Documentation/kernel-parameters.txt

   1 February 2003             Kernel Parameters                     v2.5.59
   2                           ~~~~~~~~~~~~~~~~~
   3
   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.
   8
   9 Module parameters for loadable modules are specified only as the
  10 parameter name with optional '=' and value as appropriate, such as:
  11
  12         modprobe usbcore blinkenlights=1
  13
  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:
  17
  18         usbcore.blinkenlights=1
  19
  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:
  23
  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         NFS     Appropriate NFS support is enabled.
  55         OSS     OSS sound support is enabled.
  56         PARIDE  The ParIDE subsystem is enabled.
  57         PCI     PCI bus support is enabled.
  58         PCMCIA  The PCMCIA subsystem is enabled.
  59         PNP     Plug & Play support is enabled.
  60         PPC     PowerPC architecture is enabled.
  61         PPT     Parallel port support is enabled.
  62         PS2     Appropriate PS/2 support is enabled.
  63         RAM     RAM disk support is enabled.
  64         S390    S390 architecture is enabled.
  65         SCSI    Appropriate SCSI support is enabled.
  66                         A lot of drivers has their options described inside of
  67                         Documentation/scsi/.
  68         SERIAL  Serial support is enabled.
  69         SMP     The kernel is an SMP kernel.
  70         SPARC   Sparc architecture is enabled.
  71         SWSUSP  Software suspension is enabled.
  72         TS      Appropriate touchscreen support is enabled.
  73         USB     USB support is enabled.
  74         V4L     Video For Linux support is enabled.
  75         VGA     The VGA console has been enabled.
  76         VT      Virtual terminal support is enabled.
  77         WDT     Watchdog support is enabled.
  78         XT      IBM PC/XT MFM hard disk support is enabled.
  79
  80 In addition, the following text indicates that the option:
  81
  82         BUGS=   Relates to possible processor bugs on the said processor.
  83         KNL     Is a kernel start-up parameter.
  84         BOOT    Is a boot loader parameter.
  85
  86 Parameters denoted with BOOT are actually interpreted by the boot
  87 loader, and have no meaning to the kernel directly.
  88 Do not modify the syntax of boot loader parameters without extreme
  89 need or coordination with <Documentation/i386/boot.txt>.
  90
  91 Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
  92 a trailing = on the name of any parameter states that that parameter will
  93 be entered as an environment variable, whereas its absence indicates that
  94 it will appear as a kernel argument readable via /proc/cmdline by programs
  95 running once the system is up.
  96
  97         53c7xx=         [HW,SCSI] Amiga SCSI controllers
  98                         See header of drivers/scsi/53c7xx.c.
  99                         See also Documentation/scsi/ncr53c7xx.txt.
 100
 101         acpi=           [HW,ACPI] Advanced Configuration and Power Interface
 102                         Format: { force | off | ht | strict }
 103                         force -- enable ACPI if default was off
 104                         off -- disable ACPI if default was on
 105                         noirq -- do not use ACPI for IRQ routing
 106                         ht -- run only enough ACPI to enable Hyper Threading
 107                         strict --  Be less tolerant of platforms that are not
 108                                 strictly ACPI specification compliant.
 109
 110                         See also Documentation/pm.txt, pci=noacpi
 111
 112         acpi_sleep=     [HW,ACPI] Sleep options
 113                         Format: { s3_bios, s3_mode }
 114                         See Documentation/power/video.txt
 115
 116         acpi_sci=       [HW,ACPI] ACPI System Control Interrupt trigger mode
 117                         Format: { level | edge |  high | low }
 118
 119         acpi_irq_balance        [HW,ACPI] ACPI will balance active IRQs
 120                                 default in APIC mode
 121
 122         acpi_irq_nobalance      [HW,ACPI] ACPI will not move active IRQs (default)
 123                                 default in PIC mode
 124
 125         acpi_irq_pci=   [HW,ACPI] If irq_balance, Clear listed IRQs for use by PCI
 126                         Format: <irq>,<irq>...
 127
 128         acpi_irq_isa=   [HW,ACPI] If irq_balance, Mark listed IRQs used by ISA
 129                         Format: <irq>,<irq>...
 130
 131         acpi_osi=       [HW,ACPI] empty param disables _OSI
 132
 133         acpi_serialize  [HW,ACPI] force serialization of AML methods
 134
 135         acpi_skip_timer_override [HW,ACPI]
 136                         Recognize and ignore IRQ0/pin2 Interrupt Override.
 137                         For broken nForce2 BIOS resulting in XT-PIC timer.
 138
 139         acpi_dbg_layer= [HW,ACPI]
 140                         Format: <int>
 141                         Each bit of the <int> indicates an acpi debug layer,
 142                         1: enable, 0: disable. It is useful for boot time
 143                         debugging. After system has booted up, it can be set
 144                         via /proc/acpi/debug_layer.
 145
 146         acpi_dbg_level= [HW,ACPI]
 147                         Format: <int>
 148                         Each bit of the <int> indicates an acpi debug level,
 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_level.
 152
 153         ad1816=         [HW,OSS]
 154                         Format: <io>,<irq>,<dma>,<dma2>
 155                         See also Documentation/sound/oss/AD1816.
 156
 157         ad1848=         [HW,OSS]
 158                         Format: <io>,<irq>,<dma>,<dma2>,<type>
 159
 160         adlib=          [HW,OSS]
 161                         Format: <io>
 162
 163         advansys=       [HW,SCSI]
 164                         See header of drivers/scsi/advansys.c.
 165
 166         advwdt=         [HW,WDT] Advantech WDT
 167                         Format: <iostart>,<iostop>
 168
 169         aedsp16=        [HW,OSS] Audio Excel DSP 16
 170                         Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
 171                         See also header of sound/oss/aedsp16.c.
 172
 173         aha152x=        [HW,SCSI]
 174                         See Documentation/scsi/aha152x.txt.
 175
 176         aha1542=        [HW,SCSI]
 177                         Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
 178
 179         aic7xxx=        [HW,SCSI]
 180                         See Documentation/scsi/aic7xxx.txt.
 181
 182         aic79xx=        [HW,SCSI]
 183                         See Documentation/scsi/aic79xx.txt.
 184
 185         AM53C974=       [HW,SCSI]
 186                         Format: <host-scsi-id>,<target-scsi-id>,<max-rate>,<max-offset>
 187                         See also header of drivers/scsi/AM53C974.c.
 188
 189         amijoy.map=     [HW,JOY] Amiga joystick support
 190                         Map of devices attached to JOY0DAT and JOY1DAT
 191                         Format: <a>,<b>
 192                         See also Documentation/kernel/input/joystick.txt
 193
 194         analog.map=     [HW,JOY] Analog joystick and gamepad support
 195                         Specifies type or capabilities of an analog joystick
 196                         connected to one of 16 gameports
 197                         Format: <type1>,<type2>,..<type16>
 198
 199         apc=            [HW,SPARC] Power management functions (SPARCstation-4/5 + deriv.)
