0b2b80 change zonelist o... |
1762 1763 1764 1765 |
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... |
1766 1767 1768 |
ohci1394_dma=early [HW] enable debugging via the ohci1394 driver. See Documentation/debugging-via-ohci1394.txt for more info. |
3ef0e1f8c x86: olpc: add On... |
1769 1770 1771 1772 1773 1774 |
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... |
1775 1776 1777 1778 |
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 |
1779 1780 |
oprofile.timer= [HW] Use timer interrupt instead of performance counters |
7e4e0bd50 oprofile: introdu... |
1781 1782 1783 |
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... |
1784 1785 |
Format: { arch_perfmon } arch_perfmon: [X86] Force use of architectural |
7e4e0bd50 oprofile: introdu... |
1786 1787 |
perfmon on Intel CPUs instead of the CPU specific event set. |
159a80b21 oprofile, x86: Ad... |
1788 1789 1790 |
timer: [X86] Force use of architectural NMI timer mode (see also oprofile.timer for generic hr timer mode) |
dd3c4670d oprofile, s390: A... |
1791 1792 |
[s390] Force legacy basic mode sampling (report cpu_type "timer") |
1dcdb5a9e oprofile: re-add ... |
1793 |
|
44a4dcf75 Documentation: up... |
1794 1795 1796 |
oops=panic Always panic on oopses. Default is to just kill the process, but there is a small probability of deadlocking the machine. |
d404ab0a1 move x86 specific... |
1797 1798 |
This will also cause panics on machine check exceptions. Useful together with panic=30 to trigger a reboot. |
bcfde3347 sound: move drive... |
1799 1800 |
OSS [HW,OSS] See Documentation/sound/oss/oss-parameters.txt |
44a4dcf75 Documentation: up... |
1801 |
panic= [KNL] Kernel behaviour on panic: delay <timeout> |
4302fbc8e panic: panic=-1 f... |
1802 1803 1804 |
timeout > 0: seconds before rebooting timeout = 0: wait forever timeout < 0: reboot immediately |
1da177e4c Linux-2.6.12-rc2 |
1805 1806 1807 1808 1809 1810 1811 |
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... |
1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 |
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 |
1834 |
Format: [spp|ps2|epp|ecp|ecpepp] |
dd287796d [PATCH] pause_on_... |
1835 1836 1837 1838 |
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 |
1839 1840 1841 1842 |
pcbit= [HW,ISDN] pcd. [PARIDE] See header of drivers/block/paride/pcd.c. |
31c00fc15 Create/use more d... |
1843 |
See also Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
1844 |
|
a99130449 [PATCH] kernel-pa... |
1845 |
pci=option[,option...] [PCI] various PCI subsystem options: |
1cc0ca26c PCI/x86: document... |
1846 1847 |
earlydump [X86] dump PCI config space before the kernel changes anything |
c01156061 PCI: Document tha... |
1848 |
off [X86] don't probe for the PCI bus |
cd4f0ef7c doc/kernel-parame... |
1849 |
bios [X86-32] force use of PCI BIOS, don't access |
a99130449 [PATCH] kernel-pa... |
1850 1851 |
the hardware directly. Use this if your machine has a non-standard PCI host bridge. |
cd4f0ef7c doc/kernel-parame... |
1852 |
nobios [X86-32] disallow use of PCI BIOS, only direct |
a99130449 [PATCH] kernel-pa... |
1853 1854 1855 |
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... |
1856 |
conf1 [X86] Force use of PCI Configuration |
a99130449 [PATCH] kernel-pa... |
1857 |
Mechanism 1. |
c01156061 PCI: Document tha... |
1858 |
conf2 [X86] Force use of PCI Configuration |
a99130449 [PATCH] kernel-pa... |
1859 |
Mechanism 2. |
7f7857636 pci: implement "p... |
1860 1861 1862 |
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... |
1863 1864 |
nodomains [PCI] Disable support for multiple PCI root domains (aka PCI segments, in ACPI-speak). |
6cececfce x86, documentatio... |
1865 |
nommconf [X86] Disable use of MMCONFIG for PCI |
61be6d660 [PATCH] mmconfig:... |
1866 |
Configuration |
129830773 x86/PCI: add desc... |
1867 1868 1869 |
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... |
1870 1871 1872 |
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... |
1873 1874 1875 |
noioapicquirk [APIC] Disable all boot interrupt quirks. Safety option to keep boot IRQs enabled. This should never be necessary. |
9197979b5 x86, pci: introdu... |
1876 1877 1878 1879 |
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... |
1880 1881 1882 1883 |
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... |
1884 |
biosirq [X86-32] Use PCI BIOS calls to get the interrupt |
a99130449 [PATCH] kernel-pa... |
1885 1886 1887 1888 1889 1890 1891 |
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... |
1892 |
rom [X86] Assign address space to expansion ROMs. |
a99130449 [PATCH] kernel-pa... |
1893 1894 1895 |
Use with caution as certain devices share address decoders between ROMs and other resources. |
c01156061 PCI: Document tha... |
