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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / Documentation / kernel-parameters.txt
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1 February 2003             Kernel Parameters                     v2.5.59
2                           ~~~~~~~~~~~~~~~~~
4 The following is a consolidated list of the kernel parameters as implemented
5 (mostly) by the __setup() macro and sorted into English Dictionary order
6 (defined as ignoring all punctuation and sorting digits before letters in a
7 case insensitive manner), and with descriptions where known.
9 Module parameters for loadable modules are specified only as the
10 parameter name with optional '=' and value as appropriate, such as:
12         modprobe usbcore blinkenlights=1
14 Module parameters for modules that are built into the kernel image
15 are specified on the kernel command line with the module name plus
16 '.' plus parameter name, with '=' and value if appropriate, such as:
18         usbcore.blinkenlights=1
20 The text in square brackets at the beginning of the description state the
21 restrictions on the kernel for the said kernel parameter to be valid. The
22 restrictions referred to are that the relevant option is valid if:
24         ACPI    ACPI support is enabled.
25         ALSA    ALSA sound support is enabled.
26         APIC    APIC support is enabled.
27         APM     Advanced Power Management support is enabled.
28         AX25    Appropriate AX.25 support is enabled.
29         CD      Appropriate CD support is enabled.
30         DEVFS   devfs support is enabled. 
31         DRM     Direct Rendering Management support is enabled. 
32         EDD     BIOS Enhanced Disk Drive Services (EDD) is enabled
33         EFI     EFI Partitioning (GPT) is enabled
34         EIDE    EIDE/ATAPI support is enabled.
35         FB      The frame buffer device is enabled.
36         HW      Appropriate hardware is enabled.
37         IA-32   IA-32 aka i386 architecture is enabled.
38         IA-64   IA-64 architecture is enabled.
39         IOSCHED More than one I/O scheduler is enabled.
40         IP_PNP  IP DCHP, BOOTP, or RARP is enabled.
41         ISAPNP  ISA PnP code is enabled.
42         ISDN    Appropriate ISDN support is enabled.
43         JOY     Appropriate joystick support is enabled.
44         LP      Printer support is enabled.
45         LOOP    Loopback device support is enabled.
46         M68k    M68k architecture is enabled.
47                         These options have more detailed description inside of
48                         Documentation/m68k/kernel-options.txt.
49         MCA     MCA bus support is enabled.
50         MDA     MDA console support is enabled.
51         MOUSE   Appropriate mouse support is enabled.
52         MTD     MTD support is enabled.
53         NET     Appropriate network support is enabled.
54         NUMA    NUMA support is enabled.
55         NFS     Appropriate NFS support is enabled.
56         OSS     OSS sound support is enabled.
57         PARIDE  The ParIDE subsystem is enabled.
58         PARISC  The PA-RISC architecture is enabled.
59         PCI     PCI bus support is enabled.
60         PCMCIA  The PCMCIA subsystem is enabled.
61         PNP     Plug & Play support is enabled.
62         PPC     PowerPC architecture is enabled.
63         PPT     Parallel port support is enabled.
64         PS2     Appropriate PS/2 support is enabled.
65         RAM     RAM disk support is enabled.
66         S390    S390 architecture is enabled.
67         SCSI    Appropriate SCSI support is enabled.
68                         A lot of drivers has their options described inside of
69                         Documentation/scsi/.
70         SELINUX SELinux support is enabled.
71         SERIAL  Serial support is enabled.
72         SMP     The kernel is an SMP kernel.
73         SPARC   Sparc architecture is enabled.
74         SWSUSP  Software suspension is enabled.
75         TS      Appropriate touchscreen support is enabled.
76         USB     USB support is enabled.
77         USBHID  USB Human Interface Device support is enabled.
78         V4L     Video For Linux support is enabled.
79         VGA     The VGA console has been enabled.
80         VT      Virtual terminal support is enabled.
81         WDT     Watchdog support is enabled.
82         XT      IBM PC/XT MFM hard disk support is enabled.
83         X86-64  X86-64 architecture is enabled.
84                         More X86-64 boot options can be found in
85                         Documentation/x86_64/boot-options.txt .
87 In addition, the following text indicates that the option:
89         BUGS=   Relates to possible processor bugs on the said processor.
90         KNL     Is a kernel start-up parameter.
91         BOOT    Is a boot loader parameter.
93 Parameters denoted with BOOT are actually interpreted by the boot
94 loader, and have no meaning to the kernel directly.
95 Do not modify the syntax of boot loader parameters without extreme
96 need or coordination with <Documentation/i386/boot.txt>.
98 Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
99 a trailing = on the name of any parameter states that that parameter will
100 be entered as an environment variable, whereas its absence indicates that
101 it will appear as a kernel argument readable via /proc/cmdline by programs
102 running once the system is up.
104         53c7xx=         [HW,SCSI] Amiga SCSI controllers
105                         See header of drivers/scsi/53c7xx.c.
106                         See also Documentation/scsi/ncr53c7xx.txt.
108         acpi=           [HW,ACPI] Advanced Configuration and Power Interface 
109                         Format: { force | off | ht | strict }
110                         force -- enable ACPI if default was off
111                         off -- disable ACPI if default was on
112                         noirq -- do not use ACPI for IRQ routing
113                         ht -- run only enough ACPI to enable Hyper Threading
114                         strict --  Be less tolerant of platforms that are not
115                                 strictly ACPI specification compliant.
117                         See also Documentation/pm.txt, pci=noacpi
119         acpi_sleep=     [HW,ACPI] Sleep options
120                         Format: { s3_bios, s3_mode }
121                         See Documentation/power/video.txt
123         acpi_sci=       [HW,ACPI] ACPI System Control Interrupt trigger mode
124                         Format: { level | edge |  high | low }
126         acpi_irq_balance        [HW,ACPI] ACPI will balance active IRQs
127                                 default in APIC mode
129         acpi_irq_nobalance      [HW,ACPI] ACPI will not move active IRQs (default)
130                                 default in PIC mode
132         acpi_irq_pci=   [HW,ACPI] If irq_balance, Clear listed IRQs for use by PCI
133                         Format: <irq>,<irq>...
135         acpi_irq_isa=   [HW,ACPI] If irq_balance, Mark listed IRQs used by ISA
136                         Format: <irq>,<irq>...
138         acpi_osi=       [HW,ACPI] empty param disables _OSI
140         acpi_serialize  [HW,ACPI] force serialization of AML methods
142         acpi_skip_timer_override [HW,ACPI]
143                         Recognize and ignore IRQ0/pin2 Interrupt Override.
144                         For broken nForce2 BIOS resulting in XT-PIC timer.
146         acpi_dbg_layer= [HW,ACPI]
147                         Format: <int>
148                         Each bit of the <int> indicates an acpi debug layer,
149                         1: enable, 0: disable. It is useful for boot time
150                         debugging. After system has booted up, it can be set
151                         via /proc/acpi/debug_layer.
153         acpi_dbg_level= [HW,ACPI]
154                         Format: <int>
155                         Each bit of the <int> indicates an acpi debug level,
156                         1: enable, 0: disable. It is useful for boot time
157                         debugging. After system has booted up, it can be set
158                         via /proc/acpi/debug_level.
