Documentation / kernel-parameters.txt

Custom Search

Based on kernel version 2.6.32. Page generated on 2009-12-11 16:22 EST.

	                          Kernel Parameters
	                          ~~~~~~~~~~~~~~~~~
	
	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
	
	Hyphens (dashes) and underscores are equivalent in parameter names, so
		log_buf_len=1M print-fatal-signals=1
	can also be entered as
		log-buf-len=1M print_fatal_signals=1
	
	
	This document may not be entirely up to date and comprehensive. The command
	"modinfo -p ${modulename}" shows a current list of all parameters of a loadable
	module. Loadable modules, after being loaded into the running kernel, also
	reveal their parameters in /sys/module/${modulename}/parameters/. Some of these
	parameters may be changed at runtime by the command
	"echo -n ${value} > /sys/module/${modulename}/parameters/${parm}".
	
	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:
	
		ACPI	ACPI support is enabled.
		AGP	AGP (Accelerated Graphics Port) is enabled.
		ALSA	ALSA sound support is enabled.
		APIC	APIC support is enabled.
		APM	Advanced Power Management support is enabled.
		AVR32	AVR32 architecture is enabled.
		AX25	Appropriate AX.25 support is enabled.
		BLACKFIN Blackfin architecture is enabled.
		DRM	Direct Rendering Management support is enabled.
		EDD	BIOS Enhanced Disk Drive Services (EDD) is enabled
		EFI	EFI Partitioning (GPT) is enabled
		EIDE	EIDE/ATAPI support is enabled.
		FB	The frame buffer device is enabled.
		GCOV	GCOV profiling is enabled.
		HW	Appropriate hardware is enabled.
		IA-64	IA-64 architecture is enabled.
		IMA     Integrity measurement architecture is enabled.
		IOSCHED	More than one I/O scheduler is enabled.
		IP_PNP	IP DHCP, BOOTP, or RARP is enabled.
		ISAPNP	ISA PnP code is enabled.
		ISDN	Appropriate ISDN support is enabled.
		JOY	Appropriate joystick support is enabled.
		KVM	Kernel Virtual Machine support is enabled.
		LIBATA  Libata driver is enabled
		LP	Printer support is enabled.
		LOOP	Loopback device support is enabled.
		M68k	M68k architecture is enabled.
				These options have more detailed description inside of
				Documentation/m68k/kernel-options.txt.
		MCA	MCA bus support is enabled.
		MDA	MDA console support is enabled.
		MOUSE	Appropriate mouse support is enabled.
		MSI	Message Signaled Interrupts (PCI).
		MTD	MTD (Memory Technology Device) support is enabled.
		NET	Appropriate network support is enabled.
		NUMA	NUMA support is enabled.
		GENERIC_TIME The generic timeofday code is enabled.
		NFS	Appropriate NFS support is enabled.
		OSS	OSS sound support is enabled.
		PV_OPS	A paravirtualized kernel is enabled.
		PARIDE	The ParIDE (parallel port IDE) subsystem is enabled.
		PARISC	The PA-RISC architecture is enabled.
		PCI	PCI bus support is enabled.
		PCIE	PCI Express support is enabled.
		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.
		ROOTPLUG The example Root Plug LSM is enabled.
		S390	S390 architecture is enabled.
		SCSI	Appropriate SCSI support is enabled.
				A lot of drivers has their options described inside of
				Documentation/scsi/.
		SECURITY Different security models are enabled.
		SELINUX SELinux support is enabled.
		SERIAL	Serial support is enabled.
		SH	SuperH architecture is enabled.
		SMP	The kernel is an SMP kernel.
		SPARC	Sparc architecture is enabled.
		SWSUSP	Software suspend (hibernation) is enabled.
		SUSPEND	System suspend states are enabled.
		FTRACE	Function tracing enabled.
		TS	Appropriate touchscreen support is enabled.
		UMS	USB Mass Storage support is enabled.
		USB	USB support is enabled.
		USBHID	USB Human Interface Device support is enabled.
		V4L	Video For Linux support is enabled.
		VGA	The VGA console has been enabled.
		VT	Virtual terminal support is enabled.
		WDT	Watchdog support is enabled.
		XT	IBM PC/XT MFM hard disk support is enabled.
		X86-32	X86-32, aka i386 architecture is enabled.
		X86-64	X86-64 architecture is enabled.
				More X86-64 boot options can be found in
				Documentation/x86/x86_64/boot-options.txt .
		X86	Either 32bit or 64bit x86 (same as X86-32+X86-64)
	
	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
	need or coordination with <Documentation/x86/boot.txt>.
	
	There are also arch-specific kernel-parameters not documented here.
	See for example <Documentation/x86/x86_64/boot-options.txt>.
	
	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.
	
	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.
	
	
		acpi=		[HW,ACPI,X86]
				Advanced Configuration and Power Interface
				Format: { force | off | ht | strict | noirq | rsdt }
				force -- enable ACPI if default was off
				off -- disable ACPI if default was on
				noirq -- do not use ACPI for IRQ routing
				ht -- run only enough ACPI to enable Hyper Threading
				strict -- Be less tolerant of platforms that are not
					strictly ACPI specification compliant.
				rsdt -- prefer RSDT over (default) XSDT
	
				See also Documentation/power/pm.txt, pci=noacpi
	
		acpi_apic_instance=	[ACPI, IOAPIC]
				Format: <int>
				2: use 2nd APIC table, if available
				1,0: use 1st APIC table
				default: 0
	
		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.
	
		acpi.debug_layer=	[HW,ACPI,ACPI_DEBUG]
		acpi.debug_level=	[HW,ACPI,ACPI_DEBUG]
				Format: <int>
				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, ...
				The debug_level mask defaults to "info".  See
				Documentation/acpi/debug.txt for more information about
				debug layers and levels.
	
				Enable processor driver info messages:
				    acpi.debug_layer=0x20000000
				Enable PCI/PCI interrupt routing info messages:
				    acpi.debug_layer=0x400000
				Enable AML "Debug" output, i.e., stores to the Debug
				object while interpreting AML:
				    acpi.debug_layer=0xffffffff acpi.debug_level=0x2
				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.
	
		acpi_display_output=	[HW,ACPI]
				acpi_display_output=vendor
				acpi_display_output=video
				See above.
	
		acpi_irq_balance [HW,ACPI]
				ACPI will balance active IRQs
				default in APIC mode
	
		acpi_irq_nobalance [HW,ACPI]
				ACPI will not move active IRQs (default)
				default in PIC mode
	
		acpi_irq_isa=	[HW,ACPI] If irq_balance, mark listed IRQs used by ISA
				Format: <irq>,<irq>...
	
		acpi_irq_pci=	[HW,ACPI] If irq_balance, clear listed IRQs for
				use by PCI
				Format: <irq>,<irq>...
	
		acpi_no_auto_ssdt	[HW,ACPI] Disable automatic loading of SSDT
	
		acpi_os_name=	[HW,ACPI] Tell ACPI BIOS the name of the OS
				Format: To spoof as Windows 98: ="Microsoft Windows"
	
		acpi_osi=	[HW,ACPI] Modify list of supported OS interface strings
				acpi_osi="string1"	# add string1 -- only one string
				acpi_osi="!string2"	# remove built-in string2
				acpi_osi=		# disable all strings
	
		acpi_pm_good	[X86]
				Override the pmtimer bug detection: force the kernel
				to assume that this machine's pmtimer latches its value
				and always returns good values.
	
		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,
					  old_ordering, s4_nonvs }
				See Documentation/power/video.txt for information on
				s3_bios and s3_mode.
				s3_beep is for debugging; it makes the PC's speaker beep
				as soon as the kernel's real-mode entry point is called.
				s4_nohwsig prevents ACPI hardware signature from being
				used during resume from hibernation.
				old_ordering causes the ACPI 1.0 ordering of the _PTS
				control method, with respect to putting devices into
				low power states, to be enforced (the ACPI 2.0 ordering
				of _PTS is used by default).
				s4_nonvs prevents the kernel from saving/restoring the
				ACPI NVS memory during hibernation.
	
		acpi_use_timer_override [HW,ACPI]
				Use timer override. For some broken Nvidia NF5 boards
				that require a timer override, but don't have HPET
	
		acpi_enforce_resources=	[ACPI]
				{ strict | lax | no }
				Check for resource conflicts between native drivers
				and ACPI OperationRegions (SystemIO and SystemMemory
				only). IO ports and memory declared in ACPI might be
				used by the ACPI subsystem in arbitrary AML code and
				can interfere with legacy drivers.
				strict (default): access to resources claimed by ACPI
				is denied; legacy drivers trying to access reserved
				resources will fail to bind to device using them.
				lax: access to resources claimed by ACPI is allowed;
				legacy drivers trying to access reserved resources
				will bind successfully but a warning message is logged.
				no: ACPI OperationRegions are not marked as reserved,
				no further checks are performed.
	
		ad1848=		[HW,OSS]
				Format: <io>,<irq>,<dma>,<dma2>,<type>
	
		add_efi_memmap	[EFI; X86] Include EFI memory map in
				kernel's map of available physical RAM.
	
		advansys=	[HW,SCSI]
				See header of drivers/scsi/advansys.c.
	
		advwdt=		[HW,WDT] Advantech WDT
				Format: <iostart>,<iostop>
	
		aedsp16=	[HW,OSS] Audio Excel DSP 16
				Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
				See also header of sound/oss/aedsp16.c.
	
		agp=		[AGP]
				{ off | try_unsupported }
				off: disable AGP support
				try_unsupported: try to drive unsupported chipsets
					(may crash computer or cause data corruption)
	
		aha152x=	[HW,SCSI]
				See Documentation/scsi/aha152x.txt.
	
		aha1542=	[HW,SCSI]
				Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
	
		aic7xxx=	[HW,SCSI]
				See Documentation/scsi/aic7xxx.txt.
	
		aic79xx=	[HW,SCSI]
				See Documentation/scsi/aic79xx.txt.
	