1896 |
norom [X86] Do not assign address space to |
bb71ad880 PCI: boot paramet... |
1897 1898 |
expansion ROMs that do not already have BIOS assigned address ranges. |
7bd1c365f x86/PCI: Add opti... |
1899 1900 |
nobar [X86] Do not assign address space to the BARs that weren't assigned by the BIOS. |
c01156061 PCI: Document tha... |
1901 |
irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be |
a99130449 [PATCH] kernel-pa... |
1902 1903 1904 |
assigned automatically to PCI devices. You can make the kernel exclude IRQs of your ISA cards this way. |
c01156061 PCI: Document tha... |
1905 |
pirqaddr=0xAAAAA [X86] Specify the physical address |
a99130449 [PATCH] kernel-pa... |
1906 1907 1908 |
of the PIRQ table (normally generated by the BIOS) if it is outside the F0000h-100000h range. |
c01156061 PCI: Document tha... |
1909 |
lastbus=N [X86] Scan all buses thru bus #N. Can be |
a99130449 [PATCH] kernel-pa... |
1910 1911 1912 |
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... |
1913 |
assign-busses [X86] Always assign all PCI bus |
a99130449 [PATCH] kernel-pa... |
1914 1915 |
numbers ourselves, overriding whatever the firmware may have done. |
c01156061 PCI: Document tha... |
1916 |
usepirqmask [X86] Honor the possible IRQ mask stored |
a99130449 [PATCH] kernel-pa... |
1917 1918 1919 1920 1921 |
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... |
1922 |
noacpi [X86] Do not use ACPI for IRQ routing |
a99130449 [PATCH] kernel-pa... |
1923 |
or for PCI scanning. |
7bc5e3f2b x86/PCI: use host... |
1924 1925 1926 1927 1928 1929 |
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... |
1930 1931 1932 1933 |
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=... |
1934 1935 |
skip_isa_align [X86] do not align io start addr, so can handle more pci cards |
a99130449 [PATCH] kernel-pa... |
1936 1937 1938 1939 1940 |
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... |
1941 1942 1943 1944 1945 |
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... |
1946 1947 1948 1949 |
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... |
1950 1951 1952 1953 1954 1955 |
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... |
1956 1957 1958 1959 1960 1961 1962 1963 1964 |
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 ... |
1965 1966 1967 1968 1969 1970 |
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. |
b55438fdd PCI: prepare pci=... |
1971 1972 1973 1974 1975 1976 1977 |
realloc= Enable/disable reallocating PCI bridge resources if allocations done by BIOS are too small to accommodate resources required by all child devices. off: Turn realloc off on: Turn realloc on realloc same as realloc=on |
6748dcc26 PCI / PCIe: Intro... |
1978 |
noari do not use PCIe ARI. |
284f5f9db PCI: work around ... |
1979 1980 1981 |
pcie_scan_all Scan all possible PCIe devices. Otherwise we only look for one device below a PCIe downstream port. |
6b4b78fed PCI: optionally s... |
1982 |
|
e5665a45f PCI: document the... |
1983 1984 1985 1986 1987 |
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. |
7570a333d PCI: Add pcie_hp=... |
1988 1989 1990 |
pcie_hp= [PCIE] PCI Express Hotplug driver options: nomsi Do not use MSI for PCI Express Native Hotplug (this makes all PCIe ports use INTx for hotplug services). |
79dd9182d PCI: PCIe: Introd... |
1991 |
pcie_ports= [PCIE] PCIe ports handling: |
28eb5f274 PCI: PCIe: Ask BI... |
1992 1993 1994 1995 1996 |
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. |
79dd9182d PCI: PCIe: Introd... |
1997 1998 |
compat Treat PCIe ports as PCI-to-PCI bridges, disable the PCIe ports driver. |
c7f486567 PCI PM: PCIe PME ... |
1999 |
pcie_pme= [PCIE,PM] Native PCIe PME signaling options: |
c39fae141 PCI PM: Make it p... |
2000 |
nomsi Do not use MSI for native PCIe PME signaling (this makes |
28eb5f274 PCI: PCIe: Ask BI... |
2001 |
all PCIe root ports use INTx for all services). |
c7f486567 PCI PM: PCIe PME ... |
2002 |
|
1da177e4c Linux-2.6.12-rc2 |
2003 2004 2005 |
pcmv= [HW,PCMCIA] BadgePAD 4 pd. [PARIDE] |
31c00fc15 Create/use more d... |
2006 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
2007 2008 2009 2010 2011 |
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... |
2012 |
percpu_alloc= Select which percpu first chunk allocator to use. |
e933a73f4 percpu: kill lpag... |
2013 2014 2015 2016 2017 |
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... |
2018 |
|
1da177e4c Linux-2.6.12-rc2 |
2019 |
pf. [PARIDE] |
31c00fc15 Create/use more d... |
2020 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
2021 2022 |
pg. [PARIDE] |
31c00fc15 Create/use more d... |
2023 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
2024 2025 |
pirq= [SMP,APIC] Manual mp-table setup |
71cced6eb doc/x86: fix doc ... |
