| 1 | Kernel Parameters |
| 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 | This document may not be entirely up to date and comprehensive. The command |
| 21 | "modinfo -p ${modulename}" shows a current list of all parameters of a loadable |
| 22 | module. Loadable modules, after being loaded into the running kernel, also |
| 23 | reveal their parameters in /sys/module/${modulename}/parameters/. Some of these |
| 24 | parameters may be changed at runtime by the command |
| 25 | "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". |
| 26 | |
| 27 | The parameters listed below are only valid if certain kernel build options were |
| 28 | enabled and if respective hardware is present. The text in square brackets at |
| 29 | the beginning of each description states the restrictions within which a |
| 30 | parameter is applicable: |
| 31 | |
| 32 | ACPI ACPI support is enabled. |
| 33 | ALSA ALSA sound support is enabled. |
| 34 | APIC APIC support is enabled. |
| 35 | APM Advanced Power Management support is enabled. |
| 36 | AX25 Appropriate AX.25 support is enabled. |
| 37 | CD Appropriate CD support is enabled. |
| 38 | DRM Direct Rendering Management support is enabled. |
| 39 | EDD BIOS Enhanced Disk Drive Services (EDD) is enabled |
| 40 | EFI EFI Partitioning (GPT) is enabled |
| 41 | EIDE EIDE/ATAPI support is enabled. |
| 42 | FB The frame buffer device is enabled. |
| 43 | HW Appropriate hardware is enabled. |
| 44 | IA-32 IA-32 aka i386 architecture is enabled. |
| 45 | IA-64 IA-64 architecture is enabled. |
| 46 | IOSCHED More than one I/O scheduler is enabled. |
| 47 | IP_PNP IP DHCP, BOOTP, or RARP is enabled. |
| 48 | ISAPNP ISA PnP code is enabled. |
| 49 | ISDN Appropriate ISDN support is enabled. |
| 50 | JOY Appropriate joystick support is enabled. |
| 51 | LP Printer support is enabled. |
| 52 | LOOP Loopback device support is enabled. |
| 53 | M68k M68k architecture is enabled. |
| 54 | These options have more detailed description inside of |
| 55 | Documentation/m68k/kernel-options.txt. |
| 56 | MCA MCA bus support is enabled. |
| 57 | MDA MDA console support is enabled. |
| 58 | MOUSE Appropriate mouse support is enabled. |
| 59 | MSI Message Signaled Interrupts (PCI). |
| 60 | MTD MTD support is enabled. |
| 61 | NET Appropriate network support is enabled. |
| 62 | NUMA NUMA support is enabled. |
| 63 | GENERIC_TIME The generic timeofday code is enabled. |
| 64 | NFS Appropriate NFS support is enabled. |
| 65 | OSS OSS sound support is enabled. |
| 66 | PARIDE The ParIDE subsystem is enabled. |
| 67 | PARISC The PA-RISC architecture is enabled. |
| 68 | PCI PCI bus support is enabled. |
| 69 | PCMCIA The PCMCIA subsystem is enabled. |
| 70 | PNP Plug & Play support is enabled. |
| 71 | PPC PowerPC architecture is enabled. |
| 72 | PPT Parallel port support is enabled. |
| 73 | PS2 Appropriate PS/2 support is enabled. |
| 74 | RAM RAM disk support is enabled. |
| 75 | S390 S390 architecture is enabled. |
| 76 | SCSI Appropriate SCSI support is enabled. |
| 77 | A lot of drivers has their options described inside of |
| 78 | Documentation/scsi/. |
| 79 | SELINUX SELinux support is enabled. |
| 80 | SERIAL Serial support is enabled. |
| 81 | SMP The kernel is an SMP kernel. |
| 82 | SPARC Sparc architecture is enabled. |
| 83 | SWSUSP Software suspend is enabled. |
| 84 | TS Appropriate touchscreen support is enabled. |
| 85 | USB USB support is enabled. |
| 86 | USBHID USB Human Interface Device support is enabled. |
| 87 | V4L Video For Linux support is enabled. |
| 88 | VGA The VGA console has been enabled. |
| 89 | VT Virtual terminal support is enabled. |
| 90 | WDT Watchdog support is enabled. |
| 91 | XT IBM PC/XT MFM hard disk support is enabled. |
| 92 | X86-64 X86-64 architecture is enabled. |
| 93 | More X86-64 boot options can be found in |
| 94 | Documentation/x86_64/boot-options.txt . |
| 95 | |
| 96 | In addition, the following text indicates that the option: |
| 97 | |
| 98 | BUGS= Relates to possible processor bugs on the said processor. |
| 99 | KNL Is a kernel start-up parameter. |
| 100 | BOOT Is a boot loader parameter. |
| 101 | |
| 102 | Parameters denoted with BOOT are actually interpreted by the boot |
| 103 | loader, and have no meaning to the kernel directly. |
| 104 | Do not modify the syntax of boot loader parameters without extreme |
| 105 | need or coordination with <Documentation/i386/boot.txt>. |
| 106 | |
| 107 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that |
| 108 | a trailing = on the name of any parameter states that that parameter will |
| 109 | be entered as an environment variable, whereas its absence indicates that |
| 110 | it will appear as a kernel argument readable via /proc/cmdline by programs |
| 111 | running once the system is up. |
| 112 | |
| 113 | The number of kernel parameters is not limited, but the length of the |
| 114 | complete command line (parameters including spaces etc.) is limited to |
| 115 | a fixed number of characters. This limit depends on the architecture |
| 116 | and is between 256 and 4096 characters. It is defined in the file |
| 117 | ./include/asm/setup.h as COMMAND_LINE_SIZE. |
| 118 | |
| 119 | |
| 120 | 53c7xx= [HW,SCSI] Amiga SCSI controllers |
| 121 | See header of drivers/scsi/53c7xx.c. |
| 122 | See also Documentation/scsi/ncr53c7xx.txt. |
| 123 | |
| 124 | acpi= [HW,ACPI] Advanced Configuration and Power Interface |
| 125 | Format: { force | off | ht | strict | noirq } |
| 126 | force -- enable ACPI if default was off |
| 127 | off -- disable ACPI if default was on |
| 128 | noirq -- do not use ACPI for IRQ routing |
| 129 | ht -- run only enough ACPI to enable Hyper Threading |
| 130 | strict -- Be less tolerant of platforms that are not |
| 131 | strictly ACPI specification compliant. |
| 132 | |
| 133 | See also Documentation/pm.txt, pci=noacpi |
| 134 | |
| 135 | acpi_sleep= [HW,ACPI] Sleep options |
| 136 | Format: { s3_bios, s3_mode } |
| 137 | See Documentation/power/video.txt |
| 138 | |
| 139 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode |
| 140 | Format: { level | edge | high | low } |
| 141 | |
| 142 | acpi_irq_balance [HW,ACPI] |
| 143 | ACPI will balance active IRQs |
| 144 | default in APIC mode |
| 145 | |
| 146 | acpi_irq_nobalance [HW,ACPI] |
| 147 | ACPI will not move active IRQs (default) |
| 148 | default in PIC mode |
| 149 | |
| 150 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for |
| 151 | use by PCI |
| 152 | Format: <irq>,<irq>... |
| 153 | |
| 154 | acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA |
| 155 | Format: <irq>,<irq>... |
| 156 | |
| 157 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS |
| 158 | Format: To spoof as Windows 98: ="Microsoft Windows" |
| 159 | |
| 160 | acpi_osi= [HW,ACPI] empty param disables _OSI |
| 161 | |
| 162 | acpi_serialize [HW,ACPI] force serialization of AML methods |
| 163 | |
| 164 | acpi_skip_timer_override [HW,ACPI] |
| 165 | Recognize and ignore IRQ0/pin2 Interrupt Override. |
| 166 | For broken nForce2 BIOS resulting in XT-PIC timer. |
| 167 | |
| 168 | acpi_dbg_layer= [HW,ACPI] |
| 169 | Format: <int> |
| 170 | Each bit of the <int> indicates an ACPI debug layer, |
| 171 | 1: enable, 0: disable. It is useful for boot time |
| 172 | debugging. After system has booted up, it can be set |
| 173 | via /proc/acpi/debug_layer. |
| 174 | |
| 175 | acpi_dbg_level= [HW,ACPI] |
| 176 | Format: <int> |
| 177 | Each bit of the <int> indicates an ACPI debug level, |
| 178 | 1: enable, 0: disable. It is useful for boot time |
| 179 | debugging. After system has booted up, it can be set |
| 180 | via /proc/acpi/debug_level. |
| 181 | |
| 182 | acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT |
| 183 | |
| 184 | acpi_generic_hotkey [HW,ACPI] |
| 185 | Allow consolidated generic hotkey driver to |
| 186 | override platform specific driver. |
| 187 | See also Documentation/acpi-hotkey.txt. |
| 188 | |
| 189 | acpi_pm_good [IA-32,X86-64] |
| 190 | Override the pmtimer bug detection: force the kernel |