		amd_iommu=	[HW,X86-84]
				Pass parameters to the AMD IOMMU driver in the system.
				Possible values are:
				isolate - enable device isolation (each device, as far
				          as possible, will get its own protection
				          domain) [default]
				share - put every device behind one IOMMU into the
					same protection domain
				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
	
		amijoy.map=	[HW,JOY] Amiga joystick support
				Map of devices attached to JOY0DAT and JOY1DAT
				Format: <a>,<b>
				See also Documentation/kernel/input/joystick.txt
	
		analog.map=	[HW,JOY] Analog joystick and gamepad support
				Specifies type or capabilities of an analog joystick
				connected to one of 16 gameports
				Format: <type1>,<type2>,..<type16>
	
		apc=		[HW,SPARC]
				Power management functions (SPARCstation-4/5 + deriv.)
				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.
	
		apic=		[APIC,X86-32] Advanced Programmable Interrupt Controller
				Change the output verbosity whilst booting
				Format: { quiet (default) | verbose | debug }
				Change the amount of debugging information output
				when initialising the APIC and IO-APIC components.
	
		apm=		[APM] Advanced Power Management
				See header of arch/x86/kernel/apm_32.c.
	
		arcrimi=	[HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
				Format: <io>,<irq>,<nodeID>
	
		ataflop=	[HW,M68k]
	
		atarimouse=	[HW,MOUSE] Atari Mouse
	
		atascsi=	[HW,SCSI] Atari SCSI
	
		atkbd.extra=	[HW] Enable extra LEDs and keys on IBM RapidAccess,
				EzKey and similar keyboards
	
		atkbd.reset=	[HW] Reset keyboard during initialization
	
		atkbd.set=	[HW] Select keyboard code set
				Format: <int> (2 = AT (default), 3 = PS/2)
	
		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))
	
		atkbd.softrepeat= [HW]
				Use software keyboard repeat
	
		autotest	[IA64]
	
		baycom_epp=	[HW,AX25]
				Format: <io>,<mode>
	
		baycom_par=	[HW,AX25] BayCom Parallel Port AX.25 Modem
				Format: <io>,<mode>
				See header of drivers/net/hamradio/baycom_par.c.
	
		baycom_ser_fdx=	[HW,AX25]
				BayCom Serial Port AX.25 Modem (Full Duplex Mode)
				Format: <io>,<irq>,<mode>[,<baud>]
				See header of drivers/net/hamradio/baycom_ser_fdx.c.
	
		baycom_ser_hdx=	[HW,AX25]
				BayCom Serial Port AX.25 Modem (Half Duplex Mode)
				Format: <io>,<irq>,<mode>
				See header of drivers/net/hamradio/baycom_ser_hdx.c.
	
		boot_delay=	Milliseconds to delay each printk during boot.
				Values larger than 10 seconds (10000) are changed to
				no delay (0).
				Format: integer
	
		bootmem_debug	[KNL] Enable bootmem allocator debug messages.
	
		bttv.card=	[HW,V4L] bttv (bt848 + bt878 based grabber cards)
		bttv.radio=	Most important insmod options are available as
				kernel args too.
		bttv.pll=	See Documentation/video4linux/bttv/Insmod-options
		bttv.tuner=	and Documentation/video4linux/bttv/CARDLIST
	
		BusLogic=	[HW,SCSI]
				See drivers/scsi/BusLogic.c, comment before function
				BusLogic_ParseDriverOptions().
	
		c101=		[NET] Moxa C101 synchronous serial card
	
		cachesize=	[BUGS=X86-32] Override level 2 CPU cache size detection.
				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.
	
		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.
	
		ccw_timeout_log [S390]
				See Documentation/s390/CommonIO for details.
	
		cgroup_disable= [KNL] Disable a particular controller
				Format: {name of the controller(s) to disable}
					{Currently supported controllers - "memory"}
	
		checkreqprot	[SELINUX] Set initial checkreqprot flag value.
				Format: { "0" | "1" }
				See security/selinux/Kconfig help text.
				0 -- check protection applied by kernel (includes
					any implied execute protection).
				1 -- check protection requested by application.
				Default value is set via a kernel config option.
				Value can be changed at runtime via
					/selinux/checkreqprot.
	
		cio_ignore=	[S390]
				See Documentation/s390/CommonIO for details.
	
		clock=		[BUGS=X86-32, HW] gettimeofday clocksource override.
				[Deprecated]
				Forces specified clocksource (if available) to be used
				when calculating gettimeofday(). If specified
				clocksource is not available, it defaults to PIT.
				Format: { pit | tsc | cyclone | pmtmr }
	
		clocksource=	[GENERIC_TIME] Override the default clocksource
				Format: <string>
				Override the default clocksource and use the clocksource
				with the name specified.
				Some clocksource names to choose from, depending on
				the platform:
				[all] jiffies (this is the base, fallback clocksource)
				[ACPI] acpi_pm
				[ARM] imx_timer1,OSTS,netx_timer,mpu_timer2,
					pxa_timer,timer3,32k_counter,timer0_1
				[AVR32] avr32
				[X86-32] pit,hpet,tsc,vmi-timer;
					scx200_hrt on Geode; cyclone on IBM x440
				[MIPS] MIPS
				[PARISC] cr16
				[S390] tod
				[SH] SuperH
				[SPARC64] tick
				[X86-64] hpet,tsc
	
		clearcpuid=BITNUM [X86]
				Disable CPUID feature X for the kernel. See
				arch/x86/include/asm/cpufeature.h for the valid bit
				numbers. Note the Linux specific bits are not necessarily
				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.
	
		cmo_free_hint=	[PPC] Format: { yes | no }
				Specify whether pages are marked as being inactive
				when they are freed.  This is used in CMO environments
				to determine OS memory pressure for page stealing by
				a hypervisor.
				Default: yes
	
		code_bytes	[X86] How many bytes of object code to print
				in an oops report.
				Range: 0 - 8192
				Default: 64
	
		com20020=	[HW,NET] ARCnet - COM20020 chipset
				Format:
				<io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
	
		com90io=	[HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
				Format: <io>[,<irq>]
	
		com90xx=	[HW,NET]
				ARCnet - COM90xx chipset (memory-mapped buffers)
				Format: <io>[,<irq>[,<memstart>]]
	
		condev=		[HW,S390] console device
		conmode=
	
		console=	[KNL] Output console device and options.
	
			tty<n>	Use the virtual console device <n>.
	
			ttyS<n>[,options]
			ttyUSB0[,options]
				Use the specified serial port.  The options are of
				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.
	
			uart[8250],io,<addr>[,options]
			uart[8250],mmio,<addr>[,options]
				Start an early, polled-mode console on the 8250/16550
				UART at the specified I/O port or MMIO address,
				switching to the matching ttyS device later.  The
				options are the same as for ttyS, above.
	
	                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.
	
		consoleblank=	[KNL] The console blank (screen saver) timeout in
				seconds. Defaults to 10*60 = 10mins. A value of 0
				disables the blank timer.
	
		coredump_filter=
				[KNL] Change the default value for
				/proc/<pid>/coredump_filter.
				See also Documentation/filesystems/proc.txt.
	
		cpcihp_generic=	[HW,PCI] Generic port I/O CompactPCI driver
				Format:
				<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
	
		crashkernel=nn[KMG]@ss[KMG]
				[KNL] Reserve a chunk of physical memory to
				hold a kernel to switch to with kexec on panic.
	
		crashkernel=range1:size1[,range2:size2,...][@offset]
				[KNL] Same as above, but depends on the memory
				in the running system. The syntax of range is
				start-[end] where start and end are both
				a memory unit (amount[KMG]). See also
				Documentation/kdump/kdump.txt for a example.
	
		cs89x0_dma=	[HW,NET]
				Format: <dma>
	
		cs89x0_media=	[HW,NET]
				Format: { rj45 | aui | bnc }
	
		dasd=		[HW,NET]
				See header of drivers/s390/block/dasd_devmap.c.
	
		db9.dev[2|3]=	[HW,JOY] Multisystem joystick support via parallel port
				(one device per port)
				Format: <port#>,<type>
				See also Documentation/input/joystick-parport.txt
	
		debug		[KNL] Enable kernel debugging (events log level).
	
		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.
	
		debug_objects	[KNL] Enable object debugging
	
		no_debug_objects
				[KNL] Disable object debugging
	
		debugpat	[X86] Enable PAT debugging
	
		decnet.addr=	[HW,NET]
				Format: <area>[,<node>]
				See also Documentation/networking/decnet.txt.
	
		default_hugepagesz=
				[same as hugepagesz=] The size of the default
				HugeTLB page size. This is the size represented by
				the legacy /proc/ hugepages APIs, used for SHM, and
				default size when mounting hugetlbfs filesystems.
				Defaults to the default architecture's huge page size
				if not specified.
	
		dhash_entries=	[KNL]
				Set number of hash buckets for dentry cache.
	
		digi=		[HW,SERIAL]
				IO parameters + enable/disable command.
	
		digiepca=	[HW,SERIAL]
				See drivers/char/README.epca and
				Documentation/serial/digiepca.txt.
	
		disable_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 disables that.
	
		disable_mtrr_trim [X86, Intel and AMD only]
				By default the kernel will trim any uncacheable
				memory out of your available memory pool based on
				MTRR settings.  This parameter disables that behavior,
				possibly causing your machine to run very slowly.
	
		disable_timer_pin_1 [X86]
				Disable PIN 1 of APIC timer
				Can be useful to work around chipset bugs.
	
		dmasound=	[HW,OSS] Sound subsystem buffers
	
		dma_debug=off	If the kernel is compiled with DMA_API_DEBUG support,
				this option disables the debugging code at boot.
	
		dma_debug_entries=<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.
	
		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.
	
		dscc4.setup=	[NET]
	
		dtc3181e=	[HW,SCSI]
	
		dynamic_printk	Enables pr_debug()/dev_dbg() calls if
				CONFIG_DYNAMIC_PRINTK_DEBUG has been enabled.
				These can also be switched on/off via
				<debugfs>/dynamic_printk/modules
	
		earlycon=	[KNL] Output early console device and options.
			uart[8250],io,<addr>[,options]
			uart[8250],mmio,<addr>[,options]
				Start an early, polled-mode console on the 8250/16550
				UART at the specified I/O port or MMIO address.
				The options are the same as for ttyS, above.
	
		earlyprintk=	[X86,SH,BLACKFIN]
				earlyprintk=vga
				earlyprintk=serial[,ttySn[,baudrate]]
				earlyprintk=ttySn[,baudrate]
				earlyprintk=dbgp[debugController#]
	
				Append ",keep" to not disable it when the real console
				takes over.
	