2026 |
See Documentation/x86/i386/IO-APIC.txt. |
1da177e4c Linux-2.6.12-rc2 |
2027 2028 2029 2030 |
plip= [PPT,NET] Parallel port network link Format: { parport<nr> | timid | 0 } See also Documentation/parport.txt. |
162902466 Documentation: ke... |
2031 |
pmtmr= [X86] Manual setup of pmtmr I/O Port. |
de32a2434 kernel-paramaters... |
2032 2033 |
Override pmtimer IOPort with a hex value. e.g. pmtmr=0x508 |
96242116d PNP: update pnp.d... |
2034 2035 2036 2037 2038 2039 |
pnp.debug=1 [PNP] Enable PNP debug messages (depends on the CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time via /sys/module/pnp/parameters/debug. We always show current resource usage; turning this on also shows possible settings and some assignment information. |
97ef062bb PNP: add CONFIG_P... |
2040 |
|
1da177e4c Linux-2.6.12-rc2 |
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 |
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... |
2054 |
Ranges are in pairs (I/O port base and size). |
1da177e4c Linux-2.6.12-rc2 |
2055 2056 |
pnp_reserve_mem= |
a99130449 [PATCH] kernel-pa... |
2057 2058 |
[ISAPNP] Exclude memory regions for the autoconfiguration. |
1da177e4c Linux-2.6.12-rc2 |
2059 |
Ranges are in pairs (memory base and size). |
4af94f390 doc: fix kernel-p... |
2060 2061 2062 2063 2064 |
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... |
2065 2066 |
print-fatal-signals= [KNL] debug: print fatal signals |
f84d49b21 signal: Print war... |
2067 2068 2069 2070 2071 2072 2073 2074 |
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... |
2075 |
default: off. |
c22ab3329 kmsg_dump: don't ... |
2076 2077 2078 2079 2080 |
printk.always_kmsg_dump= Trigger kmsg_dump for cases other than kernel oops or panics Format: <bool> (1/Y/y=enable, 0/N/n=disable) default: disabled |
e84845c4b add printk.time o... |
2081 2082 |
printk.time= Show timing data prefixed to each printk message line Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
0cb55ad2a docs: alphabetize... |
2083 2084 2085 2086 2087 2088 2089 |
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 |
2090 |
profile= [KNL] Enable kernel profiling via /proc/profile |
a99130449 [PATCH] kernel-pa... |
2091 2092 2093 2094 |
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... |
2095 2096 |
Param: "sleep" - profile D-state sleeping (millisecs). Requires CONFIG_SCHEDSTATS |
c0fe2e696 Add missing profi... |
2097 |
Param: "kvm" - profile VM exits. |
1da177e4c Linux-2.6.12-rc2 |
2098 |
|
1da177e4c Linux-2.6.12-rc2 |
2099 2100 |
prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk before loading. |
31c00fc15 Create/use more d... |
2101 |
See Documentation/blockdev/ramdisk.txt. |
1da177e4c Linux-2.6.12-rc2 |
2102 |
|
a99130449 [PATCH] kernel-pa... |
2103 2104 |
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 |
2105 2106 |
psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports per second. |
a99130449 [PATCH] kernel-pa... |
2107 2108 |
psmouse.resetafter= [HW,MOUSE] Try to reset the device after so many bad packets |
1da177e4c Linux-2.6.12-rc2 |
2109 2110 2111 2112 |
(0 = never). psmouse.resolution= [HW,MOUSE] Set desired mouse resolution, in dpi. psmouse.smartscroll= |
a99130449 [PATCH] kernel-pa... |
2113 |
[HW,MOUSE] Controls Logitech smartscroll autorepeat. |
1da177e4c Linux-2.6.12-rc2 |
2114 |
0 = disabled, 1 = enabled (default). |
dee28e72b pstore: Allow the... |
2115 |
pstore.backend= Specify the name of the pstore backend to use |
1da177e4c Linux-2.6.12-rc2 |
2116 |
pt. [PARIDE] |
31c00fc15 Create/use more d... |
2117 |
See Documentation/blockdev/paride.txt. |
1da177e4c Linux-2.6.12-rc2 |
2118 |
|
dc8c85871 PTY: add kernel p... |
2119 2120 2121 |
pty.legacy_count= [KNL] Number of legacy pty's. Overwrites compiled-in default number. |
7d2c502f1 [PATCH] doc: fix ... |
2122 |
quiet [KNL] Disable most log messages |
a99130449 [PATCH] kernel-pa... |
2123 |
|
1da177e4c Linux-2.6.12-rc2 |
2124 2125 2126 2127 |
r128= [HW,DRM] raid= [HW,RAID] See Documentation/md.txt. |
a99130449 [PATCH] kernel-pa... |
2128 |
ramdisk_blocksize= [RAM] |
31c00fc15 Create/use more d... |
2129 |
See Documentation/blockdev/ramdisk.txt. |
a99130449 [PATCH] kernel-pa... |
2130 |
|
1da177e4c Linux-2.6.12-rc2 |
2131 |
ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
31c00fc15 Create/use more d... |
2132 |
See Documentation/blockdev/ramdisk.txt. |
1da177e4c Linux-2.6.12-rc2 |
2133 |
|
dabb8aa96 rcu: Document ker... |
2134 |
rcutree.blimit= [KNL,BOOT] |
24aaef8d7 Documentation: U... |
2135 2136 |
Set maximum number of finished RCU callbacks to process in one batch. |
21a1ea9eb [PATCH] rcu batch... |
2137 |
|
f885b7f2b rcu: Control RCU_... |
2138 2139 2140 2141 |
rcutree.fanout_leaf= [KNL,BOOT] Increase the number of CPUs assigned to each leaf rcu_node structure. Useful for very large systems. |