| 191 | to assume that this machine's pmtimer latches its value |
| 192 | and always returns good values. |
| 193 | |
| 194 | enable_timer_pin_1 [i386,x86-64] |
| 195 | Enable PIN 1 of APIC timer |
| 196 | Can be useful to work around chipset bugs |
| 197 | (in particular on some ATI chipsets). |
| 198 | The kernel tries to set a reasonable default. |
| 199 | |
| 200 | disable_timer_pin_1 [i386,x86-64] |
| 201 | Disable PIN 1 of APIC timer |
| 202 | Can be useful to work around chipset bugs. |
| 203 | |
| 204 | ad1816= [HW,OSS] |
| 205 | Format: <io>,<irq>,<dma>,<dma2> |
| 206 | See also Documentation/sound/oss/AD1816. |
| 207 | |
| 208 | ad1848= [HW,OSS] |
| 209 | Format: <io>,<irq>,<dma>,<dma2>,<type> |
| 210 | |
| 211 | adlib= [HW,OSS] |
| 212 | Format: <io> |
| 213 | |
| 214 | advansys= [HW,SCSI] |
| 215 | See header of drivers/scsi/advansys.c. |
| 216 | |
| 217 | advwdt= [HW,WDT] Advantech WDT |
| 218 | Format: <iostart>,<iostop> |
| 219 | |
| 220 | aedsp16= [HW,OSS] Audio Excel DSP 16 |
| 221 | Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> |
| 222 | See also header of sound/oss/aedsp16.c. |
| 223 | |
| 224 | aha152x= [HW,SCSI] |
| 225 | See Documentation/scsi/aha152x.txt. |
| 226 | |
| 227 | aha1542= [HW,SCSI] |
| 228 | Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] |
| 229 | |
| 230 | aic7xxx= [HW,SCSI] |
| 231 | See Documentation/scsi/aic7xxx.txt. |
| 232 | |
| 233 | aic79xx= [HW,SCSI] |
| 234 | See Documentation/scsi/aic79xx.txt. |
| 235 | |
| 236 | amijoy.map= [HW,JOY] Amiga joystick support |
| 237 | Map of devices attached to JOY0DAT and JOY1DAT |
| 238 | Format: <a>,<b> |
| 239 | See also Documentation/kernel/input/joystick.txt |
| 240 | |
| 241 | analog.map= [HW,JOY] Analog joystick and gamepad support |
| 242 | Specifies type or capabilities of an analog joystick |
| 243 | connected to one of 16 gameports |
| 244 | Format: <type1>,<type2>,..<type16> |
| 245 | |
| 246 | apc= [HW,SPARC] |
| 247 | Power management functions (SPARCstation-4/5 + deriv.) |
| 248 | Format: noidle |
| 249 | Disable APC CPU standby support. SPARCstation-Fox does |
| 250 | not play well with APC CPU idle - disable it if you have |
| 251 | APC and your system crashes randomly. |
| 252 | |
| 253 | apic= [APIC,i386] Change the output verbosity whilst booting |
| 254 | Format: { quiet (default) | verbose | debug } |
| 255 | Change the amount of debugging information output |
| 256 | when initialising the APIC and IO-APIC components. |
| 257 | |
| 258 | apm= [APM] Advanced Power Management |
| 259 | See header of arch/i386/kernel/apm.c. |
| 260 | |
| 261 | applicom= [HW] |
| 262 | Format: <mem>,<irq> |
| 263 | |
| 264 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards |
| 265 | Format: <io>,<irq>,<nodeID> |
| 266 | |
| 267 | ataflop= [HW,M68k] |
| 268 | |
| 269 | atarimouse= [HW,MOUSE] Atari Mouse |
| 270 | |
| 271 | atascsi= [HW,SCSI] Atari SCSI |
| 272 | |
| 273 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, |
| 274 | EzKey and similar keyboards |
| 275 | |
| 276 | atkbd.reset= [HW] Reset keyboard during initialization |
| 277 | |
| 278 | atkbd.set= [HW] Select keyboard code set |
| 279 | Format: <int> (2 = AT (default), 3 = PS/2) |
| 280 | |
| 281 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar |
| 282 | keyboards |
| 283 | |
| 284 | atkbd.softraw= [HW] Choose between synthetic and real raw mode |
| 285 | Format: <bool> (0 = real, 1 = synthetic (default)) |
| 286 | |
| 287 | atkbd.softrepeat= [HW] |
| 288 | Use software keyboard repeat |
| 289 | |
| 290 | autotest [IA64] |
| 291 | |
| 292 | aztcd= [HW,CD] Aztech CD268 CDROM driver |
| 293 | Format: <io>,0x79 (?) |
| 294 | |
| 295 | baycom_epp= [HW,AX25] |
| 296 | Format: <io>,<mode> |
| 297 | |
| 298 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem |
| 299 | Format: <io>,<mode> |
| 300 | See header of drivers/net/hamradio/baycom_par.c. |
| 301 | |
| 302 | baycom_ser_fdx= [HW,AX25] |
| 303 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
| 304 | Format: <io>,<irq>,<mode>[,<baud>] |
| 305 | See header of drivers/net/hamradio/baycom_ser_fdx.c. |
| 306 | |
| 307 | baycom_ser_hdx= [HW,AX25] |
| 308 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
| 309 | Format: <io>,<irq>,<mode> |
| 310 | See header of drivers/net/hamradio/baycom_ser_hdx.c. |
| 311 | |
| 312 | blkmtd_device= [HW,MTD] |
| 313 | blkmtd_erasesz= |
| 314 | blkmtd_ro= |
| 315 | blkmtd_bs= |
| 316 | blkmtd_count= |
| 317 | |
| 318 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
| 319 | bttv.radio= Most important insmod options are available as |
| 320 | kernel args too. |
| 321 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options |
| 322 | bttv.tuner= and Documentation/video4linux/bttv/CARDLIST |
| 323 | |
| 324 | BusLogic= [HW,SCSI] |
| 325 | See drivers/scsi/BusLogic.c, comment before function |
| 326 | BusLogic_ParseDriverOptions(). |
| 327 | |
| 328 | c101= [NET] Moxa C101 synchronous serial card |
| 329 | |
| 330 | cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection. |
| 331 | Sometimes CPU hardware bugs make them report the cache |
| 332 | size incorrectly. The kernel will attempt work arounds |
| 333 | to fix known problems, but for some CPUs it is not |
| 334 | possible to determine what the correct size should be. |
| 335 | This option provides an override for these situations. |
| 336 | |
| 337 | cdu31a= [HW,CD] |
| 338 | Format: <io>,<irq>[,PAS] |
| 339 | See header of drivers/cdrom/cdu31a.c. |
| 340 | |
| 341 | chandev= [HW,NET] Generic channel device initialisation |
| 342 | |
| 343 | checkreqprot [SELINUX] Set initial checkreqprot flag value. |
| 344 | Format: { "0" | "1" } |
| 345 | See security/selinux/Kconfig help text. |
| 346 | 0 -- check protection applied by kernel (includes |
| 347 | any implied execute protection). |
| 348 | 1 -- check protection requested by application. |
| 349 | Default value is set via a kernel config option. |
| 350 | Value can be changed at runtime via |
| 351 | /selinux/checkreqprot. |
| 352 | |
| 353 | clock= [BUGS=IA-32, HW] gettimeofday clocksource override. |
| 354 | [Deprecated] |
| 355 | Forces specified clocksource (if available) to be used |
| 356 | when calculating gettimeofday(). If specified |
| 357 | clocksource is not available, it defaults to PIT. |
| 358 | Format: { pit | tsc | cyclone | pmtmr } |
| 359 | |
| 360 | disable_8254_timer |
| 361 | enable_8254_timer |
| 362 | [IA32/X86_64] Disable/Enable interrupt 0 timer routing |
| 363 | over the 8254 in addition to over the IO-APIC. The |
| 364 | kernel tries to set a sensible default. |
| 365 | |
| 366 | hpet= [IA-32,HPET] option to disable HPET and use PIT. |
| 367 | Format: disable |
| 368 | |
| 369 | cm206= [HW,CD] |
| 370 | Format: { auto | [<io>,][<irq>] } |
| 371 | |
| 372 | com20020= [HW,NET] ARCnet - COM20020 chipset |
| 373 | Format: |
| 374 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
| 375 | |
| 376 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) |
| 377 | Format: <io>[,<irq>] |
| 378 | |
| 379 | com90xx= [HW,NET] |
| 380 | ARCnet - COM90xx chipset (memory-mapped buffers) |
| 381 | Format: <io>[,<irq>[,<memstart>]] |
| 382 | |
| 383 | condev= [HW,S390] console device |
| 384 | conmode= |
| 385 | |
| 386 | console= [KNL] Output console device and options. |
| 387 | |
| 388 | tty<n> Use the virtual console device <n>. |
| 389 | |
| 390 | ttyS<n>[,options] |
| 391 | ttyUSB0[,options] |
| 392 | Use the specified serial port. The options are of |
| 393 | the form "bbbbpnf", where "bbbb" is the baud rate, |
| 394 | "p" is parity ("n", "o", or "e"), "n" is number of |
| 395 | bits, and "f" is flow control ("r" for RTS or |
| 396 | omit it). Default is "9600n8". |
| 397 | |
| 398 | See Documentation/serial-console.txt for more |
| 399 | information. See |
| 400 | Documentation/networking/netconsole.txt for an |
| 401 | alternative. |
| 402 | |
| 403 | uart,io,<addr>[,options] |
| 404 | uart,mmio,<addr>[,options] |
| 405 | Start an early, polled-mode console on the 8250/16550 |
| 406 | UART at the specified I/O port or MMIO address, |