				Only vga or serial or usb debug port at a time.
	
				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.
	
		eata=		[HW,SCSI]
	
		edd=		[EDD]
				Format: {"off" | "on" | "skip[mbr]"}
	
		eisa_irq_edge=	[PARISC,HW]
				See header of drivers/parisc/eisa.c.
	
		elanfreq=	[X86-32]
				See comment before function elanfreq_setup() in
				arch/x86/kernel/cpu/cpufreq/elanfreq.c.
	
		elevator=	[IOSCHED]
				Format: {"anticipatory" | "cfq" | "deadline" | "noop"}
				See Documentation/block/as-iosched.txt and
				Documentation/block/deadline-iosched.txt for details.
	
		elfcorehdr=	[IA64,PPC,SH,X86]
				Specifies physical address of start of kernel core
				image elf header. Generally kexec loader will
				pass this option to capture kernel.
				See Documentation/kdump/kdump.txt for details.
	
		enable_mtrr_cleanup [X86]
				The kernel tries to adjust MTRR layout from continuous
				to discrete, to make X server driver able to add WB
				entry later. This parameter enables that.
	
		enable_timer_pin_1 [X86]
				Enable PIN 1 of APIC timer
				Can be useful to work around chipset bugs
				(in particular on some ATI chipsets).
				The kernel tries to set a reasonable default.
	
		enforcing	[SELINUX] Set initial enforcing status.
				Format: {"0" | "1"}
				See security/selinux/Kconfig help text.
				0 -- permissive (log only, no denials).
				1 -- enforcing (deny and log).
				Default value is 0.
				Value can be changed at runtime via /selinux/enforce.
	
		ether=		[HW,NET] Ethernet cards parameters
				This option is obsoleted by the "netdev=" option, which
				has equivalent usage. See its documentation for details.
	
		eurwdt=		[HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
				Format: <io>[,<irq>]
	
		failslab=
		fail_page_alloc=
		fail_make_request=[KNL]
				General fault injection mechanism.
				Format: <interval>,<probability>,<space>,<times>
				See also /Documentation/fault-injection/.
	
		fd_mcs=		[HW,SCSI]
				See header of drivers/scsi/fd_mcs.c.
	
		fdomain=	[HW,SCSI]
				See header of drivers/scsi/fdomain.c.
	
		floppy=		[HW]
				See Documentation/blockdev/floppy.txt.
	
		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.
	
		ftrace=[tracer]
				[FTRACE] will set and start the specified tracer
				as early as possible in order to facilitate early
				boot debugging.
	
		ftrace_dump_on_oops
				[FTRACE] will dump the trace buffers on oops.
	
		ftrace_filter=[function-list]
				[FTRACE] Limit the functions traced by the function
				tracer at boot up. function-list is a comma separated
				list of functions. This list can be changed at run
				time by the set_ftrace_filter file in the debugfs
				tracing directory. 
	
		ftrace_notrace=[function-list]
				[FTRACE] Do not trace the functions specified in
				function-list. This list can be changed at run time
				by the set_ftrace_notrace file in the debugfs
				tracing directory.
	
		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]
	
		gart_fix_e820=  [X86_64] disable the fix e820 for K8 GART
				Format: off | on
				default: on
	
		gcov_persist=	[GCOV] When non-zero (default), profiling data for
				kernel modules is saved and remains accessible via
				debugfs, even when the module is unloaded/reloaded.
				When zero, profiling data is discarded and associated
				debugfs files are removed at module unload time.
	
		gdth=		[HW,SCSI]
				See header of drivers/scsi/gdth.c.
	
		gpt		[EFI] Forces disk with valid GPT signature but
				invalid Protective MBR to be treated as GPT.
	
		gvp11=		[HW,SCSI]
	
		hashdist=	[KNL,NUMA] Large hashes allocated during boot
				are distributed across NUMA nodes.  Defaults on
				for 64bit NUMA, off otherwise.
				Format: 0 | 1 (for off | on)
	
		hcl=		[IA-64] SGI's Hardware Graph compatibility layer
	
		hd=		[EIDE] (E)IDE hard drive subsystem geometry
				Format: <cyl>,<head>,<sect>
	
		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.
	
		highres=	[KNL] Enable/disable high resolution timer mode.
				Valid parameters: "on", "off"
				Default: "on"
	
		hisax=		[HW,ISDN]
				See Documentation/isdn/README.HiSax.
	
		hlt		[BUGS=ARM,SH]
	
		hpet=		[X86-32,HPET] option to control HPET usage
				Format: { enable (default) | disable | force |
					verbose }
				disable: disable HPET and use PIT instead
				force: allow force enabled of undocumented chips (ICH4,
					VIA, nVidia)
				verbose: show contents of HPET registers during setup
	
		hugepages=	[HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
		hugepagesz=	[HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
				On x86-64 and powerpc, this option can be specified
				multiple times interleaved with hugepages= to reserve
				huge pages of different sizes. Valid pages sizes on
				x86-64 are 2M (when the CPU supports "pse") and 1G
				(when the CPU supports the "pdpe1gb" cpuinfo flag)
				Note that 1GB pages can only be allocated at boot time
				using hugepages= and not freed afterwards.
	
		hvc_iucv=	[S390] Number of z/VM IUCV hypervisor console (HVC)
				       terminal devices. Valid values: 0..8
		hvc_iucv_allow=	[S390] Comma-separated list of z/VM user IDs.
				       If specified, z/VM IUCV HVC accepts connections
				       from listed z/VM user IDs only.
	
		i2c_bus=	[HW] Override the default board specific I2C bus speed
				     or register an additional I2C bus that is not
				     registered from board initialization code.
				     Format:
				     <bus_id>,<clkrate>
	
		i8042.debug	[HW] Toggle i8042 debug mode
		i8042.direct	[HW] Put keyboard port into non-translated mode
		i8042.dumbkbd	[HW] Pretend that controller can only read data from
				     keyboard and cannot control its state
				     (Don't attempt to blink the leds)
		i8042.noaux	[HW] Don't check for auxiliary (== mouse) port
		i8042.nokbd	[HW] Don't check/create keyboard port
		i8042.noloop	[HW] Disable the AUX Loopback command while probing
				     for the AUX port
		i8042.nomux	[HW] Don't check presence of an active multiplexing
				     controller
		i8042.nopnp	[HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX
				     controllers
		i8042.panicblink=
				[HW] Frequency with which keyboard LEDs should blink
				     when kernel panics (default is 0.5 sec)
		i8042.reset	[HW] Reset the controller during init and cleanup
		i8042.unlock	[HW] Unlock (ignore) the keylock
	
		i810=		[HW,DRM]
	
		i8k.ignore_dmi	[HW] Continue probing hardware even if DMI data
				indicates that the driver is running on unsupported
				hardware.
		i8k.force	[HW] Activate i8k driver even if SMM BIOS signature
				does not match list of supported models.
		i8k.power_status
				[HW] Report power status in /proc/i8k
				(disabled by default)
		i8k.restricted	[HW] Allow controlling fans only if SYS_ADMIN
				capability is set.
	
		ibmmcascsi=	[HW,MCA,SCSI] IBM MicroChannel SCSI adapter
				See Documentation/mca.txt.
	
		icn=		[HW,ISDN]
				Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
	
		ide-core.nodma=	[HW] (E)IDE subsystem
				Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc
				.vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr
				.cdrom .chs .ignore_cable are additional options
				See Documentation/ide/ide.txt.
	
		ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
				Claim all unknown PCI IDE storage controllers.
	
		idle=		[X86]
				Format: idle=poll, idle=mwait, idle=halt, idle=nomwait
				Poll forces a polling idle loop that can slightly
				improve the performance of waking up a idle CPU, but
				will use a lot of power and make the system run hot.
				Not recommended.
				idle=mwait: On systems which support MONITOR/MWAIT but
				the kernel chose to not use it because it doesn't save
				as much power as a normal idle loop, use the
				MONITOR/MWAIT idle loop anyways. Performance should be
				the same as idle=poll.
				idle=halt: Halt is forced to be used for CPU idle.
				In such case C2/C3 won't be used again.
				idle=nomwait: Disable mwait for CPU C-states
	
		ignore_loglevel	[KNL]
				Ignore loglevel setting - this will print /all/
				kernel messages to the console. Useful for debugging.
	
		ihash_entries=	[KNL]
				Set number of hash buckets for inode cache.
	
		ima_audit=	[IMA]
				Format: { "0" | "1" }
				0 -- integrity auditing messages. (Default)
				1 -- enable informational integrity auditing messages.
	
		ima_hash=	[IMA]
				Format: { "sha1" | "md5" }
				default: "sha1"
	
		ima_tcb		[IMA]
				Load a policy which meets the needs of the Trusted
				Computing Base.  This means IMA will measure all
				programs exec'd, files mmap'd for exec, and all files
				opened for read by uid=0.
	
		in2000=		[HW,SCSI]
				See header of drivers/scsi/in2000.c.
	