dabb8aa96 rcu: Document ker... |
2142 |
rcutree.qhimark= [KNL,BOOT] |
24aaef8d7 Documentation: U... |
2143 |
Set threshold of queued |
21a1ea9eb [PATCH] rcu batch... |
2144 |
RCU callbacks over which batch limiting is disabled. |
dabb8aa96 rcu: Document ker... |
2145 |
rcutree.qlowmark= [KNL,BOOT] |
24aaef8d7 Documentation: U... |
2146 2147 |
Set threshold of queued RCU callbacks below which batch limiting is re-enabled. |
21a1ea9eb [PATCH] rcu batch... |
2148 |
|
dabb8aa96 rcu: Document ker... |
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 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 |
rcutree.rcu_cpu_stall_suppress= [KNL,BOOT] Suppress RCU CPU stall warning messages. rcutree.rcu_cpu_stall_timeout= [KNL,BOOT] Set timeout for RCU CPU stall warning messages. rcutorture.fqs_duration= [KNL,BOOT] Set duration of force_quiescent_state bursts. rcutorture.fqs_holdoff= [KNL,BOOT] Set holdoff time within force_quiescent_state bursts. rcutorture.fqs_stutter= [KNL,BOOT] Set wait time between force_quiescent_state bursts. rcutorture.irqreader= [KNL,BOOT] Test RCU readers from irq handlers. rcutorture.n_barrier_cbs= [KNL,BOOT] Set callbacks/threads for rcu_barrier() testing. rcutorture.nfakewriters= [KNL,BOOT] Set number of concurrent RCU writers. These just stress RCU, they don't participate in the actual test, hence the "fake". rcutorture.nreaders= [KNL,BOOT] Set number of RCU readers. rcutorture.onoff_holdoff= [KNL,BOOT] Set time (s) after boot for CPU-hotplug testing. rcutorture.onoff_interval= [KNL,BOOT] Set time (s) between CPU-hotplug operations, or zero to disable CPU-hotplug testing. rcutorture.shuffle_interval= [KNL,BOOT] Set task-shuffle interval (s). Shuffling tasks allows some CPUs to go into dyntick-idle mode during the rcutorture test. rcutorture.shutdown_secs= [KNL,BOOT] Set time (s) after boot system shutdown. This is useful for hands-off automated testing. rcutorture.stall_cpu= [KNL,BOOT] Duration of CPU stall (s) to test RCU CPU stall warnings, zero to disable. rcutorture.stall_cpu_holdoff= [KNL,BOOT] Time to wait (s) after boot before inducing stall. rcutorture.stat_interval= [KNL,BOOT] Time (s) between statistics printk()s. rcutorture.stutter= [KNL,BOOT] Time (s) to stutter testing, for example, specifying five seconds causes the test to run for five seconds, wait for five seconds, and so on. This tests RCU's ability to transition abruptly to and from idle. rcutorture.test_boost= [KNL,BOOT] Test RCU priority boosting? 0=no, 1=maybe, 2=yes. "Maybe" means test if the RCU implementation under test support RCU priority boosting. rcutorture.test_boost_duration= [KNL,BOOT] Duration (s) of each individual boost test. rcutorture.test_boost_interval= [KNL,BOOT] Interval (s) between each boost test. rcutorture.test_no_idle_hz= [KNL,BOOT] Test RCU's dyntick-idle handling. See also the rcutorture.shuffle_interval parameter. rcutorture.torture_type= [KNL,BOOT] Specify the RCU implementation to test. rcutorture.verbose= [KNL,BOOT] Enable additional printk() statements. |
ffdfc4097 [PATCH] Add rdini... |
2230 2231 2232 2233 |
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... |
2234 |
reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
1da177e4c Linux-2.6.12-rc2 |
2235 |
Format: <reboot_mode>[,<reboot_mode2>[,...]] |
ecb08d813 doc: reformat som... |
2236 |
See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
1da177e4c Linux-2.6.12-rc2 |
2237 |
|
46b6d94eb doc: document the... |
2238 2239 |
relax_domain_level= [KNL, SMP] Set scheduler's default relax_domain_level. |
21acb9caa trivial: fix wher... |
2240 |
See Documentation/cgroups/cpusets.txt. |
46b6d94eb doc: document the... |
2241 |
|
1da177e4c Linux-2.6.12-rc2 |
2242 |
reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
cd4f0ef7c doc/kernel-parame... |
2243 |
reservetop= [X86-32] |
461a9afff [PATCH] x86: add ... |
2244 2245 2246 |
Format: nn[KMG] Reserves a hole at the top of the kernel virtual address space. |
9ea77bdb3 x86, bios: Make t... |
2247 2248 2249 2250 |
reservelow= [X86] Format: nn[K] Set the amount of memory to reserve for BIOS at the bottom of the address space. |
7e96287dd [PATCH] kdump: in... |
2251 2252 |
reset_devices [KNL] Force drivers to reset the underlying device during initialization. |
a99130449 [PATCH] kernel-pa... |
2253 2254 |
resume= [SWSUSP] Specify the partition device for software suspend |
2df83fa4b PM / Hibernate: U... |
2255 2256 |
Format: {/dev/<dev> | PARTUUID=<uuid> | <int>:<int> | <hex>} |
1da177e4c Linux-2.6.12-rc2 |
2257 |
|
ecbd0da1e [PATCH] swsusp: d... |
2258 2259 2260 2261 2262 |
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 |
f126f7334 PM / Hibernate: A... |
2263 2264 |