| 407 | switching to the matching ttyS device later. The |
| 408 | options are the same as for ttyS, above. |
| 409 | |
| 410 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
| 411 | Format: |
| 412 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
| 413 | |
| 414 | cpia_pp= [HW,PPT] |
| 415 | Format: { parport<nr> | auto | none } |
| 416 | |
| 417 | crashkernel=nn[KMG]@ss[KMG] |
| 418 | [KNL] Reserve a chunk of physical memory to |
| 419 | hold a kernel to switch to with kexec on panic. |
| 420 | |
| 421 | cs4232= [HW,OSS] |
| 422 | Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq> |
| 423 | |
| 424 | cs89x0_dma= [HW,NET] |
| 425 | Format: <dma> |
| 426 | |
| 427 | cs89x0_media= [HW,NET] |
| 428 | Format: { rj45 | aui | bnc } |
| 429 | |
| 430 | cyclades= [HW,SERIAL] Cyclades multi-serial port adapter. |
| 431 | |
| 432 | dasd= [HW,NET] |
| 433 | See header of drivers/s390/block/dasd_devmap.c. |
| 434 | |
| 435 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port |
| 436 | (one device per port) |
| 437 | Format: <port#>,<type> |
| 438 | See also Documentation/input/joystick-parport.txt |
| 439 | |
| 440 | debug [KNL] Enable kernel debugging (events log level). |
| 441 | |
| 442 | debug_locks_verbose= |
| 443 | [KNL] verbose self-tests |
| 444 | Format=<0|1> |
| 445 | Print debugging info while doing the locking API |
| 446 | self-tests. |
| 447 | We default to 0 (no extra messages), setting it to |
| 448 | 1 will print _a lot_ more information - normally |
| 449 | only useful to kernel developers. |
| 450 | |
| 451 | decnet= [HW,NET] |
| 452 | Format: <area>[,<node>] |
| 453 | See also Documentation/networking/decnet.txt. |
| 454 | |
| 455 | dhash_entries= [KNL] |
| 456 | Set number of hash buckets for dentry cache. |
| 457 | |
| 458 | digi= [HW,SERIAL] |
| 459 | IO parameters + enable/disable command. |
| 460 | |
| 461 | digiepca= [HW,SERIAL] |
| 462 | See drivers/char/README.epca and |
| 463 | Documentation/digiepca.txt. |
| 464 | |
| 465 | dmascc= [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA |
| 466 | support available. |
| 467 | Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]] |
| 468 | |
| 469 | dmasound= [HW,OSS] Sound subsystem buffers |
| 470 | |
| 471 | dscc4.setup= [NET] |
| 472 | |
| 473 | dtc3181e= [HW,SCSI] |
| 474 | |
| 475 | earlyprintk= [IA-32,X86-64] |
| 476 | earlyprintk=vga |
| 477 | earlyprintk=serial[,ttySn[,baudrate]] |
| 478 | |
| 479 | Append ",keep" to not disable it when the real console |
| 480 | takes over. |
| 481 | |
| 482 | Only vga or serial at a time, not both. |
| 483 | |
| 484 | Currently only ttyS0 and ttyS1 are supported. |
| 485 | |
| 486 | Interaction with the standard serial driver is not |
| 487 | very good. |
| 488 | |
| 489 | The VGA output is eventually overwritten by the real |
| 490 | console. |
| 491 | |
| 492 | eata= [HW,SCSI] |
| 493 | |
| 494 | ec_intr= [HW,ACPI] ACPI Embedded Controller interrupt mode |
| 495 | Format: <int> |
| 496 | 0: polling mode |
| 497 | non-0: interrupt mode (default) |
| 498 | |
| 499 | eda= [HW,PS2] |
| 500 | |
| 501 | edb= [HW,PS2] |
| 502 | |
| 503 | edd= [EDD] |
| 504 | Format: {"of[f]" | "sk[ipmbr]"} |
| 505 | See comment in arch/i386/boot/edd.S |
| 506 | |
| 507 | eicon= [HW,ISDN] |
| 508 | Format: <id>,<membase>,<irq> |
| 509 | |
| 510 | eisa_irq_edge= [PARISC,HW] |
| 511 | See header of drivers/parisc/eisa.c. |
| 512 | |
| 513 | elanfreq= [IA-32] |
| 514 | See comment before function elanfreq_setup() in |
| 515 | arch/i386/kernel/cpu/cpufreq/elanfreq.c. |
| 516 | |
| 517 | elevator= [IOSCHED] |
| 518 | Format: {"anticipatory" | "cfq" | "deadline" | "noop"} |
| 519 | See Documentation/block/as-iosched.txt and |
| 520 | Documentation/block/deadline-iosched.txt for details. |
| 521 | |
| 522 | elfcorehdr= [IA-32, X86_64] |
| 523 | Specifies physical address of start of kernel core |
| 524 | image elf header. Generally kexec loader will |
| 525 | pass this option to capture kernel. |
| 526 | See Documentation/kdump/kdump.txt for details. |
| 527 | |
| 528 | enforcing [SELINUX] Set initial enforcing status. |
| 529 | Format: {"0" | "1"} |
| 530 | See security/selinux/Kconfig help text. |
| 531 | 0 -- permissive (log only, no denials). |
| 532 | 1 -- enforcing (deny and log). |
| 533 | Default value is 0. |
| 534 | Value can be changed at runtime via /selinux/enforce. |
| 535 | |
| 536 | es1371= [HW,OSS] |
| 537 | Format: <spdif>,[<nomix>,[<amplifier>]] |
| 538 | See also header of sound/oss/es1371.c. |
| 539 | |
| 540 | ether= [HW,NET] Ethernet cards parameters |
| 541 | This option is obsoleted by the "netdev=" option, which |
| 542 | has equivalent usage. See its documentation for details. |
| 543 | |
| 544 | eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. |
| 545 | Format: <io>[,<irq>] |
| 546 | |
| 547 | fd_mcs= [HW,SCSI] |
| 548 | See header of drivers/scsi/fd_mcs.c. |
| 549 | |
| 550 | fdomain= [HW,SCSI] |
| 551 | See header of drivers/scsi/fdomain.c. |
| 552 | |
| 553 | floppy= [HW] |
| 554 | See Documentation/floppy.txt. |
| 555 | |
| 556 | ftape= [HW] Floppy Tape subsystem debugging options. |
| 557 | See Documentation/ftape.txt. |
| 558 | |
| 559 | gamecon.map[2|3]= |
| 560 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad |
| 561 | support via parallel port (up to 5 devices per port) |
| 562 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> |
| 563 | See also Documentation/input/joystick-parport.txt |
| 564 | |
| 565 | gamma= [HW,DRM] |
| 566 | |
| 567 | gdth= [HW,SCSI] |
| 568 | See header of drivers/scsi/gdth.c. |
| 569 | |
| 570 | gpt [EFI] Forces disk with valid GPT signature but |
| 571 | invalid Protective MBR to be treated as GPT. |
| 572 | |
| 573 | gscd= [HW,CD] |
| 574 | Format: <io> |
| 575 | |
| 576 | gvp11= [HW,SCSI] |
| 577 | |
| 578 | hashdist= [KNL,NUMA] Large hashes allocated during boot |
| 579 | are distributed across NUMA nodes. Defaults on |
| 580 | for IA-64, off otherwise. |
| 581 | Format: 0 | 1 (for off | on) |
| 582 | |
| 583 | hcl= [IA-64] SGI's Hardware Graph compatibility layer |
| 584 | |
| 585 | hd= [EIDE] (E)IDE hard drive subsystem geometry |
| 586 | Format: <cyl>,<head>,<sect> |
| 587 | |
| 588 | hd?= [HW] (E)IDE subsystem |
| 589 | hd?lun= See Documentation/ide.txt. |
| 590 | |
| 591 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact |
| 592 | size of <nn>. This works even on boxes that have no |
| 593 | highmem otherwise. This also works to reduce highmem |
| 594 | size on bigger boxes. |
| 595 | |
| 596 | hisax= [HW,ISDN] |
| 597 | See Documentation/isdn/README.HiSax. |
| 598 | |
| 599 | hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages. |
| 600 | |
| 601 | noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing |
| 602 | |
| 603 | i8042.direct [HW] Put keyboard port into non-translated mode |
| 604 | i8042.dumbkbd [HW] Pretend that controller can only read data from |
| 605 | keyboard and cannot control its state |
| 606 | (Don't attempt to blink the leds) |
| 607 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
| 608 | i8042.nokbd [HW] Don't check/create keyboard port |
| 609 | i8042.nomux [HW] Don't check presence of an active multiplexing |
| 610 | controller |
| 611 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX |
| 612 | controllers |
| 613 | i8042.panicblink= |
| 614 | [HW] Frequency with which keyboard LEDs should blink |
| 615 | when kernel panics (default is 0.5 sec) |
| 616 | i8042.reset [HW] Reset the controller during init and cleanup |
| 617 | i8042.unlock [HW] Unlock (ignore) the keylock |
| 618 | |
| 619 | i810= [HW,DRM] |
| 620 | |
| 621 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
| 622 | indicates that the driver is running on unsupported |
| 623 | hardware. |
| 624 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
| 625 | does not match list of supported models. |
| 626 | i8k.power_status |
| 627 | [HW] Report power status in /proc/i8k |
| 628 | (disabled by default) |
| 629 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN |
| 630 | capability is set. |