160         acpi_fake_ecdt  [HW,ACPI] Workaround failure due to BIOS lacking ECDT
162         ad1816=         [HW,OSS]
163                         Format: <io>,<irq>,<dma>,<dma2>
164                         See also Documentation/sound/oss/AD1816.
166         ad1848=         [HW,OSS]
167                         Format: <io>,<irq>,<dma>,<dma2>,<type>
169         adlib=          [HW,OSS]
170                         Format: <io>
172         advansys=       [HW,SCSI]
173                         See header of drivers/scsi/advansys.c.
175         advwdt=         [HW,WDT] Advantech WDT
176                         Format: <iostart>,<iostop>
178         aedsp16=        [HW,OSS] Audio Excel DSP 16
179                         Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
180                         See also header of sound/oss/aedsp16.c.
182         aha152x=        [HW,SCSI]
183                         See Documentation/scsi/aha152x.txt.
185         aha1542=        [HW,SCSI]
186                         Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
188         aic7xxx=        [HW,SCSI]
189                         See Documentation/scsi/aic7xxx.txt.
191         aic79xx=        [HW,SCSI]
192                         See Documentation/scsi/aic79xx.txt.
194         AM53C974=       [HW,SCSI]
195                         Format: <host-scsi-id>,<target-scsi-id>,<max-rate>,<max-offset>
196                         See also header of drivers/scsi/AM53C974.c.
198         amijoy.map=     [HW,JOY] Amiga joystick support
199                         Map of devices attached to JOY0DAT and JOY1DAT
200                         Format: <a>,<b>
201                         See also Documentation/kernel/input/joystick.txt
203         analog.map=     [HW,JOY] Analog joystick and gamepad support
204                         Specifies type or capabilities of an analog joystick
205                         connected to one of 16 gameports
206                         Format: <type1>,<type2>,..<type16>
208         apc=            [HW,SPARC] Power management functions (SPARCstation-4/5 + deriv.)
209                         Format: noidle
210                         Disable APC CPU standby support. SPARCstation-Fox does
211                         not play well with APC CPU idle - disable it if you have
212                         APC and your system crashes randomly.
214         apic=           [APIC,i386] Change the output verbosity  whilst booting
215                         Format: { quiet (default) | verbose | debug }
216                         Change the amount of debugging information output
217                         when initialising the APIC and IO-APIC components.
219         apm=            [APM] Advanced Power Management
220                         See header of arch/i386/kernel/apm.c.
222         applicom=       [HW]
223                         Format: <mem>,<irq>
225         arcrimi=        [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
226                         Format: <io>,<irq>,<nodeID>
228         ataflop=        [HW,M68k]
230         atarimouse=     [HW,MOUSE] Atari Mouse
232         atascsi=        [HW,SCSI] Atari SCSI
234         atkbd.extra=    [HW] Enable extra LEDs and keys on IBM RapidAccess,
235                         EzKey and similar keyboards
237         atkbd.reset=    [HW] Reset keyboard during initialization
239         atkbd.set=      [HW] Select keyboard code set 
240                         Format: <int> (2 = AT (default) 3 = PS/2)
242         atkbd.scroll=   [HW] Enable scroll wheel on MS Office and similar
243                         keyboards
245         atkbd.softraw=  [HW] Choose between synthetic and real raw mode
246                         Format: <bool> (0 = real, 1 = synthetic (default))
247         
248         atkbd.softrepeat=
249                         [HW] Use software keyboard repeat
251         autotest        [IA64]
253         awe=            [HW,OSS] AWE32/SB32/AWE64 wave table synth
254                         Format: <io>,<memsize>,<isapnp>
256         aztcd=          [HW,CD] Aztech CD268 CDROM driver
257                         Format: <io>,0x79 (?)
259         baycom_epp=     [HW,AX25]
260                         Format: <io>,<mode>
262         baycom_par=     [HW,AX25] BayCom Parallel Port AX.25 Modem
263                         Format: <io>,<mode>
264                         See header of drivers/net/hamradio/baycom_par.c.
266         baycom_ser_fdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Full Duplex Mode)
267                         Format: <io>,<irq>,<mode>[,<baud>]
268                         See header of drivers/net/hamradio/baycom_ser_fdx.c.
270         baycom_ser_hdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Half Duplex Mode)
271                         Format: <io>,<irq>,<mode>
272                         See header of drivers/net/hamradio/baycom_ser_hdx.c.
274         blkmtd_device=  [HW,MTD]
275         blkmtd_erasesz=
276         blkmtd_ro=
277         blkmtd_bs=
278         blkmtd_count=
280         bttv.card=      [HW,V4L] bttv (bt848 + bt878 based grabber cards)
281         bttv.radio=     Most important insmod options are available as kernel args too.
282         bttv.pll=       See Documentation/video4linux/bttv/Insmod-options
283         bttv.tuner=     and Documentation/video4linux/bttv/CARDLIST
285         BusLogic=       [HW,SCSI]
286                         See drivers/scsi/BusLogic.c, comment before function
287                         BusLogic_ParseDriverOptions().
289         c101=           [NET] Moxa C101 synchronous serial card
291         cachesize=      [BUGS=IA-32] Override level 2 CPU cache size detection.
292                         Sometimes CPU hardware bugs make them report the cache
293                         size incorrectly. The kernel will attempt work arounds
294                         to fix known problems, but for some CPUs it is not
295                         possible to determine what the correct size should be.
296                         This option provides an override for these situations.
298         cdu31a=         [HW,CD]
299                         Format: <io>,<irq>[,PAS]
300                         See header of drivers/cdrom/cdu31a.c.
302         chandev=        [HW,NET] Generic channel device initialisation
304         checkreqprot    [SELINUX] Set initial checkreqprot flag value.
305                         Format: { "0" | "1" }
306                         See security/selinux/Kconfig help text.
307                         0 -- check protection applied by kernel (includes any implied execute protection).
308                         1 -- check protection requested by application.
309                         Default value is set via a kernel config option.
310                         Value can be changed at runtime via /selinux/checkreqprot.
312         clock=          [BUGS=IA-32, HW] gettimeofday timesource override. 
313                         Forces specified timesource (if avaliable) to be used
314                         when calculating gettimeofday(). If specicified timesource
315                         is not avalible, it defaults to PIT. 
316                         Format: { pit | tsc | cyclone | pmtmr }
318         hpet=           [IA-32,HPET] option to disable HPET and use PIT.
319                         Format: disable
321         cm206=          [HW,CD]
322                         Format: { auto | [<io>,][<irq>] }
324         com20020=       [HW,NET] ARCnet - COM20020 chipset
325                         Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
327         com90io=        [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
328                         Format: <io>[,<irq>]
330         com90xx=        [HW,NET] ARCnet - COM90xx chipset (memory-mapped buffers)
331                         Format: <io>[,<irq>[,<memstart>]]
333         condev=         [HW,S390] console device
334         conmode=
336         console=        [KNL] Output console device and options.
338                 tty<n>  Use the virtual console device <n>.