resumedelay= [HIBERNATION] Delay (in seconds) to pause before attempting to read the resume files |
6f8d7022a PM / Hibernate: A... |
2265 2266 2267 |
resumewait [HIBERNATION] Wait (indefinitely) for resume device to show up. Useful for devices that are detected asynchronously (e.g. USB and MMC devices). |
f996fc967 PM / Hibernate: C... |
2268 2269 2270 2271 |
hibernate= [HIBERNATION] noresume Don't check if there's a hibernation image present during boot. nocompress Don't compress/decompress hibernation images. |
0a7b35cb1 [PATCH] Add retai... |
2272 |
retain_initrd [RAM] Keep initrd memory after extraction |
1da177e4c Linux-2.6.12-rc2 |
2273 2274 2275 2276 2277 2278 2279 2280 2281 |
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 |
f2d34fd94 Documentation: ad... |
2282 |
See name_to_dev_t comment in init/do_mounts.c. |
1da177e4c Linux-2.6.12-rc2 |
2283 2284 2285 2286 2287 2288 2289 |
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... |
2290 2291 2292 |
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 |
2293 2294 2295 2296 2297 2298 |
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 |
2299 |
sbni= [NET] Granch SBNI12 leased line adapter |
a99130449 [PATCH] kernel-pa... |
2300 |
|
f6630114d sched: Limit the ... |
2301 |
sched_debug [KNL] Enables verbose scheduler debug messages. |
5307c9556 tick: Add tick sk... |
2302 2303 2304 2305 2306 2307 2308 2309 |
skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate xtime_lock contention on larger systems, and/or RCU lock contention on all systems with CONFIG_MAXSMP set. Format: { "0" | "1" } 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1" 1 -- enable. Note: increases power consumption, thus should only be enabled if running jitter sensitive (HPC/RT) workloads. |
0cb55ad2a docs: alphabetize... |
2310 2311 2312 2313 2314 2315 2316 |
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 |
2317 2318 2319 2320 2321 2322 2323 |
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. |
c1c124e91 AppArmor: update ... |
2324 2325 2326 2327 2328 2329 |
apparmor= [APPARMOR] Disable or enable AppArmor at boot time Format: { "0" | "1" } See security/apparmor/Kconfig help text 0 -- disable. 1 -- enable. Default value is set via kernel config option. |
cd4f0ef7c doc/kernel-parame... |
2330 |
serialnumber [BUGS=X86-32] |
1da177e4c Linux-2.6.12-rc2 |
2331 |
|
1da177e4c Linux-2.6.12-rc2 |
2332 2333 |
shapers= [NET] Maximal number of shapers. |
a99130449 [PATCH] kernel-pa... |
2334 |
|
b05f78f5c x86_64: printout ... |
2335 2336 2337 2338 2339 |
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 |
2340 2341 |
simeth= [IA-64] simscsi= |
a99130449 [PATCH] kernel-pa... |
2342 |
|
1da177e4c Linux-2.6.12-rc2 |
2343 |
slram= [HW,MTD] |
3df1cccdf slab: introduce s... |
2344 2345 2346 2347 2348 |
slab_max_order= [MM, SLAB] Determines the maximum allowed order for slabs. A high setting may cause OOMs due to memory fragmentation. Defaults to 1 for systems with more than 32MB of RAM, 0 otherwise. |
f0630fff5 SLUB: support slu... |
2349 2350 2351 2352 2353 2354 2355 |
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... |
2356 2357 |
slub_max_order= [MM, SLUB] |
f0630fff5 SLUB: support slu... |
2358 2359 2360 2361 |
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... |
2362 2363 |
slub_min_objects= [MM, SLUB] |
f0630fff5 SLUB: support slu... |
2364 2365 2366 2367 2368 2369 |
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... |
2370 2371 2372 |
For more information see Documentation/vm/slub.txt. slub_min_order= [MM, SLUB] |
24775d652 Documentation: Fi... |
2373 |
Determines the minimum page order for slabs. Must be |
f0630fff5 SLUB: support slu... |
2374 |
lower than slub_max_order. |
c1aee215d SLUB: More docume... |
2375 2376 2377 |
For more information see Documentation/vm/slub.txt. slub_nomerge [MM, SLUB] |
f0630fff5 SLUB: support slu... |
2378 |
Disable merging of slabs with similar size. May be |
c1aee215d SLUB: More docume... |
2379 |
necessary if there is some reason to distinguish |
f0630fff5 SLUB: support slu... |
2380 2381 |
allocs to different slabs. Debug options disable merging on their own. |
c1aee215d SLUB: More docume... |
2382 |
For more information see Documentation/vm/slub.txt. |
1da177e4c Linux-2.6.12-rc2 |
2383 2384 |
smart2= [HW] Format: <io1>[,<io2>[,...,<io8>]] |
cd4f0ef7c doc/kernel-parame... |
2385 |
smp-alt-once [X86-32,SMP] On a hotplug CPU system, only |
b7fb4af06 [PATCH] i386: All... |
2386 |
attempt to substitute SMP alternatives once at boot. |
d0d4f69bb smsc-ircc2: add P... |
2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 |
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 |
9c44bc03f softlockup: allow... |
2397 2398 |