		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>
	
		intel_iommu=	[DMAR] Intel IOMMU driver (DMAR) option
			on
				Enable intel iommu driver.
			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.
			forcedac [x86_64]
				With this option iommu will not optimize to look
				for io virtual address below 32 bit forcing dual
				address cycle on pci bus for cards supporting greater
				than 32 bit addressing. The default is to look
				for translation below 32 bit and if not available
				then look in the higher range.
			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.
	
		inttest=	[IA64]
	
		iomem=		Disable strict checking of access to MMIO memory
			strict	regions from userspace.
			relaxed
	
		iommu=		[x86]
			off
			force
			noforce
			biomerge
			panic
			nopanic
			merge
			nomerge
			forcesac
			soft
			pt	[x86, IA64]
	
		io7=		[HW] IO7 for Marvel based alpha systems
				See comment before marvel_specify_io7 in
				arch/alpha/kernel/core_marvel.c.
	
		io_delay=	[X86] I/O delay method
			0x80
				Standard port 0x80 based delay
			0xed
				Alternate port 0xed based delay (needed on some systems)
			udelay
				Simple two microseconds delay
			none
				No delay
	
		ip=		[IP_PNP]
				See Documentation/filesystems/nfsroot.txt.
	
		ip2=		[HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
				See comment before ip2_setup() in
				drivers/char/ip2/ip2base.c.
	
		ips=		[HW,SCSI] Adaptec / IBM ServeRAID controller
				See header of drivers/scsi/ips.c.
	
		irqfixup	[HW]
				When an interrupt is not handled search all handlers
				for it. Intended to get systems with badly broken
				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.
	
		isapnp=		[ISAPNP]
				Format: <RDP>,<reset>,<pci_scan>,<verbosity>
	
		isolcpus=	[KNL,SMP] Isolate CPUs from the general scheduler.
				Format:
				<cpu number>,...,<cpu number>
				or
				<cpu number>-<cpu number>
				(must be a positive range in ascending order)
				or a mixture
				<cpu number>,...,<cpu number>-<cpu number>
	
				This option can be used to specify one or more CPUs
				to isolate from the general SMP balancing and scheduling
				algorithms. You can move a process onto or off an
				"isolated" CPU via the CPU affinity syscalls or cpuset.
				<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
				alternative -- manually setting the CPU mask of all
				tasks in the system -- can cause problems and
				suboptimal load balancer performance.
	
		iucv=		[HW,NET]
	
		js=		[HW,JOY] Analog joystick
				See Documentation/input/joystick.txt.
	
		keepinitrd	[HW,ARM]
	
		kernelcore=nn[KMG]	[KNL,X86,IA-64,PPC] This parameter
				specifies the amount of memory usable by the kernel
				for non-movable allocations.  The requested amount is
				spread evenly throughout all nodes in the system. The
				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.
	
		kgdboc=		[HW] kgdb over consoles.
				Requires a tty driver that supports console polling.
				(only serial supported for now)
				Format: <serial_device>[,baud]
	
		kmac=		[MIPS] korina ethernet MAC address.
				Configure the RouterBoard 532 series on-chip
				Ethernet adapter MAC address.
	
		kmemleak=	[KNL] Boot-time kmemleak enable/disable
				Valid arguments: on, off
				Default: on
	
		kstack=N	[X86] Print N words from the kernel stack
				in oops dumps.
	
		kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs.
				Default is 0 (don't ignore, but inject #GP)
	
		kvm.oos_shadow=	[KVM] Disable out-of-sync shadow paging.
				Default is 1 (enabled)
	
		kvm-amd.nested=	[KVM,AMD] Allow nested virtualization in KVM/SVM.
				Default is 0 (off)
	
		kvm-amd.npt=	[KVM,AMD] Disable nested paging (virtualized MMU)
				for all guests.
				Default is 1 (enabled) if in 64bit or 32bit-PAE mode
	
		kvm-intel.bypass_guest_pf=
				[KVM,Intel] Disables bypassing of guest page faults
				on Intel chips. Default is 1 (enabled)
	
		kvm-intel.ept=	[KVM,Intel] Disable extended page tables
				(virtualized MMU) support on capable Intel chips.
				Default is 1 (enabled)
	
		kvm-intel.emulate_invalid_guest_state=
				[KVM,Intel] Enable emulation of invalid guest states
				Default is 0 (disabled)
	
		kvm-intel.flexpriority=
				[KVM,Intel] Disable FlexPriority feature (TPR shadow).
				Default is 1 (enabled)
	
		kvm-intel.unrestricted_guest=
				[KVM,Intel] Disable unrestricted guest feature
				(virtualized real and unpaged mode) on capable
				Intel chips. Default is 1 (enabled)
	
		kvm-intel.vpid=	[KVM,Intel] Disable Virtual Processor Identification
				feature (tagged TLBs) on capable Intel chips.
				Default is 1 (enabled)
	
		l2cr=		[PPC]
	
		l3cr=		[PPC]
	
		lapic		[X86-32,APIC] Enable the local APIC even if BIOS
				disabled it.
	
		lapic_timer_c2_ok	[X86,APIC] trust the local apic timer
				in C2 power state.
	
		libata.dma=	[LIBATA] DMA control
				libata.dma=0	  Disable all PATA and SATA DMA
				libata.dma=1	  PATA and SATA Disk DMA only
				libata.dma=2	  ATAPI (CDROM) DMA only
				libata.dma=4	  Compact Flash DMA only 
				Combinations also work, so libata.dma=3 enables DMA
				for disks and CDROMs, but not CFs.
		
		libata.ignore_hpa=	[LIBATA] Ignore HPA limit
				libata.ignore_hpa=0	  keep BIOS limits (default)
				libata.ignore_hpa=1	  ignore limits, using full disk
	
		libata.noacpi	[LIBATA] Disables use of ACPI in libata suspend/resume
				when set.
				Format: <int>
	
		libata.force=	[LIBATA] Force configurations.  The format is comma
				separated list of "[ID:]VAL" where ID is
				PORT[:DEVICE].  PORT and DEVICE are decimal numbers
				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.
	
				* nohrst, nosrst, norst: suppress hard, soft
	                          and both resets.
	
				If there are multiple matching configurations changing
				the same attribute, the last one is used.
	
		lmb=debug	[KNL] Enable lmb debug messages.
	
		load_ramdisk=	[RAM] List of ramdisks to load from floppy
				See Documentation/blockdev/ramdisk.txt.
	
		lockd.nlm_grace_period=P  [NFS] Assign grace period.
				Format: <integer>
	
		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>
	
		logibm.irq=	[HW,MOUSE] Logitech Bus Mouse Driver
				Format: <irq>
	
		loglevel=	All Kernel Messages with a loglevel smaller than the
				console loglevel will be printed to the console. It can
				also be changed with klogd or other programs. The
				loglevels are defined as follows:
	
				0 (KERN_EMERG)		system is unusable
				1 (KERN_ALERT)		action must be taken immediately
				2 (KERN_CRIT)		critical conditions
				3 (KERN_ERR)		error conditions
				4 (KERN_WARNING)	warning conditions
				5 (KERN_NOTICE)		normal but significant condition
				6 (KERN_INFO)		informational
				7 (KERN_DEBUG)		debug-level messages
	
		log_buf_len=n	Sets the size of the printk ring buffer, in bytes.
				Format: { n | nk | nM }
				n must be a power of two.  The default size
				is set in the kernel config file.
	
		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.
	
		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>
	
		mac5380=	[HW,SCSI] Format:
				<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
	
		machvec=	[IA64] Force the use of a particular machine-vector
				(machvec) in a generic kernel.
				Example: machvec=hpzx1_swiotlb
	
		machtype=	[Loongson] Share the same kernel image file between different
				 yeeloong laptop.
				Example: machtype=lemote-yeeloong-2f-7inch
	
		max_addr=nn[KMG]	[KNL,BOOT,ia64] All physical memory greater
				than or equal to this physical address is ignored.
	
		maxcpus=	[SMP] Maximum number of processors that	an SMP kernel
				should make use of.  maxcpus=n : n >= 0 limits the
				kernel to using 'n' processors.  n=0 is a special case,
				it is equivalent to "nosmp", which also disables
				the IO APIC.
	
		max_loop=	[LOOP] Maximum number of loopback devices that can
				be mounted
				Format: <1-256>
	
		max_luns=	[SCSI] Maximum number of LUNs to probe.
				Should be between 1 and 2^32-1.
	
		max_report_luns=
				[SCSI] Maximum number of LUNs received.
				Should be between 1 and 16384.
	
		mcatest=	[IA-64]
	
		mce		[X86-32] Machine Check Exception
	
		mce=option	[X86-64] See Documentation/x86/x86_64/boot-options.txt
	
		md=		[HW] RAID subsystems devices and level
				See Documentation/md.txt.
	
		mdacon=		[MDA]
				Format: <first>,<last>
				Specifies range of consoles to be captured by the MDA.
	
		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.
				[X86-32] Use together with memmap= to avoid physical
				address space collisions. Without memmap= PCI devices
				could be placed at addresses belonging to unused RAM.
	
		mem=nopentium	[BUGS=X86-32] Disable usage of 4MB pages for kernel
				memory.
	
		memchunk=nn[KMG]
				[KNL,SH] Allow user to override the default size for
				per-device physically contiguous DMA buffers.
	
		memmap=exactmap	[KNL,X86] Enable setting of an exact
				E820 memory map, as specified by the user.
				Such memmap=exactmap lines can be constructed based on
				BIOS output or other requirements. See the memmap=nn@ss
				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.
				Example: Exclude memory from 0x18690000-0x1869ffff
				         memmap=64K$0x18690000
				         or
				         memmap=0x10000$0x18690000
	
		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.
	
		memtest=	[KNL,X86] Enable memtest
				Format: <integer>
				default : 0 <disable>
				Specifies the number of memtest passes to be
				performed. Each pass selects another test
				pattern from a given set of patterns. Memtest
				fills the memory with this pattern, validates
				memory contents and reserves bad memory
				regions that are detected.
	
		meye.*=		[HW] Set MotionEye Camera parameters
				See Documentation/video4linux/meye.txt.
	
		mfgpt_irq=	[IA-32] Specify the IRQ to use for the
				Multi-Function General Purpose Timers on AMD Geode
				platforms.
	