340                 ttyS<n>[,options]
341                         Use the specified serial port.  The options are of
342                         the form "bbbbpn", where "bbbb" is the baud rate,
343                         "p" is parity ("n", "o", or "e"), and "n" is bits.
344                         Default is "9600n8".
346                         See also Documentation/serial-console.txt.
348                 uart,io,<addr>[,options]
349                 uart,mmio,<addr>[,options]
350                         Start an early, polled-mode console on the 8250/16550
351                         UART at the specified I/O port or MMIO address,
352                         switching to the matching ttyS device later.  The
353                         options are the same as for ttyS, above.
355         cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
356                         Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
358         cpia_pp=        [HW,PPT]
359                         Format: { parport<nr> | auto | none }
361         crashkernel=nn[KMG]@ss[KMG]
362                         [KNL] Reserve a chunk of physical memory to
363                         hold a kernel to switch to with kexec on panic.
365         cs4232=         [HW,OSS]
366                         Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq>
368         cs89x0_dma=     [HW,NET]
369                         Format: <dma>
371         cs89x0_media=   [HW,NET]
372                         Format: { rj45 | aui | bnc }
374         cyclades=       [HW,SERIAL] Cyclades multi-serial port adapter.
376         dasd=           [HW,NET]    
377                         See header of drivers/s390/block/dasd_devmap.c.
379         db9.dev[2|3]=   [HW,JOY] Multisystem joystick support via parallel port
380                         (one device per port)
381                         Format: <port#>,<type>
382                         See also Documentation/input/joystick-parport.txt
384         debug           [KNL] Enable kernel debugging (events log level).
386         decnet=         [HW,NET]
387                         Format: <area>[,<node>]
388                         See also Documentation/networking/decnet.txt.
390         devfs=          [DEVFS]
391                         See Documentation/filesystems/devfs/boot-options.
393         dhash_entries=  [KNL]
394                         Set number of hash buckets for dentry cache.
396         digi=           [HW,SERIAL]
397                         IO parameters + enable/disable command.
399         digiepca=       [HW,SERIAL]
400                         See drivers/char/README.epca and
401                         Documentation/digiepca.txt.
403         dmascc=         [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA
404                         support available.
405                         Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]]
407         dmasound=       [HW,OSS] Sound subsystem buffers
409         dscc4.setup=    [NET]
411         dtc3181e=       [HW,SCSI]
413         earlyprintk=    [IA-32, X86-64]
414                         earlyprintk=vga
415                         earlyprintk=serial[,ttySn[,baudrate]]
417                         Append ,keep to not disable it when the real console
418                         takes over.
420                         Only vga or serial at a time, not both.
422                         Currently only ttyS0 and ttyS1 are supported.
424                         Interaction with the standard serial driver is not
425                         very good.
427                         The VGA output is eventually overwritten by the real
428                         console.
430         eata=           [HW,SCSI]
432         eda=            [HW,PS2]
434         edb=            [HW,PS2]
436         edd=            [EDD]
437                         Format: {"of[f]" | "sk[ipmbr]"}
438                         See comment in arch/i386/boot/edd.S
440         edd             [EDD]
441                         Format: {"of[f]" | "sk[ipmbr]"}
442                         See comment in arch/i386/boot/edd.S
444         eicon=          [HW,ISDN] 
445                         Format: <id>,<membase>,<irq>
447         eisa_irq_edge=  [PARISC,HW]
448                         See header of drivers/parisc/eisa.c.
450         elanfreq=       [IA-32]
451                         See comment before function elanfreq_setup() in
452                         arch/i386/kernel/cpu/cpufreq/elanfreq.c.
454         elevator=       [IOSCHED]
455                         Format: {"as"|"cfq"|"deadline"|"noop"}
456                         See Documentation/block/as-iosched.txt
457                         and Documentation/block/deadline-iosched.txt for details.
458         elfcorehdr=     [IA-32]
459                         Specifies physical address of start of kernel core image
460                         elf header.
461                         See Documentation/kdump.txt for details.
463         enforcing       [SELINUX] Set initial enforcing status.
464                         Format: {"0" | "1"}
465                         See security/selinux/Kconfig help text.
466                         0 -- permissive (log only, no denials).
467                         1 -- enforcing (deny and log).
468                         Default value is 0.
469                         Value can be changed at runtime via /selinux/enforce.
471         es1370=         [HW,OSS]
472                         Format: <lineout>[,<micbias>]
473                         See also header of sound/oss/es1370.c.
475         es1371=         [HW,OSS]
476                         Format: <spdif>,[<nomix>,[<amplifier>]]
477                         See also header of sound/oss/es1371.c.
479         ether=          [HW,NET] Ethernet cards parameters
480                         This option is obsoleted by the "netdev=" option, which
481                         has equivalent usage. See its documentation for details.
483         eurwdt=         [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
484                         Format: <io>[,<irq>]
486         fd_mcs=         [HW,SCSI]
487                         See header of drivers/scsi/fd_mcs.c.
489         fdomain=        [HW,SCSI]
490                         See header of drivers/scsi/fdomain.c.
492         floppy=         [HW]
493                         See Documentation/floppy.txt.
495         ftape=          [HW] Floppy Tape subsystem debugging options.
496                         See Documentation/ftape.txt.
498         gamecon.map[2|3]=
499                         [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
500                         support via parallel port (up to 5 devices per port)
501                         Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
502                         See also Documentation/input/joystick-parport.txt
504         gamma=          [HW,DRM]
506         gdth=           [HW,SCSI]
507                         See header of drivers/scsi/gdth.c.
509         gpt             [EFI] Forces disk with valid GPT signature but
510                         invalid Protective MBR to be treated as GPT.
512         gscd=           [HW,CD]
513                         Format: <io>
515         gt96100eth=     [NET] MIPS GT96100 Advanced Communication Controller
517         gus=            [HW,OSS]
518                         Format: <io>,<irq>,<dma>,<dma16>
520         gvp11=          [HW,SCSI]
522         hashdist=       [KNL,NUMA] Large hashes allocated during boot
523                         are distributed across NUMA nodes.  Defaults on
524                         for IA-64, off otherwise.
526         hcl=            [IA-64] SGI's Hardware Graph compatibility layer
528         hd=             [EIDE] (E)IDE hard drive subsystem geometry
529                         Format: <cyl>,<head>,<sect>
531         hd?=            [HW] (E)IDE subsystem
532         hd?lun=         See Documentation/ide.txt.
534         highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact
535                         size of <nn>. This works even on boxes that have no
536                         highmem otherwise. This also works to reduce highmem
537                         size on bigger boxes.
539         hisax=          [HW,ISDN]
540                         See Documentation/isdn/README.HiSax.
542         hugepages=      [HW,IA-32,IA-64] Maximal number of HugeTLB pages.
