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Linus Torvalds1da177e2005-04-16 15:20:36 -07001February 2003 Kernel Parameters v2.5.59
2 ~~~~~~~~~~~~~~~~~
3
4The 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
7case insensitive manner), and with descriptions where known.
8
9Module parameters for loadable modules are specified only as the
10parameter name with optional '=' and value as appropriate, such as:
11
12 modprobe usbcore blinkenlights=1
13
14Module parameters for modules that are built into the kernel image
15are 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
Randy Dunlapa9913042005-10-23 12:57:11 -070020The text in square brackets at the beginning of the description states the
Linus Torvalds1da177e2005-04-16 15:20:36 -070021restrictions on the kernel for the said kernel parameter to be valid. The
22restrictions 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.
Randy Dunlapa9913042005-10-23 12:57:11 -070030 DEVFS devfs support is enabled.
31 DRM Direct Rendering Management support is enabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 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.
Adrian Bunk41e2e8b2005-07-12 13:58:33 -070040 IP_PNP IP DHCP, BOOTP, or RARP is enabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 ISAPNP ISA PnP code is enabled.
42 ISDN Appropriate ISDN support is enabled.
43 JOY Appropriate joystick support is enabled.
44 LP Printer support is enabled.
45 LOOP Loopback device support is enabled.
46 M68k M68k architecture is enabled.
47 These options have more detailed description inside of
48 Documentation/m68k/kernel-options.txt.
49 MCA MCA bus support is enabled.
50 MDA MDA console support is enabled.
51 MOUSE Appropriate mouse support is enabled.
52 MTD MTD support is enabled.
53 NET Appropriate network support is enabled.
54 NUMA NUMA support is enabled.
55 NFS Appropriate NFS support is enabled.
56 OSS OSS sound support is enabled.
57 PARIDE The ParIDE subsystem is enabled.
58 PARISC The PA-RISC architecture is enabled.
59 PCI PCI bus support is enabled.
60 PCMCIA The PCMCIA subsystem is enabled.
61 PNP Plug & Play support is enabled.
62 PPC PowerPC architecture is enabled.
63 PPT Parallel port support is enabled.
64 PS2 Appropriate PS/2 support is enabled.
65 RAM RAM disk support is enabled.
66 S390 S390 architecture is enabled.
67 SCSI Appropriate SCSI support is enabled.
68 A lot of drivers has their options described inside of
69 Documentation/scsi/.
70 SELINUX SELinux support is enabled.
71 SERIAL Serial support is enabled.
72 SMP The kernel is an SMP kernel.
73 SPARC Sparc architecture is enabled.
Randy Dunlapa9913042005-10-23 12:57:11 -070074 SWSUSP Software suspend is enabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 TS Appropriate touchscreen support is enabled.
76 USB USB support is enabled.
77 USBHID USB Human Interface Device support is enabled.
78 V4L Video For Linux support is enabled.
79 VGA The VGA console has been enabled.
80 VT Virtual terminal support is enabled.
81 WDT Watchdog support is enabled.
82 XT IBM PC/XT MFM hard disk support is enabled.
83 X86-64 X86-64 architecture is enabled.
84 More X86-64 boot options can be found in
85 Documentation/x86_64/boot-options.txt .
86
87In addition, the following text indicates that the option:
88
89 BUGS= Relates to possible processor bugs on the said processor.
90 KNL Is a kernel start-up parameter.
91 BOOT Is a boot loader parameter.
92
93Parameters denoted with BOOT are actually interpreted by the boot
94loader, and have no meaning to the kernel directly.
95Do not modify the syntax of boot loader parameters without extreme
96need or coordination with <Documentation/i386/boot.txt>.
97
98Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
99a trailing = on the name of any parameter states that that parameter will
100be entered as an environment variable, whereas its absence indicates that
101it will appear as a kernel argument readable via /proc/cmdline by programs
102running once the system is up.
103
104 53c7xx= [HW,SCSI] Amiga SCSI controllers
105 See header of drivers/scsi/53c7xx.c.
106 See also Documentation/scsi/ncr53c7xx.txt.
107
Randy Dunlapa9913042005-10-23 12:57:11 -0700108 acpi= [HW,ACPI] Advanced Configuration and Power Interface
109 Format: { force | off | ht | strict | noirq }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 force -- enable ACPI if default was off
111 off -- disable ACPI if default was on
112 noirq -- do not use ACPI for IRQ routing
113 ht -- run only enough ACPI to enable Hyper Threading
Randy Dunlapa9913042005-10-23 12:57:11 -0700114 strict -- Be less tolerant of platforms that are not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 strictly ACPI specification compliant.
116
117 See also Documentation/pm.txt, pci=noacpi
118
119 acpi_sleep= [HW,ACPI] Sleep options
120 Format: { s3_bios, s3_mode }
121 See Documentation/power/video.txt
Randy Dunlapa9913042005-10-23 12:57:11 -0700122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
Randy Dunlapa9913042005-10-23 12:57:11 -0700124 Format: { level | edge | high | low }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Randy Dunlapa9913042005-10-23 12:57:11 -0700126 acpi_irq_balance [HW,ACPI]
127 ACPI will balance active IRQs
128 default in APIC mode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Randy Dunlapa9913042005-10-23 12:57:11 -0700130 acpi_irq_nobalance [HW,ACPI]
131 ACPI will not move active IRQs (default)
132 default in PIC mode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Randy Dunlapa9913042005-10-23 12:57:11 -0700134 acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for
135 use by PCI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 Format: <irq>,<irq>...
137
Randy Dunlapa9913042005-10-23 12:57:11 -0700138 acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 Format: <irq>,<irq>...
140
141 acpi_osi= [HW,ACPI] empty param disables _OSI
142
143 acpi_serialize [HW,ACPI] force serialization of AML methods
144
145 acpi_skip_timer_override [HW,ACPI]
146 Recognize and ignore IRQ0/pin2 Interrupt Override.
147 For broken nForce2 BIOS resulting in XT-PIC timer.
148
149 acpi_dbg_layer= [HW,ACPI]
150 Format: <int>
Randy Dunlapa9913042005-10-23 12:57:11 -0700151 Each bit of the <int> indicates an ACPI debug layer,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 1: enable, 0: disable. It is useful for boot time
153 debugging. After system has booted up, it can be set
154 via /proc/acpi/debug_layer.
155
156 acpi_dbg_level= [HW,ACPI]
157 Format: <int>
Randy Dunlapa9913042005-10-23 12:57:11 -0700158 Each bit of the <int> indicates an ACPI debug level,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 1: enable, 0: disable. It is useful for boot time
160 debugging. After system has booted up, it can be set
161 via /proc/acpi/debug_level.
162
163 acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT
164
Luming Yu30e332f2005-08-12 00:31:00 -0400165 acpi_generic_hotkey [HW,ACPI]
166 Allow consolidated generic hotkey driver to
Randy Dunlapa9913042005-10-23 12:57:11 -0700167 override platform specific driver.
Luming Yu30e332f2005-08-12 00:31:00 -0400168 See also Documentation/acpi-hotkey.txt.
169
Chuck Ebbert66759a02005-09-12 18:49:25 +0200170 enable_timer_pin_1 [i386,x86-64]
171 Enable PIN 1 of APIC timer
Randy Dunlapa9913042005-10-23 12:57:11 -0700172 Can be useful to work around chipset bugs
173 (in particular on some ATI chipsets).
Chuck Ebbert66759a02005-09-12 18:49:25 +0200174 The kernel tries to set a reasonable default.