		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.
	
		mga=		[HW,DRM]
	
		min_addr=nn[KMG]	[KNL,BOOT,ia64] All physical memory below this
				physical address is ignored.
	
		mini2440=	[ARM,HW,KNL]
				Format:[0..2][b][c][t]
				Default: "0tb"
				MINI2440 configuration specification:
				0 - The attached screen is the 3.5" TFT
				1 - The attached screen is the 7" TFT
				2 - The VGA Shield is attached (1024x768)
				Leaving out the screen size parameter will not load
				the TFT driver, and the framebuffer will be left
				unconfigured.
				b - Enable backlight. The TFT backlight pin will be
				linked to the kernel VESA blanking code and a GPIO
				LED. This parameter is not necessary when using the
				VGA shield.
				c - Enable the s3c camera interface.
				t - Reserved for enabling touchscreen support. The
				touchscreen support is not enabled in the mainstream
				kernel as of 2.6.30, a preliminary port can be found
				in the "bleeding edge" mini2440 support kernel at
				http://repo.or.cz/w/linux-2.6/mini2440.git
	
		mminit_loglevel=
				[KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
				parameter allows control of the logging verbosity for
				the additional memory initialisation checks. A value
				of 0 disables mminit logging and a level of 4 will
				log everything. Information is printed at KERN_DEBUG
				so loglevel=8 may also need to be specified.
	
		mousedev.tap_time=
				[MOUSE] Maximum time between finger touching and
				leaving touchpad surface for touch to be considered
				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
	
		movablecore=nn[KMG]	[KNL,X86,IA-64,PPC] This parameter
				is similar to kernelcore except it specifies the
				amount of memory used for migratable allocations.
				If both kernelcore and movablecore is specified,
				then kernelcore will be at *least* the specified
				value but may be more. If movablecore on its own
				is specified, the administrator must be careful
				that the amount of memory usable for all allocations
				is not too small.
	
		mpu401=		[HW,OSS]
				Format: <io>,<irq>
	
		MTD_Partition=	[MTD]
				Format: <name>,<region-number>,<size>,<offset>
	
		MTD_Region=	[MTD] Format:
				<name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
	
		mtdparts=	[MTD]
				See drivers/mtd/cmdlinepart.c.
	
		onenand.bdry=	[HW,MTD] Flex-OneNAND Boundary Configuration
	
				Format: [die0_boundary][,die0_lock][,die1_boundary][,die1_lock]
	
				boundary - index of last SLC block on Flex-OneNAND.
					   The remaining blocks are configured as MLC blocks.
				lock	 - Configure if Flex-OneNAND boundary should be locked.
					   Once locked, the boundary cannot be changed.
					   1 indicates lock status, 0 indicates unlock status.
	
		mtdset=		[ARM]
				ARM/S3C2412 JIVE boot control
	
				See arch/arm/mach-s3c2412/mach-jive.c
	
		mtouchusb.raw_coordinates=
				[HW] Make the MicroTouch USB driver use raw coordinates
				('y', default) or cooked coordinates ('n')
	
		mtrr_chunk_size=nn[KMG] [X86]
				used for mtrr cleanup. It is largest continuous chunk
				that could hold holes aka. UC entries.
	
		mtrr_gran_size=nn[KMG] [X86]
				Used for mtrr cleanup. It is granularity of mtrr block.
				Default is 1.
				Large value could prevent small alignment from
				using up MTRRs.
	
		mtrr_spare_reg_nr=n [X86]
				Format: <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.
	
		n2=		[NET] SDL Inc. RISCom/N2 synchronous serial card
	
		NCR_D700=	[HW,SCSI]
				See header of drivers/scsi/NCR_D700.c.
	
		ncr5380=	[HW,SCSI]
	
		ncr53c400=	[HW,SCSI]
	
		ncr53c400a=	[HW,SCSI]
	
		ncr53c406a=	[HW,SCSI]
	
		ncr53c8xx=	[HW,SCSI]
	
		netdev=		[NET] Network devices parameters
				Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
				Note that mem_start is often overloaded to mean
				something different and driver-specific.
				This usage is only documented in each driver source
				file if at all.
	
		nf_conntrack.acct=
				[NETFILTER] Enable connection tracking flow accounting
				0 to disable accounting
				1 to enable accounting
				Default value depends on CONFIG_NF_CT_ACCT that is
				going to be removed in 2.6.29.
	
		nfsaddrs=	[NFS]
				See Documentation/filesystems/nfsroot.txt.
	
		nfsroot=	[NFS] nfs root filesystem for disk-less boxes.
				See Documentation/filesystems/nfsroot.txt.
	
		nfs.callback_tcpport=
				[NFS] set the TCP port on which the NFSv4 callback
				channel should listen.
	
		nfs.cache_getent=
				[NFS] sets the pathname to the program which is used
				to update the NFS client cache entries.
	
		nfs.cache_getent_timeout=
				[NFS] sets the timeout after which an attempt to
				update a cache entry is deemed to have failed.
	
		nfs.idmap_cache_timeout=
				[NFS] set the maximum lifetime for idmapper cache
				entries.
	
		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.
	
		nmi_debug=	[KNL,AVR32,SH] Specify one or more actions to take
				when a NMI is triggered.
				Format: [state][,regs][,debounce][,die]
	
		nmi_watchdog=	[KNL,BUGS=X86] Debugging features for SMP kernels
				Format: [panic,][num]
				Valid num: 0,1,2
				0 - turn nmi_watchdog off
				1 - use the IO-APIC timer for the NMI watchdog
				2 - use the local APIC for the NMI watchdog using
				a performance counter. Note: This will use one
				performance counter and the local APIC's performance
				vector.
				When panic is specified, panic when an NMI watchdog
				timeout occurs.
				This is useful when you use a panic=... timeout and
				need the box quickly up again.
				Instead of 1 and 2 it is possible to use the following
				symbolic names: lapic and ioapic
				Example: nmi_watchdog=2 or nmi_watchdog=panic,lapic
	
		netpoll.carrier_timeout=
				[NET] Specifies amount of time (in seconds) that
				netpoll should wait for a carrier. By default netpoll
				waits 4 seconds.
	
		no387		[BUGS=X86-32] Tells the kernel to use the 387 maths
				emulation library even if a 387 maths coprocessor
				is present.
	
		no_console_suspend
				[HW] Never suspend the console
				Disable suspending of consoles during suspend and
				hibernate operations.  Once disabled, debugging
				messages can reach various consoles while the rest
				of the system is being put to sleep (ie, while
				debugging driver suspend/resume hooks).  This may
				not work reliably with all consoles, but is known
				to work with serial and VGA consoles.
	
		noaliencache	[MM, NUMA, SLAB] Disables the allocation of alien
				caches in the slab allocator.  Saves per-node memory,
				but will impact performance.
	
		noalign		[KNL,ARM]
	
		noapic		[SMP,APIC] Tells the kernel to not make use of any
				IOAPICs that may be present in the system.
	
		nobats		[PPC] Do not use BATs for mapping kernel lowmem
				on "Classic" PPC cores.
	
		nocache		[ARM]
	
		noclflush	[BUGS=X86] Don't use the CLFLUSH instruction
	
		nodelayacct	[KNL] Disable per-task delay accounting
	
		nodisconnect	[HW,SCSI,M68K] Disables SCSI disconnects.
	
		nodsp		[SH] Disable hardware DSP at boot time.
	
		noefi		[X86] Disable EFI runtime services support.
	
		noexec		[IA-64]
	
		noexec		[X86]
				On X86-32 available only on PAE configured kernels.
				noexec=on: enable non-executable mappings (default)
				noexec=off: disable non-executable mappings
	
		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
	
		nofpu		[SH] Disable hardware FPU at boot time.
	
		nofxsr		[BUGS=X86-32] Disables x86 floating point extended
				register save and restore. The kernel will only save
				legacy floating-point registers on task switch.
	
		noxsave		[BUGS=X86] Disables x86 extended register state save
				and restore using xsave. The kernel will fallback to
				enabling legacy floating-point and sse state.
	
		nohlt		[BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
				wfi(ARM) instruction doesn't work correctly and not to
				use it. This is also useful when using JTAG debugger.
	
		no-hlt		[BUGS=X86-32] Tells the kernel that the hlt
				instruction doesn't work correctly and not to
				use it.
	
		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.
	
		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.
	
		nohz=		[KNL] Boottime enable/disable dynamic ticks
				Valid arguments: on, off
				Default: on
	
		noiotrap	[SH] Disables trapped I/O port accesses.
	
		noirqdebug	[X86-32] Disables the code which attempts to detect and
				disable unhandled interrupt sources.
	
		no_timer_check	[X86,APIC] Disables the code which tests for
				broken timer IRQ sources.
	
		noisapnp	[ISAPNP] Disables ISA PnP code.
	
		noinitrd	[RAM] Tells the kernel not to load any configured
				initial RAM disk.
	
		nointremap	[X86-64, Intel-IOMMU] Do not enable interrupt
				remapping.
	
		nointroute	[IA-64]
	
		nojitter	[IA64] Disables jitter checking for ITC timers.
	
		nolapic		[X86-32,APIC] Do not enable or use the local APIC.
	
		nolapic_timer	[X86-32,APIC] Do not use the local APIC timer.
	
		noltlbs		[PPC] Do not use large page/tlb entries for kernel
				lowmem mapping on PPC40x.
	
		nomca		[IA-64] Disable machine check abort handling
	
		nomce		[X86-32] Machine Check Exception
	
		nomfgpt		[X86-32] Disable Multi-Function General Purpose
				Timer usage (for AMD Geode machines).
	
		norandmaps	Don't use address space randomization.  Equivalent to
				echo 0 > /proc/sys/kernel/randomize_va_space
	
		noreplace-paravirt	[X86-32,PV_OPS] Don't patch paravirt_ops
	
		noreplace-smp	[X86-32,SMP] Don't replace SMP instructions
				with UP alternatives
	
		noresidual	[PPC] Don't use residual data on PReP machines.
	
		noresume	[SWSUSP] Disables resume and restores original swap
				space.
	
		no-scroll	[VGA] Disables scrollback.
				This is required for the Braillex ib80-piezo Braille
				reader made by F.H. Papenmeier (Germany).
	
		nosbagart	[IA-64]
	
		nosep		[BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
	
		nosmp		[SMP] Tells an SMP kernel to act as a UP kernel,
				and disable the IO APIC.  legacy for "maxcpus=0".
	
		nosoftlockup	[KNL] Disable the soft-lockup detector.
	
		noswapaccount	[KNL] Disable accounting of swap in memory resource
				controller. (See Documentation/cgroups/memory.txt)
	
		nosync		[HW,M68K] Disables sync negotiation for all devices.
	
		notsc		[BUGS=X86-32] Disable Time Stamp Counter
	
		nousb		[USB] Disable the USB subsystem
	
		nowb		[ARM]
	
		nox2apic	[X86-64,APIC] Do not enable x2APIC mode.
	
		nptcg=		[IA64] Override max number of concurrent global TLB
				purges which is reported from either PAL_VM_SUMMARY or
				SAL PALO.
	
		nr_uarts=	[SERIAL] maximum number of UARTs to be registered.
	
		numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA.
				one of ['zone', 'node', 'default'] can be specified
				This can be set from sysctl after boot.
				See Documentation/sysctl/vm.txt for details.
	
		ohci1394_dma=early	[HW] enable debugging via the ohci1394 driver.
				See Documentation/debugging-via-ohci1394.txt for more
				info.
	