 200                         Format: noidle
 201                         Disable APC CPU standby support. SPARCstation-Fox does
 202                         not play well with APC CPU idle - disable it if you have
 203                         APC and your system crashes randomly.
 204
 205         apic=           [APIC,i386] Change the output verbosity  whilst booting
 206                         Format: { quiet (default) | verbose | debug }
 207                         Change the amount of debugging information output
 208                         when initialising the APIC and IO-APIC components.
 209
 210         apm=            [APM] Advanced Power Management
 211                         See header of arch/i386/kernel/apm.c.
 212
 213         applicom=       [HW]
 214                         Format: <mem>,<irq>
 215
 216         arcrimi=        [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
 217                         Format: <io>,<irq>,<nodeID>
 218
 219         ataflop=        [HW,M68k]
 220
 221         atarimouse=     [HW,MOUSE] Atari Mouse
 222
 223         atascsi=        [HW,SCSI] Atari SCSI
 224
 225         atkbd.extra=    [HW] Enable extra LEDs and keys on IBM RapidAccess, EzKey
 226                         and similar keyboards
 227
 228         atkbd.reset=    [HW] Reset keyboard during initialization
 229
 230         atkbd.set=      [HW] Select keyboard code set
 231                         Format: <int> (2 = AT (default) 3 = PS/2)
 232
 233         atkbd.scroll=   [HW] Enable scroll wheel on MS Office and similar keyboards
 234
 235         atkbd.softrepeat=
 236                         [HW] Use software keyboard repeat
 237
 238         autotest        [IA64]
 239
 240         awe=            [HW,OSS] AWE32/SB32/AWE64 wave table synth
 241                         Format: <io>,<memsize>,<isapnp>
 242
 243         aztcd=          [HW,CD] Aztech CD268 CDROM driver
 244                         Format: <io>,0x79 (?)
 245
 246         baycom_epp=     [HW,AX25]
 247                         Format: <io>,<mode>
 248
 249         baycom_par=     [HW,AX25] BayCom Parallel Port AX.25 Modem
 250                         Format: <io>,<mode>
 251                         See header of drivers/net/hamradio/baycom_par.c.
 252
 253         baycom_ser_fdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Full Duplex Mode)
 254                         Format: <io>,<irq>,<mode>[,<baud>]
 255                         See header of drivers/net/hamradio/baycom_ser_fdx.c.
 256
 257         baycom_ser_hdx= [HW,AX25] BayCom Serial Port AX.25 Modem (Half Duplex Mode)
 258                         Format: <io>,<irq>,<mode>
 259                         See header of drivers/net/hamradio/baycom_ser_hdx.c.
 260
 261         blkmtd_device=  [HW,MTD]
 262         blkmtd_erasesz=
 263         blkmtd_ro=
 264         blkmtd_bs=
 265         blkmtd_count=
 266
 267         bttv.card=      [HW,V4L] bttv (bt848 + bt878 based grabber cards)
 268         bttv.radio=     Most important insmod options are available as kernel args too.
 269         bttv.pll=       See Documentation/video4linux/bttv/Insmod-options
 270         bttv.tuner=     and Documentation/video4linux/bttv/CARDLIST
 271
 272         BusLogic=       [HW,SCSI]
 273                         See drivers/scsi/BusLogic.c, comment before function
 274                         BusLogic_ParseDriverOptions().
 275
 276         c101=           [NET] Moxa C101 synchronous serial card
 277
 278         cachesize=      [BUGS=IA-32] Override level 2 CPU cache size detection.
 279                         Sometimes CPU hardware bugs make them report the cache
 280                         size incorrectly. The kernel will attempt work arounds
 281                         to fix known problems, but for some CPUs it is not
 282                         possible to determine what the correct size should be.
 283                         This option provides an override for these situations.
 284
 285         cdu31a=         [HW,CD]
 286                         Format: <io>,<irq>[,PAS]
 287                         See header of drivers/cdrom/cdu31a.c.
 288
 289         chandev=        [HW,NET] Generic channel device initialisation
 290
 291         clock=          [BUGS=IA-32, HW] gettimeofday timesource override.
 292                         Forces specified timesource (if avaliable) to be used
 293                         when calculating gettimeofday(). If specicified timesource
 294                         is not avalible, it defaults to PIT.
 295                         Format: { pit | tsc | cyclone | pmtmr }
 296
 297         hpet=           [IA-32,HPET] option to disable HPET and use PIT.
 298                         Format: disable
 299
 300         cm206=          [HW,CD]
 301                         Format: { auto | [<io>,][<irq>] }
 302
 303         com20020=       [HW,NET] ARCnet - COM20020 chipset
 304                         Format: <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
 305
 306         com90io=        [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
 307                         Format: <io>[,<irq>]
 308
 309         com90xx=        [HW,NET] ARCnet - COM90xx chipset (memory-mapped buffers)
 310                         Format: <io>[,<irq>[,<memstart>]]
 311
 312         condev=         [HW,S390] console device
 313         conmode=
 314
 315         console=        [KNL] Output console
 316                         Console device and comm spec (speed, control, parity).
 317
 318         cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
 319                         Format: <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
 320
 321         cpia_pp=        [HW,PPT]
 322                         Format: { parport<nr> | auto | none }
 323
 324         cs4232=         [HW,OSS]
 325                         Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq>
 326
 327         cs89x0_dma=     [HW,NET]
 328                         Format: <dma>
 329
 330         cs89x0_media=   [HW,NET]
 331                         Format: { rj45 | aui | bnc }
 332
 333         cyclades=       [HW,SERIAL] Cyclades multi-serial port adapter.
 334
 335         dasd=           [HW,NET]
 336                         See header of drivers/s390/block/dasd_devmap.c.
 337
 338         db9.dev[2|3]=   [HW,JOY] Multisystem joystick support via parallel port
 339                         (one device per port)
 340                         Format: <port#>,<type>
 341                         See also Documentation/input/joystick-parport.txt
 342
 343         debug           [KNL] Enable kernel debugging (events log level).