544         noirqbalance    [IA-32,SMP,KNL] Disable kernel irq balancing
546         i8042.direct    [HW] Put keyboard port into non-translated mode
547         i8042.dumbkbd   [HW] Pretend that controlled can only read data from
548                              keyboard and can not control its state
549                              (Don't attempt to blink the leds)
550         i8042.noaux     [HW] Don't check for auxiliary (== mouse) port
551         i8042.nomux     [HW] Don't check presence of an active multiplexing
552                              controller
553         i8042.nopnp     [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX
554                              controllers
555         i8042.panicblink=
556                         [HW] Frequency with which keyboard LEDs should blink
557                              when kernel panics (default is 0.5 sec)
558         i8042.reset     [HW] Reset the controller during init and cleanup
559         i8042.unlock    [HW] Unlock (ignore) the keylock
561         i810=           [HW,DRM]
563         i8k.ignore_dmi  [HW] Continue probing hardware even if DMI data
564                         indicates that the driver is running on unsupported
565                         hardware.
566         i8k.force       [HW] Activate i8k driver even if SMM BIOS signature
567                         does not match list of supported models.
568         i8k.power_status
569                         [HW] Report power status in /proc/i8k
570                         (disabled by default)
571         i8k.restricted  [HW] Allow controlling fans only if SYS_ADMIN
572                         capability is set.
574         ibmmcascsi=     [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
575                         See Documentation/mca.txt.
577         icn=            [HW,ISDN]
578                         Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
580         ide=            [HW] (E)IDE subsystem
581                         Format: ide=nodma or ide=doubler or ide=reverse
582                         See Documentation/ide.txt.
584         ide?=           [HW] (E)IDE subsystem
585                         Format: ide?=noprobe or chipset specific parameters.
586                         See Documentation/ide.txt.
587         
588         idebus=         [HW] (E)IDE subsystem - VLB/PCI bus speed
589                         See Documentation/ide.txt.
591         idle=           [HW]
592                         Format: idle=poll or idle=halt
594         ihash_entries=  [KNL]
595                         Set number of hash buckets for inode cache.
597         in2000=         [HW,SCSI]
598                         See header of drivers/scsi/in2000.c.
600         init=           [KNL]
601                         Format: <full_path>
602                         Run specified binary instead of /sbin/init as init
603                         process.
605         initcall_debug  [KNL] Trace initcalls as they are executed.  Useful
606                         for working out where the kernel is dying during
607                         startup.
609         initrd=         [BOOT] Specify the location of the initial ramdisk
611         inport.irq=     [HW] Inport (ATI XL and Microsoft) busmouse driver
612                         Format: <irq>
614         inttest=        [IA64]
616         io7=            [HW] IO7 for Marvel based alpha systems
617                         See comment before marvel_specify_io7 in
618                         arch/alpha/kernel/core_marvel.c.
620         ip=             [IP_PNP]
621                         See Documentation/nfsroot.txt.
623         ip2=            [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
624                         See comment before ip2_setup() in drivers/char/ip2.c.
626         ips=            [HW,SCSI] Adaptec / IBM ServeRAID controller
627                         See header of drivers/scsi/ips.c.
629         irqfixup        [HW]
630                         When an interrupt is not handled search all handlers
631                         for it. Intended to get systems with badly broken
632                         firmware running.
634         irqpoll         [HW]
635                         When an interrupt is not handled search all handlers
636                         for it. Also check all handlers each timer
637                         interrupt. Intended to get systems with badly broken
638                         firmware running.
640         isapnp=         [ISAPNP]
641                         Format: <RDP>, <reset>, <pci_scan>, <verbosity>
643         isolcpus=       [KNL,SMP] Isolate CPUs from the general scheduler.
644                         Format: <cpu number>,...,<cpu number>
645                         This option can be used to specify one or more CPUs
646                         to isolate from the general SMP balancing and scheduling
647                         algorithms. The only way to move a process onto or off
648                         an "isolated" CPU is via the CPU affinity syscalls.
649                         <cpu number> begins at 0 and the maximum value is
650                         "number of CPUs in system - 1".
652                         This option is the preferred way to isolate CPUs. The
653                         alternative - manually setting the CPU mask of all tasks
654                         in the system can cause problems and suboptimal load
655                         balancer performance.
657         isp16=          [HW,CD]
658                         Format: <io>,<irq>,<dma>,<setup>
660         iucv=           [HW,NET] 
662         js=             [HW,JOY] Analog joystick
663                         See Documentation/input/joystick.txt.
665         keepinitrd      [HW,ARM]
667         kstack=N        [IA-32, X86-64] Print N words from the kernel stack
668                         in oops dumps.
670         l2cr=           [PPC]
672         lapic           [IA-32,APIC] Enable the local APIC even if BIOS disabled it.
674         lasi=           [HW,SCSI] PARISC LASI driver for the 53c700 chip
675                         Format: addr:<io>,irq:<irq>
677         llsc*=          [IA64]
678                         See function print_params() in arch/ia64/sn/kernel/llsc4.c.
680         load_ramdisk=   [RAM] List of ramdisks to load from floppy
681                         See Documentation/ramdisk.txt.
683         lockd.udpport=  [NFS]
685         lockd.tcpport=  [NFS]
687         logibm.irq=     [HW,MOUSE] Logitech Bus Mouse Driver
688                         Format: <irq>
690         loglevel=       All Kernel Messages with a loglevel smaller than the
691                         console loglevel will be printed to the console. It can
692                         also be changed with klogd or other programs. The
693                         loglevels are defined as follows:
695                         0 (KERN_EMERG)          system is unusable
696                         1 (KERN_ALERT)          action must be taken immediately
697                         2 (KERN_CRIT)           critical conditions
698                         3 (KERN_ERR)            error conditions
699                         4 (KERN_WARNING)        warning conditions
700                         5 (KERN_NOTICE)         normal but significant condition
701                         6 (KERN_INFO)           informational
702                         7 (KERN_DEBUG)          debug-level messages
704         log_buf_len=n   Sets the size of the printk ring buffer, in bytes.
705                         Format is n, nk, nM.  n must be a power of two.  The
706                         default is set in kernel config.
708         lp=0            [LP]    Specify parallel ports to use, e.g,
709         lp=port[,port...]       lp=none,parport0 (lp0 not configured, lp1 uses
710         lp=reset                first parallel port). 'lp=0' disables the
711         lp=auto                 printer driver. 'lp=reset' (which can be
712                                 specified in addition to the ports) causes
713                                 attached printers to be reset. Using
714                                 lp=port1,port2,... specifies the parallel ports
715                                 to associate lp devices with, starting with
716                                 lp0. A port specification may be 'none' to skip
717                                 that lp device, or a parport name such as
718                                 'parport0'. Specifying 'lp=auto' instead of a
719                                 port specification list means that device IDs
720                                 from each port should be examined, to see if
721                                 an IEEE 1284-compliant printer is attached; if
722                                 so, the driver will manage that printer.
723                                 See also header of drivers/char/lp.c.
725         lpj=n           [KNL]
726                         Sets loops_per_jiffy to given constant, thus avoiding
727                         time-consuming boot-time autodetection (up to 250 ms per
728                         CPU). 0 enables autodetection (default). To determine
729                         the correct value for your kernel, boot with normal
730                         autodetection and see what value is printed. Note that
731                         on SMP systems the preset will be applied to all CPUs,
732                         which is likely to cause problems if your CPUs need
733                         significantly divergent settings. An incorrect value
734                         will cause delays in the kernel to be wrong, leading to
735                         unpredictable I/O errors and other breakage. Although
736                         unlikely, in the extreme case this might damage your
737                         hardware.