		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!
	
		opl3=		[HW,OSS]
				Format: <io>
	
		oprofile.timer=	[HW]
				Use timer interrupt instead of performance counters
	
		oprofile.cpu_type=	Force an oprofile cpu type
				This might be useful if you have an older oprofile
				userland or if you want common events.
				Format: { arch_perfmon }
				arch_perfmon: [X86] Force use of architectural
					perfmon on Intel CPUs instead of the
					CPU specific event set.
	
		osst=		[HW,SCSI] SCSI Tape Driver
				Format: <buffer_size>,<write_threshold>
				See also Documentation/scsi/st.txt.
	
		panic=		[KNL] Kernel behaviour on panic
				Format: <timeout>
	
		parkbd.port=	[HW] Parallel port number the keyboard adapter is
				connected to, default is 0.
				Format: <parport#>
		parkbd.mode=	[HW] Parallel port keyboard adapter mode of operation,
				0 for XT, 1 for AT (default is AT).
				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.
				Format: [spp|ps2|epp|ecp|ecpepp]
	
		pas2=		[HW,OSS] Format:
				<io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
	
		pas16=		[HW,SCSI]
				See header of drivers/scsi/pas16.c.
	
		pause_on_oops=
				Halt all CPUs after the first oops has been printed for
				the specified number of seconds.  This is to be used if
				your oopses keep scrolling off the screen.
	
		pcbit=		[HW,ISDN]
	
		pcd.		[PARIDE]
				See header of drivers/block/paride/pcd.c.
				See also Documentation/blockdev/paride.txt.
	
		pci=option[,option...]	[PCI] various PCI subsystem options:
			earlydump	[X86] dump PCI config space before the kernel
				        changes anything
			off		[X86] don't probe for the PCI bus
			bios		[X86-32] force use of PCI BIOS, don't access
					the hardware directly. Use this if your machine
					has a non-standard PCI host bridge.
			nobios		[X86-32] disallow use of PCI BIOS, only direct
					hardware access methods are allowed. Use this
					if you experience crashes upon bootup and you
					suspect they are caused by the BIOS.
			conf1		[X86] Force use of PCI Configuration
					Mechanism 1.
			conf2		[X86] Force use of PCI Configuration
					Mechanism 2.
			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.
			nodomains	[PCI] Disable support for multiple PCI
					root domains (aka PCI segments, in ACPI-speak).
			nommconf	[X86] Disable use of MMCONFIG for PCI
					Configuration
			check_enable_amd_mmconf [X86] check for and enable
					properly configured MMIO access to PCI
					config space on AMD family 10h CPU
			nomsi		[MSI] If the PCI_MSI kernel config parameter is
					enabled, this kernel boot option can be used to
					disable the use of MSI interrupts system-wide.
			noioapicquirk	[APIC] Disable all boot interrupt quirks.
					Safety option to keep boot IRQs enabled. This
					should never be necessary.
			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.
			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.
			biosirq		[X86-32] Use PCI BIOS calls to get the interrupt
					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.
			rom		[X86] Assign address space to expansion ROMs.
					Use with caution as certain devices share
					address decoders between ROMs and other
					resources.
			norom		[X86] Do not assign address space to
					expansion ROMs that do not already have
					BIOS assigned address ranges.
			irqmask=0xMMMM	[X86] Set a bit mask of IRQs allowed to be
					assigned automatically to PCI devices. You can
					make the kernel exclude IRQs of your ISA cards
					this way.
			pirqaddr=0xAAAAA	[X86] Specify the physical address
					of the PIRQ table (normally generated
					by the BIOS) if it is outside the
					F0000h-100000h range.
			lastbus=N	[X86] Scan all buses thru bus #N. Can be
					useful if the kernel is unable to find your
					secondary buses and you want to tell it
					explicitly which ones they are.
			assign-busses	[X86] Always assign all PCI bus
					numbers ourselves, overriding
					whatever the firmware may have done.
			usepirqmask	[X86] Honor the possible IRQ mask stored
					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.
			noacpi		[X86] Do not use ACPI for IRQ routing
					or for PCI scanning.
			use_crs		[X86] Use _CRS for PCI resource
					allocation.
			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.
			skip_isa_align	[X86] do not align io start addr, so can
					handle more pci cards
			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.
			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.
			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.
			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.
			resource_alignment=
					Format:
					[<order of align>[AT]][<domain>:]<bus>:<slot>.<func>[; ..[DOT]]
					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.
			ecrc=		Enable/disable PCIe ECRC (transaction layer
					end-to-end CRC checking).
					bios: Use BIOS/firmware settings. This is the
					the default.
					off: Turn ECRC off
					on: Turn ECRC on.
	
		pcie_aspm=	[PCIE] Forcibly enable or disable PCIe Active State Power
				Management.
			off	Disable ASPM.
			force	Enable ASPM even on devices that claim not to support it.
				WARNING: Forcing ASPM on may cause system lockups.
	
		pcmv=		[HW,PCMCIA] BadgePAD 4
	
		pd.		[PARIDE]
				See Documentation/blockdev/paride.txt.
	
		pdcchassis=	[PARISC,HW] Disable/Enable PDC Chassis Status codes at
				boot time.
				Format: { 0 | 1 }
				See arch/parisc/kernel/pdc_chassis.c
	
		percpu_alloc=	Select which percpu first chunk allocator to use.
				Currently supported values are "embed" and "page".
				Archs may support subset or none of the	selections.
				See comments in mm/percpu.c for details on each
				allocator.  This parameter is primarily	for debugging
				and performance comparison.
	
		pf.		[PARIDE]
				See Documentation/blockdev/paride.txt.
	
		pg.		[PARIDE]
				See Documentation/blockdev/paride.txt.
	
		pirq=		[SMP,APIC] Manual mp-table setup
				See Documentation/x86/i386/IO-APIC.txt.
	
		plip=		[PPT,NET] Parallel port network link
				Format: { parport<nr> | timid | 0 }
				See also Documentation/parport.txt.
	
		pmtmr=		[X86] Manual setup of pmtmr I/O Port. 
				Override pmtimer IOPort with a hex value.
				e.g. pmtmr=0x508
	
		pnp.debug	[PNP]
				Enable PNP debug messages.  This depends on the
				CONFIG_PNP_DEBUG_MESSAGES option.
	
		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
				Ranges are in pairs (I/O port base and size).
	
		pnp_reserve_mem=
				[ISAPNP] Exclude memory regions for the
				autoconfiguration.
				Ranges are in pairs (memory base and size).
	
		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>....
	
		print-fatal-signals=
				[KNL] debug: print fatal signals
				print-fatal-signals=1: print segfault info to
				the kernel console.
				default: off.
	
		printk.time=	Show timing data prefixed to each printk message line
				Format: <bool>  (1/Y/y=enable, 0/N/n=disable)
	
		processor.max_cstate=	[HW,ACPI]
				Limit processor to maximum C-state
				max_cstate=9 overrides any DMI blacklist limit.
	
		processor.nocst	[HW,ACPI]
				Ignore the _CST method to determine C-states,
				instead using the legacy FADT method
	
		profile=	[KNL] Enable kernel profiling via /proc/profile
				Format: [schedule,]<number>
				Param: "schedule" - profile schedule points.
				Param: <number> - step/bucket size as a power of 2 for
					statistical time based profiling.
				Param: "sleep" - profile D-state sleeping (millisecs).
					Requires CONFIG_SCHEDSTATS
				Param: "kvm" - profile VM exits.
	
		prompt_ramdisk=	[RAM] List of RAM disks to prompt for floppy disk
				before loading.
				See Documentation/blockdev/ramdisk.txt.
	
		psmouse.proto=	[HW,MOUSE] Highest PS2 mouse protocol extension to
				probe for; one of (bare|imps|exps|lifebook|any).
		psmouse.rate=	[HW,MOUSE] Set desired mouse report rate, in reports
				per second.
		psmouse.resetafter=	[HW,MOUSE]
				Try to reset the device after so many bad packets
				(0 = never).
		psmouse.resolution=
				[HW,MOUSE] Set desired mouse resolution, in dpi.
		psmouse.smartscroll=
				[HW,MOUSE] Controls Logitech smartscroll autorepeat.
				0 = disabled, 1 = enabled (default).
	
		pss=		[HW,OSS] Personal Sound System (ECHO ESC614)
				Format:
				<io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
	
		pt.		[PARIDE]
				See Documentation/blockdev/paride.txt.
	
		pty.legacy_count=
				[KNL] Number of legacy pty's. Overwrites compiled-in
				default number.
	
		quiet		[KNL] Disable most log messages
	
		r128=		[HW,DRM]
	
		raid=		[HW,RAID]
				See Documentation/md.txt.
	
		ramdisk_blocksize=	[RAM]
				See Documentation/blockdev/ramdisk.txt.
	
		ramdisk_size=	[RAM] Sizes of RAM disks in kilobytes
				See Documentation/blockdev/ramdisk.txt.
	
		rcupdate.blimit=	[KNL,BOOT]
				Set maximum number of finished RCU callbacks to process
				in one batch.
	
		rcupdate.qhimark=	[KNL,BOOT]
				Set threshold of queued
				RCU callbacks over which batch limiting is disabled.
	
		rcupdate.qlowmark=	[KNL,BOOT]
				Set threshold of queued RCU callbacks below which
				batch limiting is re-enabled.
	
		rdinit=		[KNL]
				Format: <full_path>
				Run specified binary instead of /init from the ramdisk,
				used for early userspace startup. See initrd.
	
		reboot=		[BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
				Format: <reboot_mode>[,<reboot_mode2>[,...]]
				See arch/*/kernel/reboot.c or arch/*/kernel/process.c
	
		relax_domain_level=
				[KNL, SMP] Set scheduler's default relax_domain_level.
				See Documentation/cgroups/cpusets.txt.
	
		reserve=	[KNL,BUGS] Force the kernel to ignore some iomem area
	
		reservetop=	[X86-32]
				Format: nn[KMG]
				Reserves a hole at the top of the kernel virtual
				address space.
	
		reset_devices	[KNL] Force drivers to reset the underlying device
				during initialization.
	