 344
 345         decnet=         [HW,NET]
 346                         Format: <area>[,<node>]
 347                         See also Documentation/networking/decnet.txt.
 348
 349         devfs=          [DEVFS]
 350                         See Documentation/filesystems/devfs/boot-options.
 351
 352         dhash_entries=  [KNL]
 353                         Set number of hash buckets for dentry cache.
 354
 355         digi=           [HW,SERIAL]
 356                         IO parameters + enable/disable command.
 357
 358         digiepca=       [HW,SERIAL]
 359                         See drivers/char/README.epca and
 360                         Documentation/digiepca.txt.
 361
 362         dmascc=         [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA
 363                         support available.
 364                         Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]]
 365
 366         dmasound=       [HW,OSS] Sound subsystem buffers
 367
 368         dscc4.setup=    [NET]
 369
 370         dtc3181e=       [HW,SCSI]
 371
 372         earlyprintk=    [x86, x86_64]
 373                         earlyprintk=vga
 374                         earlyprintk=serial[,ttySn[,baudrate]]
 375
 376                         Append ,keep to not disable it when the real console
 377                         takes over.
 378
 379                         Only vga or serial at a time, not both.
 380
 381                         Currently only ttyS0 and ttyS1 are supported.
 382
 383                         Interaction with the standard serial driver is not
 384                         very good.
 385
 386                         The VGA output is eventually overwritten by the real
 387                         console.
 388
 389         eata=           [HW,SCSI]
 390
 391         eda=            [HW,PS2]
 392
 393         edb=            [HW,PS2]
 394
 395         edd             [EDD]
 396                         Format: {"of[f]" | "sk[ipmbr]"}
 397                         See comment in arch/i386/boot/edd.S
 398
 399         eicon=          [HW,ISDN]
 400                         Format: <id>,<membase>,<irq>
 401
 402         eisa_irq_edge=  [PARISC]
 403                         See header of drivers/parisc/eisa.c.
 404
 405         elanfreq=       [IA-32]
 406                         See comment before function elanfreq_setup() in
 407                         arch/i386/kernel/cpu/cpufreq/elanfreq.c.
 408
 409         elevator=       [IOSCHED]
 410                         Format: {"as"|"cfq"|"deadline"|"noop"}
 411                         See Documentation/as-iosched.txt for details
 412
 413         es1370=         [HW,OSS]
 414                         Format: <lineout>[,<micbias>]
 415                         See also header of sound/oss/es1370.c.
 416
 417         es1371=         [HW,OSS]
 418                         Format: <spdif>,[<nomix>,[<amplifier>]]
 419                         See also header of sound/oss/es1371.c.
 420
 421         ether=          [HW,NET] Ethernet cards parameters
 422                         This option is obsoleted by the "netdev=" option, which
 423                         has equivalent usage. See its documentation for details.
 424
 425         eurwdt=         [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
 426                         Format: <io>[,<irq>]
 427
 428         fd_mcs=         [HW,SCSI]
 429                         See header of drivers/scsi/fd_mcs.c.
 430
 431         fdomain=        [HW,SCSI]
 432                         See header of drivers/scsi/fdomain.c.
 433
 434         floppy=         [HW]
 435                         See Documentation/floppy.txt.
 436
 437         ftape=          [HW] Floppy Tape subsystem debugging options.
 438                         See Documentation/ftape.txt.
 439
 440         gamecon.map[2|3]=
 441                         [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
 442                         support via parallel port (up to 5 devices per port)
 443                         Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
 444                         See also Documentation/input/joystick-parport.txt
 445
 446         gamma=          [HW,DRM]
 447
 448         gdth=           [HW,SCSI]
 449                         See header of drivers/scsi/gdth.c.
 450
 451         gpt             [EFI] Forces disk with valid GPT signature but
 452                         invalid Protective MBR to be treated as GPT.
 453
 454         gscd=           [HW,CD]
 455                         Format: <io>
 456
 457         gt96100eth=     [NET] MIPS GT96100 Advanced Communication Controller
 458
 459         gus=            [HW,OSS]
 460                         Format: <io>,<irq>,<dma>,<dma16>
 461
 462         gvp11=          [HW,SCSI]
 463
 464         hcl=            [IA-64] SGI's Hardware Graph compatibility layer
 465
 466         hd=             [EIDE] (E)IDE hard drive subsystem geometry
 467                         Format: <cyl>,<head>,<sect>
 468
 469         hd?=            [HW] (E)IDE subsystem
 470         hd?lun=         See Documentation/ide.txt.
 471
 472         highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact
 473                         size of <nn>. This works even on boxes that have no
 474                         highmem otherwise. This also works to reduce highmem
 475                         size on bigger boxes.
 476
 477         hisax=          [HW,ISDN]
 478                         See Documentation/isdn/README.HiSax.
 479
 480         hugepages=      [HW,IA-32,IA-64] Maximal number of HugeTLB pages.
 481
 482         noirqbalance    [IA-32,SMP,KNL] Disable kernel irq balancing
 483
 484         i8042.direct    [HW] Put keyboard port into non-translated mode
 485         i8042.dumbkbd   [HW] Pretend that controlled can only read data from
 486                              keyboard and can not control its state
 487                              (Don't attempt to blink the leds)
 488         i8042.noaux     [HW] Don't check for auxiliary (== mouse) port
 489         i8042.nomux     [HW] Don't check presence of an active multiplexing
 490                              controller
 491         i8042.reset     [HW] Reset the controller during init and cleanup
 492         i8042.unlock    [HW] Unlock (ignore) the keylock
 493
 494         i810=           [HW,DRM]
 495
 496         ibmmcascsi=     [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
 497                         See Documentation/mca.txt.
 498
 499         icn=            [HW,ISDN]
 500                         Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
 501
 502         ide?=           [HW] (E)IDE subsystem
 503                         Config (iomem/irq), tuning or debugging
 504                         (serialize,reset,no{dma,tune,probe}) or chipset
 505                         specific parameters.
 506                         See Documentation/ide.txt.
 507
 508         idebus=         [HW] (E)IDE subsystem - VLB/PCI bus speed
 509                         See Documentation/ide.txt.
 510
 511         idle=           [HW]
 512                         Format: idle=poll or idle=halt
 513
 514         ihash_entries=  [KNL]
 515                         Set number of hash buckets for inode cache.
 516
 517         in2000=         [HW,SCSI]
 518                         See header of drivers/scsi/in2000.c.
 519
 520         init=           [KNL]
 521                         Format: <full_path>
 522                         Run specified binary instead of /sbin/init as init
 523                         process.