739         ltpc=           [NET]
740                         Format: <io>,<irq>,<dma>
742         mac5380=        [HW,SCSI]
743                         Format: <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
745         mac53c9x=       [HW,SCSI]
746                         Format: <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
748         machvec=        [IA64]
749                         Force the use of a particular machine-vector (machvec) in a generic
750                         kernel.  Example: machvec=hpzx1_swiotlb
752         mad16=          [HW,OSS]
753                         Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
755         maui=           [HW,OSS]
756                         Format: <io>,<irq>
758         max_loop=       [LOOP] Maximum number of loopback devices that can
759                         be mounted
760                         Format: <1-256>
762         maxcpus=        [SMP] Maximum number of processors that an SMP kernel
763                         should make use of
765         max_luns=       [SCSI] Maximum number of LUNs to probe
766                         Should be between 1 and 2^32-1.
768         max_report_luns=
769                         [SCSI] Maximum number of LUNs received
770                         Should be between 1 and 16384.
772         mca-pentium     [BUGS=IA-32]
774         mcatest=        [IA-64]
776         mcd=            [HW,CD]
777                         Format: <port>,<irq>,<mitsumi_bug_93_wait>
779         mcdx=           [HW,CD]
781         mce             [IA-32] Machine Check Exception
783         md=             [HW] RAID subsystems devices and level
784                         See Documentation/md.txt.
786         mdacon=         [MDA]
787                         Format: <first>,<last>
788                         Specifies range of consoles to be captured by the MDA.
790         mem=nn[KMG]     [KNL,BOOT] Force usage of a specific amount of memory
791                         Amount of memory to be used when the kernel is not able
792                         to see the whole system memory or for test.
793                         [IA-32] Use together with memmap= to avoid physical
794                         address space collisions. Without memmap= PCI devices
795                         could be placed at addresses belonging to unused RAM.
797         mem=nopentium   [BUGS=IA-32] Disable usage of 4MB pages for kernel
798                         memory.
800         memmap=exactmap [KNL,IA-32] Enable setting of an exact
801                         E820 memory map, as specified by the user.
802                         Such memmap=exactmap lines can be constructed based on
803                         BIOS output or other requirements. See the memmap=nn@ss
804                         option description.
806         memmap=nn[KMG]@ss[KMG]
807                         [KNL] Force usage of a specific region of memory
808                         Region of memory to be used, from ss to ss+nn.
810         memmap=nn[KMG]#ss[KMG]
811                         [KNL,ACPI] Mark specific memory as ACPI data.
812                         Region of memory to be used, from ss to ss+nn.
814         memmap=nn[KMG]$ss[KMG]
815                         [KNL,ACPI] Mark specific memory as reserved.
816                         Region of memory to be used, from ss to ss+nn.
818         meye.*=         [HW] Set MotionEye Camera parameters
819                         See Documentation/video4linux/meye.txt.
821         mga=            [HW,DRM]
823         mousedev.tap_time=
824                         [MOUSE] Maximum time between finger touching and
825                         leaving touchpad surface for touch to be considered
826                         a tap and be reported as a left button click (for
827                         touchpads working in absolute mode only).
828                         Format: <msecs>
829         mousedev.xres=  [MOUSE] Horizontal screen resolution, used for devices
830                         reporting absolute coordinates, such as tablets
831         mousedev.yres=  [MOUSE] Vertical screen resolution, used for devices
832                         reporting absolute coordinates, such as tablets
834         mpu401=         [HW,OSS]
835                         Format: <io>,<irq>
837         MTD_Partition=  [MTD]
838                         Format: <name>,<region-number>,<size>,<offset>
840         MTD_Region=     [MTD]
841                         Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
843         mtdparts=       [MTD]
844                         See drivers/mtd/cmdline.c.
846         mtouchusb.raw_coordinates=
847                         [HW] Make the MicroTouch USB driver use raw coordinates ('y', default)
848                         or cooked coordinates ('n')
850         n2=             [NET] SDL Inc. RISCom/N2 synchronous serial card
852         NCR_D700=       [HW,SCSI]
853                         See header of drivers/scsi/NCR_D700.c.
855         ncr5380=        [HW,SCSI]
857         ncr53c400=      [HW,SCSI]
859         ncr53c400a=     [HW,SCSI]
861         ncr53c406a=     [HW,SCSI]
863         ncr53c8xx=      [HW,SCSI]
865         netdev=         [NET] Network devices parameters
866                         Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
867                         Note that mem_start is often overloaded to mean
868                         something different and driver-specific.
870         nfsaddrs=       [NFS]
871                         See Documentation/nfsroot.txt.
873         nfsroot=        [NFS] nfs root filesystem for disk-less boxes.
874                         See Documentation/nfsroot.txt.
876         nmi_watchdog=   [KNL,BUGS=IA-32] Debugging features for SMP kernels
878         no387           [BUGS=IA-32] Tells the kernel to use the 387 maths
879                         emulation library even if a 387 maths coprocessor
880                         is present.
882         noalign         [KNL,ARM] 
884         noapic          [SMP,APIC] Tells the kernel to not make use of any
885                         IOAPICs that may be present in the system.
887         noasync         [HW,M68K] Disables async and sync negotiation for
888                         all devices.
890         nobats          [PPC] Do not use BATs for mapping kernel lowmem
891                         on "Classic" PPC cores.
893         nocache         [ARM]
895         nodisconnect    [HW,SCSI,M68K] Disables SCSI disconnects.
897         noexec          [IA-64]
899         noexec          [IA-32, X86-64]
900                         noexec=on: enable non-executable mappings (default)
901                         noexec=off: disable nn-executable mappings
903         nofxsr          [BUGS=IA-32]
905         nohlt           [BUGS=ARM]
907         no-hlt          [BUGS=IA-32] Tells the kernel that the hlt
908                         instruction doesn't work correctly and not to
909                         use it.
911         nohalt          [IA-64] Tells the kernel not to use the power saving
912                         function PAL_HALT_LIGHT when idle. This increases
913                         power-consumption. On the positive side, it reduces
914                         interrupt wake-up latency, which may improve performance
915                         in certain environments such as networked servers or
916                         real-time systems.
918         noirqdebug      [IA-32] Disables the code which attempts to detect and
919                         disable unhandled interrupt sources.
921         noisapnp        [ISAPNP] Disables ISA PnP code.
923         noinitrd        [RAM] Tells the kernel not to load any configured
924                         initial RAM disk.
926         nointroute      [IA-64]
928         nolapic         [IA-32,APIC] Do not enable or use the local APIC.
930         noltlbs         [PPC] Do not use large page/tlb entries for kernel
931                         lowmem mapping on PPC40x.
933         nomce           [IA-32] Machine Check Exception
935         noresidual      [PPC] Don't use residual data on PReP machines.
937         noresume        [SWSUSP] Disables resume and restore original swap space.
939         no-scroll       [VGA] Disables scrollback.