softlockup_panic= [KNL] Should the soft-lockup detector generate panics. |
44a4dcf75 Documentation: up... |
2399 |
Format: <integer> |
9c44bc03f softlockup: allow... |
2400 |
|
1da177e4c Linux-2.6.12-rc2 |
2401 |
sonypi.*= [HW] Sony Programmable I/O Control Device driver |
395cf9691 doc: fix broken r... |
2402 |
See Documentation/laptops/sonypi.txt |
1da177e4c Linux-2.6.12-rc2 |
2403 2404 |
specialix= [HW,SERIAL] Specialix multi-serial port adapter |
31c00fc15 Create/use more d... |
2405 |
See Documentation/serial/specialix.txt. |
1da177e4c Linux-2.6.12-rc2 |
2406 2407 2408 2409 2410 |
spia_io_base= [HW,MTD] spia_fio_base= spia_pedr= spia_peddr= |
f38f1d2aa trace: add a way ... |
2411 2412 |
stacktrace [FTRACE] Enabled the stack tracer on boot up. |
762e12078 tracing: Have sta... |
2413 2414 2415 2416 2417 2418 2419 |
stacktrace_filter=[function-list] [FTRACE] Limit the functions that the stack tracer will trace at boot up. function-list is a comma separated list of functions. This list can be changed at run time by the stack_trace_filter file in the debugfs tracing directory. Note, this enables stack tracing and the stacktrace above is not needed. |
1da177e4c Linux-2.6.12-rc2 |
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 |
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... |
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 |
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... |
2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 |
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... |
2458 2459 2460 2461 2462 2463 2464 2465 |
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. |
a42c390cf cgroups: make swa... |
2466 2467 2468 2469 |
swapaccount[=0|1] [KNL] Enable accounting of swap in memory resource controller if no parameter or 1 is given or disable it if 0 is given (See Documentation/cgroups/memory.txt) |
1da177e4c Linux-2.6.12-rc2 |
2470 |
swiotlb= [IA-64] Number of I/O TLB slabs |
a99130449 [PATCH] kernel-pa... |
2471 |
|
1da177e4c Linux-2.6.12-rc2 |
2472 |
switches= [HW,M68k] |
e52eec13c SYSFS: Allow boot... |
2473 2474 2475 2476 2477 2478 2479 2480 |
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. |
5d6f647fc [PATCH] debug: ad... |
2481 2482 2483 2484 2485 |
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 |
2486 |
tdfx= [HW,DRM] |
77437fd4e pm: boot time sus... |
2487 2488 2489 2490 2491 |
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 |
2492 2493 |
thash_entries= [KNL,NET] Set number of hash buckets for TCP connection |
f8707ec96 ACPI: thermal: cr... |
2494 2495 2496 |
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... |
2497 2498 |
thermal.crt= [HW,ACPI] -1: disable all critical trip points in all thermal zones |
22a94d79a ACPI: Allow overr... |
2499 |
<degrees C>: override all critical trip points |
c52a7419a ACPI: thermal: cr... |
2500 |
|
f54871456 ACPI: thermal: cr... |
2501 2502 2503 |
thermal.nocrt= [HW,ACPI] Set to disable actions on ACPI thermal zone critical and hot trip points. |
72b33ef8b ACPI: thermal: cr... |
2504 2505 |
thermal.off= [HW,ACPI] 1: disable ACPI thermal control |
a70cdc520 ACPI: thermal: cr... |
2506 2507 |
thermal.psv= [HW,ACPI] -1: disable all passive trip points |
ada9cfdd1 doc: fix kernel-p... |
2508 2509 |
<degrees C>: override all passive trip points to this value |
a70cdc520 ACPI: thermal: cr... |
2510 |
|
730ff34de ACPI: thermal: ex... |
2511 2512 2513 2514 |
thermal.tzp= [HW,ACPI] Specify global default ACPI thermal zone polling rate <deci-seconds>: poll all this frequency 0: no polling (default) |
8d32a307e genirq: Provide f... |
2515 2516 |
threadirqs [KNL] Force threading of all interrupt handlers except those |
24775d652 Documentation: Fi... |
2517 |
marked explicitly IRQF_NO_THREAD. |
8d32a307e genirq: Provide f... |
2518 |
|
2b1a61f0a [S390] cpu topolo... |
2519 2520 2521 |
topology= [S390] Format: {off | on} Specify if the kernel should make use of the cpu |
f65e51d74 Documentation: fi... |
2522 2523 |
topology information if the hardware supports this. The scheduler will make use of this information and |
2b1a61f0a [S390] cpu topolo... |
2524 |
e.g. base its process migration decisions on it. |
c9af3fa9e [S390] topology: ... |
2525 |
Default is on. |
2b1a61f0a [S390] cpu topolo... |
2526 |
|
1da177e4c Linux-2.6.12-rc2 |
2527 |
tp720= [HW,PS2] |
225a9be24 TPM: workaround t... |
2528 2529 2530 2531 2532 2533 2534 2535 |
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... |
2536 2537 |
trace_buf_size=nn[KMG] [FTRACE] will set tracing buffer size. |
631595fbf doc: add trace_bu... |
2538 |
|
020e5f85c tracing/events: A... |
2539 2540 2541 2542 |
trace_event=[event-list] [FTRACE] Set and start specified trace events in order to facilitate early boot debugging. See also Documentation/trace/events.txt |