 524
 525         initcall_debug  [KNL] Trace initcalls as they are executed.  Useful
 526                         for working out where the kernel is dying during
 527                         startup.
 528
 529         initrd=         [BOOT] Specify the location of the initial ramdisk
 530
 531         inport.irq=     [HW] Inport (ATI XL and Microsoft) busmouse driver
 532                         Format: <irq>
 533
 534         inttest=        [IA64]
 535
 536         io7=            [HW] IO7 for Marvel based alpha systems
 537                         See comment before marvel_specify_io7 in
 538                         arch/alpha/kernel/core_marvel.c.
 539
 540         ip=             [IP_PNP]
 541                         See Documentation/nfsroot.txt.
 542
 543         ip2=            [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
 544                         See comment before ip2_setup() in drivers/char/ip2.c.
 545
 546         ips=            [HW,SCSI] Adaptec / IBM ServeRAID controller
 547                         See header of drivers/scsi/ips.c.
 548
 549         isapnp=         [ISAPNP]
 550                         Format: <RDP>, <reset>, <pci_scan>, <verbosity>
 551
 552         isolcpus=       [KNL,SMP] Isolate CPUs from the general scheduler.
 553                         Format: <cpu number>, ..., <cpu number>
 554                         This option can be used to specify one or more CPUs
 555                         to isolate from the general SMP balancing and scheduling
 556                         algorithms. The only way to move a process onto or off
 557                         an "isolated" CPU is via the CPU affinity syscalls.
 558
 559                         This option is the preferred way to isolate CPUs. The
 560                         alternative - manually setting the CPU mask of all tasks
 561                         in the system can cause problems and suboptimal load
 562                         balancer performance.
 563
 564         isp16=          [HW,CD]
 565                         Format: <io>,<irq>,<dma>,<setup>
 566
 567         iucv=           [HW,NET]
 568
 569         js=             [HW,JOY] Analog joystick
 570                         See Documentation/input/joystick.txt.
 571
 572         keepinitrd      [HW,ARM]
 573
 574         l2cr=           [PPC]
 575
 576         lapic           [IA-32,APIC] Enable the local APIC even if BIOS disabled it.
 577
 578         lasi=           [HW,SCSI] PARISC LASI driver for the 53c700 chip
 579                         Format: addr:<io>,irq:<irq>
 580
 581         llsc*=          [IA64]
 582                         See function print_params() in arch/ia64/sn/kernel/llsc4.c.
 583
 584         load_ramdisk=   [RAM] List of ramdisks to load from floppy
 585                         See Documentation/ramdisk.txt.
 586
 587         lockd.udpport=  [NFS]
 588
 589         lockd.tcpport=  [NFS]
 590
 591         logibm.irq=     [HW,MOUSE] Logitech Bus Mouse Driver
 592                         Format: <irq>
 593
 594         log_buf_len=n   Sets the size of the printk ring buffer, in bytes.
 595                         Format is n, nk, nM.  n must be a power of two.  The
 596                         default is set in kernel config.
 597
 598         lp=0            [LP]    Specify parallel ports to use, e.g,
 599         lp=port[,port...]       lp=none,parport0 (lp0 not configured, lp1 uses
 600         lp=reset                first parallel port). 'lp=0' disables the
 601         lp=auto                 printer driver. 'lp=reset' (which can be
 602                                 specified in addition to the ports) causes
 603                                 attached printers to be reset. Using
 604                                 lp=port1,port2,... specifies the parallel ports
 605                                 to associate lp devices with, starting with
 606                                 lp0. A port specification may be 'none' to skip
 607                                 that lp device, or a parport name such as
 608                                 'parport0'. Specifying 'lp=auto' instead of a
 609                                 port specification list means that device IDs
 610                                 from each port should be examined, to see if
 611                                 an IEEE 1284-compliant printer is attached; if
 612                                 so, the driver will manage that printer.
 613                                 See also header of drivers/char/lp.c.
 614
 615         lpj=n           [KNL]
 616                         Sets loops_per_jiffy to given constant, thus avoiding
 617                         time-consuming boot-time autodetection (up to 250 ms per
 618                         CPU). 0 enables autodetection (default). To determine
 619                         the correct value for your kernel, boot with normal
 620                         autodetection and see what value is printed. Note that
 621                         on SMP systems the preset will be applied to all CPUs,
 622                         which is likely to cause problems if your CPUs need
 623                         significantly divergent settings. An incorrect value
 624                         will cause delays in the kernel to be wrong, leading to
 625                         unpredictable I/O errors and other breakage. Although
 626                         unlikely, in the extreme case this might damage your
 627                         hardware.
 628
 629         ltpc=           [NET]
 630                         Format: <io>,<irq>,<dma>
 631
 632         mac5380=        [HW,SCSI]
 633                         Format: <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
 634
 635         mac53c9x=       [HW,SCSI]
 636                         Format: <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
 637
 638         mad16=          [HW,OSS]
 639                         Format: <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
 640
 641         maui=           [HW,OSS]
 642                         Format: <io>,<irq>
 643
 644         max_loop=       [LOOP] Maximum number of loopback devices that can
 645                         be mounted
 646                         Format: <1-256>
 647
 648         maxcpus=        [SMP] Maximum number of processors that an SMP kernel
 649                         should make use of
 650
 651         max_scsi_luns=  [SCSI]
 652
 653         max_scsi_report_luns=
 654                         [SCSI] Maximum number of LUNs received
 655                         Should be between 1 and 16384.
 656
 657         mca-pentium     [BUGS=IA-32]
 658
 659         mcatest=        [IA-64]
 660
 661         mcd=            [HW,CD]
 662                         Format: <port>,<irq>,<mitsumi_bug_93_wait>
 663
 664         mcdx=           [HW,CD]
 665
 666         mce             [IA-32] Machine Check Exception
 667
 668         md=             [HW] RAID subsystems devices and level
 669                         See Documentation/md.txt.
 670
 671         mdacon=         [MDA]
 672                         Format: <first>,<last>
 673                         Specifies range of consoles to be captured by the MDA.
 674
 675         mem=nn[KMG]     [KNL,BOOT] Force usage of a specific amount of memory
 676                         Amount of memory to be used when the kernel is not able
 677                         to see the whole system memory or for test.
 678
 679         mem=nopentium   [BUGS=IA-32] Disable usage of 4MB pages for kernel
 680                         memory.
 681
 682         memmap=exactmap [KNL,IA-32] Enable setting of an exact
 683                         E820 memory map, as specified by the user.
 684                         Such memmap=exactmap lines can be constructed based on
 685                         BIOS output or other requirements. See the memmap=nn@ss
 686                         option description.
