kernel-parameters.txt

					line, starting with parport0.

	parport_init_mode=
			[HW,PPT]	Configure VIA parallel port to
					operate in 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.

	pcbit=		[HW,ISDN]

	pcd.		[PARIDE]
			See header of drivers/block/paride/pcd.c.
			See also Documentation/paride.txt.

	pci=option[,option...]		[PCI] various PCI subsystem options:
		off			[IA-32] don't probe for the PCI bus
		bios			[IA-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			[IA-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			[IA-32] Force use of PCI Configuration Mechanism 1.
		conf2			[IA-32] Force use of PCI Configuration Mechanism 2.
		nosort			[IA-32] Don't sort PCI devices according to
					order given by the PCI BIOS. This sorting is done
					to get a device order compatible with older kernels.
		biosirq			[IA-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			[IA-32] Assign address space to expansion ROMs.
					Use with caution as certain devices share address
					decoders between ROMs and other resources.
		irqmask=0xMMMM		[IA-32] Set a bit mask of IRQs allowed to be assigned
					automatically to PCI devices. You can make the kernel
					exclude IRQs of your ISA cards this way.
		pirqaddr=0xAAAAA	[IA-32] Specify the physical address
					of the PIRQ table (normally generated
					by the BIOS) if it is outside the
					F0000h-100000h range.
		lastbus=N		[IA-32] Scan all buses till 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		[IA-32] Always assign all PCI bus
					numbers ourselves, overriding
					whatever the firmware may have
					done.
		usepirqmask		[IA-32] 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			[IA-32] Do not use ACPI for IRQ routing
					or for PCI scanning.
		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.

		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.

	pcmv=		[HW,PCMCIA] BadgePAD 4

	pd.		[PARIDE]
			See Documentation/paride.txt.

	pdcchassis=	[PARISC,HW] Disable/Enable PDC Chassis Status codes at
			boot time.
			Format: { 0 | 1 }
			See arch/parisc/kernel/pdc_chassis.c

	pf.		[PARIDE]
			See Documentation/paride.txt.

	pg.		[PARIDE]
			See Documentation/paride.txt.

	pirq=		[SMP,APIC] Manual mp-table setup
			See Documentation/i386/IO-APIC.txt.

	plip=		[PPT,NET] Parallel port network link
			Format: { parport<nr> | timid | 0 }
			See also Documentation/parport.txt.

	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).

	profile=	[KNL] Enable kernel profiling via /proc/profile
			{ schedule | <number> }
			(param: schedule - profile schedule points}
			(param: profile step/bucket size as a power of 2 for
				statistical time based profiling)

	processor.max_cstate=   [HW, ACPI]
			Limit processor to maximum C-state
			max_cstate=9 overrides any DMI blacklist limit.

	prompt_ramdisk=	[RAM] List of RAM disks to prompt for floppy disk
			before loading.
			See Documentation/ramdisk.txt.

	psmouse.proto=  [HW,MOUSE] Highest PS2 mouse protocol extension to
			probe for (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/paride.txt.

	quiet=		[KNL] Disable log messages
 
	r128=		[HW,DRM]

	raid=		[HW,RAID]
			See Documentation/md.txt.

	ramdisk=	[RAM] Sizes of RAM disks in kilobytes [deprecated]
			See Documentation/ramdisk.txt.

	ramdisk_blocksize=
			[RAM]
			See Documentation/ramdisk.txt.
 
	ramdisk_size=	[RAM] Sizes of RAM disks in kilobytes
			New name for the ramdisk parameter.
			See Documentation/ramdisk.txt.

	reboot=		[BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
			Format: <reboot_mode>[,<reboot_mode2>[,...]]
			See arch/*/kernel/reboot.c.

	reserve=	[KNL,BUGS] Force the kernel to ignore some iomem area

	resume=		[SWSUSP] Specify the partition device for software suspension

	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

	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.

	sb=		[HW,OSS]
			Format: <io>,<irq>,<dma>,<dma2>

	sbni=		[NET] Granch SBNI12 leased line adapter
 
	sbpcd=		[HW,CD] Soundblaster CD adapter
			Format: <io>,<type>
			See a comment before function sbpcd_setup() in
			drivers/cdrom/sbpcd.c.

	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=	[SCSI]

	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=IA-32]

	sg_def_reserved_size=
			[SCSI]
 
	sgalaxy=	[HW,OSS]
			Format: <io>,<irq>,<dma>,<dma2>,<sgbase>

	shapers=	[NET]
			Maximal number of shapers.
 
	sim710=		[SCSI,HW]
			See header of drivers/scsi/sim710.c.

	simeth=		[IA-64]
	simscsi=
 
	sjcd=		[HW,CD]
			Format: <io>,<irq>,<dma>
			See header of drivers/cdrom/sjcd.c.

	slram=		[HW,MTD]

	smart2=		[HW]
			Format: <io1>[,<io2>[,...,<io8>]]

	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]
 
	sonicvibes=	[HW,OSS]
			Format: <reverb>
 
	sonycd535=	[HW,CD]
			Format: <io>[,<irq>]

	sonypi.*=	[HW] Sony Programmable I/O Control Device driver
			See Documentation/sonypi.txt

	specialix=	[HW,SERIAL] Specialix multi-serial port adapter
			See Documentation/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.

	st0x=		[HW,SCSI]
			See header of drivers/scsi/seagate.c.

	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>...]]

	stram_swap=	[HW,M68k]

	swiotlb=	[IA-64] Number of I/O TLB slabs
 
	switches=	[HW,M68k]

	sym53c416=	[HW,SCSI]
			See header of drivers/scsi/sym53c416.c.

	t128=		[HW,SCSI]
			See header of drivers/scsi/t128.c.

	tdfx=		[HW,DRM]

	thash_entries=	[KNL,NET]
			Set number of hash buckets for TCP connection

	time		Show timing data prefixed to each printk message line

	tipar.timeout=	[HW,PPT]
			Set communications timeout in tenths of a second
			(default 15).

	tipar.delay=	[HW,PPT]
			Set inter-bit delay in microseconds (default 10).

	tmc8xx=		[HW,SCSI]
			See header of drivers/scsi/seagate.c.

	tmscsim=	[HW,SCSI]
			See comment before function dc390_setup() in
			drivers/scsi/tmscsim.c.

	tp720=		[HW,PS2]

	trix=		[HW,OSS] MediaTrix AudioTrix Pro
			Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
 
	tsdev.xres=	[TS] Horizontal screen resolution.
	tsdev.yres=	[TS] Vertical screen resolution.

	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>

	usb-handoff	[HW] Enable early USB BIOS -> OS handoff

	usbhid.mousepoll=
			[USBHID] The interval which mice are to be polled at.
 
	video=		[FB] Frame buffer configuration
			See Documentation/fb/modedb.txt.

	vga=		[BOOT,IA-32] Select a particular video mode
			See Documentation/i386/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]

	vmpoff=		[KNL,S390] 
 
	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/watchdog.txt.

	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>]]]



Changelog:

	The last known update (for 2.4.0) - the changelog was not kept before.
	2000-06-??	Mr. Unknown

	Update for 2.5.49, description for most of the options introduced,
	references to other documentation (C files, READMEs, ..), added S390,
	PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and
	reformatting.
	2002-11-24	Petr Baudis <pasky@ucw.cz>
			Randy Dunlap <randy.dunlap@verizon.net>

TODO:

	Add documentation for ALSA options.
	Add more DRM drivers.