		resume=		[SWSUSP]
				Specify the partition device for software suspend
	
		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
	
		retain_initrd	[RAM] Keep initrd memory after extraction
	
		rhash_entries=	[KNL,NET]
				Set number of hash buckets for route cache
	
		riscom8=	[HW,SERIAL]
				Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
	
		ro		[KNL] Mount root device read-only on boot
	
		root=		[KNL] Root filesystem
	
		rootdelay=	[KNL] Delay (in seconds) to pause before attempting to
				mount the root filesystem
	
		rootflags=	[KNL] Set root filesystem mount option string
	
		rootfstype=	[KNL] Set root filesystem type
	
		rootwait	[KNL] Wait (indefinitely) for root device to show up.
				Useful for devices that are detected asynchronously
				(e.g. USB and MMC devices).
	
		root_plug.vendor_id=
				[ROOTPLUG] Override the default vendor ID
	
		root_plug.product_id=
				[ROOTPLUG] Override the default product ID
	
		root_plug.debug=
				[ROOTPLUG] Enable debugging output
	
		rw		[KNL] Mount root device read-write on boot
	
		S		[KNL] Run init in single mode
	
		sa1100ir	[NET]
				See drivers/net/irda/sa1100_ir.c.
	
		sbni=		[NET] Granch SBNI12 leased line adapter
	
		sc1200wdt=	[HW,WDT] SC1200 WDT (watchdog) driver
				Format: <io>[,<timeout>[,<isapnp>]]
	
		scsi_debug_*=	[SCSI]
				See drivers/scsi/scsi_debug.c.
	
		scsi_default_dev_flags=
				[SCSI] SCSI default device flags
				Format: <integer>
	
		scsi_dev_flags=	[SCSI] Black/white list entry for vendor and model
				Format: <vendor>:<model>:<flags>
				(flags are integer value)
	
		scsi_logging_level=	[SCSI] a bit mask of logging levels
				See drivers/scsi/scsi_logging.h for bits.  Also
				settable via sysctl at dev.scsi.logging_level
				(/proc/sys/dev/scsi/logging_level).
				There is also a nice 'scsi_logging_level' script in the
				S390-tools package, available for download at
				http://www-128.ibm.com/developerworks/linux/linux390/s390-tools-1.5.4.html
	
		scsi_mod.scan=	[SCSI] sync (default) scans SCSI busses as they are
				discovered.  async scans them in kernel threads,
				allowing boot to proceed.  none ignores them, expecting
				user space to do the scan.
	
		security=	[SECURITY] Choose a security module to enable at boot.
				If this boot parameter is not specified, only the first
				security module asking for security registration will be
				loaded. An invalid security module name will be treated
				as if no module has been chosen.
	
		selinux=	[SELINUX] Disable or enable SELinux at boot time.
				Format: { "0" | "1" }
				See security/selinux/Kconfig help text.
				0 -- disable.
				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.
	
		serialnumber	[BUGS=X86-32]
	
		shapers=	[NET]
				Maximal number of shapers.
	
		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.
	
		sim710=		[SCSI,HW]
				See header of drivers/scsi/sim710.c.
	
		simeth=		[IA-64]
		simscsi=
	
		slram=		[HW,MTD]
	
		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.
	
		slub_max_order= [MM, SLUB]
				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.
	
		slub_min_objects=	[MM, SLUB]
				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.
				For more information see Documentation/vm/slub.txt.
	
		slub_min_order=	[MM, SLUB]
				Determines the mininum page order for slabs. Must be
				lower than slub_max_order.
				For more information see Documentation/vm/slub.txt.
	
		slub_nomerge	[MM, SLUB]
				Disable merging of slabs with similar size. May be
				necessary if there is some reason to distinguish
				allocs to different slabs. Debug options disable
				merging on their own.
				For more information see Documentation/vm/slub.txt.
	
		smart2=		[HW]
				Format: <io1>[,<io2>[,...,<io8>]]
	
		smp-alt-once	[X86-32,SMP] On a hotplug CPU system, only
				attempt to substitute SMP alternatives once at boot.
	
		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
	
		snd-ad1816a=	[HW,ALSA]
	
		snd-ad1848=	[HW,ALSA]
	
		snd-ali5451=	[HW,ALSA]
	
		snd-als100=	[HW,ALSA]
	
		snd-als4000=	[HW,ALSA]
	
		snd-azt2320=	[HW,ALSA]
	
		snd-cmi8330=	[HW,ALSA]
	
		snd-cmipci=	[HW,ALSA]
	
		snd-cs4231=	[HW,ALSA]
	
		snd-cs4232=	[HW,ALSA]
	
		snd-cs4236=	[HW,ALSA]
	
		snd-cs4281=	[HW,ALSA]
	
		snd-cs46xx=	[HW,ALSA]
	
		snd-dt019x=	[HW,ALSA]
	
		snd-dummy=	[HW,ALSA]
	
		snd-emu10k1=	[HW,ALSA]
	
		snd-ens1370=	[HW,ALSA]
	
		snd-ens1371=	[HW,ALSA]
	
		snd-es968=	[HW,ALSA]
	
		snd-es1688=	[HW,ALSA]
	
		snd-es18xx=	[HW,ALSA]
	
		snd-es1938=	[HW,ALSA]
	
		snd-es1968=	[HW,ALSA]
	
		snd-fm801=	[HW,ALSA]
	
		snd-gusclassic=	[HW,ALSA]
	
		snd-gusextreme=	[HW,ALSA]
	
		snd-gusmax=	[HW,ALSA]
	
		snd-hdsp=	[HW,ALSA]
	
		snd-ice1712=	[HW,ALSA]
	
		snd-intel8x0=	[HW,ALSA]
	
		snd-interwave=	[HW,ALSA]
	
		snd-interwave-stb=
				[HW,ALSA]
	
		snd-korg1212=	[HW,ALSA]
	
		snd-maestro3=	[HW,ALSA]
	
		snd-mpu401=	[HW,ALSA]
	
		snd-mtpav=	[HW,ALSA]
	
		snd-nm256=	[HW,ALSA]
	
		snd-opl3sa2=	[HW,ALSA]
	
		snd-opti92x-ad1848=
				[HW,ALSA]
	
		snd-opti92x-cs4231=
				[HW,ALSA]
	
		snd-opti93x=	[HW,ALSA]
	
		snd-pmac=	[HW,ALSA]
	
		snd-rme32=	[HW,ALSA]
	
		snd-rme96=	[HW,ALSA]
	
		snd-rme9652=	[HW,ALSA]
	
		snd-sb8=	[HW,ALSA]
	
		snd-sb16=	[HW,ALSA]
	
		snd-sbawe=	[HW,ALSA]
	
		snd-serial=	[HW,ALSA]
	
		snd-sgalaxy=	[HW,ALSA]
	
		snd-sonicvibes=	[HW,ALSA]
	
		snd-sun-amd7930=
				[HW,ALSA]
	
		snd-sun-cs4231=	[HW,ALSA]
	
		snd-trident=	[HW,ALSA]
	
		snd-usb-audio=	[HW,ALSA,USB]
	
		snd-via82xx=	[HW,ALSA]
	
		snd-virmidi=	[HW,ALSA]
	
		snd-wavefront=	[HW,ALSA]
	
		snd-ymfpci=	[HW,ALSA]
	
		softlockup_panic=
				[KNL] Should the soft-lockup detector generate panics.
	
		sonypi.*=	[HW] Sony Programmable I/O Control Device driver
				See Documentation/sonypi.txt
	
		specialix=	[HW,SERIAL] Specialix multi-serial port adapter
				See Documentation/serial/specialix.txt.
	
		spia_io_base=	[HW,MTD]
		spia_fio_base=
		spia_pedr=
		spia_peddr=
	
		sscape=		[HW,OSS]
				Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
	
		st=		[HW,SCSI] SCSI tape parameters (buffers, etc.)
				See Documentation/scsi/st.txt.
	
		stacktrace	[FTRACE]
				Enabled the stack tracer on boot up.
	
		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>...]]
	
		sunrpc.min_resvport=
		sunrpc.max_resvport=
				[NFS,SUNRPC]
				SunRPC servers often require that client requests
				originate from a privileged port (i.e. a port in the
				range 0 < portnr < 1024).
				An administrator who wishes to reserve some of these
				ports for other uses may adjust the range that the
				kernel's sunrpc client considers to be privileged
				using these two parameters to set the minimum and
				maximum port values.
	
		sunrpc.pool_mode=
				[NFS]
				Control how the NFS server code allocates CPUs to
				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)
	
		sunrpc.tcp_slot_table_entries=
		sunrpc.udp_slot_table_entries=
				[NFS,SUNRPC]
				Sets the upper limit on the number of simultaneous
				RPC calls that can be sent from the client to a
				server. Increasing these values may allow you to
				improve throughput, but will also increase the
				amount of memory reserved for use by the client.
	
		swiotlb=	[IA-64] Number of I/O TLB slabs
	
		switches=	[HW,M68k]
	
		sym53c416=	[HW,SCSI]
				See header of drivers/scsi/sym53c416.c.
	
		sysrq_always_enabled
				[KNL]
				Ignore sysrq setting - this boot parameter will
				neutralize any effect of /proc/sys/kernel/sysrq.
				Useful for debugging.
	
		t128=		[HW,SCSI]
				See header of drivers/scsi/t128.c.
	
		tdfx=		[HW,DRM]
	
		test_suspend=	[SUSPEND]
				Specify "mem" (for Suspend-to-RAM) or "standby" (for
				standby suspend) as the system sleep state to briefly
				enter during system startup.  The system is woken from
				this state using a wakeup-capable RTC alarm.
	
		thash_entries=	[KNL,NET]
				Set number of hash buckets for TCP connection
	
		thermal.act=	[HW,ACPI]
				-1: disable all active trip points in all thermal zones
				<degrees C>: override all lowest active trip points
	
		thermal.crt=	[HW,ACPI]
				-1: disable all critical trip points in all thermal zones
				<degrees C>: override all critical trip points
	
		thermal.nocrt=	[HW,ACPI]
				Set to disable actions on ACPI thermal zone
				critical and hot trip points.
	
		thermal.off=	[HW,ACPI]
				1: disable ACPI thermal control
	
		thermal.psv=	[HW,ACPI]
				-1: disable all passive trip points
				<degrees C>: override all passive trip points to this
				value
	
		thermal.tzp=	[HW,ACPI]
				Specify global default ACPI thermal zone polling rate
				<deci-seconds>: poll all this frequency
				0: no polling (default)
	
		tmscsim=	[HW,SCSI]
				See comment before function dc390_setup() in
				drivers/scsi/tmscsim.c.
	