 687
 688         memmap=nn[KMG]@ss[KMG]
 689                         [KNL] Force usage of a specific region of memory
 690                         Region of memory to be used, from ss to ss+nn.
 691
 692         memmap=nn[KMG]#ss[KMG]
 693                         [KNL,ACPI] Mark specific memory as ACPI data.
 694                         Region of memory to be used, from ss to ss+nn.
 695
 696         memmap=nn[KMG]$ss[KMG]
 697                         [KNL,ACPI] Mark specific memory as reserved.
 698                         Region of memory to be used, from ss to ss+nn.
 699
 700         meye=           [HW] Set MotionEye Camera parameters
 701                         See Documentation/video4linux/meye.txt.
 702
 703         mga=            [HW,DRM]
 704
 705         mousedev.tap_time=
 706                         [MOUSE] Maximum time between finger touching and
 707                         leaving touchpad surface for touch to be considered
 708                         a tap and be reported as a left button click (for
 709                         touchpads working in absolute mode only).
 710                         Format: <msecs>
 711         mousedev.xres=  [MOUSE] Horizontal screen resolution, used for devices
 712                         reporting absolute coordinates, such as tablets
 713         mousedev.yres=  [MOUSE] Vertical screen resolution, used for devices
 714                         reporting absolute coordinates, such as tablets
 715
 716         mpu401=         [HW,OSS]
 717                         Format: <io>,<irq>
 718
 719         MTD_Partition=  [MTD]
 720                         Format: <name>,<region-number>,<size>,<offset>
 721
 722         MTD_Region=     [MTD]
 723                         Format: <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
 724
 725         mtdparts=       [MTD]
 726                         See drivers/mtd/cmdline.c.
 727
 728         n2=             [NET] SDL Inc. RISCom/N2 synchronous serial card
 729
 730         NCR_D700=       [HW,SCSI]
 731                         See header of drivers/scsi/NCR_D700.c.
 732
 733         ncr5380=        [HW,SCSI]
 734
 735         ncr53c400=      [HW,SCSI]
 736
 737         ncr53c400a=     [HW,SCSI]
 738
 739         ncr53c406a=     [HW,SCSI]
 740
 741         ncr53c8xx=      [HW,SCSI]
 742
 743         netdev=         [NET] Network devices parameters
 744                         Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
 745                         Note that mem_start is often overloaded to mean
 746                         something different and driver-specific.
 747
 748         nfsaddrs=       [NFS]
 749                         See Documentation/nfsroot.txt.
 750
 751         nfsroot=        [NFS] nfs root filesystem for disk-less boxes.
 752                         See Documentation/nfsroot.txt.
 753
 754         nmi_watchdog=   [KNL,BUGS=IA-32] Debugging features for SMP kernels
 755
 756         no387           [BUGS=IA-32] Tells the kernel to use the 387 maths
 757                         emulation library even if a 387 maths coprocessor
 758                         is present.
 759
 760         noalign         [KNL,ARM]
 761
 762         noapic          [SMP,APIC] Tells the kernel not to make use of any
 763                         APIC that may be present on the system.
 764
 765         noasync         [HW,M68K] Disables async and sync negotiation for
 766                         all devices.
 767
 768         nobats          [PPC] Do not use BATs for mapping kernel lowmem
 769                         on "Classic" PPC cores.
 770
 771         nocache         [ARM]
 772
 773         nodisconnect    [HW,SCSI,M68K] Disables SCSI disconnects.
 774
 775         noexec          [IA-64]
 776
 777         noexec          [i386]
 778                         noexec=on: enable non-executable mappings (default)
 779                         noexec=off: disable nn-executable mappings
 780
 781         nofxsr          [BUGS=IA-32]
 782
 783         nohighio        [BUGS=IA-32] Disable highmem block I/O.
 784
 785         nohlt           [BUGS=ARM]
 786
 787         no-hlt          [BUGS=IA-32] Tells the kernel that the hlt
 788                         instruction doesn't work correctly and not to
 789                         use it.
 790
 791         noirqdebug      [IA-32] Disables the code which attempts to detect and
 792                         disable unhandled interrupt sources.
 793
 794         noisapnp        [ISAPNP] Disables ISA PnP code.
 795
 796         noinitrd        [RAM] Tells the kernel not to load any configured
 797                         initial RAM disk.
 798
 799         nointroute      [IA-64]
 800
 801         nolapic         [IA-32,APIC] Do not enable or use the local APIC.
 802
 803         noltlbs         [PPC] Do not use large page/tlb entries for kernel
 804                         lowmem mapping on PPC40x.
 805
 806         nomce           [IA-32] Machine Check Exception
 807
 808         noresidual      [PPC] Don't use residual data on PReP machines.
 809
 810         noresume        [SWSUSP] Disables resume and restore original swap space.
 811
 812         no-scroll       [VGA] Disables scrollback.
 813                         This is required for the Braillex ib80-piezo Braille
 814                         reader made by F.H. Papenmeier (Germany).
 815
 816         nosbagart       [IA-64]
 817
 818         nosmp           [SMP] Tells an SMP kernel to act as a UP kernel.
 819
 820         nosync          [HW,M68K] Disables sync negotiation for all devices.
 821
 822         notsc           [BUGS=IA-32] Disable Time Stamp Counter
 823
 824         nousb           [USB] Disable the USB subsystem
 825
 826         nowb            [ARM]
 827
 828         opl3=           [HW,OSS]
 829                         Format: <io>
 830
 831         opl3sa=         [HW,OSS]
 832                         Format: <io>,<irq>,<dma>,<dma2>,<mpu_io>,<mpu_irq>
 833
 834         opl3sa2=        [HW,OSS]
 835                         Format: <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple]
 836
 837         oprofile.timer= [HW]
 838                         Use timer interrupt instead of performance counters
 839
 840         optcd=          [HW,CD]
 841                         Format: <io>
 842
 843         osst=           [HW,SCSI] SCSI Tape Driver
 844                         Format: <buffer_size>,<write_threshold>
 845                         See also Documentation/scsi/st.txt.
 846
 847         panic=          [KNL] Kernel behaviour on panic
 848                         Format: <timeout>
 849
 850         parport=0       [HW,PPT]        Specify parallel ports. 0 disables.