fcf4d8212 thp: documentatio... |
2543 2544 2545 2546 2547 2548 |
transparent_hugepage= [KNL] Format: [always|madvise|never] Can be used to control the default behavior of the system with respect to transparent hugepages. See Documentation/vm/transhuge.txt for more details. |
d3b8f889a x86: Make tsc=rel... |
2549 |
tsc= Disable clocksource stability checks for TSC. |
395628ef4 x86: Skip verific... |
2550 2551 |
Format: <string> [x86] reliable: mark tsc clocksource as reliable, this |
d3b8f889a x86: Make tsc=rel... |
2552 2553 2554 2555 |
disables clocksource verification at runtime, as well as the stability checks done at bootup. Used to enable high-resolution timer mode on older hardware, and in virtualized environment. |
e82b8e4ea x86: Add IRQ_TIME... |
2556 2557 2558 2559 |
[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. |
395628ef4 x86: Skip verific... |
2560 |
|
a99130449 [PATCH] kernel-pa... |
2561 2562 2563 2564 |
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 |
2565 |
See also Documentation/input/joystick-parport.txt |
b6935f8cd Document powerpc ... |
2566 2567 2568 2569 |
udbg-immortal [PPC] When debugging early kernel crashes that happen after console_init() and before a proper console driver takes over, this boot options might help "seeing" what's going on. |
f86dcc5aa udp: dynamically ... |
2570 2571 |
uhash_entries= [KNL,NET] Set number of hash buckets for UDP/UDP-Lite connections |
5f8364b7d UHCI: module para... |
2572 2573 2574 2575 2576 2577 2578 |
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_... |
2579 |
unknown_nmi_panic |
44a4dcf75 Documentation: up... |
2580 |
[X86] Cause panic on unknown NMI. |
e3a61b0a8 x86: add unknown_... |
2581 |
|
c4fc2342c USB: Add "authori... |
2582 2583 2584 2585 |
usbcore.authorized_default= [USB] Default USB device authorization: (default -1 = authorized except for wireless USB, 0 = not authorized, 1 = authorized) |
b5e795f8d USB: make autosus... |
2586 2587 2588 2589 2590 |
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... |
2591 |
to a negative value won't be autosuspended at all. |
b5e795f8d USB: make autosus... |
2592 |
|
fd7c519dd USB: hub.c: Add i... |
2593 2594 2595 2596 2597 2598 2599 2600 2601 |
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). |
3f5eb8d56 USB: make the usb... |
2602 2603 2604 |
usbcore.usbfs_memory_mb= [USB] Memory limit (in MB) for buffers allocated by usbfs (default = 16, 0 = max = 2047). |
fd7c519dd USB: hub.c: Add i... |
2605 2606 2607 2608 2609 2610 2611 2612 |
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 |
2613 2614 |
usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. |
a99130449 [PATCH] kernel-pa... |
2615 |
|
d4f373e57 USB: usb-storage:... |
2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 |
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... |
2628 2629 |
a = SANE_SENSE (collect more than 18 bytes of sense data); |
a0bb10811 USB: usb-storage:... |
2630 2631 |
b = BAD_SENSE (don't collect more than 18 bytes of sense data); |
d4f373e57 USB: usb-storage:... |
2632 2633 |
c = FIX_CAPACITY (decrease the reported device capacity by one sector); |
5116901d8 usb-storage: Corr... |
2634 2635 2636 2637 |
d = NO_READ_DISC_INFO (don't use READ_DISC_INFO command); e = NO_READ_CAPACITY_16 (don't use READ_CAPACITY_16 command); |
c838ea462 USB: storage: mak... |
2638 2639 2640 |
h = CAPACITY_HEURISTICS (decrease the reported device capacity by one sector if the number is odd); |
d4f373e57 USB: usb-storage:... |
2641 2642 2643 2644 2645 2646 |
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); |
21c13a4f7 usb-storage: redo... |
2647 2648 |
n = INITIAL_READ10 (force a retry of the initial READ(10) command); |
c838ea462 USB: storage: mak... |
2649 2650 |
o = CAPACITY_OK (accept the capacity reported by the device); |
eaa05dfcd [SCSI] usb-storag... |
2651 2652 |
p = WRITE_CACHE (the device cache is ON by default); |
d4f373e57 USB: usb-storage:... |
2653 2654 2655 2656 2657 2658 2659 |
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 |
ac1667db0 Documentation: ad... |
2660 2661 2662 2663 2664 2665 2666 2667 2668 |
user_debug= [KNL,ARM] Format: <int> See arch/arm/Kconfig.debug help text. 1 - undefined instruction events 2 - system calls 4 - invalid data aborts 8 - SIGSEGV faults 16 - SIGBUS faults Example: user_debug=31 |
143155920 x86, mm: Allow hi... |
2669 2670 2671 2672 2673 2674 |
userpte= [X86] Flags controlling user PTE allocations. nohigh = do not allocate PTE pages in HIGHMEM regardless of setting of CONFIG_HIGHPTE. |
6cececfce x86, documentatio... |
2675 |
vdso= [X86,SH] |
1dbf527c5 [PATCH] i386: Mak... |
2676 |
vdso=2: enable compat VDSO (default with COMPAT_VDSO) |
e6e5494cb [PATCH] vdso: ran... |
2677 2678 |