| 631 | |
| 632 | ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter |
| 633 | See Documentation/mca.txt. |
| 634 | |
| 635 | icn= [HW,ISDN] |
| 636 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
| 637 | |
| 638 | ide= [HW] (E)IDE subsystem |
| 639 | Format: ide=nodma or ide=doubler or ide=reverse |
| 640 | See Documentation/ide.txt. |
| 641 | |
| 642 | ide?= [HW] (E)IDE subsystem |
| 643 | Format: ide?=noprobe or chipset specific parameters. |
| 644 | See Documentation/ide.txt. |
| 645 | |
| 646 | idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed |
| 647 | See Documentation/ide.txt. |
| 648 | |
| 649 | idle= [HW] |
| 650 | Format: idle=poll or idle=halt |
| 651 | |
| 652 | ihash_entries= [KNL] |
| 653 | Set number of hash buckets for inode cache. |
| 654 | |
| 655 | in2000= [HW,SCSI] |
| 656 | See header of drivers/scsi/in2000.c. |
| 657 | |
| 658 | init= [KNL] |
| 659 | Format: <full_path> |
| 660 | Run specified binary instead of /sbin/init as init |
| 661 | process. |
| 662 | |
| 663 | initcall_debug [KNL] Trace initcalls as they are executed. Useful |
| 664 | for working out where the kernel is dying during |
| 665 | startup. |
| 666 | |
| 667 | initrd= [BOOT] Specify the location of the initial ramdisk |
| 668 | |
| 669 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver |
| 670 | Format: <irq> |
| 671 | |
| 672 | combined_mode= [HW] control which driver uses IDE ports in combined |
| 673 | mode: legacy IDE driver, libata, or both |
| 674 | (in the libata case, libata.atapi_enabled=1 may be |
| 675 | useful as well). Note that using the ide or libata |
| 676 | options may affect your device naming (e.g. by |
| 677 | changing hdc to sdb). |
| 678 | Format: combined (default), ide, or libata |
| 679 | |
| 680 | inttest= [IA64] |
| 681 | |
| 682 | io7= [HW] IO7 for Marvel based alpha systems |
| 683 | See comment before marvel_specify_io7 in |
| 684 | arch/alpha/kernel/core_marvel.c. |
| 685 | |
| 686 | ip= [IP_PNP] |
| 687 | See Documentation/nfsroot.txt. |
| 688 | |
| 689 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
| 690 | See comment before ip2_setup() in drivers/char/ip2.c. |
| 691 | |
| 692 | ips= [HW,SCSI] Adaptec / IBM ServeRAID controller |
| 693 | See header of drivers/scsi/ips.c. |
| 694 | |
| 695 | ports= [IP_VS_FTP] IPVS ftp helper module |
| 696 | Default is 21. |
| 697 | Up to 8 (IP_VS_APP_MAX_PORTS) ports |
| 698 | may be specified. |
| 699 | Format: <port>,<port>.... |
| 700 | |
| 701 | irqfixup [HW] |
| 702 | When an interrupt is not handled search all handlers |
| 703 | for it. Intended to get systems with badly broken |
| 704 | firmware running. |
| 705 | |
| 706 | irqpoll [HW] |
| 707 | When an interrupt is not handled search all handlers |
| 708 | for it. Also check all handlers each timer |
| 709 | interrupt. Intended to get systems with badly broken |
| 710 | firmware running. |
| 711 | |
| 712 | isapnp= [ISAPNP] |
| 713 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
| 714 | |
| 715 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
| 716 | Format: <cpu number>,...,<cpu number> |
| 717 | This option can be used to specify one or more CPUs |
| 718 | to isolate from the general SMP balancing and scheduling |
| 719 | algorithms. The only way to move a process onto or off |
| 720 | an "isolated" CPU is via the CPU affinity syscalls. |
| 721 | <cpu number> begins at 0 and the maximum value is |
| 722 | "number of CPUs in system - 1". |
| 723 | |
| 724 | This option is the preferred way to isolate CPUs. The |
| 725 | alternative -- manually setting the CPU mask of all |
| 726 | tasks in the system -- can cause problems and |
| 727 | suboptimal load balancer performance. |
| 728 | |
| 729 | isp16= [HW,CD] |
| 730 | Format: <io>,<irq>,<dma>,<setup> |
| 731 | |
| 732 | iucv= [HW,NET] |
| 733 | |
| 734 | js= [HW,JOY] Analog joystick |
| 735 | See Documentation/input/joystick.txt. |
| 736 | |
| 737 | keepinitrd [HW,ARM] |
| 738 | |
| 739 | kstack=N [IA-32,X86-64] Print N words from the kernel stack |
| 740 | in oops dumps. |
| 741 | |
| 742 | l2cr= [PPC] |
| 743 | |
| 744 | lapic [IA-32,APIC] Enable the local APIC even if BIOS |
| 745 | disabled it. |
| 746 | |
| 747 | lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip |
| 748 | Format: addr:<io>,irq:<irq> |
| 749 | |
| 750 | llsc*= [IA64] See function print_params() in |
| 751 | arch/ia64/sn/kernel/llsc4.c. |
| 752 | |
| 753 | load_ramdisk= [RAM] List of ramdisks to load from floppy |
| 754 | See Documentation/ramdisk.txt. |
| 755 | |
| 756 | lockd.nlm_grace_period=P [NFS] Assign grace period. |
| 757 | Format: <integer> |
| 758 | |
| 759 | lockd.nlm_tcpport=N [NFS] Assign TCP port. |
| 760 | Format: <integer> |
| 761 | |
| 762 | lockd.nlm_timeout=T [NFS] Assign timeout value. |
| 763 | Format: <integer> |
| 764 | |
| 765 | lockd.nlm_udpport=M [NFS] Assign UDP port. |
| 766 | Format: <integer> |
| 767 | |
| 768 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver |
| 769 | Format: <irq> |
| 770 | |
| 771 | loglevel= All Kernel Messages with a loglevel smaller than the |
| 772 | console loglevel will be printed to the console. It can |
| 773 | also be changed with klogd or other programs. The |
| 774 | loglevels are defined as follows: |
| 775 | |
| 776 | 0 (KERN_EMERG) system is unusable |
| 777 | 1 (KERN_ALERT) action must be taken immediately |
| 778 | 2 (KERN_CRIT) critical conditions |
| 779 | 3 (KERN_ERR) error conditions |
| 780 | 4 (KERN_WARNING) warning conditions |
| 781 | 5 (KERN_NOTICE) normal but significant condition |
| 782 | 6 (KERN_INFO) informational |
| 783 | 7 (KERN_DEBUG) debug-level messages |
| 784 | |
| 785 | log_buf_len=n Sets the size of the printk ring buffer, in bytes. |
| 786 | Format: { n | nk | nM } |
| 787 | n must be a power of two. The default size |
| 788 | is set in the kernel config file. |
| 789 | |
| 790 | lp=0 [LP] Specify parallel ports to use, e.g, |
| 791 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses |
| 792 | lp=reset first parallel port). 'lp=0' disables the |
| 793 | lp=auto printer driver. 'lp=reset' (which can be |
| 794 | specified in addition to the ports) causes |
| 795 | attached printers to be reset. Using |
| 796 | lp=port1,port2,... specifies the parallel ports |
| 797 | to associate lp devices with, starting with |
| 798 | lp0. A port specification may be 'none' to skip |
| 799 | that lp device, or a parport name such as |
| 800 | 'parport0'. Specifying 'lp=auto' instead of a |
| 801 | port specification list means that device IDs |
| 802 | from each port should be examined, to see if |
| 803 | an IEEE 1284-compliant printer is attached; if |
| 804 | so, the driver will manage that printer. |
| 805 | See also header of drivers/char/lp.c. |
| 806 | |
| 807 | lpj=n [KNL] |
| 808 | Sets loops_per_jiffy to given constant, thus avoiding |
| 809 | time-consuming boot-time autodetection (up to 250 ms per |
| 810 | CPU). 0 enables autodetection (default). To determine |
| 811 | the correct value for your kernel, boot with normal |
| 812 | autodetection and see what value is printed. Note that |
| 813 | on SMP systems the preset will be applied to all CPUs, |
| 814 | which is likely to cause problems if your CPUs need |
| 815 | significantly divergent settings. An incorrect value |
| 816 | will cause delays in the kernel to be wrong, leading to |
| 817 | unpredictable I/O errors and other breakage. Although |
| 818 | unlikely, in the extreme case this might damage your |
| 819 | hardware. |
| 820 | |
| 821 | ltpc= [NET] |
| 822 | Format: <io>,<irq>,<dma> |
| 823 | |
| 824 | mac5380= [HW,SCSI] Format: |
| 825 | <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
| 826 | |
| 827 | mac53c9x= [HW,SCSI] Format: |
| 828 | <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
| 829 | |
| 830 | machvec= [IA64] Force the use of a particular machine-vector |
| 831 | (machvec) in a generic kernel. |
| 832 | Example: machvec=hpzx1_swiotlb |
| 833 | |
| 834 | max_loop= [LOOP] Maximum number of loopback devices that can |
| 835 | be mounted |