 851         parport=auto                    Use 'auto' to force the driver to use
 852         parport=0xBBB[,IRQ[,DMA]]       any IRQ/DMA settings detected (the
 853                                         default is to ignore detected IRQ/DMA
 854                                         settings because of possible
 855                                         conflicts). You can specify the base
 856                                         address, IRQ, and DMA settings; IRQ and
 857                                         DMA should be numbers, or 'auto' (for
 858                                         using detected settings on that
 859                                         particular port), or 'nofifo' (to avoid
 860                                         using a FIFO even if it is detected).
 861                                         Parallel ports are assigned in the
 862                                         order they are specified on the command
 863                                         line, starting with parport0.
 864
 865         pas2=           [HW,OSS]
 866                         Format: <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
 867
 868         pas16=          [HW,SCSI]
 869                         See header of drivers/scsi/pas16.c.
 870
 871         pcbit=          [HW,ISDN]
 872
 873         pcd.            [PARIDE]
 874                         See header of drivers/block/paride/pcd.c.
 875                         See also Documentation/paride.txt.
 876
 877         pci=option[,option...]          [PCI] various PCI subsystem options:
 878                 off                     [IA-32] don't probe for the PCI bus
 879                 bios                    [IA-32] force use of PCI BIOS, don't access
 880                                         the hardware directly. Use this if your machine
 881                                         has a non-standard PCI host bridge.
 882                 nobios                  [IA-32] disallow use of PCI BIOS, only direct
 883                                         hardware access methods are allowed. Use this
 884                                         if you experience crashes upon bootup and you
 885                                         suspect they are caused by the BIOS.
 886                 conf1                   [IA-32] Force use of PCI Configuration Mechanism 1.
 887                 conf2                   [IA-32] Force use of PCI Configuration Mechanism 2.
 888                 nosort                  [IA-32] Don't sort PCI devices according to
 889                                         order given by the PCI BIOS. This sorting is done
 890                                         to get a device order compatible with older kernels.
 891                 biosirq                 [IA-32] Use PCI BIOS calls to get the interrupt
 892                                         routing table. These calls are known to be buggy
 893                                         on several machines and they hang the machine when used,
 894                                         but on other computers it's the only way to get the
 895                                         interrupt routing table. Try this option if the kernel
 896                                         is unable to allocate IRQs or discover secondary PCI
 897                                         buses on your motherboard.
 898                 rom                     [IA-32] Assign address space to expansion ROMs.
 899                                         Use with caution as certain devices share address
 900                                         decoders between ROMs and other resources.
 901                 irqmask=0xMMMM          [IA-32] Set a bit mask of IRQs allowed to be assigned
 902                                         automatically to PCI devices. You can make the kernel
 903                                         exclude IRQs of your ISA cards this way.
 904                 lastbus=N               [IA-32] Scan all buses till bus #N. Can be useful
 905                                         if the kernel is unable to find your secondary buses
 906                                         and you want to tell it explicitly which ones they are.
 907                 assign-busses           [IA-32] Always assign all PCI bus
 908                                         numbers ourselves, overriding
 909                                         whatever the firmware may have
 910                                         done.
 911                 usepirqmask             [IA-32] Honor the possible IRQ mask
 912                                         stored in the BIOS $PIR table. This is
 913                                         needed on some systems with broken
 914                                         BIOSes, notably some HP Pavilion N5400
 915                                         and Omnibook XE3 notebooks. This will
 916                                         have no effect if ACPI IRQ routing is
 917                                         enabled.
 918                 noacpi                  [IA-32] Do not use ACPI for IRQ routing
 919                                         or for PCI scanning.
 920
 921                 firmware                [ARM] Do not re-enumerate the bus but
 922                                         instead just use the configuration
 923                                         from the bootloader. This is currently
 924                                         used on IXP2000 systems where the
 925                                         bus has to be configured a certain way
 926                                         for adjunct CPUs.
 927
 928         pcmv=           [HW,PCMCIA] BadgePAD 4
 929
 930         pd.             [PARIDE]
 931                         See Documentation/paride.txt.
 932
 933         pf.             [PARIDE]
 934                         See Documentation/paride.txt.
 935
 936         pg.             [PARIDE]
 937                         See Documentation/paride.txt.
 938
 939         pirq=           [SMP,APIC] Manual mp-table setup
 940                         See Documentation/i386/IO-APIC.txt.
 941
 942         plip=           [PPT,NET] Parallel port network link
 943                         Format: { parport<nr> | timid | 0 }
 944                         See also Documentation/parport.txt.
 945
 946         pnpbios=        [ISAPNP]
 947                         { on | off | curr | res | no-curr | no-res }
 948
 949         pnp_reserve_irq=
 950                         [ISAPNP] Exclude IRQs for the autoconfiguration
 951
 952         pnp_reserve_dma=
 953                         [ISAPNP] Exclude DMAs for the autoconfiguration
 954
 955         pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration
 956                         Ranges are in pairs (I/O port base and size).
 957
 958         pnp_reserve_mem=
 959                         [ISAPNP] Exclude memory regions for the autoconfiguration
 960                         Ranges are in pairs (memory base and size).
 961
 962         profile=        [KNL] Enable kernel profiling via /proc/profile
 963                         { schedule | <number> }
 964                         (param: schedule - profile schedule points}
 965                         (param: profile step/bucket size as a power of 2 for
 966                                 statistical time based profiling)
 967
 968         prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
 969                         before loading.
 970                         See Documentation/ramdisk.txt.
 971
 972         psmouse.proto=  [HW,MOUSE] Highest PS2 mouse protocol extension to
 973                         probe for (bare|imps|exps).
 974         psmouse.rate=   [HW,MOUSE] Set desired mouse report rate, in reports
 975                         per second.
 976         psmouse.resetafter=
 977                         [HW,MOUSE] Try to reset the device after so many bad packets
 978                         (0 = never).
 979         psmouse.resolution=
 980                         [HW,MOUSE] Set desired mouse resolution, in dpi.
 981         psmouse.smartscroll=
 982                         [HW,MOUSE] Controls Logitech smartscroll autorepeat,
 983                         0 = disabled, 1 = enabled (default).
 984
 985         pss=            [HW,OSS] Personal Sound System (ECHO ESC614)
 986                         Format: <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
 987
 988         pt.             [PARIDE]
 989                         See Documentation/paride.txt.
 990
 991         quiet=          [KNL] Disable log messages
 992
 993         r128=           [HW,DRM]
 994
 995         raid=           [HW,RAID]
 996                         See Documentation/md.txt.
 997
 998         ramdisk=        [RAM] Sizes of RAM disks in kilobytes [deprecated]
 999                         See Documentation/ramdisk.txt.
1000
1001         ramdisk_blocksize=
1002                         [RAM]
1003                         See Documentation/ramdisk.txt.
1004
1005         ramdisk_size=   [RAM] Sizes of RAM disks in kilobytes
1006                         New name for the ramdisk parameter.
1007                         See Documentation/ramdisk.txt.
1008
1009         ramdisk_start=  [RAM] Starting block of RAM disk image (so you can
1010                         place it after the kernel image on a boot floppy).