		topology=	[S390]
				Format: {off | on}
				Specify if the kernel should make use of the cpu
				topology informations if the hardware supports these.
				The scheduler will make use of these informations and
				e.g. base its process migration decisions on it.
				Default is off.
	
		tp720=		[HW,PS2]
	
		trace_buf_size=nn[KMG]
				[FTRACE] will set tracing buffer size.
	
		trace_event=[event-list]
				[FTRACE] Set and start specified trace events in order
				to facilitate early boot debugging.
				See also Documentation/trace/events.txt
	
		trix=		[HW,OSS] MediaTrix AudioTrix Pro
				Format:
				<io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
	
		tsc=		Disable clocksource-must-verify flag for TSC.
				Format: <string>
				[x86] reliable: mark tsc clocksource as reliable, this
				disables clocksource verification at runtime.
				Used to enable high-resolution timer mode on older
				hardware, and in virtualized environment.
	
		turbografx.map[2|3]=	[HW,JOY]
				TurboGraFX parallel port interface
				Format:
				<port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
				See also Documentation/input/joystick-parport.txt
	
		u14-34f=	[HW,SCSI] UltraStor 14F/34F SCSI host adapter
				See header of drivers/scsi/u14-34f.c.
	
		uart401=	[HW,OSS]
				Format: <io>,<irq>
	
		uart6850=	[HW,OSS]
				Format: <io>,<irq>
	
		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.
	
		unknown_nmi_panic
				[X86]
				Set unknown_nmi_panic=1 early on boot.
	
		usbcore.autosuspend=
				[USB] The autosuspend time delay (in seconds) used
				for newly-detected USB devices (default 2).  This
				is the time required before an idle device will be
				autosuspended.  Devices for which the delay is set
				to a negative value won't be autosuspended at all.
	
		usbcore.usbfs_snoop=
				[USB] Set to log all usbfs traffic (default 0 = off).
	
		usbcore.blinkenlights=
				[USB] Set to cycle leds on hubs (default 0 = off).
	
		usbcore.old_scheme_first=
				[USB] Start with the old device initialization
				scheme (default 0 = off).
	
		usbcore.use_both_schemes=
				[USB] Try the other device initialization scheme
				if the first one fails (default 1 = enabled).
	
		usbcore.initial_descriptor_timeout=
				[USB] Specifies timeout for the initial 64-byte
	                        USB_REQ_GET_DESCRIPTOR request in milliseconds
				(default 5000 = 5.0 seconds).
	
		usbhid.mousepoll=
				[USBHID] The interval which mice are to be polled at.
	
		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:
					a = SANE_SENSE (collect more than 18 bytes
						of sense data);
					c = FIX_CAPACITY (decrease the reported
						device capacity by one sector);
					h = CAPACITY_HEURISTICS (decrease the
						reported device capacity by one
						sector if the number is odd);
					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);
					o = CAPACITY_OK (accept the capacity
						reported by the device);
					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
	
		vdso=		[X86,SH]
				vdso=2: enable compat VDSO (default with COMPAT_VDSO)
				vdso=1: enable VDSO (default)
				vdso=0: disable VDSO mapping
	
		vdso32=		[X86]
				vdso32=2: enable compat VDSO (default with COMPAT_VDSO)
				vdso32=1: enable 32-bit VDSO (default)
				vdso32=0: disable 32-bit VDSO mapping
	
		vector=		[IA-64,SMP]
				vector=percpu: enable percpu vector domain
	
		video=		[FB] Frame buffer configuration
				See Documentation/fb/modedb.txt.
	
		vga=		[BOOT,X86-32] Select a particular video mode
				See Documentation/x86/boot.txt and
				Documentation/svga.txt.
				Use vga=ask for menu.
				This is actually a boot loader parameter; the value is
				passed to the kernel using a special protocol.
	
		vmalloc=nn[KMG]	[KNL,BOOT] Forces the vmalloc area to have an exact
				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.
	
		vmhalt=		[KNL,S390] Perform z/VM CP command after system halt.
				Format: <command>
	
		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>
	
		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.
	
		waveartist=	[HW,OSS]
				Format: <io>,<irq>,<dma>,<dma2>
	
		wd33c93=	[HW,SCSI]
				See header of drivers/scsi/wd33c93.c.
	
		wd7000=		[HW,SCSI]
				See header of drivers/scsi/wd7000.c.
	
		wdt=		[WDT] Watchdog
				See Documentation/watchdog/wdt.txt.
	
		x2apic_phys	[X86-64,APIC] Use x2apic physical mode instead of
				default x2apic cluster mode on platforms
				supporting x2apic.
	
		xd=		[HW,XT] Original XT pre-IDE (RLL encoded) disks.
		xd_geo=		See header of drivers/block/xd.c.
	
		xirc2ps_cs=	[NET,PCMCIA]
				Format:
				<irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
	
	______________________________________________________________________
	
	TODO:
	
		Add documentation for ALSA options.
		Add more DRM drivers.

• [ Documentation ]
• 00-INDEX
• [ ABI ]
• [ accounting ]
• [ acpi ]
• [ aoe ]
• applying-patches.txt
• [ arm ]
• atomic_ops.txt
• [ auxdisplay ]
• bad_memory.txt
• basic_profiling.txt
• binfmt_misc.txt
• [ blackfin ]
• [ block ]
• [ blockdev ]
• braille-console.txt
• bt8xxgpio.txt
• btmrvl.txt
• BUG-HUNTING
• c2port.txt
• cachetlb.txt
• [ cdrom ]
• [ cgroups ]
• Changes
• CodingStyle
• [ connector ]
• [ console ]
• [ cpu-freq ]
• cpu-hotplug.txt
• cpu-load.txt
• [ cpuidle ]
• cputopology.txt
• credentials.txt
• [ cris ]
• [ crypto ]
• dcdbas.txt
• debugging-modules.txt
• debugging-via-ohci1394.txt
• dell_rbu.txt
• [ development-process ]
• [ device-mapper ]
• devices.txt
• DMA-API.txt
• DMA-attributes.txt
• DMA-ISA-LPC.txt
• DMA-mapping.txt
• dmaengine.txt
• [ DocBook ]
• dontdiff
• [ driver-model ]
• [ dvb ]
• dynamic-debug-howto.txt
• [ early-userspace ]
• edac.txt
• eisa.txt
• email-clients.txt
• [ fault-injection ]
• [ fb ]
• feature-removal-schedule.txt
• [ filesystems ]
• [ firmware_class ]
• flexible-arrays.txt
• [ frv ]
• futex-requeue-pi.txt
• gcov.txt
• gpio.txt
• highuid.txt
• HOWTO
• hw_random.txt
• [ hwmon ]
• [ i2c ]
• [ i2o ]
• [ ia64 ]
• ics932s401
• [ ide ]
• [ infiniband ]
• initrd.txt
• [ input ]
• Intel-IOMMU.txt
• intel_txt.txt
• io-mapping.txt
• IO-mapping.txt
• io_ordering.txt
• [ ioctl ]
• iostats.txt
• IPMI.txt
• IRQ-affinity.txt
• IRQ.txt
• irqflags-tracing.txt
• isapnp.txt
• [ isdn ]
• [ ja_JP ]
• java.txt
• [ kbuild ]
• [ kdump ]
• kernel-doc-nano-HOWTO.txt
• kernel-docs.txt
• kernel-parameters.txt
• keys-request-key.txt
• keys.txt
• kmemcheck.txt
• kmemleak.txt
• [ ko_KR ]
• kobject.txt
• kprobes.txt
• kref.txt
• [ kvm ]
• [ laptops ]
• ldm.txt
• leds-class.txt
• leds-lp3944.txt
• [ lguest ]
• local_ops.txt
• lockdep-design.txt
• lockstat.txt
• logo.gif
• logo.txt
• [ m68k ]
• magic-number.txt
• [ make ]
• Makefile
• ManagementStyle
• mca.txt
• md.txt
• memory-barriers.txt
• memory-hotplug.txt
• memory.txt
• [ mips ]
• [ misc-devices ]
• [ mn10300 ]
• mono.txt
• [ mtd ]
• mutex-design.txt
• [ namespaces ]
• [ netlabel ]
• [ networking ]
• nmi_watchdog.txt
• nommu-mmap.txt
• numastat.txt
• oops-tracing.txt
• [ parisc ]
• parport-lowlevel.txt
• parport.txt
• [ PCI ]
• [ pcmcia ]
• pi-futex.txt
• pnp.txt
• [ power ]
• [ powerpc ]
• [ pps ]
• [ prctl ]
• preempt-locking.txt
• printk-formats.txt
• prio_tree.txt
• rbtree.txt
• [ RCU ]
• rfkill.txt
• robust-futex-ABI.txt
• robust-futexes.txt
• rt-mutex-design.txt
• rt-mutex.txt
• rtc.txt
• [ s390 ]
• SAK.txt
• [ scheduler ]
• [ scsi ]
• SecurityBugs
• SELinux.txt
• [ serial ]
• serial-console.txt
• sgi-ioc4.txt
• sgi-visws.txt
• [ sh ]
• slow-work.txt
• SM501.txt
• Smack.txt
• [ sound ]
• [ sparc ]
• sparse.txt
• [ spi ]
• spinlocks.txt
• stable_api_nonsense.txt
• stable_kernel_rules.txt
• SubmitChecklist
• SubmittingDrivers
• SubmittingPatches
• svga.txt
• [ sysctl ]
• sysfs-rules.txt
• sysrq.txt
• [ telephony ]
• [ thermal ]
• [ timers ]
• tomoyo.txt
• [ trace ]
• [ uml ]
• unaligned-memory-access.txt
• unicode.txt
• unshare.txt
• [ usb ]
• VGA-softcursor.txt
• vgaarbiter.txt
• video-output.txt
• [ video4linux ]
• [ vm ]
• volatile-considered-harmful.txt
• voyager.txt
• [ w1 ]
• [ watchdog ]
• [ wimax ]
• [ x86 ]
• [ zh_CN ]
• zorro.txt
•