vdso=1: enable VDSO (default) vdso=0: disable VDSO mapping |
6cececfce x86, documentatio... |
2679 |
vdso32= [X86] |
af65d6484 x86 vDSO: consoli... |
2680 2681 2682 |
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... |
2683 2684 |
vector= [IA-64,SMP] vector=percpu: enable percpu vector domain |
1da177e4c Linux-2.6.12-rc2 |
2685 2686 |
video= [FB] Frame buffer configuration See Documentation/fb/modedb.txt. |
81a054ce0 virtio-mmio: Devi... |
2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 |
virtio_mmio.device= [VMMIO] Memory mapped virtio (platform) device. <size>@<baseaddr>:<irq>[:<id>] where: <size> := size (can use standard suffixes like K, M and G) <baseaddr> := physical base address <irq> := interrupt number (as passed to request_irq()) <id> := (optional) platform device id example: virtio_mmio.device=1K@0x100b0000:48:7 Can be used multiple times for multiple devices. |
cd4f0ef7c doc/kernel-parame... |
2702 |
vga= [BOOT,X86-32] Select a particular video mode |
954a8b816 x86, doc: fix ref... |
2703 |
See Documentation/x86/boot.txt and |
a99130449 [PATCH] kernel-pa... |
2704 |
Documentation/svga.txt. |
1da177e4c Linux-2.6.12-rc2 |
2705 2706 2707 |
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... |
2708 |
vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
1da177e4c Linux-2.6.12-rc2 |
2709 2710 2711 2712 |
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... |
2713 2714 |
vmhalt= [KNL,S390] Perform z/VM CP command after system halt. Format: <command> |
1da177e4c Linux-2.6.12-rc2 |
2715 |
|
585c3047a [S390] Add vmpani... |
2716 2717 2718 2719 2720 |
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... |
2721 |
|
3ae36655b x86-64: Rework vs... |
2722 2723 2724 2725 2726 2727 2728 |
vsyscall= [X86-64] Controls the behavior of vsyscalls (i.e. calls to fixed addresses of 0xffffffffff600x00 from legacy code). Most statically-linked binaries and older versions of glibc use these calls. Because these functions are at fixed addresses, they make nice targets for exploits that can control RIP. |
2e57ae051 x86: Default to v... |
2729 2730 |
emulate [default] Vsyscalls turn into traps and are emulated reasonably safely. |
3ae36655b x86-64: Rework vs... |
2731 |
|
2e57ae051 x86: Default to v... |
2732 |
native Vsyscalls are native syscall instructions. |
3ae36655b x86-64: Rework vs... |
2733 2734 2735 2736 2737 2738 2739 2740 |
This is a little bit faster than trapping and makes a few dynamic recompilers work better than they would in emulation mode. It also makes exploits much easier to write. none Vsyscalls don't work at all. This makes them quite hard to use for exploits but might break your system. |
9ea9a886b vt: make the defa... |
2741 2742 2743 2744 |
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... |
2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 |
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... |
2769 2770 2771 2772 2773 2774 2775 2776 |
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. |
4724ba575 watchdog: update/... |
2777 2778 2779 2780 |
watchdog timers [HW,WDT] For information on watchdog timers, see Documentation/watchdog/watchdog-parameters.txt or other driver-specific files in the Documentation/watchdog/ directory. |
1da177e4c Linux-2.6.12-rc2 |
2781 |
|
0cb55ad2a docs: alphabetize... |
2782 2783 2784 |
x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of default x2apic cluster mode on platforms supporting x2apic. |
bb24c4716 x86, apbt: Moores... |
2785 2786 2787 2788 2789 |
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 |
2790 2791 |
xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. xd_geo= See header of drivers/block/xd.c. |
c1c5413ad x86: Unplug emula... |
2792 2793 2794 2795 2796 2797 2798 |
xen_emul_unplug= [HW,X86,XEN] Unplug Xen emulated devices Format: [unplug0,][unplug1] ide-disks -- unplug primary master IDE devices aux-ide-disks -- unplug non-primary-master IDE devices nics -- unplug network devices all -- unplug all emulated devices (NICs and IDE disks) |
1dc7ce99b xen: pvhvm: renam... |
2799 2800 2801 |
unnecessary -- unplugging emulated devices is unnecessary even if the host did not respond to the unplug protocol |
c93a4dfb3 xen: pvhvm: allow... |
2802 |
never -- do not unplug even if version check succeeds |
c1c5413ad x86: Unplug emula... |
2803 |
|
1da177e4c Linux-2.6.12-rc2 |
2804 |
xirc2ps_cs= [NET,PCMCIA] |
a99130449 [PATCH] kernel-pa... |
2805 2806 |
Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
1da177e4c Linux-2.6.12-rc2 |
2807 |
|
a99130449 [PATCH] kernel-pa... |
2808 |
______________________________________________________________________ |
1da177e4c Linux-2.6.12-rc2 |
2809 2810 |
TODO: |
1da177e4c Linux-2.6.12-rc2 |
2811 |
Add more DRM drivers. |