1011                         See Documentation/ramdisk.txt.
1012
1013         reboot=         [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
1014                         Format: <reboot_mode>[,<reboot_mode2>[,...]]
1015                         See arch/*/kernel/reboot.c.
1016
1017         reserve=        [KNL,BUGS] Force the kernel to ignore some iomem area
1018
1019         resume=         [SWSUSP] Specify the partition device for software suspension
1020
1021         rhash_entries=  [KNL,NET]
1022                         Set number of hash buckets for route cache
1023
1024         riscom8=        [HW,SERIAL]
1025                         Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
1026
1027         ro              [KNL] Mount root device read-only on boot
1028
1029         root=           [KNL] Root filesystem
1030
1031         rootflags=      [KNL] Set root filesystem mount option string
1032
1033         rootfstype=     [KNL] Set root filesystem type
1034
1035         rw              [KNL] Mount root device read-write on boot
1036
1037         S               [KNL] Run init in single mode
1038
1039         sa1100ir        [NET]
1040                         See drivers/net/irda/sa1100_ir.c.
1041
1042         sb=             [HW,OSS]
1043                         Format: <io>,<irq>,<dma>,<dma2>
1044
1045         sbni=           [NET] Granch SBNI12 leased line adapter
1046
1047         sbpcd=          [HW,CD] Soundblaster CD adapter
1048                         Format: <io>,<type>
1049                         See a comment before function sbpcd_setup() in
1050                         drivers/cdrom/sbpcd.c.
1051
1052         sc1200wdt=      [HW,WDT] SC1200 WDT (watchdog) driver
1053                         Format: <io>[,<timeout>[,<isapnp>]]
1054
1055         scsi_debug_*=   [SCSI]
1056                         See drivers/scsi/scsi_debug.c.
1057
1058         scsi_default_dev_flags=
1059                         [SCSI] SCSI default device flags
1060                         Format: <integer>
1061
1062         scsi_dev_flags= [SCSI] Black/white list entry for vendor and model
1063                         Format: <vendor>:<model>:<flags>
1064                         (flags are integer value)
1065
1066         scsi_logging=   [SCSI]
1067
1068         scsihosts=      [SCSI]
1069
1070         serialnumber    [BUGS=IA-32]
1071
1072         sf16fm=         [HW] SF16FMI radio driver for Linux
1073                         Format: <io>
1074
1075         sg_def_reserved_size=
1076                         [SCSI]
1077
1078         sgalaxy=        [HW,OSS]
1079                         Format: <io>,<irq>,<dma>,<dma2>,<sgbase>
1080
1081         shapers=        [NET]
1082                         Maximal number of shapers.
1083
1084         sim710=         [SCSI,HW]
1085                         See header of drivers/scsi/sim710.c.
1086
1087         simeth=         [IA-64]
1088         simscsi=
1089
1090         sjcd=           [HW,CD]
1091                         Format: <io>,<irq>,<dma>
1092                         See header of drivers/cdrom/sjcd.c.
1093
1094         slram=          [HW,MTD]
1095
1096         smart2=         [HW]
1097                         Format: <io1>[,<io2>[,...,<io8>]]
1098
1099         snd-ad1816a=    [HW,ALSA]
1100
1101         snd-ad1848=     [HW,ALSA]
1102
1103         snd-ali5451=    [HW,ALSA]
1104
1105         snd-als100=     [HW,ALSA]
1106
1107         snd-als4000=    [HW,ALSA]
1108
1109         snd-azt2320=    [HW,ALSA]
1110
1111         snd-cmi8330=    [HW,ALSA]
1112
1113         snd-cmipci=     [HW,ALSA]
1114
1115         snd-cs4231=     [HW,ALSA]
1116
1117         snd-cs4232=     [HW,ALSA]
1118
1119         snd-cs4236=     [HW,ALSA]
1120
1121         snd-cs4281=     [HW,ALSA]
1122
1123         snd-cs46xx=     [HW,ALSA]
1124
1125         snd-dt019x=     [HW,ALSA]
1126
1127         snd-dummy=      [HW,ALSA]
1128
1129         snd-emu10k1=    [HW,ALSA]
1130
1131         snd-ens1370=    [HW,ALSA]
1132
1133         snd-ens1371=    [HW,ALSA]
1134
1135         snd-es968=      [HW,ALSA]
1136
1137         snd-es1688=     [HW,ALSA]
1138
1139         snd-es18xx=     [HW,ALSA]
1140
1141         snd-es1938=     [HW,ALSA]
1142
1143         snd-es1968=     [HW,ALSA]
1144
1145         snd-fm801=      [HW,ALSA]
1146
1147         snd-gusclassic= [HW,ALSA]
1148
1149         snd-gusextreme= [HW,ALSA]
1150
1151         snd-gusmax=     [HW,ALSA]
1152
1153         snd-hdsp=       [HW,ALSA]
1154
1155         snd-ice1712=    [HW,ALSA]
1156
1157         snd-intel8x0=   [HW,ALSA]
1158
1159         snd-interwave=  [HW,ALSA]
1160
1161         snd-interwave-stb=
1162                         [HW,ALSA]
1163
1164         snd-korg1212=   [HW,ALSA]
1165
1166         snd-maestro3=   [HW,ALSA]
1167
1168         snd-mpu401=     [HW,ALSA]
1169
1170         snd-mtpav=      [HW,ALSA]
1171
1172         snd-nm256=      [HW,ALSA]
1173
1174         snd-opl3sa2=    [HW,ALSA]
1175
1176         snd-opti92x-ad1848=
1177                         [HW,ALSA]
1178
1179         snd-opti92x-cs4231=
1180                         [HW,ALSA]
1181
1182         snd-opti93x=    [HW,ALSA]
1183
1184         snd-pmac=       [HW,ALSA]
1185
1186         snd-rme32=      [HW,ALSA]
1187
1188         snd-rme96=      [HW,ALSA]
1189
1190         snd-rme9652=    [HW,ALSA]
1191
1192         snd-sb8=        [HW,ALSA]
1193
1194         snd-sb16=       [HW,ALSA]
1195
1196         snd-sbawe=      [HW,ALSA]
1197
1198         snd-serial=     [HW,ALSA]
1199
1200         snd-sgalaxy=    [HW,ALSA]
1201
1202         snd-sonicvibes= [HW,ALSA]
1203
1204         snd-sun-amd7930=
1205                         [HW,ALSA]
1206
1207         snd-sun-cs4231= [HW,ALSA]
1208
1209         snd-trident=    [HW,ALSA]
1210
1211         snd-usb-audio=  [HW,ALSA,USB]
1212
1213         snd-via82xx=    [HW,ALSA]
1214
1215         snd-virmidi=    [HW,ALSA]
1216
1217         snd-wavefront=  [HW,ALSA]
1218
1219         snd-ymfpci=     [HW,ALSA]
1220
1221         sonicvibes=     [HW,OSS]
1222                         Format: <reverb>
1223
1224         sonycd535=      [HW,CD]