175
176 disable_timer_pin_1 [i386,x86-64]
177 Disable PIN 1 of APIC timer
178 Can be useful to work around chipset bugs.
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 ad1816= [HW,OSS]
181 Format: <io>,<irq>,<dma>,<dma2>
182 See also Documentation/sound/oss/AD1816.
183
184 ad1848= [HW,OSS]
185 Format: <io>,<irq>,<dma>,<dma2>,<type>
186
187 adlib= [HW,OSS]
188 Format: <io>
Randy Dunlapa9913042005-10-23 12:57:11 -0700189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 advansys= [HW,SCSI]
191 See header of drivers/scsi/advansys.c.
192
193 advwdt= [HW,WDT] Advantech WDT
194 Format: <iostart>,<iostop>
195
196 aedsp16= [HW,OSS] Audio Excel DSP 16
197 Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq>
198 See also header of sound/oss/aedsp16.c.
Randy Dunlapa9913042005-10-23 12:57:11 -0700199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 aha152x= [HW,SCSI]
201 See Documentation/scsi/aha152x.txt.
202
203 aha1542= [HW,SCSI]
204 Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]]
205
206 aic7xxx= [HW,SCSI]
207 See Documentation/scsi/aic7xxx.txt.
208
209 aic79xx= [HW,SCSI]
210 See Documentation/scsi/aic79xx.txt.
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 amijoy.map= [HW,JOY] Amiga joystick support
213 Map of devices attached to JOY0DAT and JOY1DAT
214 Format: <a>,<b>
215 See also Documentation/kernel/input/joystick.txt
216
217 analog.map= [HW,JOY] Analog joystick and gamepad support
218 Specifies type or capabilities of an analog joystick
219 connected to one of 16 gameports
220 Format: <type1>,<type2>,..<type16>
221
Randy Dunlapa9913042005-10-23 12:57:11 -0700222 apc= [HW,SPARC]
223 Power management functions (SPARCstation-4/5 + deriv.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 Format: noidle
225 Disable APC CPU standby support. SPARCstation-Fox does
226 not play well with APC CPU idle - disable it if you have
227 APC and your system crashes randomly.
228
Randy Dunlapa9913042005-10-23 12:57:11 -0700229 apic= [APIC,i386] Change the output verbosity whilst booting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 Format: { quiet (default) | verbose | debug }
231 Change the amount of debugging information output
232 when initialising the APIC and IO-APIC components.
Randy Dunlapa9913042005-10-23 12:57:11 -0700233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 apm= [APM] Advanced Power Management
235 See header of arch/i386/kernel/apm.c.
236
237 applicom= [HW]
238 Format: <mem>,<irq>
Randy Dunlapa9913042005-10-23 12:57:11 -0700239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
241 Format: <io>,<irq>,<nodeID>
242
243 ataflop= [HW,M68k]
244
245 atarimouse= [HW,MOUSE] Atari Mouse
246
247 atascsi= [HW,SCSI] Atari SCSI
248
249 atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess,
250 EzKey and similar keyboards
251
252 atkbd.reset= [HW] Reset keyboard during initialization
253
Randy Dunlapa9913042005-10-23 12:57:11 -0700254 atkbd.set= [HW] Select keyboard code set
255 Format: <int> (2 = AT (default), 3 = PS/2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar
258 keyboards
259
260 atkbd.softraw= [HW] Choose between synthetic and real raw mode
261 Format: <bool> (0 = real, 1 = synthetic (default))
Randy Dunlapa9913042005-10-23 12:57:11 -0700262
263 atkbd.softrepeat= [HW]
264 Use software keyboard repeat
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 autotest [IA64]
267
268 awe= [HW,OSS] AWE32/SB32/AWE64 wave table synth
269 Format: <io>,<memsize>,<isapnp>
Randy Dunlapa9913042005-10-23 12:57:11 -0700270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 aztcd= [HW,CD] Aztech CD268 CDROM driver
272 Format: <io>,0x79 (?)
273
274 baycom_epp= [HW,AX25]
275 Format: <io>,<mode>
Randy Dunlapa9913042005-10-23 12:57:11 -0700276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem
278 Format: <io>,<mode>
279 See header of drivers/net/hamradio/baycom_par.c.
280
Randy Dunlapa9913042005-10-23 12:57:11 -0700281 baycom_ser_fdx= [HW,AX25]
282 BayCom Serial Port AX.25 Modem (Full Duplex Mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 Format: <io>,<irq>,<mode>[,<baud>]
284 See header of drivers/net/hamradio/baycom_ser_fdx.c.
285
Randy Dunlapa9913042005-10-23 12:57:11 -0700286 baycom_ser_hdx= [HW,AX25]
287 BayCom Serial Port AX.25 Modem (Half Duplex Mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 Format: <io>,<irq>,<mode>
289 See header of drivers/net/hamradio/baycom_ser_hdx.c.
290
291 blkmtd_device= [HW,MTD]
292 blkmtd_erasesz=
293 blkmtd_ro=
294 blkmtd_bs=
295 blkmtd_count=
296
297 bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
Randy Dunlapa9913042005-10-23 12:57:11 -0700298 bttv.radio= Most important insmod options are available as
299 kernel args too.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 bttv.pll= See Documentation/video4linux/bttv/Insmod-options
301 bttv.tuner= and Documentation/video4linux/bttv/CARDLIST
302
303 BusLogic= [HW,SCSI]
304 See drivers/scsi/BusLogic.c, comment before function
305 BusLogic_ParseDriverOptions().
306
307 c101= [NET] Moxa C101 synchronous serial card
308
309 cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection.
310 Sometimes CPU hardware bugs make them report the cache
311 size incorrectly. The kernel will attempt work arounds
312 to fix known problems, but for some CPUs it is not
313 possible to determine what the correct size should be.
314 This option provides an override for these situations.
315
316 cdu31a= [HW,CD]
317 Format: <io>,<irq>[,PAS]
318 See header of drivers/cdrom/cdu31a.c.
319
320 chandev= [HW,NET] Generic channel device initialisation
321
322 checkreqprot [SELINUX] Set initial checkreqprot flag value.
323 Format: { "0" | "1" }
324 See security/selinux/Kconfig help text.
Randy Dunlapa9913042005-10-23 12:57:11 -0700325 0 -- check protection applied by kernel (includes
326 any implied execute protection).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 1 -- check protection requested by application.
328 Default value is set via a kernel config option.
Randy Dunlapa9913042005-10-23 12:57:11 -0700329 Value can be changed at runtime via
330 /selinux/checkreqprot.
331
332 clock= [BUGS=IA-32,HW] gettimeofday timesource override.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 Forces specified timesource (if avaliable) to be used
Randy Dunlapa9913042005-10-23 12:57:11 -0700334 when calculating gettimeofday(). If specicified
335 timesource is not avalible, it defaults to PIT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 Format: { pit | tsc | cyclone | pmtmr }
337
338 hpet= [IA-32,HPET] option to disable HPET and use PIT.
339 Format: disable
340
341 cm206= [HW,CD]
342 Format: { auto | [<io>,][<irq>] }
343
344 com20020= [HW,NET] ARCnet - COM20020 chipset
Randy Dunlapa9913042005-10-23 12:57:11 -0700345 Format:
346 <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
349 Format: <io>[,<irq>]
350
Randy Dunlapa9913042005-10-23 12:57:11 -0700351 com90xx= [HW,NET]
352 ARCnet - COM90xx chipset (memory-mapped buffers)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 Format: <io>[,<irq>[,<memstart>]]
354
355 condev= [HW,S390] console device
356 conmode=
Randy Dunlapa9913042005-10-23 12:57:11 -0700357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 console= [KNL] Output console device and options.