940                         This is required for the Braillex ib80-piezo Braille
941                         reader made by F.H. Papenmeier (Germany).
943         nosbagart       [IA-64]
945         nosmp           [SMP] Tells an SMP kernel to act as a UP kernel.
947         nosync          [HW,M68K] Disables sync negotiation for all devices.
949         notsc           [BUGS=IA-32] Disable Time Stamp Counter
951         nousb           [USB] Disable the USB subsystem
953         nowb            [ARM]
955         opl3=           [HW,OSS]
956                         Format: <io>
958         opl3sa=         [HW,OSS]
959                         Format: <io>,<irq>,<dma>,<dma2>,<mpu_io>,<mpu_irq>
961         opl3sa2=        [HW,OSS]
962                         Format: <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple]
964         oprofile.timer= [HW]
965                         Use timer interrupt instead of performance counters
967         optcd=          [HW,CD]
968                         Format: <io>
970         osst=           [HW,SCSI] SCSI Tape Driver
971                         Format: <buffer_size>,<write_threshold>
972                         See also Documentation/scsi/st.txt.
974         panic=          [KNL] Kernel behaviour on panic
975                         Format: <timeout>
977         parkbd.port=    [HW] Parallel port number the keyboard adapter is
978                         connected to, default is 0.
979                         Format: <parport#>
980         parkbd.mode=    [HW] Parallel port keyboard adapter mode of operation,
981                         0 for XT, 1 for AT (default is AT).
982                         Format: <mode> 
984         parport=0       [HW,PPT]        Specify parallel ports. 0 disables.
985         parport=auto                    Use 'auto' to force the driver to use
986         parport=0xBBB[,IRQ[,DMA]]       any IRQ/DMA settings detected (the
987                                         default is to ignore detected IRQ/DMA
988                                         settings because of possible
989                                         conflicts). You can specify the base
990                                         address, IRQ, and DMA settings; IRQ and
991                                         DMA should be numbers, or 'auto' (for
992                                         using detected settings on that
993                                         particular port), or 'nofifo' (to avoid
994                                         using a FIFO even if it is detected).
995                                         Parallel ports are assigned in the
996                                         order they are specified on the command
997                                         line, starting with parport0.
999         parport_init_mode=
1000                         [HW,PPT]        Configure VIA parallel port to
1001                                         operate in specific mode. This is
1002                                         necessary on Pegasos computer where
1003                                         firmware has no options for setting up
1004                                         parallel port mode and sets it to
1005                                         spp. Currently this function knows
1006                                         686a and 8231 chips.
1007                         Format: [spp|ps2|epp|ecp|ecpepp]
1009         pas2=           [HW,OSS]
1010                         Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
1012         pas16=          [HW,SCSI]
1013                         See header of drivers/scsi/pas16.c.
1015         pcbit=          [HW,ISDN]
1017         pcd.            [PARIDE]
1018                         See header of drivers/block/paride/pcd.c.
1019                         See also Documentation/paride.txt.
1021         pci=option[,option...]          [PCI] various PCI subsystem options:
1022                 off                     [IA-32] don't probe for the PCI bus
1023                 bios                    [IA-32] force use of PCI BIOS, don't access
1024                                         the hardware directly. Use this if your machine
1025                                         has a non-standard PCI host bridge.
1026                 nobios                  [IA-32] disallow use of PCI BIOS, only direct
1027                                         hardware access methods are allowed. Use this
1028                                         if you experience crashes upon bootup and you
1029                                         suspect they are caused by the BIOS.
1030                 conf1                   [IA-32] Force use of PCI Configuration Mechanism 1.
1031                 conf2                   [IA-32] Force use of PCI Configuration Mechanism 2.
1032                 nosort                  [IA-32] Don't sort PCI devices according to
1033                                         order given by the PCI BIOS. This sorting is done
1034                                         to get a device order compatible with older kernels.
1035                 biosirq                 [IA-32] Use PCI BIOS calls to get the interrupt
1036                                         routing table. These calls are known to be buggy
1037                                         on several machines and they hang the machine when used,
1038                                         but on other computers it's the only way to get the
1039                                         interrupt routing table. Try this option if the kernel
1040                                         is unable to allocate IRQs or discover secondary PCI
1041                                         buses on your motherboard.
1042                 rom                     [IA-32] Assign address space to expansion ROMs.
1043                                         Use with caution as certain devices share address
1044                                         decoders between ROMs and other resources.
1045                 irqmask=0xMMMM          [IA-32] Set a bit mask of IRQs allowed to be assigned
1046                                         automatically to PCI devices. You can make the kernel
1047                                         exclude IRQs of your ISA cards this way.
1048                 pirqaddr=0xAAAAA        [IA-32] Specify the physical address
1049                                         of the PIRQ table (normally generated
1050                                         by the BIOS) if it is outside the
1051                                         F0000h-100000h range.
1052                 lastbus=N               [IA-32] Scan all buses till bus #N. Can be useful
1053                                         if the kernel is unable to find your secondary buses
1054                                         and you want to tell it explicitly which ones they are.
1055                 assign-busses           [IA-32] Always assign all PCI bus
1056                                         numbers ourselves, overriding
1057                                         whatever the firmware may have
1058                                         done.
1059                 usepirqmask             [IA-32] Honor the possible IRQ mask
1060                                         stored in the BIOS $PIR table. This is
1061                                         needed on some systems with broken
1062                                         BIOSes, notably some HP Pavilion N5400
1063                                         and Omnibook XE3 notebooks. This will
1064                                         have no effect if ACPI IRQ routing is
1065                                         enabled.
1066                 noacpi                  [IA-32] Do not use ACPI for IRQ routing
1067                                         or for PCI scanning.
1068                 routeirq                Do IRQ routing for all PCI devices.
1069                                         This is normally done in pci_enable_device(),
1070                                         so this option is a temporary workaround
1071                                         for broken drivers that don't call it.
1073                 firmware                [ARM] Do not re-enumerate the bus but
1074                                         instead just use the configuration
1075                                         from the bootloader. This is currently
1076                                         used on IXP2000 systems where the
1077                                         bus has to be configured a certain way
1078                                         for adjunct CPUs.
1080         pcmv=           [HW,PCMCIA] BadgePAD 4
1082         pd.             [PARIDE]
1083                         See Documentation/paride.txt.
1085         pdcchassis=     [PARISC,HW] Disable/Enable PDC Chassis Status codes at
1086                         boot time.