| 836 | Format: <1-256> |
| 837 | |
| 838 | maxcpus= [SMP] Maximum number of processors that an SMP kernel |
| 839 | should make use of |
| 840 | |
| 841 | max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or |
| 842 | equal to this physical address is ignored. |
| 843 | |
| 844 | max_luns= [SCSI] Maximum number of LUNs to probe. |
| 845 | Should be between 1 and 2^32-1. |
| 846 | |
| 847 | max_report_luns= |
| 848 | [SCSI] Maximum number of LUNs received. |
| 849 | Should be between 1 and 16384. |
| 850 | |
| 851 | mca-pentium [BUGS=IA-32] |
| 852 | |
| 853 | mcatest= [IA-64] |
| 854 | |
| 855 | mcd= [HW,CD] |
| 856 | Format: <port>,<irq>,<mitsumi_bug_93_wait> |
| 857 | |
| 858 | mcdx= [HW,CD] |
| 859 | |
| 860 | mce [IA-32] Machine Check Exception |
| 861 | |
| 862 | md= [HW] RAID subsystems devices and level |
| 863 | See Documentation/md.txt. |
| 864 | |
| 865 | mdacon= [MDA] |
| 866 | Format: <first>,<last> |
| 867 | Specifies range of consoles to be captured by the MDA. |
| 868 | |
| 869 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory |
| 870 | Amount of memory to be used when the kernel is not able |
| 871 | to see the whole system memory or for test. |
| 872 | [IA-32] Use together with memmap= to avoid physical |
| 873 | address space collisions. Without memmap= PCI devices |
| 874 | could be placed at addresses belonging to unused RAM. |
| 875 | |
| 876 | mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel |
| 877 | memory. |
| 878 | |
| 879 | memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact |
| 880 | E820 memory map, as specified by the user. |
| 881 | Such memmap=exactmap lines can be constructed based on |
| 882 | BIOS output or other requirements. See the memmap=nn@ss |
| 883 | option description. |
| 884 | |
| 885 | memmap=nn[KMG]@ss[KMG] |
| 886 | [KNL] Force usage of a specific region of memory |
| 887 | Region of memory to be used, from ss to ss+nn. |
| 888 | |
| 889 | memmap=nn[KMG]#ss[KMG] |
| 890 | [KNL,ACPI] Mark specific memory as ACPI data. |
| 891 | Region of memory to be used, from ss to ss+nn. |
| 892 | |
| 893 | memmap=nn[KMG]$ss[KMG] |
| 894 | [KNL,ACPI] Mark specific memory as reserved. |
| 895 | Region of memory to be used, from ss to ss+nn. |
| 896 | |
| 897 | meye.*= [HW] Set MotionEye Camera parameters |
| 898 | See Documentation/video4linux/meye.txt. |
| 899 | |
| 900 | mga= [HW,DRM] |
| 901 | |
| 902 | migration_cost= |
| 903 | [KNL,SMP] debug: override scheduler migration costs |
| 904 | Format: <level-1-usecs>,<level-2-usecs>,... |
| 905 | This debugging option can be used to override the |
| 906 | default scheduler migration cost matrix. The numbers |
| 907 | are indexed by 'CPU domain distance'. |
| 908 | E.g. migration_cost=1000,2000,3000 on an SMT NUMA |
| 909 | box will set up an intra-core migration cost of |
| 910 | 1 msec, an inter-core migration cost of 2 msecs, |
| 911 | and an inter-node migration cost of 3 msecs. |
| 912 | |
| 913 | WARNING: using the wrong values here can break |
| 914 | scheduler performance, so it's only for scheduler |
| 915 | development purposes, not production environments. |
| 916 | |
| 917 | migration_debug= |
| 918 | [KNL,SMP] migration cost auto-detect verbosity |
| 919 | Format=<0|1|2> |
| 920 | If a system's migration matrix reported at bootup |
| 921 | seems erroneous then this option can be used to |
| 922 | increase verbosity of the detection process. |
| 923 | We default to 0 (no extra messages), 1 will print |
| 924 | some more information, and 2 will be really |
| 925 | verbose (probably only useful if you also have a |
| 926 | serial console attached to the system). |
| 927 | |
| 928 | migration_factor= |
| 929 | [KNL,SMP] multiply/divide migration costs by a factor |
| 930 | Format=<percent> |
| 931 | This debug option can be used to proportionally |
| 932 | increase or decrease the auto-detected migration |
| 933 | costs for all entries of the migration matrix. |
| 934 | E.g. migration_factor=150 will increase migration |
| 935 | costs by 50%. (and thus the scheduler will be less |
| 936 | eager migrating cache-hot tasks) |
| 937 | migration_factor=80 will decrease migration costs |
| 938 | by 20%. (thus the scheduler will be more eager to |
| 939 | migrate tasks) |
| 940 | |
| 941 | WARNING: using the wrong values here can break |
| 942 | scheduler performance, so it's only for scheduler |
| 943 | development purposes, not production environments. |
| 944 | |
| 945 | mousedev.tap_time= |
| 946 | [MOUSE] Maximum time between finger touching and |
| 947 | leaving touchpad surface for touch to be considered |
| 948 | a tap and be reported as a left button click (for |
| 949 | touchpads working in absolute mode only). |
| 950 | Format: <msecs> |
| 951 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices |
| 952 | reporting absolute coordinates, such as tablets |
| 953 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices |
| 954 | reporting absolute coordinates, such as tablets |
| 955 | |
| 956 | mpu401= [HW,OSS] |
| 957 | Format: <io>,<irq> |
| 958 | |
| 959 | MTD_Partition= [MTD] |
| 960 | Format: <name>,<region-number>,<size>,<offset> |
| 961 | |
| 962 | MTD_Region= [MTD] Format: |
| 963 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
| 964 | |
| 965 | mtdparts= [MTD] |
| 966 | See drivers/mtd/cmdline.c. |
| 967 | |
| 968 | mtouchusb.raw_coordinates= |
| 969 | [HW] Make the MicroTouch USB driver use raw coordinates |
| 970 | ('y', default) or cooked coordinates ('n') |
| 971 | |
| 972 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
| 973 | |
| 974 | NCR_D700= [HW,SCSI] |
| 975 | See header of drivers/scsi/NCR_D700.c. |
| 976 | |
| 977 | ncr5380= [HW,SCSI] |
| 978 | |
| 979 | ncr53c400= [HW,SCSI] |
| 980 | |
| 981 | ncr53c400a= [HW,SCSI] |
| 982 | |
| 983 | ncr53c406a= [HW,SCSI] |
| 984 | |
| 985 | ncr53c8xx= [HW,SCSI] |
| 986 | |
| 987 | netdev= [NET] Network devices parameters |
| 988 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> |
| 989 | Note that mem_start is often overloaded to mean |
| 990 | something different and driver-specific. |
| 991 | This usage is only documented in each driver source |
| 992 | file if at all. |
| 993 | |
| 994 | nfsaddrs= [NFS] |
| 995 | See Documentation/nfsroot.txt. |
| 996 | |
| 997 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
| 998 | See Documentation/nfsroot.txt. |
| 999 | |
| 1000 | nfs.callback_tcpport= |
| 1001 | [NFS] set the TCP port on which the NFSv4 callback |
| 1002 | channel should listen. |
| 1003 | |
| 1004 | nfs.idmap_cache_timeout= |
| 1005 | [NFS] set the maximum lifetime for idmapper cache |
| 1006 | entries. |
| 1007 | |
| 1008 | nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels |
| 1009 | |
| 1010 | no387 [BUGS=IA-32] Tells the kernel to use the 387 maths |
| 1011 | emulation library even if a 387 maths coprocessor |
| 1012 | is present. |
| 1013 | |
| 1014 | noalign [KNL,ARM] |
| 1015 | |
| 1016 | noapic [SMP,APIC] Tells the kernel to not make use of any |
| 1017 | IOAPICs that may be present in the system. |
| 1018 | |
| 1019 | noasync [HW,M68K] Disables async and sync negotiation for |
| 1020 | all devices. |
| 1021 | |
| 1022 | nobats [PPC] Do not use BATs for mapping kernel lowmem |
| 1023 | on "Classic" PPC cores. |
| 1024 | |
| 1025 | nocache [ARM] |
| 1026 | |
| 1027 | nodelayacct [KNL] Disable per-task delay accounting |
| 1028 | |
| 1029 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
| 1030 | |
| 1031 | noexec [IA-64] |
| 1032 | |
| 1033 | noexec [IA-32,X86-64] |
| 1034 | noexec=on: enable non-executable mappings (default) |
| 1035 | noexec=off: disable nn-executable mappings |
| 1036 | |
| 1037 | nofxsr [BUGS=IA-32] Disables x86 floating point extended |
| 1038 | register save and restore. The kernel will only save |
| 1039 | legacy floating-point registers on task switch. |
| 1040 | |
| 1041 | nohlt [BUGS=ARM] |
| 1042 | |
| 1043 | no-hlt [BUGS=IA-32] Tells the kernel that the hlt |
| 1044 | instruction doesn't work correctly and not to |
| 1045 | use it. |
| 1046 | |