359
360 tty<n> Use the virtual console device <n>.
361
362 ttyS<n>[,options]
363 Use the specified serial port. The options are of
364 the form "bbbbpn", where "bbbb" is the baud rate,
365 "p" is parity ("n", "o", or "e"), and "n" is bits.
366 Default is "9600n8".
367
368 See also Documentation/serial-console.txt.
369
370 uart,io,<addr>[,options]
371 uart,mmio,<addr>[,options]
372 Start an early, polled-mode console on the 8250/16550
373 UART at the specified I/O port or MMIO address,
374 switching to the matching ttyS device later. The
375 options are the same as for ttyS, above.
376
377 cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
Randy Dunlapa9913042005-10-23 12:57:11 -0700378 Format:
379 <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381 cpia_pp= [HW,PPT]
382 Format: { parport<nr> | auto | none }
383
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700384 crashkernel=nn[KMG]@ss[KMG]
385 [KNL] Reserve a chunk of physical memory to
386 hold a kernel to switch to with kexec on panic.
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 cs4232= [HW,OSS]
389 Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq>
390
391 cs89x0_dma= [HW,NET]
392 Format: <dma>
393
394 cs89x0_media= [HW,NET]
395 Format: { rj45 | aui | bnc }
Randy Dunlapa9913042005-10-23 12:57:11 -0700396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 cyclades= [HW,SERIAL] Cyclades multi-serial port adapter.
Randy Dunlapa9913042005-10-23 12:57:11 -0700398
399 dasd= [HW,NET]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 See header of drivers/s390/block/dasd_devmap.c.
401
402 db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port
403 (one device per port)
404 Format: <port#>,<type>
405 See also Documentation/input/joystick-parport.txt
406
407 debug [KNL] Enable kernel debugging (events log level).
408
409 decnet= [HW,NET]
410 Format: <area>[,<node>]
411 See also Documentation/networking/decnet.txt.
412
413 devfs= [DEVFS]
414 See Documentation/filesystems/devfs/boot-options.
415
416 dhash_entries= [KNL]
417 Set number of hash buckets for dentry cache.
Randy Dunlapa9913042005-10-23 12:57:11 -0700418
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 digi= [HW,SERIAL]
420 IO parameters + enable/disable command.
421
422 digiepca= [HW,SERIAL]
423 See drivers/char/README.epca and
424 Documentation/digiepca.txt.
425
426 dmascc= [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA
427 support available.
428 Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]]
429
430 dmasound= [HW,OSS] Sound subsystem buffers
431
432 dscc4.setup= [NET]
433
434 dtc3181e= [HW,SCSI]
435
Randy Dunlapa9913042005-10-23 12:57:11 -0700436 earlyprintk= [IA-32,X86-64]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 earlyprintk=vga
438 earlyprintk=serial[,ttySn[,baudrate]]
439
Randy Dunlapa9913042005-10-23 12:57:11 -0700440 Append ",keep" to not disable it when the real console
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 takes over.
442
443 Only vga or serial at a time, not both.
444
445 Currently only ttyS0 and ttyS1 are supported.
446
447 Interaction with the standard serial driver is not
448 very good.
449
450 The VGA output is eventually overwritten by the real
451 console.
452
453 eata= [HW,SCSI]
454
Len Brown53f11d42005-12-05 16:46:36 -0500455 ec_intr= [HW,ACPI] ACPI Embedded Controller interrupt mode
456 Format: <int>
457 0: polling mode
458 non-0: interrupt mode (default)
459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 eda= [HW,PS2]
461
462 edb= [HW,PS2]
463
464 edd= [EDD]
465 Format: {"of[f]" | "sk[ipmbr]"}
466 See comment in arch/i386/boot/edd.S
467
Randy Dunlapa9913042005-10-23 12:57:11 -0700468 eicon= [HW,ISDN]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 Format: <id>,<membase>,<irq>
470
471 eisa_irq_edge= [PARISC,HW]
472 See header of drivers/parisc/eisa.c.
473
474 elanfreq= [IA-32]
475 See comment before function elanfreq_setup() in
476 arch/i386/kernel/cpu/cpufreq/elanfreq.c.
477
478 elevator= [IOSCHED]
Randy Dunlap16ab3ad2006-01-14 13:21:20 -0800479 Format: {"anticipatory" | "cfq" | "deadline" | "noop"}
Randy Dunlapa9913042005-10-23 12:57:11 -0700480 See Documentation/block/as-iosched.txt and
481 Documentation/block/deadline-iosched.txt for details.
482
Vivek Goyalaac04b32006-01-09 20:51:47 -0800483 elfcorehdr= [IA-32, X86_64]
Randy Dunlapa9913042005-10-23 12:57:11 -0700484 Specifies physical address of start of kernel core
Vivek Goyalaac04b32006-01-09 20:51:47 -0800485 image elf header. Generally kexec loader will
486 pass this option to capture kernel.
487 See Documentation/kdump/kdump.txt for details.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 enforcing [SELINUX] Set initial enforcing status.
490 Format: {"0" | "1"}
491 See security/selinux/Kconfig help text.
492 0 -- permissive (log only, no denials).
493 1 -- enforcing (deny and log).
494 Default value is 0.
495 Value can be changed at runtime via /selinux/enforce.
496
497 es1370= [HW,OSS]
498 Format: <lineout>[,<micbias>]
499 See also header of sound/oss/es1370.c.
500
501 es1371= [HW,OSS]
502 Format: <spdif>,[<nomix>,[<amplifier>]]
503 See also header of sound/oss/es1371.c.
Randy Dunlapa9913042005-10-23 12:57:11 -0700504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 ether= [HW,NET] Ethernet cards parameters
506 This option is obsoleted by the "netdev=" option, which
507 has equivalent usage. See its documentation for details.
508
509 eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
510 Format: <io>[,<irq>]
511
512 fd_mcs= [HW,SCSI]
513 See header of drivers/scsi/fd_mcs.c.
514
515 fdomain= [HW,SCSI]
516 See header of drivers/scsi/fdomain.c.
517
518 floppy= [HW]
519 See Documentation/floppy.txt.
520
521 ftape= [HW] Floppy Tape subsystem debugging options.
522 See Documentation/ftape.txt.
523
524 gamecon.map[2|3]=
525 [HW,JOY] Multisystem joystick and NES/SNES/PSX pad
526 support via parallel port (up to 5 devices per port)
527 Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
528 See also Documentation/input/joystick-parport.txt
529
530 gamma= [HW,DRM]
531
532 gdth= [HW,SCSI]
533 See header of drivers/scsi/gdth.c.
534
535 gpt [EFI] Forces disk with valid GPT signature but
536 invalid Protective MBR to be treated as GPT.
537
538 gscd= [HW,CD]
539 Format: <io>
540
541 gt96100eth= [NET] MIPS GT96100 Advanced Communication Controller
542
543 gus= [HW,OSS]
544 Format: <io>,<irq>,<dma>,<dma16>
Randy Dunlapa9913042005-10-23 12:57:11 -0700545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 gvp11= [HW,SCSI]
547
548 hashdist= [KNL,NUMA] Large hashes allocated during boot
549 are distributed across NUMA nodes. Defaults on
550 for IA-64, off otherwise.