1225                         Format: <io>[,<irq>]
1226
1227         sonypi=         [HW] Sony Programmable I/O Control Device driver
1228                         Format: <minor>,<verbose>,<fnkeyinit>,<camera>,<compat>,<nojogdial>
1229
1230         specialix=      [HW,SERIAL] Specialix multi-serial port adapter
1231                         See Documentation/specialix.txt.
1232
1233         speedstep_coppermine=
1234                         [HW,IA-32] Take CPU in your notebook as SpeedStep-capable
1235                         See comment before function speedstep_setup() in
1236                         arch/i386/kernel/cpu/cpufreq/speedstep.c.
1237
1238         spia_io_base=   [HW,MTD]
1239         spia_fio_base=
1240         spia_pedr=
1241         spia_peddr=
1242
1243         sscape=         [HW,OSS]
1244                         Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
1245
1246         st=             [HW,SCSI] SCSI tape parameters (buffers, etc.)
1247                         See Documentation/scsi/st.txt.
1248
1249         st0x=           [HW,SCSI]
1250                         See header of drivers/scsi/seagate.c.
1251
1252         sti=            [HW]
1253                         Format: <num>
1254                         Set the STI (builtin display/keyboard on the HP-PARISC
1255                         machines) console (graphic card) which should be used
1256                         as the initial boot-console.
1257                         See also comment in drivers/video/console/sticore.c.
1258
1259         sti_font=       [HW]
1260                         See comment in drivers/video/console/sticore.c.
1261
1262         stifb=          [HW]
1263                         Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
1264
1265         stram_swap=     [HW,M68k]
1266
1267         swiotlb=        [IA-64] Number of I/O TLB slabs
1268
1269         switches=       [HW,M68k]
1270
1271         sym53c416=      [HW,SCSI]
1272                         See header of drivers/scsi/sym53c416.c.
1273
1274         sym53c8xx=      [HW,SCSI]
1275                         See Documentation/scsi/ncr53c8xx.txt.
1276
1277         t128=           [HW,SCSI]
1278                         See header of drivers/scsi/t128.c.
1279
1280         tdfx=           [HW,DRM]
1281
1282         thash_entries=  [KNL,NET]
1283                         Set number of hash buckets for TCP connection
1284
1285         tipar=          [HW]
1286                         See header of drivers/char/tipar.c.
1287
1288         tiusb=          [HW,USB] Texas Instruments' USB GraphLink (aka SilverLink)
1289                         Format: <timeout>
1290
1291         tmc8xx=         [HW,SCSI]
1292                         See header of drivers/scsi/seagate.c.
1293
1294         tmscsim=        [HW,SCSI]
1295                         See comment before function dc390_setup() in
1296                         drivers/scsi/tmscsim.c.
1297
1298         tp720=          [HW,PS2]
1299
1300         trix=           [HW,OSS] MediaTrix AudioTrix Pro
1301                         Format: <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
1302
1303         tsdev.xres=     [TS] Horizontal screen resolution.
1304         tsdev.yres=     [TS] Vertical screen resolution.
1305
1306         turbografx.map[2|3]=
1307                         [HW,JOY] TurboGraFX parallel port interface
1308                         Format: <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
1309                         See also Documentation/input/joystick-parport.txt
1310
1311         u14-34f=        [HW,SCSI] UltraStor 14F/34F SCSI host adapter
1312                         See header of drivers/scsi/u14-34f.c.
1313
1314         uart401=        [HW,OSS]
1315                         Format: <io>,<irq>
1316
1317         uart6850=       [HW,OSS]
1318                         Format: <io>,<irq>
1319
1320         video=          [FB] Frame buffer configuration
1321                         See Documentation/fb/modedb.txt.
1322
1323         vga=            [BOOT,IA-32] Select a particular video mode
1324                         See Documentation/i386/boot.txt and Documentation/svga.txt.
1325                         Use vga=ask for menu.
1326                         This is actually a boot loader parameter; the value is
1327                         passed to the kernel using a special protocol.
1328
1329         vmalloc=nn[KMG] [KNL,BOOT] forces the vmalloc area to have an exact
1330                         size of <nn>. This can be used to increase the
1331                         minimum size (128MB on x86). It can also be used to
1332                         decrease the size and leave more room for directly
1333                         mapped kernel RAM.
1334
1335         vmhalt=         [KNL,S390]
1336
1337         vmpoff=         [KNL,S390]
1338
1339         waveartist=     [HW,OSS]
1340                         Format: <io>,<irq>,<dma>,<dma2>
1341
1342         wd33c93=        [HW,SCSI]
1343                         See header of drivers/scsi/wd33c93.c.
1344
1345         wd7000=         [HW,SCSI]
1346                         See header of drivers/scsi/wd7000.c.
1347
1348         wdt=            [WDT] Watchdog
1349                         See Documentation/watchdog/watchdog.txt.
1350
1351         xd=             [HW,XT] Original XT pre-IDE (RLL encoded) disks.
1352         xd_geo=         See header of drivers/block/xd.c.
1353
1354         xirc2ps_cs=     [NET,PCMCIA]
1355                         Format: <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
1356
1357
1358
1359 Changelog:
1360
1361         The last known update (for 2.4.0) - the changelog was not kept before.
1362         2000-06-??      Mr. Unknown
1363
1364         Update for 2.5.49, description for most of the options introduced,
1365         references to other documentation (C files, READMEs, ..), added S390,
1366         PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and
1367         reformatting.
1368         2002-11-24      Petr Baudis <pasky@ucw.cz>
1369                         Randy Dunlap <randy.dunlap@verizon.net>
1370
1371 TODO:
1372
1373         Add documentation for ALSA options.
1374         Add more DRM drivers.