1087                         Format: { 0 | 1 }
1088                         See arch/parisc/kernel/pdc_chassis.c
1090         pf.             [PARIDE]
1091                         See Documentation/paride.txt.
1093         pg.             [PARIDE]
1094                         See Documentation/paride.txt.
1096         pirq=           [SMP,APIC] Manual mp-table setup
1097                         See Documentation/i386/IO-APIC.txt.
1099         plip=           [PPT,NET] Parallel port network link
1100                         Format: { parport<nr> | timid | 0 }
1101                         See also Documentation/parport.txt.
1103         pnpacpi=        [ACPI]
1104                         { off }
1106         pnpbios=        [ISAPNP]
1107                         { on | off | curr | res | no-curr | no-res }
1109         pnp_reserve_irq=
1110                         [ISAPNP] Exclude IRQs for the autoconfiguration
1112         pnp_reserve_dma=
1113                         [ISAPNP] Exclude DMAs for the autoconfiguration
1115         pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration
1116                         Ranges are in pairs (I/O port base and size).
1118         pnp_reserve_mem=
1119                         [ISAPNP] Exclude memory regions for the autoconfiguration
1120                         Ranges are in pairs (memory base and size).
1122         profile=        [KNL] Enable kernel profiling via /proc/profile
1123                         { schedule | <number> }
1124                         (param: schedule - profile schedule points}
1125                         (param: profile step/bucket size as a power of 2 for
1126                                 statistical time based profiling)
1128         processor.max_cstate=   [HW, ACPI]
1129                         Limit processor to maximum C-state
1130                         max_cstate=9 overrides any DMI blacklist limit.
1132         prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
1133                         before loading.
1134                         See Documentation/ramdisk.txt.
1136         psmouse.proto=  [HW,MOUSE] Highest PS2 mouse protocol extension to
1137                         probe for (bare|imps|exps|lifebook|any).
1138         psmouse.rate=   [HW,MOUSE] Set desired mouse report rate, in reports
1139                         per second.
1140         psmouse.resetafter=
1141                         [HW,MOUSE] Try to reset the device after so many bad packets
1142                         (0 = never).
1143         psmouse.resolution=
1144                         [HW,MOUSE] Set desired mouse resolution, in dpi.
1145         psmouse.smartscroll=
1146                         [HW,MOUSE] Controls Logitech smartscroll autorepeat,
1147                         0 = disabled, 1 = enabled (default).
1149         pss=            [HW,OSS] Personal Sound System (ECHO ESC614)
1150                         Format: <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
1152         pt.             [PARIDE]
1153                         See Documentation/paride.txt.
1155         quiet=          [KNL] Disable log messages
1157         r128=           [HW,DRM]
1159         raid=           [HW,RAID]
1160                         See Documentation/md.txt.
1162         ramdisk=        [RAM] Sizes of RAM disks in kilobytes [deprecated]
1163                         See Documentation/ramdisk.txt.
1165         ramdisk_blocksize=
1166                         [RAM]
1167                         See Documentation/ramdisk.txt.
1169         ramdisk_size=   [RAM] Sizes of RAM disks in kilobytes
1170                         New name for the ramdisk parameter.
1171                         See Documentation/ramdisk.txt.
1173         reboot=         [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
1174                         Format: <reboot_mode>[,<reboot_mode2>[,...]]
1175                         See arch/*/kernel/reboot.c.
1177         reserve=        [KNL,BUGS] Force the kernel to ignore some iomem area
1179         resume=         [SWSUSP] Specify the partition device for software suspension
1181         rhash_entries=  [KNL,NET]
1182                         Set number of hash buckets for route cache
1184         riscom8=        [HW,SERIAL]
1185                         Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
1187         ro              [KNL] Mount root device read-only on boot
1189         root=           [KNL] Root filesystem
1191         rootdelay=      [KNL] Delay (in seconds) to pause before attempting to
1192                         mount the root filesystem
1194         rootflags=      [KNL] Set root filesystem mount option string
1196         rootfstype=     [KNL] Set root filesystem type
1198         rw              [KNL] Mount root device read-write on boot
1200         S               [KNL] Run init in single mode
1202         sa1100ir        [NET]
1203                         See drivers/net/irda/sa1100_ir.c.
1205         sb=             [HW,OSS]
1206                         Format: <io>,<irq>,<dma>,<dma2>
1208         sbni=           [NET] Granch SBNI12 leased line adapter
1210         sbpcd=          [HW,CD] Soundblaster CD adapter
1211                         Format: <io>,<type>
1212                         See a comment before function sbpcd_setup() in
1213                         drivers/cdrom/sbpcd.c.
1215         sc1200wdt=      [HW,WDT] SC1200 WDT (watchdog) driver
1216                         Format: <io>[,<timeout>[,<isapnp>]]
1218         scsi_debug_*=   [SCSI]
1219                         See drivers/scsi/scsi_debug.c.
1221         scsi_default_dev_flags=
1222                         [SCSI] SCSI default device flags
1223                         Format: <integer>
1225         scsi_dev_flags= [SCSI] Black/white list entry for vendor and model
1226                         Format: <vendor>:<model>:<flags>
1227                         (flags are integer value)
1229         scsi_logging=   [SCSI]
1231         selinux         [SELINUX] Disable or enable SELinux at boot time.
1232                         Format: { "0" | "1" }
1233                         See security/selinux/Kconfig help text.
1234                         0 -- disable.
1235                         1 -- enable.
1236                         Default value is set via kernel config option.
1237                         If enabled at boot time, /selinux/disable can be used
1238                         later to disable prior to initial policy load.
1240         serialnumber    [BUGS=IA-32]
1242         sg_def_reserved_size=
1243                         [SCSI]
1245         sgalaxy=        [HW,OSS]
1246                         Format: <io>,<irq>,<dma>,<dma2>,<sgbase>
1248         shapers=        [NET]
1249                         Maximal number of shapers.
1251         sim710=         [SCSI,HW]
1252                         See header of drivers/scsi/sim710.c.
1254         simeth=         [IA-64]
1255         simscsi=
1257         sjcd=           [HW,CD]