Randy Dunlapa9913042005-10-23 12:57:11 -0700551 Format: 0 | 1 (for off | on)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553 hcl= [IA-64] SGI's Hardware Graph compatibility layer
554
555 hd= [EIDE] (E)IDE hard drive subsystem geometry
556 Format: <cyl>,<head>,<sect>
557
558 hd?= [HW] (E)IDE subsystem
559 hd?lun= See Documentation/ide.txt.
560
561 highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact
562 size of <nn>. This works even on boxes that have no
563 highmem otherwise. This also works to reduce highmem
564 size on bigger boxes.
565
566 hisax= [HW,ISDN]
567 See Documentation/isdn/README.HiSax.
568
569 hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages.
570
571 noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing
572
573 i8042.direct [HW] Put keyboard port into non-translated mode
574 i8042.dumbkbd [HW] Pretend that controlled can only read data from
575 keyboard and can not control its state
576 (Don't attempt to blink the leds)
577 i8042.noaux [HW] Don't check for auxiliary (== mouse) port
Dmitry Torokhov945ef0d2005-09-04 01:42:00 -0500578 i8042.nokbd [HW] Don't check/create keyboard port
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 i8042.nomux [HW] Don't check presence of an active multiplexing
580 controller
581 i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX
582 controllers
583 i8042.panicblink=
584 [HW] Frequency with which keyboard LEDs should blink
585 when kernel panics (default is 0.5 sec)
586 i8042.reset [HW] Reset the controller during init and cleanup
587 i8042.unlock [HW] Unlock (ignore) the keylock
588
589 i810= [HW,DRM]
590
Dmitry Torokhove70c9d52005-06-25 14:54:25 -0700591 i8k.ignore_dmi [HW] Continue probing hardware even if DMI data
592 indicates that the driver is running on unsupported
593 hardware.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 i8k.force [HW] Activate i8k driver even if SMM BIOS signature
595 does not match list of supported models.
596 i8k.power_status
597 [HW] Report power status in /proc/i8k
598 (disabled by default)
599 i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN
600 capability is set.
601
602 ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter
603 See Documentation/mca.txt.
604
605 icn= [HW,ISDN]
606 Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
607
608 ide= [HW] (E)IDE subsystem
609 Format: ide=nodma or ide=doubler or ide=reverse
610 See Documentation/ide.txt.
611
612 ide?= [HW] (E)IDE subsystem
613 Format: ide?=noprobe or chipset specific parameters.
614 See Documentation/ide.txt.
Randy Dunlapa9913042005-10-23 12:57:11 -0700615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed
617 See Documentation/ide.txt.
618
619 idle= [HW]
620 Format: idle=poll or idle=halt
Randy Dunlapa9913042005-10-23 12:57:11 -0700621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 ihash_entries= [KNL]
623 Set number of hash buckets for inode cache.
624
625 in2000= [HW,SCSI]
626 See header of drivers/scsi/in2000.c.
627
628 init= [KNL]
629 Format: <full_path>
630 Run specified binary instead of /sbin/init as init
631 process.
632
633 initcall_debug [KNL] Trace initcalls as they are executed. Useful
634 for working out where the kernel is dying during
635 startup.
636
637 initrd= [BOOT] Specify the location of the initial ramdisk
638
639 inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
640 Format: <irq>
641
Jesse Barnes2bd0fa32005-12-13 03:05:03 -0500642 combined_mode= [HW] control which driver uses IDE ports in combined
643 mode: legacy IDE driver, libata, or both
644 (in the libata case, libata.atapi_enabled=1 may be
645 useful as well). Note that using the ide or libata
646 options may affect your device naming (e.g. by
647 changing hdc to sdb).
648 Format: combined (default), ide, or libata
649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 inttest= [IA64]
651
652 io7= [HW] IO7 for Marvel based alpha systems
653 See comment before marvel_specify_io7 in
654 arch/alpha/kernel/core_marvel.c.
655
656 ip= [IP_PNP]
657 See Documentation/nfsroot.txt.
658
659 ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
660 See comment before ip2_setup() in drivers/char/ip2.c.
661
662 ips= [HW,SCSI] Adaptec / IBM ServeRAID controller
663 See header of drivers/scsi/ips.c.
664
Alan Cox200803d2005-06-28 20:45:18 -0700665 irqfixup [HW]
666 When an interrupt is not handled search all handlers
667 for it. Intended to get systems with badly broken
668 firmware running.
669
670 irqpoll [HW]
671 When an interrupt is not handled search all handlers
672 for it. Also check all handlers each timer
673 interrupt. Intended to get systems with badly broken
674 firmware running.
675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 isapnp= [ISAPNP]
Randy Dunlapa9913042005-10-23 12:57:11 -0700677 Format: <RDP>,<reset>,<pci_scan>,<verbosity>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler.
680 Format: <cpu number>,...,<cpu number>
681 This option can be used to specify one or more CPUs
682 to isolate from the general SMP balancing and scheduling
683 algorithms. The only way to move a process onto or off
684 an "isolated" CPU is via the CPU affinity syscalls.
685 <cpu number> begins at 0 and the maximum value is
686 "number of CPUs in system - 1".
687
688 This option is the preferred way to isolate CPUs. The
Randy Dunlapa9913042005-10-23 12:57:11 -0700689 alternative -- manually setting the CPU mask of all
690 tasks in the system -- can cause problems and
691 suboptimal load balancer performance.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 isp16= [HW,CD]
694 Format: <io>,<irq>,<dma>,<setup>
695
Randy Dunlapa9913042005-10-23 12:57:11 -0700696 iucv= [HW,NET]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 js= [HW,JOY] Analog joystick
699 See Documentation/input/joystick.txt.
700
701 keepinitrd [HW,ARM]
702
Randy Dunlapa9913042005-10-23 12:57:11 -0700703 kstack=N [IA-32,X86-64] Print N words from the kernel stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 in oops dumps.
705
706 l2cr= [PPC]
707
Randy Dunlapa9913042005-10-23 12:57:11 -0700708 lapic [IA-32,APIC] Enable the local APIC even if BIOS
709 disabled it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
711 lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip
712 Format: addr:<io>,irq:<irq>
713
Randy Dunlapa9913042005-10-23 12:57:11 -0700714 llsc*= [IA64] See function print_params() in
715 arch/ia64/sn/kernel/llsc4.c.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
717 load_ramdisk= [RAM] List of ramdisks to load from floppy
718 See Documentation/ramdisk.txt.
719
Randy Dunlapa6b25b62006-01-14 13:21:19 -0800720 lockd.nlm_grace_period=P [NFS] Assign grace period.
721 Format: <integer>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Randy Dunlapa6b25b62006-01-14 13:21:19 -0800723 lockd.nlm_tcpport=N [NFS] Assign TCP port.
724 Format: <integer>
725
726 lockd.nlm_timeout=T [NFS] Assign timeout value.
727 Format: <integer>
728
729 lockd.nlm_udpport=M [NFS] Assign UDP port.
730 Format: <integer>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver
733 Format: <irq>
734
735 loglevel= All Kernel Messages with a loglevel smaller than the
736 console loglevel will be printed to the console. It can
737 also be changed with klogd or other programs. The
738 loglevels are defined as follows:
739
740 0 (KERN_EMERG) system is unusable
741 1 (KERN_ALERT) action must be taken immediately
742 2 (KERN_CRIT) critical conditions
743 3 (KERN_ERR) error conditions
744 4 (KERN_WARNING) warning conditions
745 5 (KERN_NOTICE) normal but significant condition
746 6 (KERN_INFO) informational
747 7 (KERN_DEBUG) debug-level messages
748
749 log_buf_len=n Sets the size of the printk ring buffer, in bytes.