| 1047 | nohalt [IA-64] Tells the kernel not to use the power saving |
| 1048 | function PAL_HALT_LIGHT when idle. This increases |
| 1049 | power-consumption. On the positive side, it reduces |
| 1050 | interrupt wake-up latency, which may improve performance |
| 1051 | in certain environments such as networked servers or |
| 1052 | real-time systems. |
| 1053 | |
| 1054 | noirqdebug [IA-32] Disables the code which attempts to detect and |
| 1055 | disable unhandled interrupt sources. |
| 1056 | |
| 1057 | noisapnp [ISAPNP] Disables ISA PnP code. |
| 1058 | |
| 1059 | noinitrd [RAM] Tells the kernel not to load any configured |
| 1060 | initial RAM disk. |
| 1061 | |
| 1062 | nointroute [IA-64] |
| 1063 | |
| 1064 | nolapic [IA-32,APIC] Do not enable or use the local APIC. |
| 1065 | |
| 1066 | noltlbs [PPC] Do not use large page/tlb entries for kernel |
| 1067 | lowmem mapping on PPC40x. |
| 1068 | |
| 1069 | nomca [IA-64] Disable machine check abort handling |
| 1070 | |
| 1071 | nomce [IA-32] Machine Check Exception |
| 1072 | |
| 1073 | noresidual [PPC] Don't use residual data on PReP machines. |
| 1074 | |
| 1075 | noresume [SWSUSP] Disables resume and restores original swap |
| 1076 | space. |
| 1077 | |
| 1078 | no-scroll [VGA] Disables scrollback. |
| 1079 | This is required for the Braillex ib80-piezo Braille |
| 1080 | reader made by F.H. Papenmeier (Germany). |
| 1081 | |
| 1082 | nosbagart [IA-64] |
| 1083 | |
| 1084 | nosep [BUGS=IA-32] Disables x86 SYSENTER/SYSEXIT support. |
| 1085 | |
| 1086 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel. |
| 1087 | |
| 1088 | nosync [HW,M68K] Disables sync negotiation for all devices. |
| 1089 | |
| 1090 | notsc [BUGS=IA-32] Disable Time Stamp Counter |
| 1091 | |
| 1092 | nousb [USB] Disable the USB subsystem |
| 1093 | |
| 1094 | nowb [ARM] |
| 1095 | |
| 1096 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
| 1097 | |
| 1098 | opl3= [HW,OSS] |
| 1099 | Format: <io> |
| 1100 | |
| 1101 | opl3sa2= [HW,OSS] Format: |
| 1102 | <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple] |
| 1103 | |
| 1104 | oprofile.timer= [HW] |
| 1105 | Use timer interrupt instead of performance counters |
| 1106 | |
| 1107 | optcd= [HW,CD] |
| 1108 | Format: <io> |
| 1109 | |
| 1110 | osst= [HW,SCSI] SCSI Tape Driver |
| 1111 | Format: <buffer_size>,<write_threshold> |
| 1112 | See also Documentation/scsi/st.txt. |
| 1113 | |
| 1114 | panic= [KNL] Kernel behaviour on panic |
| 1115 | Format: <timeout> |
| 1116 | |
| 1117 | parkbd.port= [HW] Parallel port number the keyboard adapter is |
| 1118 | connected to, default is 0. |
| 1119 | Format: <parport#> |
| 1120 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, |
| 1121 | 0 for XT, 1 for AT (default is AT). |
| 1122 | Format: <mode> |
| 1123 | |
| 1124 | parport= [HW,PPT] Specify parallel ports. 0 disables. |
| 1125 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } |
| 1126 | Use 'auto' to force the driver to use any |
| 1127 | IRQ/DMA settings detected (the default is to |
| 1128 | ignore detected IRQ/DMA settings because of |
| 1129 | possible conflicts). You can specify the base |
| 1130 | address, IRQ, and DMA settings; IRQ and DMA |
| 1131 | should be numbers, or 'auto' (for using detected |
| 1132 | settings on that particular port), or 'nofifo' |
| 1133 | (to avoid using a FIFO even if it is detected). |
| 1134 | Parallel ports are assigned in the order they |
| 1135 | are specified on the command line, starting |
| 1136 | with parport0. |
| 1137 | |
| 1138 | parport_init_mode= [HW,PPT] |
| 1139 | Configure VIA parallel port to operate in |
| 1140 | a specific mode. This is necessary on Pegasos |
| 1141 | computer where firmware has no options for setting |
| 1142 | up parallel port mode and sets it to spp. |
| 1143 | Currently this function knows 686a and 8231 chips. |
| 1144 | Format: [spp|ps2|epp|ecp|ecpepp] |
| 1145 | |
| 1146 | pas2= [HW,OSS] Format: |
| 1147 | <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> |
| 1148 | |
| 1149 | pas16= [HW,SCSI] |
| 1150 | See header of drivers/scsi/pas16.c. |
| 1151 | |
| 1152 | pause_on_oops= |
| 1153 | Halt all CPUs after the first oops has been printed for |
| 1154 | the specified number of seconds. This is to be used if |
| 1155 | your oopses keep scrolling off the screen. |
| 1156 | |
| 1157 | pcbit= [HW,ISDN] |
| 1158 | |
| 1159 | pcd. [PARIDE] |
| 1160 | See header of drivers/block/paride/pcd.c. |
| 1161 | See also Documentation/paride.txt. |
| 1162 | |
| 1163 | pci=option[,option...] [PCI] various PCI subsystem options: |
| 1164 | off [IA-32] don't probe for the PCI bus |
| 1165 | bios [IA-32] force use of PCI BIOS, don't access |
| 1166 | the hardware directly. Use this if your machine |
| 1167 | has a non-standard PCI host bridge. |
| 1168 | nobios [IA-32] disallow use of PCI BIOS, only direct |
| 1169 | hardware access methods are allowed. Use this |
| 1170 | if you experience crashes upon bootup and you |
| 1171 | suspect they are caused by the BIOS. |
| 1172 | conf1 [IA-32] Force use of PCI Configuration |
| 1173 | Mechanism 1. |
| 1174 | conf2 [IA-32] Force use of PCI Configuration |
| 1175 | Mechanism 2. |
| 1176 | nommconf [IA-32,X86_64] Disable use of MMCONFIG for PCI |
| 1177 | Configuration |
| 1178 | nomsi [MSI] If the PCI_MSI kernel config parameter is |
| 1179 | enabled, this kernel boot option can be used to |
| 1180 | disable the use of MSI interrupts system-wide. |
| 1181 | nosort [IA-32] Don't sort PCI devices according to |
| 1182 | order given by the PCI BIOS. This sorting is |
| 1183 | done to get a device order compatible with |
| 1184 | older kernels. |
| 1185 | biosirq [IA-32] Use PCI BIOS calls to get the interrupt |
| 1186 | routing table. These calls are known to be buggy |
| 1187 | on several machines and they hang the machine |
| 1188 | when used, but on other computers it's the only |
| 1189 | way to get the interrupt routing table. Try |
| 1190 | this option if the kernel is unable to allocate |
| 1191 | IRQs or discover secondary PCI buses on your |
| 1192 | motherboard. |
| 1193 | rom [IA-32] Assign address space to expansion ROMs. |
| 1194 | Use with caution as certain devices share |
| 1195 | address decoders between ROMs and other |
| 1196 | resources. |
| 1197 | irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be |
| 1198 | assigned automatically to PCI devices. You can |
| 1199 | make the kernel exclude IRQs of your ISA cards |
| 1200 | this way. |
| 1201 | pirqaddr=0xAAAAA [IA-32] Specify the physical address |
| 1202 | of the PIRQ table (normally generated |
| 1203 | by the BIOS) if it is outside the |
| 1204 | F0000h-100000h range. |
| 1205 | lastbus=N [IA-32] Scan all buses thru bus #N. Can be |
| 1206 | useful if the kernel is unable to find your |
| 1207 | secondary buses and you want to tell it |
| 1208 | explicitly which ones they are. |
| 1209 | assign-busses [IA-32] Always assign all PCI bus |
| 1210 | numbers ourselves, overriding |
| 1211 | whatever the firmware may have done. |
| 1212 | usepirqmask [IA-32] Honor the possible IRQ mask stored |
| 1213 | in the BIOS $PIR table. This is needed on |
| 1214 | some systems with broken BIOSes, notably |
| 1215 | some HP Pavilion N5400 and Omnibook XE3 |
| 1216 | notebooks. This will have no effect if ACPI |
| 1217 | IRQ routing is enabled. |
| 1218 | noacpi [IA-32] Do not use ACPI for IRQ routing |
| 1219 | or for PCI scanning. |
| 1220 | routeirq Do IRQ routing for all PCI devices. |
| 1221 | This is normally done in pci_enable_device(), |
| 1222 | so this option is a temporary workaround |
| 1223 | for broken drivers that don't call it. |
| 1224 | firmware [ARM] Do not re-enumerate the bus but instead |
| 1225 | just use the configuration from the |
| 1226 | bootloader. This is currently used on |
| 1227 | IXP2000 systems where the bus has to be |
| 1228 | configured a certain way for adjunct CPUs. |
| 1229 | noearly [X86] Don't do any early type 1 scanning. |
| 1230 | This might help on some broken boards which |
| 1231 | machine check when some devices' config space |