1258                         Format: <io>,<irq>,<dma>
1259                         See header of drivers/cdrom/sjcd.c.
1261         slram=          [HW,MTD]
1263         smart2=         [HW]
1264                         Format: <io1>[,<io2>[,...,<io8>]]
1266         snd-ad1816a=    [HW,ALSA]
1268         snd-ad1848=     [HW,ALSA]
1270         snd-ali5451=    [HW,ALSA]
1272         snd-als100=     [HW,ALSA]
1274         snd-als4000=    [HW,ALSA]
1276         snd-azt2320=    [HW,ALSA]
1278         snd-cmi8330=    [HW,ALSA]
1280         snd-cmipci=     [HW,ALSA]
1282         snd-cs4231=     [HW,ALSA]
1284         snd-cs4232=     [HW,ALSA]
1286         snd-cs4236=     [HW,ALSA]
1288         snd-cs4281=     [HW,ALSA]
1290         snd-cs46xx=     [HW,ALSA]
1292         snd-dt019x=     [HW,ALSA]
1294         snd-dummy=      [HW,ALSA]
1296         snd-emu10k1=    [HW,ALSA]
1298         snd-ens1370=    [HW,ALSA]
1300         snd-ens1371=    [HW,ALSA]
1302         snd-es968=      [HW,ALSA]
1304         snd-es1688=     [HW,ALSA]
1306         snd-es18xx=     [HW,ALSA]
1308         snd-es1938=     [HW,ALSA]
1310         snd-es1968=     [HW,ALSA]
1312         snd-fm801=      [HW,ALSA]
1314         snd-gusclassic= [HW,ALSA]
1316         snd-gusextreme= [HW,ALSA]
1318         snd-gusmax=     [HW,ALSA]
1320         snd-hdsp=       [HW,ALSA]
1322         snd-ice1712=    [HW,ALSA]
1324         snd-intel8x0=   [HW,ALSA]
1326         snd-interwave=  [HW,ALSA]
1328         snd-interwave-stb=
1329                         [HW,ALSA]
1331         snd-korg1212=   [HW,ALSA]
1333         snd-maestro3=   [HW,ALSA]
1335         snd-mpu401=     [HW,ALSA]
1337         snd-mtpav=      [HW,ALSA]
1339         snd-nm256=      [HW,ALSA]
1341         snd-opl3sa2=    [HW,ALSA]
1343         snd-opti92x-ad1848=
1344                         [HW,ALSA]
1346         snd-opti92x-cs4231=
1347                         [HW,ALSA]
1349         snd-opti93x=    [HW,ALSA]
1351         snd-pmac=       [HW,ALSA]
1353         snd-rme32=      [HW,ALSA]
1355         snd-rme96=      [HW,ALSA]
1357         snd-rme9652=    [HW,ALSA]
1359         snd-sb8=        [HW,ALSA]
1361         snd-sb16=       [HW,ALSA]
1363         snd-sbawe=      [HW,ALSA]
1365         snd-serial=     [HW,ALSA]
1367         snd-sgalaxy=    [HW,ALSA]
1369         snd-sonicvibes= [HW,ALSA]
1371         snd-sun-amd7930=
1372                         [HW,ALSA]
1374         snd-sun-cs4231= [HW,ALSA]
1376         snd-trident=    [HW,ALSA]
1378         snd-usb-audio=  [HW,ALSA,USB]
1380         snd-via82xx=    [HW,ALSA]
1382         snd-virmidi=    [HW,ALSA]
1384         snd-wavefront=  [HW,ALSA]
1386         snd-ymfpci=     [HW,ALSA]
1388         sonicvibes=     [HW,OSS]
1389                         Format: <reverb>
1391         sonycd535=      [HW,CD]
1392                         Format: <io>[,<irq>]
1394         sonypi.*=       [HW] Sony Programmable I/O Control Device driver
1395                         See Documentation/sonypi.txt
1397         specialix=      [HW,SERIAL] Specialix multi-serial port adapter
1398                         See Documentation/specialix.txt.
1400         spia_io_base=   [HW,MTD]
1401         spia_fio_base=
1402         spia_pedr=
1403         spia_peddr=
1405         sscape=         [HW,OSS]
1406                         Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
1408         st=             [HW,SCSI] SCSI tape parameters (buffers, etc.)
1409                         See Documentation/scsi/st.txt.
1411         st0x=           [HW,SCSI]
1412                         See header of drivers/scsi/seagate.c.
1414         sti=            [PARISC,HW]
1415                         Format: <num>
1416                         Set the STI (builtin display/keyboard on the HP-PARISC
1417                         machines) console (graphic card) which should be used
1418                         as the initial boot-console.
1419                         See also comment in drivers/video/console/sticore.c.
1421         sti_font=       [HW]
1422                         See comment in drivers/video/console/sticore.c.
1424         stifb=          [HW]
1425                         Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
1427         stram_swap=     [HW,M68k]
1429         swiotlb=        [IA-64] Number of I/O TLB slabs
1431         switches=       [HW,M68k]
1433         sym53c416=      [HW,SCSI]
1434                         See header of drivers/scsi/sym53c416.c.
1436         t128=           [HW,SCSI]
1437                         See header of drivers/scsi/t128.c.
1439         tdfx=           [HW,DRM]
1441         thash_entries=  [KNL,NET]
1442                         Set number of hash buckets for TCP connection
1444         time            Show timing data prefixed to each printk message line
1446         tipar.timeout=  [HW,PPT]
1447                         Set communications timeout in tenths of a second
1448                         (default 15).
1450         tipar.delay=    [HW,PPT]
1451                         Set inter-bit delay in microseconds (default 10).
1453         tmc8xx=         [HW,SCSI]
1454                         See header of drivers/scsi/seagate.c.
1456         tmscsim=        [HW,SCSI]
1457                         See comment before function dc390_setup() in
1458                         drivers/scsi/tmscsim.c.
1460         tp720=          [HW,PS2]
1462         trix=           [HW,OSS] MediaTrix AudioTrix Pro
1463                         Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
1465         tsdev.xres=     [TS] Horizontal screen resolution.
1466         tsdev.yres=     [TS] Vertical screen resolution.
1468         turbografx.map[2|3]=
1469                         [HW,JOY] TurboGraFX parallel port interface
1470                         Format: <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
1471                         See also Documentation/input/joystick-parport.txt
1473         u14-34f=        [HW,SCSI] UltraStor 14F/34F SCSI host adapter
1474                         See header of drivers/scsi/u14-34f.c.
1476         uart401=        [HW,OSS]
1477                         Format: <io>,<irq>
1479         uart6850=       [HW,OSS]
1480                         Format: <io>,<irq>
1482         usb-handoff     [HW] Enable early USB BIOS -> OS handoff
1484         usbhid.mousepoll=
1485                         [USBHID] The interval which mice are to be polled at.
1487         video=          [FB] Frame buffer configuration
1488                         See Documentation/fb/modedb.txt.
1490         vga=            [BOOT,IA-32] Select a particular video mode
1491                         See Documentation/i386/boot.txt and Documentation/svga.txt.
1492                         Use vga=ask for menu.
1493                         This is actually a boot loader parameter; the value is
1494                         passed to the kernel using a special protocol.
1496         vmalloc=nn[KMG] [KNL,BOOT] forces the vmalloc area to have an exact
1497                         size of <nn>. This can be used to increase the
1498                         minimum size (128MB on x86). It can also be used to
1499                         decrease the size and leave more room for directly
1500                         mapped kernel RAM.
1502         vmhalt=         [KNL,S390]
1504         vmpoff=         [KNL,S390] 
1506         waveartist=     [HW,OSS]
1507                         Format: <io>,<irq>,<dma>,<dma2>
1509         wd33c93=        [HW,SCSI]
1510                         See header of drivers/scsi/wd33c93.c.
1512         wd7000=         [HW,SCSI]
1513                         See header of drivers/scsi/wd7000.c.
1515         wdt=            [WDT] Watchdog
1516                         See Documentation/watchdog/watchdog.txt.
1518         xd=             [HW,XT] Original XT pre-IDE (RLL encoded) disks.
1519         xd_geo=         See header of drivers/block/xd.c.
1521         xirc2ps_cs=     [NET,PCMCIA]
1522                         Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
1526 Changelog:
1528         The last known update (for 2.4.0) - the changelog was not kept before.
1529         2000-06-??      Mr. Unknown
1531         Update for 2.5.49, description for most of the options introduced,
1532         references to other documentation (C files, READMEs, ..), added S390,
1533         PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and
1534         reformatting.
1535         2002-11-24      Petr Baudis <pasky@ucw.cz>
1536                         Randy Dunlap <randy.dunlap@verizon.net>
1538 TODO:
1540         Add documentation for ALSA options.
1541         Add more DRM drivers.