Randy Dunlapa9913042005-10-23 12:57:11 -0700750 Format: { n | nk | nM }
751 n must be a power of two. The default size
752 is set in the kernel config file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
754 lp=0 [LP] Specify parallel ports to use, e.g,
755 lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
756 lp=reset first parallel port). 'lp=0' disables the
757 lp=auto printer driver. 'lp=reset' (which can be
758 specified in addition to the ports) causes
759 attached printers to be reset. Using
760 lp=port1,port2,... specifies the parallel ports
761 to associate lp devices with, starting with
762 lp0. A port specification may be 'none' to skip
763 that lp device, or a parport name such as
764 'parport0'. Specifying 'lp=auto' instead of a
765 port specification list means that device IDs
766 from each port should be examined, to see if
767 an IEEE 1284-compliant printer is attached; if
768 so, the driver will manage that printer.
769 See also header of drivers/char/lp.c.
770
771 lpj=n [KNL]
772 Sets loops_per_jiffy to given constant, thus avoiding
773 time-consuming boot-time autodetection (up to 250 ms per
774 CPU). 0 enables autodetection (default). To determine
775 the correct value for your kernel, boot with normal
776 autodetection and see what value is printed. Note that
777 on SMP systems the preset will be applied to all CPUs,
778 which is likely to cause problems if your CPUs need
779 significantly divergent settings. An incorrect value
780 will cause delays in the kernel to be wrong, leading to
781 unpredictable I/O errors and other breakage. Although
782 unlikely, in the extreme case this might damage your
783 hardware.
784
785 ltpc= [NET]
786 Format: <io>,<irq>,<dma>
787
Randy Dunlapa9913042005-10-23 12:57:11 -0700788 mac5380= [HW,SCSI] Format:
789 <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Randy Dunlapa9913042005-10-23 12:57:11 -0700791 mac53c9x= [HW,SCSI] Format:
792 <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Randy Dunlapa9913042005-10-23 12:57:11 -0700794 machvec= [IA64] Force the use of a particular machine-vector
795 (machvec) in a generic kernel.
796 Example: machvec=hpzx1_swiotlb
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
Randy Dunlapa9913042005-10-23 12:57:11 -0700798 mad16= [HW,OSS] Format:
799 <io>,<irq>,<dma>,<dma16>,<mpu_io>,<mpu_irq>,<joystick>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801 maui= [HW,OSS]
802 Format: <io>,<irq>
Randy Dunlapa9913042005-10-23 12:57:11 -0700803
804 max_loop= [LOOP] Maximum number of loopback devices that can
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 be mounted
806 Format: <1-256>
807
808 maxcpus= [SMP] Maximum number of processors that an SMP kernel
809 should make use of
810
Bob Picco2b2c3752005-06-29 18:00:00 -0700811 max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or
812 equal to this physical address is ignored.
813
Randy Dunlapa9913042005-10-23 12:57:11 -0700814 max_luns= [SCSI] Maximum number of LUNs to probe.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 Should be between 1 and 2^32-1.
816
817 max_report_luns=
Randy Dunlapa9913042005-10-23 12:57:11 -0700818 [SCSI] Maximum number of LUNs received.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 Should be between 1 and 16384.
820
821 mca-pentium [BUGS=IA-32]
822
823 mcatest= [IA-64]
824
825 mcd= [HW,CD]
826 Format: <port>,<irq>,<mitsumi_bug_93_wait>
827
828 mcdx= [HW,CD]
829
830 mce [IA-32] Machine Check Exception
831
832 md= [HW] RAID subsystems devices and level
833 See Documentation/md.txt.
Randy Dunlapa9913042005-10-23 12:57:11 -0700834
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 mdacon= [MDA]
836 Format: <first>,<last>
837 Specifies range of consoles to be captured by the MDA.
Randy Dunlapa9913042005-10-23 12:57:11 -0700838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
840 Amount of memory to be used when the kernel is not able
841 to see the whole system memory or for test.
842 [IA-32] Use together with memmap= to avoid physical
843 address space collisions. Without memmap= PCI devices
844 could be placed at addresses belonging to unused RAM.
845
846 mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel
847 memory.
848
akpm@osdl.org69cda7b2006-01-09 20:51:46 -0800849 memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 E820 memory map, as specified by the user.
851 Such memmap=exactmap lines can be constructed based on
852 BIOS output or other requirements. See the memmap=nn@ss
853 option description.
854
855 memmap=nn[KMG]@ss[KMG]
856 [KNL] Force usage of a specific region of memory
857 Region of memory to be used, from ss to ss+nn.
858
859 memmap=nn[KMG]#ss[KMG]
860 [KNL,ACPI] Mark specific memory as ACPI data.
861 Region of memory to be used, from ss to ss+nn.
862
863 memmap=nn[KMG]$ss[KMG]
864 [KNL,ACPI] Mark specific memory as reserved.
865 Region of memory to be used, from ss to ss+nn.
866
867 meye.*= [HW] Set MotionEye Camera parameters
868 See Documentation/video4linux/meye.txt.
869
870 mga= [HW,DRM]
871
akpm@osdl.org198e2f12006-01-12 01:05:30 -0800872 migration_cost=
873 [KNL,SMP] debug: override scheduler migration costs
874 Format: <level-1-usecs>,<level-2-usecs>,...
875 This debugging option can be used to override the
876 default scheduler migration cost matrix. The numbers
877 are indexed by 'CPU domain distance'.
878 E.g. migration_cost=1000,2000,3000 on an SMT NUMA
879 box will set up an intra-core migration cost of
880 1 msec, an inter-core migration cost of 2 msecs,
881 and an inter-node migration cost of 3 msecs.
882
883 WARNING: using the wrong values here can break
884 scheduler performance, so it's only for scheduler
885 development purposes, not production environments.
886
887 migration_debug=
888 [KNL,SMP] migration cost auto-detect verbosity
889 Format=<0|1|2>
890 If a system's migration matrix reported at bootup
891 seems erroneous then this option can be used to
892 increase verbosity of the detection process.
893 We default to 0 (no extra messages), 1 will print
894 some more information, and 2 will be really
895 verbose (probably only useful if you also have a
896 serial console attached to the system).
897
898 migration_factor=
899 [KNL,SMP] multiply/divide migration costs by a factor
900 Format=<percent>
901 This debug option can be used to proportionally
902 increase or decrease the auto-detected migration
903 costs for all entries of the migration matrix.
904 E.g. migration_factor=150 will increase migration
905 costs by 50%. (and thus the scheduler will be less
906 eager migrating cache-hot tasks)
907 migration_factor=80 will decrease migration costs
908 by 20%. (thus the scheduler will be more eager to
909 migrate tasks)
910
911 WARNING: using the wrong values here can break
912 scheduler performance, so it's only for scheduler
913 development purposes, not production environments.
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 mousedev.tap_time=
916 [MOUSE] Maximum time between finger touching and
917 leaving touchpad surface for touch to be considered
918 a tap and be reported as a left button click (for
919 touchpads working in absolute mode only).