| 1232 | is read. But various workarounds are disabled |
| 1233 | and some IOMMU drivers will not work. |
| 1234 | bfsort Sort PCI devices into breadth-first order. |
| 1235 | This sorting is done to get a device |
| 1236 | order compatible with older (<= 2.4) kernels. |
| 1237 | nobfsort Don't sort PCI devices into breadth-first order. |
| 1238 | |
| 1239 | pcmv= [HW,PCMCIA] BadgePAD 4 |
| 1240 | |
| 1241 | pd. [PARIDE] |
| 1242 | See Documentation/paride.txt. |
| 1243 | |
| 1244 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at |
| 1245 | boot time. |
| 1246 | Format: { 0 | 1 } |
| 1247 | See arch/parisc/kernel/pdc_chassis.c |
| 1248 | |
| 1249 | pf. [PARIDE] |
| 1250 | See Documentation/paride.txt. |
| 1251 | |
| 1252 | pg. [PARIDE] |
| 1253 | See Documentation/paride.txt. |
| 1254 | |
| 1255 | pirq= [SMP,APIC] Manual mp-table setup |
| 1256 | See Documentation/i386/IO-APIC.txt. |
| 1257 | |
| 1258 | plip= [PPT,NET] Parallel port network link |
| 1259 | Format: { parport<nr> | timid | 0 } |
| 1260 | See also Documentation/parport.txt. |
| 1261 | |
| 1262 | pnpacpi= [ACPI] |
| 1263 | { off } |
| 1264 | |
| 1265 | pnpbios= [ISAPNP] |
| 1266 | { on | off | curr | res | no-curr | no-res } |
| 1267 | |
| 1268 | pnp_reserve_irq= |
| 1269 | [ISAPNP] Exclude IRQs for the autoconfiguration |
| 1270 | |
| 1271 | pnp_reserve_dma= |
| 1272 | [ISAPNP] Exclude DMAs for the autoconfiguration |
| 1273 | |
| 1274 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
| 1275 | Ranges are in pairs (I/O port base and size). |
| 1276 | |
| 1277 | pnp_reserve_mem= |
| 1278 | [ISAPNP] Exclude memory regions for the |
| 1279 | autoconfiguration. |
| 1280 | Ranges are in pairs (memory base and size). |
| 1281 | |
| 1282 | profile= [KNL] Enable kernel profiling via /proc/profile |
| 1283 | Format: [schedule,]<number> |
| 1284 | Param: "schedule" - profile schedule points. |
| 1285 | Param: <number> - step/bucket size as a power of 2 for |
| 1286 | statistical time based profiling. |
| 1287 | |
| 1288 | processor.max_cstate= [HW,ACPI] |
| 1289 | Limit processor to maximum C-state |
| 1290 | max_cstate=9 overrides any DMI blacklist limit. |
| 1291 | |
| 1292 | processor.nocst [HW,ACPI] |
| 1293 | Ignore the _CST method to determine C-states, |
| 1294 | instead using the legacy FADT method |
| 1295 | |
| 1296 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk |
| 1297 | before loading. |
| 1298 | See Documentation/ramdisk.txt. |
| 1299 | |
| 1300 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to |
| 1301 | probe for; one of (bare|imps|exps|lifebook|any). |
| 1302 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports |
| 1303 | per second. |
| 1304 | psmouse.resetafter= [HW,MOUSE] |
| 1305 | Try to reset the device after so many bad packets |
| 1306 | (0 = never). |
| 1307 | psmouse.resolution= |
| 1308 | [HW,MOUSE] Set desired mouse resolution, in dpi. |
| 1309 | psmouse.smartscroll= |
| 1310 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. |
| 1311 | 0 = disabled, 1 = enabled (default). |
| 1312 | |
| 1313 | pss= [HW,OSS] Personal Sound System (ECHO ESC614) |
| 1314 | Format: |
| 1315 | <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> |
| 1316 | |
| 1317 | pt. [PARIDE] |
| 1318 | See Documentation/paride.txt. |
| 1319 | |
| 1320 | quiet [KNL] Disable most log messages |
| 1321 | |
| 1322 | r128= [HW,DRM] |
| 1323 | |
| 1324 | raid= [HW,RAID] |
| 1325 | See Documentation/md.txt. |
| 1326 | |
| 1327 | ramdisk= [RAM] Sizes of RAM disks in kilobytes [deprecated] |
| 1328 | See Documentation/ramdisk.txt. |
| 1329 | |
| 1330 | ramdisk_blocksize= [RAM] |
| 1331 | See Documentation/ramdisk.txt. |
| 1332 | |
| 1333 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
| 1334 | New name for the ramdisk parameter. |
| 1335 | See Documentation/ramdisk.txt. |
| 1336 | |
| 1337 | rcu.blimit= [KNL,BOOT] Set maximum number of finished |
| 1338 | RCU callbacks to process in one batch. |
| 1339 | |
| 1340 | rcu.qhimark= [KNL,BOOT] Set threshold of queued |
| 1341 | RCU callbacks over which batch limiting is disabled. |
| 1342 | |
| 1343 | rcu.qlowmark= [KNL,BOOT] Set threshold of queued |
| 1344 | RCU callbacks below which batch limiting is re-enabled. |
| 1345 | |
| 1346 | rdinit= [KNL] |
| 1347 | Format: <full_path> |
| 1348 | Run specified binary instead of /init from the ramdisk, |
| 1349 | used for early userspace startup. See initrd. |
| 1350 | |
| 1351 | reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
| 1352 | Format: <reboot_mode>[,<reboot_mode2>[,...]] |
| 1353 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
| 1354 | |
| 1355 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
| 1356 | |
| 1357 | reservetop= [IA-32] |
| 1358 | Format: nn[KMG] |
| 1359 | Reserves a hole at the top of the kernel virtual |
| 1360 | address space. |
| 1361 | |
| 1362 | reset_devices [KNL] Force drivers to reset the underlying device |
| 1363 | during initialization. |
| 1364 | |
| 1365 | resume= [SWSUSP] |
| 1366 | Specify the partition device for software suspend |
| 1367 | |
| 1368 | rhash_entries= [KNL,NET] |
| 1369 | Set number of hash buckets for route cache |
| 1370 | |
| 1371 | riscom8= [HW,SERIAL] |
| 1372 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] |
| 1373 | |
| 1374 | ro [KNL] Mount root device read-only on boot |
| 1375 | |
| 1376 | root= [KNL] Root filesystem |
| 1377 | |
| 1378 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
| 1379 | mount the root filesystem |
| 1380 | |
| 1381 | rootflags= [KNL] Set root filesystem mount option string |
| 1382 | |
| 1383 | rootfstype= [KNL] Set root filesystem type |
| 1384 | |
| 1385 | rw [KNL] Mount root device read-write on boot |
| 1386 | |
| 1387 | S [KNL] Run init in single mode |
| 1388 | |
| 1389 | sa1100ir [NET] |
| 1390 | See drivers/net/irda/sa1100_ir.c. |
| 1391 | |
| 1392 | sb= [HW,OSS] |
| 1393 | Format: <io>,<irq>,<dma>,<dma2> |
| 1394 | |
| 1395 | sbni= [NET] Granch SBNI12 leased line adapter |
| 1396 | |
| 1397 | sbpcd= [HW,CD] Soundblaster CD adapter |
| 1398 | Format: <io>,<type> |
| 1399 | See a comment before function sbpcd_setup() in |
| 1400 | drivers/cdrom/sbpcd.c. |
| 1401 | |
| 1402 | sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver |
| 1403 | Format: <io>[,<timeout>[,<isapnp>]] |
| 1404 | |
| 1405 | scsi_debug_*= [SCSI] |
| 1406 | See drivers/scsi/scsi_debug.c. |
| 1407 | |
| 1408 | scsi_default_dev_flags= |
| 1409 | [SCSI] SCSI default device flags |
| 1410 | Format: <integer> |
| 1411 | |
| 1412 | scsi_dev_flags= [SCSI] Black/white list entry for vendor and model |
| 1413 | Format: <vendor>:<model>:<flags> |
| 1414 | (flags are integer value) |
| 1415 | |
| 1416 | scsi_logging= [SCSI] |
| 1417 | |
| 1418 | selinux [SELINUX] Disable or enable SELinux at boot time. |
| 1419 | Format: { "0" | "1" } |
| 1420 | See security/selinux/Kconfig help text. |
| 1421 | 0 -- disable. |
| 1422 | 1 -- enable. |
| 1423 | Default value is set via kernel config option. |
| 1424 | If enabled at boot time, /selinux/disable can be used |
| 1425 | later to disable prior to initial policy load. |
| 1426 | |
| 1427 | selinux_compat_net = |
| 1428 | [SELINUX] Set initial selinux_compat_net flag value. |
| 1429 | Format: { "0" | "1" } |
| 1430 | 0 -- use new secmark-based packet controls |
| 1431 | 1 -- use legacy packet controls |
| 1432 | Default value is 0 (preferred). |
| 1433 | Value can be changed at runtime via |
| 1434 | /selinux/compat_net. |
| 1435 | |
| 1436 | serialnumber [BUGS=IA-32] |
| 1437 | |
| 1438 | sg_def_reserved_size= [SCSI] |
| 1439 | |
| 1440 | shapers= [NET] |
| 1441 | Maximal number of shapers. |
| 1442 | |
| 1443 | sim710= [SCSI,HW] |
| 1444 | See header of drivers/scsi/sim710.c. |
| 1445 | |
| 1446 | simeth= [IA-64] |
| 1447 | simscsi= |
| 1448 | |
| 1449 | sjcd= [HW,CD] |
| 1450 | Format: <io>,<irq>,<dma> |
| 1451 | See header of drivers/cdrom/sjcd.c. |
| 1452 | |
| 1453 | slram= [HW,MTD] |
| 1454 | |
| 1455 | smart2= [HW] |
| 1456 | Format: <io1>[,<io2>[,...,<io8>]] |
| 1457 | |
| 1458 | snd-ad1816a= [HW,ALSA] |