920 Format: <msecs>
921 mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices
922 reporting absolute coordinates, such as tablets
923 mousedev.yres= [MOUSE] Vertical screen resolution, used for devices
924 reporting absolute coordinates, such as tablets
925
926 mpu401= [HW,OSS]
927 Format: <io>,<irq>
928
929 MTD_Partition= [MTD]
930 Format: <name>,<region-number>,<size>,<offset>
931
Randy Dunlapa9913042005-10-23 12:57:11 -0700932 MTD_Region= [MTD] Format:
933 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 mtdparts= [MTD]
936 See drivers/mtd/cmdline.c.
937
938 mtouchusb.raw_coordinates=
Randy Dunlapa9913042005-10-23 12:57:11 -0700939 [HW] Make the MicroTouch USB driver use raw coordinates
940 ('y', default) or cooked coordinates ('n')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 n2= [NET] SDL Inc. RISCom/N2 synchronous serial card
943
944 NCR_D700= [HW,SCSI]
945 See header of drivers/scsi/NCR_D700.c.
946
947 ncr5380= [HW,SCSI]
948
949 ncr53c400= [HW,SCSI]
950
951 ncr53c400a= [HW,SCSI]
952
953 ncr53c406a= [HW,SCSI]
954
955 ncr53c8xx= [HW,SCSI]
956
957 netdev= [NET] Network devices parameters
958 Format: <irq>,<io>,<mem_start>,<mem_end>,<name>
959 Note that mem_start is often overloaded to mean
960 something different and driver-specific.
Randy Dunlapa9913042005-10-23 12:57:11 -0700961 This usage is only documented in each driver source
962 file if at all.
963
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 nfsaddrs= [NFS]
965 See Documentation/nfsroot.txt.
966
967 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
968 See Documentation/nfsroot.txt.
969
Trond Myklebusta72b4422006-01-03 09:55:41 +0100970 nfs.callback_tcpport=
971 [NFS] set the TCP port on which the NFSv4 callback
972 channel should listen.
973
Trond Myklebust58df0952006-01-03 09:55:57 +0100974 nfs.idmap_cache_timeout=
975 [NFS] set the maximum lifetime for idmapper cache
976 entries.
977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels
979
980 no387 [BUGS=IA-32] Tells the kernel to use the 387 maths
981 emulation library even if a 387 maths coprocessor
982 is present.
983
Randy Dunlapa9913042005-10-23 12:57:11 -0700984 noalign [KNL,ARM]
985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 noapic [SMP,APIC] Tells the kernel to not make use of any
987 IOAPICs that may be present in the system.
988
989 noasync [HW,M68K] Disables async and sync negotiation for
990 all devices.
991
992 nobats [PPC] Do not use BATs for mapping kernel lowmem
993 on "Classic" PPC cores.
994
995 nocache [ARM]
Randy Dunlapa9913042005-10-23 12:57:11 -0700996
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects.
998
999 noexec [IA-64]
1000
Randy Dunlapa9913042005-10-23 12:57:11 -07001001 noexec [IA-32,X86-64]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 noexec=on: enable non-executable mappings (default)
1003 noexec=off: disable nn-executable mappings
1004
1005 nofxsr [BUGS=IA-32]
1006
1007 nohlt [BUGS=ARM]
Randy Dunlapa9913042005-10-23 12:57:11 -07001008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 no-hlt [BUGS=IA-32] Tells the kernel that the hlt
1010 instruction doesn't work correctly and not to
1011 use it.
1012
1013 nohalt [IA-64] Tells the kernel not to use the power saving
1014 function PAL_HALT_LIGHT when idle. This increases
1015 power-consumption. On the positive side, it reduces
1016 interrupt wake-up latency, which may improve performance
1017 in certain environments such as networked servers or
1018 real-time systems.
1019
1020 noirqdebug [IA-32] Disables the code which attempts to detect and
1021 disable unhandled interrupt sources.
1022
1023 noisapnp [ISAPNP] Disables ISA PnP code.
1024
1025 noinitrd [RAM] Tells the kernel not to load any configured
1026 initial RAM disk.
1027
1028 nointroute [IA-64]
1029
1030 nolapic [IA-32,APIC] Do not enable or use the local APIC.
1031
1032 noltlbs [PPC] Do not use large page/tlb entries for kernel
1033 lowmem mapping on PPC40x.
1034
1035 nomce [IA-32] Machine Check Exception
1036
1037 noresidual [PPC] Don't use residual data on PReP machines.
1038
Randy Dunlapa9913042005-10-23 12:57:11 -07001039 noresume [SWSUSP] Disables resume and restores original swap
1040 space.
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 no-scroll [VGA] Disables scrollback.
1043 This is required for the Braillex ib80-piezo Braille
1044 reader made by F.H. Papenmeier (Germany).
1045
1046 nosbagart [IA-64]
1047
1048 nosmp [SMP] Tells an SMP kernel to act as a UP kernel.
1049
1050 nosync [HW,M68K] Disables sync negotiation for all devices.
1051
1052 notsc [BUGS=IA-32] Disable Time Stamp Counter
1053
1054 nousb [USB] Disable the USB subsystem
1055
1056 nowb [ARM]
Randy Dunlapa9913042005-10-23 12:57:11 -07001057
Dave Jonesa61c2d72006-01-07 23:18:19 +00001058 nr_uarts= [SERIAL] maximum number of UARTs to be registered.
1059
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 opl3= [HW,OSS]
1061 Format: <io>
1062
1063 opl3sa= [HW,OSS]
1064 Format: <io>,<irq>,<dma>,<dma2>,<mpu_io>,<mpu_irq>
1065
Randy Dunlapa9913042005-10-23 12:57:11 -07001066 opl3sa2= [HW,OSS] Format:
1067 <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple]
1068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 oprofile.timer= [HW]
1070 Use timer interrupt instead of performance counters
1071
1072 optcd= [HW,CD]
1073 Format: <io>
1074
1075 osst= [HW,SCSI] SCSI Tape Driver
1076 Format: <buffer_size>,<write_threshold>
1077 See also Documentation/scsi/st.txt.
1078
1079 panic= [KNL] Kernel behaviour on panic
1080 Format: <timeout>
1081
1082 parkbd.port= [HW] Parallel port number the keyboard adapter is
1083 connected to, default is 0.
1084 Format: <parport#>
1085 parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
1086 0 for XT, 1 for AT (default is AT).
Randy Dunlapa9913042005-10-23 12:57:11 -07001087 Format: <mode>
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Randy Dunlapa9913042005-10-23 12:57:11 -07001089 parport= [HW,PPT] Specify parallel ports. 0 disables.
1090 Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] }
1091 Use 'auto' to force the driver to use any
1092 IRQ/DMA settings detected (the default is to
1093 ignore detected IRQ/DMA settings because of
1094 possible conflicts). You can specify the base
1095 address, IRQ, and DMA settings; IRQ and DMA
1096 should be numbers, or 'auto' (for using detected
1097 settings on that particular port), or 'nofifo'
1098 (to avoid using a FIFO even if it is detected).
1099 Parallel ports are assigned in the order they
1100 are specified on the command line, starting
1101 with parport0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
Randy Dunlapa9913042005-10-23 12:57:11 -07001103 parport_init_mode= [HW,PPT]
1104 Configure VIA parallel port to operate in
1105 a specific mode. This is necessary on Pegasos
1106 computer where firmware has no options for setting
1107 up parallel port mode and sets it to spp.
1108 Currently this function knows 686a and 8231 chips.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 Format: [spp|ps2|epp|ecp|ecpepp]
1110
Randy Dunlapa9913042005-10-23 12:57:11 -07001111 pas2= [HW,OSS] Format:
1112 <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16>
1113
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 pas16= [HW,SCSI]
1115 See header of drivers/scsi/pas16.c.
1116
1117 pcbit= [HW,ISDN]
1118
1119 pcd. [PARIDE]
1120 See header of drivers/block/paride/pcd.c.
1121 See also Documentation/paride.txt.
1122
Randy Dunlapa9913042005-10-23 12:57:11 -07001123 pci=option[,option...] [PCI] various PCI subsystem options:
1124 off [IA-32] don't probe for the PCI bus
1125 bios [IA-32] force use of PCI BIOS, don't access
1126 the hardware directly. Use this if your machine
1127 has a non-standard PCI host bridge.
1128 nobios [IA-32] disallow use of PCI BIOS, only direct
1129 hardware access methods are allowed. Use this
1130 if you experience crashes upon bootup and you
1131 suspect they are caused by the BIOS.
1132 conf1 [IA-32] Force use of PCI Configuration
1133 Mechanism 1.
1134 conf2 [IA-32] Force use of PCI Configuration
1135 Mechanism 2.
Bjorn Helgaas61be6d62006-02-15 15:17:43 -08001136 nommconf [IA-32,X86_64] Disable use of MMCONFIG for PCI
1137 Configuration
Randy Dunlapa9913042005-10-23 12:57:11 -07001138 nosort [IA-32] Don't sort PCI devices according to
1139 order given by the PCI BIOS. This sorting is
1140 done to get a device order compatible with
1141 older kernels.
1142 biosirq [IA-32] Use PCI BIOS calls to get the interrupt
1143 routing table. These calls are known to be buggy
1144 on several machines and they hang the machine
1145 when used, but on other computers it's the only
1146 way to get the interrupt routing table. Try
1147 this option if the kernel is unable to allocate
1148 IRQs or discover secondary PCI buses on your
1149 motherboard.
1150 rom [IA-32] Assign address space to expansion ROMs.
1151 Use with caution as certain devices share
1152 address decoders between ROMs and other
1153 resources.
1154 irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be
1155 assigned automatically to PCI devices. You can
1156 make the kernel exclude IRQs of your ISA cards
1157 this way.
jayalk@intworks.biz120bb422005-03-21 20:20:42 -08001158 pirqaddr=0xAAAAA [IA-32] Specify the physical address
Randy Dunlapa9913042005-10-23 12:57:11 -07001159 of the PIRQ table (normally generated
1160 by the BIOS) if it is outside the
1161 F0000h-100000h range.
1162 lastbus=N [IA-32] Scan all buses thru bus #N. Can be
1163 useful if the kernel is unable to find your
1164 secondary buses and you want to tell it
1165 explicitly which ones they are.
1166 assign-busses [IA-32] Always assign all PCI bus
1167 numbers ourselves, overriding
1168 whatever the firmware may have done.
1169 usepirqmask [IA-32] Honor the possible IRQ mask stored
1170 in the BIOS $PIR table. This is needed on
1171 some systems with broken BIOSes, notably
1172 some HP Pavilion N5400 and Omnibook XE3
1173 notebooks. This will have no effect if ACPI
1174 IRQ routing is enabled.
1175 noacpi [IA-32] Do not use ACPI for IRQ routing
1176 or for PCI scanning.
1177 routeirq Do IRQ routing for all PCI devices.
1178 This is normally done in pci_enable_device(),
1179 so this option is a temporary workaround
1180 for broken drivers that don't call it.
1181 firmware [ARM] Do not re-enumerate the bus but instead
1182 just use the configuration from the
1183 bootloader. This is currently used on
1184 IXP2000 systems where the bus has to be
1185 configured a certain way for adjunct CPUs.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 pcmv= [HW,PCMCIA] BadgePAD 4
1188
1189 pd. [PARIDE]
1190 See Documentation/paride.txt.
1191
1192 pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at
1193 boot time.
1194 Format: { 0 | 1 }
1195 See arch/parisc/kernel/pdc_chassis.c
1196
1197 pf. [PARIDE]
1198 See Documentation/paride.txt.
1199
1200 pg. [PARIDE]
1201 See Documentation/paride.txt.
1202
1203 pirq= [SMP,APIC] Manual mp-table setup
1204 See Documentation/i386/IO-APIC.txt.
1205
1206 plip= [PPT,NET] Parallel port network link
1207 Format: { parport<nr> | timid | 0 }
1208 See also Documentation/parport.txt.
1209
1210 pnpacpi= [ACPI]
1211 { off }
1212
1213 pnpbios= [ISAPNP]
1214 { on | off | curr | res | no-curr | no-res }
1215
1216 pnp_reserve_irq=
1217 [ISAPNP] Exclude IRQs for the autoconfiguration
1218
1219 pnp_reserve_dma=
1220 [ISAPNP] Exclude DMAs for the autoconfiguration
1221
1222 pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration
Randy Dunlapa9913042005-10-23 12:57:11 -07001223 Ranges are in pairs (I/O port base and size).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
1225 pnp_reserve_mem=
Randy Dunlapa9913042005-10-23 12:57:11 -07001226 [ISAPNP] Exclude memory regions for the
1227 autoconfiguration.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 Ranges are in pairs (memory base and size).
1229
1230 profile= [KNL] Enable kernel profiling via /proc/profile
Randy Dunlapa9913042005-10-23 12:57:11 -07001231 Format: [schedule,]<number>
1232 Param: "schedule" - profile schedule points.
1233 Param: <number> - step/bucket size as a power of 2 for
1234 statistical time based profiling.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
Randy Dunlapa9913042005-10-23 12:57:11 -07001236 processor.max_cstate= [HW,ACPI]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 Limit processor to maximum C-state
1238 max_cstate=9 overrides any DMI blacklist limit.
1239
Len Brown41c0d862005-12-28 12:43:51 -05001240 processor.nocst [HW,ACPI]
1241 Ignore the _CST method to determine C-states,
1242 instead using the legacy FADT method
1243
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
1245 before loading.
1246 See Documentation/ramdisk.txt.
1247
Randy Dunlapa9913042005-10-23 12:57:11 -07001248 psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to
1249 probe for; one of (bare|imps|exps|lifebook|any).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports
1251 per second.
Randy Dunlapa9913042005-10-23 12:57:11 -07001252 psmouse.resetafter= [HW,MOUSE]
1253 Try to reset the device after so many bad packets
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 (0 = never).
1255 psmouse.resolution=
1256 [HW,MOUSE] Set desired mouse resolution, in dpi.
1257 psmouse.smartscroll=
Randy Dunlapa9913042005-10-23 12:57:11 -07001258 [HW,MOUSE] Controls Logitech smartscroll autorepeat.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 0 = disabled, 1 = enabled (default).
1260
1261 pss= [HW,OSS] Personal Sound System (ECHO ESC614)
Randy Dunlapa9913042005-10-23 12:57:11 -07001262 Format:
1263 <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq>
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
1265 pt. [PARIDE]
1266 See Documentation/paride.txt.
1267
1268 quiet= [KNL] Disable log messages
Randy Dunlapa9913042005-10-23 12:57:11 -07001269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 r128= [HW,DRM]
1271
1272 raid= [HW,RAID]
1273 See Documentation/md.txt.
1274
1275 ramdisk= [RAM] Sizes of RAM disks in kilobytes [deprecated]
1276 See Documentation/ramdisk.txt.
1277
Randy Dunlapa9913042005-10-23 12:57:11 -07001278 ramdisk_blocksize= [RAM]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 See Documentation/ramdisk.txt.
Randy Dunlapa9913042005-10-23 12:57:11 -07001280
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
1282 New name for the ramdisk parameter.
1283 See Documentation/ramdisk.txt.
1284
Olof Johanssonffdfc402005-09-06 15:17:19 -07001285 rdinit= [KNL]
1286 Format: <full_path>
1287 Run specified binary instead of /init from the ramdisk,
1288 used for early userspace startup. See initrd.