| 1459 | |
| 1460 | snd-ad1848= [HW,ALSA] |
| 1461 | |
| 1462 | snd-ali5451= [HW,ALSA] |
| 1463 | |
| 1464 | snd-als100= [HW,ALSA] |
| 1465 | |
| 1466 | snd-als4000= [HW,ALSA] |
| 1467 | |
| 1468 | snd-azt2320= [HW,ALSA] |
| 1469 | |
| 1470 | snd-cmi8330= [HW,ALSA] |
| 1471 | |
| 1472 | snd-cmipci= [HW,ALSA] |
| 1473 | |
| 1474 | snd-cs4231= [HW,ALSA] |
| 1475 | |
| 1476 | snd-cs4232= [HW,ALSA] |
| 1477 | |
| 1478 | snd-cs4236= [HW,ALSA] |
| 1479 | |
| 1480 | snd-cs4281= [HW,ALSA] |
| 1481 | |
| 1482 | snd-cs46xx= [HW,ALSA] |
| 1483 | |
| 1484 | snd-dt019x= [HW,ALSA] |
| 1485 | |
| 1486 | snd-dummy= [HW,ALSA] |
| 1487 | |
| 1488 | snd-emu10k1= [HW,ALSA] |
| 1489 | |
| 1490 | snd-ens1370= [HW,ALSA] |
| 1491 | |
| 1492 | snd-ens1371= [HW,ALSA] |
| 1493 | |
| 1494 | snd-es968= [HW,ALSA] |
| 1495 | |
| 1496 | snd-es1688= [HW,ALSA] |
| 1497 | |
| 1498 | snd-es18xx= [HW,ALSA] |
| 1499 | |
| 1500 | snd-es1938= [HW,ALSA] |
| 1501 | |
| 1502 | snd-es1968= [HW,ALSA] |
| 1503 | |
| 1504 | snd-fm801= [HW,ALSA] |
| 1505 | |
| 1506 | snd-gusclassic= [HW,ALSA] |
| 1507 | |
| 1508 | snd-gusextreme= [HW,ALSA] |
| 1509 | |
| 1510 | snd-gusmax= [HW,ALSA] |
| 1511 | |
| 1512 | snd-hdsp= [HW,ALSA] |
| 1513 | |
| 1514 | snd-ice1712= [HW,ALSA] |
| 1515 | |
| 1516 | snd-intel8x0= [HW,ALSA] |
| 1517 | |
| 1518 | snd-interwave= [HW,ALSA] |
| 1519 | |
| 1520 | snd-interwave-stb= |
| 1521 | [HW,ALSA] |
| 1522 | |
| 1523 | snd-korg1212= [HW,ALSA] |
| 1524 | |
| 1525 | snd-maestro3= [HW,ALSA] |
| 1526 | |
| 1527 | snd-mpu401= [HW,ALSA] |
| 1528 | |
| 1529 | snd-mtpav= [HW,ALSA] |
| 1530 | |
| 1531 | snd-nm256= [HW,ALSA] |
| 1532 | |
| 1533 | snd-opl3sa2= [HW,ALSA] |
| 1534 | |
| 1535 | snd-opti92x-ad1848= |
| 1536 | [HW,ALSA] |
| 1537 | |
| 1538 | snd-opti92x-cs4231= |
| 1539 | [HW,ALSA] |
| 1540 | |
| 1541 | snd-opti93x= [HW,ALSA] |
| 1542 | |
| 1543 | snd-pmac= [HW,ALSA] |
| 1544 | |
| 1545 | snd-rme32= [HW,ALSA] |
| 1546 | |
| 1547 | snd-rme96= [HW,ALSA] |
| 1548 | |
| 1549 | snd-rme9652= [HW,ALSA] |
| 1550 | |
| 1551 | snd-sb8= [HW,ALSA] |
| 1552 | |
| 1553 | snd-sb16= [HW,ALSA] |
| 1554 | |
| 1555 | snd-sbawe= [HW,ALSA] |
| 1556 | |
| 1557 | snd-serial= [HW,ALSA] |
| 1558 | |
| 1559 | snd-sgalaxy= [HW,ALSA] |
| 1560 | |
| 1561 | snd-sonicvibes= [HW,ALSA] |
| 1562 | |
| 1563 | snd-sun-amd7930= |
| 1564 | [HW,ALSA] |
| 1565 | |
| 1566 | snd-sun-cs4231= [HW,ALSA] |
| 1567 | |
| 1568 | snd-trident= [HW,ALSA] |
| 1569 | |
| 1570 | snd-usb-audio= [HW,ALSA,USB] |
| 1571 | |
| 1572 | snd-via82xx= [HW,ALSA] |
| 1573 | |
| 1574 | snd-virmidi= [HW,ALSA] |
| 1575 | |
| 1576 | snd-wavefront= [HW,ALSA] |
| 1577 | |
| 1578 | snd-ymfpci= [HW,ALSA] |
| 1579 | |
| 1580 | sonycd535= [HW,CD] |
| 1581 | Format: <io>[,<irq>] |
| 1582 | |
| 1583 | sonypi.*= [HW] Sony Programmable I/O Control Device driver |
| 1584 | See Documentation/sonypi.txt |
| 1585 | |
| 1586 | specialix= [HW,SERIAL] Specialix multi-serial port adapter |
| 1587 | See Documentation/specialix.txt. |
| 1588 | |
| 1589 | spia_io_base= [HW,MTD] |
| 1590 | spia_fio_base= |
| 1591 | spia_pedr= |
| 1592 | spia_peddr= |
| 1593 | |
| 1594 | sscape= [HW,OSS] |
| 1595 | Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> |
| 1596 | |
| 1597 | st= [HW,SCSI] SCSI tape parameters (buffers, etc.) |
| 1598 | See Documentation/scsi/st.txt. |
| 1599 | |
| 1600 | st0x= [HW,SCSI] |
| 1601 | See header of drivers/scsi/seagate.c. |
| 1602 | |
| 1603 | sti= [PARISC,HW] |
| 1604 | Format: <num> |
| 1605 | Set the STI (builtin display/keyboard on the HP-PARISC |
| 1606 | machines) console (graphic card) which should be used |
| 1607 | as the initial boot-console. |
| 1608 | See also comment in drivers/video/console/sticore.c. |
| 1609 | |
| 1610 | sti_font= [HW] |
| 1611 | See comment in drivers/video/console/sticore.c. |
| 1612 | |
| 1613 | stifb= [HW] |
| 1614 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
| 1615 | |
| 1616 | swiotlb= [IA-64] Number of I/O TLB slabs |
| 1617 | |
| 1618 | switches= [HW,M68k] |
| 1619 | |
| 1620 | sym53c416= [HW,SCSI] |
| 1621 | See header of drivers/scsi/sym53c416.c. |
| 1622 | |
| 1623 | t128= [HW,SCSI] |
| 1624 | See header of drivers/scsi/t128.c. |
| 1625 | |
| 1626 | tdfx= [HW,DRM] |
| 1627 | |
| 1628 | thash_entries= [KNL,NET] |
| 1629 | Set number of hash buckets for TCP connection |
| 1630 | |
| 1631 | time Show timing data prefixed to each printk message line |
| 1632 | |
| 1633 | clocksource= [GENERIC_TIME] Override the default clocksource |
| 1634 | Override the default clocksource and use the clocksource |
| 1635 | with the name specified. |
| 1636 | |
| 1637 | tipar.timeout= [HW,PPT] |
| 1638 | Set communications timeout in tenths of a second |
| 1639 | (default 15). |
| 1640 | |
| 1641 | tipar.delay= [HW,PPT] |
| 1642 | Set inter-bit delay in microseconds (default 10). |
| 1643 | |
| 1644 | tmc8xx= [HW,SCSI] |
| 1645 | See header of drivers/scsi/seagate.c. |
| 1646 | |
| 1647 | tmscsim= [HW,SCSI] |
| 1648 | See comment before function dc390_setup() in |
| 1649 | drivers/scsi/tmscsim.c. |
| 1650 | |
| 1651 | tp720= [HW,PS2] |
| 1652 | |
| 1653 | trix= [HW,OSS] MediaTrix AudioTrix Pro |
| 1654 | Format: |
| 1655 | <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> |
| 1656 | |
| 1657 | tsdev.xres= [TS] Horizontal screen resolution. |
| 1658 | tsdev.yres= [TS] Vertical screen resolution. |
| 1659 | |
| 1660 | turbografx.map[2|3]= [HW,JOY] |
| 1661 | TurboGraFX parallel port interface |
| 1662 | Format: |
| 1663 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
| 1664 | See also Documentation/input/joystick-parport.txt |
| 1665 | |
| 1666 | u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter |
| 1667 | See header of drivers/scsi/u14-34f.c. |
| 1668 | |
| 1669 | uart401= [HW,OSS] |
| 1670 | Format: <io>,<irq> |
| 1671 | |
| 1672 | uart6850= [HW,OSS] |
| 1673 | Format: <io>,<irq> |
| 1674 | |
| 1675 | usbhid.mousepoll= |
| 1676 | [USBHID] The interval which mice are to be polled at. |
| 1677 | |
| 1678 | vdso= [IA-32] |
| 1679 | vdso=1: enable VDSO (default) |
| 1680 | vdso=0: disable VDSO mapping |
| 1681 | |
| 1682 | video= [FB] Frame buffer configuration |
| 1683 | See Documentation/fb/modedb.txt. |
| 1684 | |
| 1685 | vga= [BOOT,IA-32] Select a particular video mode |
| 1686 | See Documentation/i386/boot.txt and |
| 1687 | Documentation/svga.txt. |
| 1688 | Use vga=ask for menu. |
| 1689 | This is actually a boot loader parameter; the value is |
| 1690 | passed to the kernel using a special protocol. |
| 1691 | |
| 1692 | vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
| 1693 | size of <nn>. This can be used to increase the |
| 1694 | minimum size (128MB on x86). It can also be used to |
| 1695 | decrease the size and leave more room for directly |
| 1696 | mapped kernel RAM. |
| 1697 | |
| 1698 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. |
| 1699 | Format: <command> |
| 1700 | |
| 1701 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. |
| 1702 | Format: <command> |
| 1703 | |
| 1704 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. |
| 1705 | Format: <command> |
| 1706 | |
| 1707 | waveartist= [HW,OSS] |
| 1708 | Format: <io>,<irq>,<dma>,<dma2> |
| 1709 | |
| 1710 | wd33c93= [HW,SCSI] |
| 1711 | See header of drivers/scsi/wd33c93.c. |
| 1712 | |
| 1713 | wd7000= [HW,SCSI] |
| 1714 | See header of drivers/scsi/wd7000.c. |
| 1715 | |
| 1716 | wdt= [WDT] Watchdog |
| 1717 | See Documentation/watchdog/watchdog.txt. |
| 1718 | |
| 1719 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. |
| 1720 | xd_geo= See header of drivers/block/xd.c. |
| 1721 | |
| 1722 | xirc2ps_cs= [NET,PCMCIA] |
| 1723 | Format: |
| 1724 | <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
| 1725 | |
| 1726 | norandmaps Don't use address space randomization |
| 1727 | Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space |
| 1728 | |
| 1729 | |
| 1730 | ______________________________________________________________________ |
| 1731 | |
| 1732 | TODO: |
| 1733 | |
| 1734 | Add documentation for ALSA options. |
| 1735 | Add more DRM drivers. |