1289
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
1291 Format: <reboot_mode>[,<reboot_mode2>[,...]]
1292 See arch/*/kernel/reboot.c.
1293
1294 reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
1295
Randy Dunlapa9913042005-10-23 12:57:11 -07001296 resume= [SWSUSP]
1297 Specify the partition device for software suspend
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
1299 rhash_entries= [KNL,NET]
1300 Set number of hash buckets for route cache
1301
1302 riscom8= [HW,SERIAL]
1303 Format: <io_board1>[,<io_board2>[,...<io_boardN>]]
1304
1305 ro [KNL] Mount root device read-only on boot
1306
1307 root= [KNL] Root filesystem
1308
1309 rootdelay= [KNL] Delay (in seconds) to pause before attempting to
1310 mount the root filesystem
1311
1312 rootflags= [KNL] Set root filesystem mount option string
1313
1314 rootfstype= [KNL] Set root filesystem type
1315
1316 rw [KNL] Mount root device read-write on boot
1317
1318 S [KNL] Run init in single mode
1319
1320 sa1100ir [NET]
1321 See drivers/net/irda/sa1100_ir.c.
1322
1323 sb= [HW,OSS]
1324 Format: <io>,<irq>,<dma>,<dma2>
1325
1326 sbni= [NET] Granch SBNI12 leased line adapter
Randy Dunlapa9913042005-10-23 12:57:11 -07001327
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 sbpcd= [HW,CD] Soundblaster CD adapter
1329 Format: <io>,<type>
1330 See a comment before function sbpcd_setup() in
1331 drivers/cdrom/sbpcd.c.
1332
1333 sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver
1334 Format: <io>[,<timeout>[,<isapnp>]]
1335
1336 scsi_debug_*= [SCSI]
1337 See drivers/scsi/scsi_debug.c.
1338
1339 scsi_default_dev_flags=
1340 [SCSI] SCSI default device flags
1341 Format: <integer>
1342
1343 scsi_dev_flags= [SCSI] Black/white list entry for vendor and model
1344 Format: <vendor>:<model>:<flags>
1345 (flags are integer value)
1346
1347 scsi_logging= [SCSI]
1348
1349 selinux [SELINUX] Disable or enable SELinux at boot time.
1350 Format: { "0" | "1" }
1351 See security/selinux/Kconfig help text.
1352 0 -- disable.
1353 1 -- enable.
1354 Default value is set via kernel config option.
1355 If enabled at boot time, /selinux/disable can be used
1356 later to disable prior to initial policy load.
1357
1358 serialnumber [BUGS=IA-32]
1359
Randy Dunlapa9913042005-10-23 12:57:11 -07001360 sg_def_reserved_size= [SCSI]
1361
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 sgalaxy= [HW,OSS]
1363 Format: <io>,<irq>,<dma>,<dma2>,<sgbase>
1364
1365 shapers= [NET]
1366 Maximal number of shapers.
Randy Dunlapa9913042005-10-23 12:57:11 -07001367
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 sim710= [SCSI,HW]
1369 See header of drivers/scsi/sim710.c.
1370
1371 simeth= [IA-64]
1372 simscsi=
Randy Dunlapa9913042005-10-23 12:57:11 -07001373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 sjcd= [HW,CD]
1375 Format: <io>,<irq>,<dma>
1376 See header of drivers/cdrom/sjcd.c.
1377
1378 slram= [HW,MTD]
1379
1380 smart2= [HW]
1381 Format: <io1>[,<io2>[,...,<io8>]]
1382
1383 snd-ad1816a= [HW,ALSA]
1384
1385 snd-ad1848= [HW,ALSA]
1386
1387 snd-ali5451= [HW,ALSA]
1388
1389 snd-als100= [HW,ALSA]
1390
1391 snd-als4000= [HW,ALSA]
1392
1393 snd-azt2320= [HW,ALSA]
1394
1395 snd-cmi8330= [HW,ALSA]
1396
1397 snd-cmipci= [HW,ALSA]
1398
1399 snd-cs4231= [HW,ALSA]
1400
1401 snd-cs4232= [HW,ALSA]
1402
1403 snd-cs4236= [HW,ALSA]
1404
1405 snd-cs4281= [HW,ALSA]
1406
1407 snd-cs46xx= [HW,ALSA]
1408
1409 snd-dt019x= [HW,ALSA]
1410
1411 snd-dummy= [HW,ALSA]
1412
1413 snd-emu10k1= [HW,ALSA]
1414
1415 snd-ens1370= [HW,ALSA]
1416
1417 snd-ens1371= [HW,ALSA]
1418
1419 snd-es968= [HW,ALSA]
1420
1421 snd-es1688= [HW,ALSA]
1422
1423 snd-es18xx= [HW,ALSA]
1424
1425 snd-es1938= [HW,ALSA]
1426
1427 snd-es1968= [HW,ALSA]
1428
1429 snd-fm801= [HW,ALSA]
1430
1431 snd-gusclassic= [HW,ALSA]
1432
1433 snd-gusextreme= [HW,ALSA]
1434
1435 snd-gusmax= [HW,ALSA]
1436
1437 snd-hdsp= [HW,ALSA]
1438
1439 snd-ice1712= [HW,ALSA]
1440
1441 snd-intel8x0= [HW,ALSA]
1442
1443 snd-interwave= [HW,ALSA]
1444
1445 snd-interwave-stb=
1446 [HW,ALSA]
1447
1448 snd-korg1212= [HW,ALSA]
1449
1450 snd-maestro3= [HW,ALSA]
1451
1452 snd-mpu401= [HW,ALSA]
1453
1454 snd-mtpav= [HW,ALSA]
1455
1456 snd-nm256= [HW,ALSA]
1457
1458 snd-opl3sa2= [HW,ALSA]
1459
1460 snd-opti92x-ad1848=
1461 [HW,ALSA]
1462
1463 snd-opti92x-cs4231=
1464 [HW,ALSA]
1465
1466 snd-opti93x= [HW,ALSA]
1467
1468 snd-pmac= [HW,ALSA]
1469
1470 snd-rme32= [HW,ALSA]
1471
1472 snd-rme96= [HW,ALSA]
1473
1474 snd-rme9652= [HW,ALSA]
1475
1476 snd-sb8= [HW,ALSA]
1477
1478 snd-sb16= [HW,ALSA]
1479
1480 snd-sbawe= [HW,ALSA]
1481
1482 snd-serial= [HW,ALSA]
1483
1484 snd-sgalaxy= [HW,ALSA]
1485
1486 snd-sonicvibes= [HW,ALSA]
1487
1488 snd-sun-amd7930=
1489 [HW,ALSA]
1490
1491 snd-sun-cs4231= [HW,ALSA]
1492
1493 snd-trident= [HW,ALSA]
1494
1495 snd-usb-audio= [HW,ALSA,USB]
1496
1497 snd-via82xx= [HW,ALSA]
1498
1499 snd-virmidi= [HW,ALSA]
1500
1501 snd-wavefront= [HW,ALSA]
1502
1503 snd-ymfpci= [HW,ALSA]
Randy Dunlapa9913042005-10-23 12:57:11 -07001504
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 sonicvibes= [HW,OSS]
1506 Format: <reverb>
Randy Dunlapa9913042005-10-23 12:57:11 -07001507
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 sonycd535= [HW,CD]
1509 Format: <io>[,<irq>]
1510
1511 sonypi.*= [HW] Sony Programmable I/O Control Device driver
1512 See Documentation/sonypi.txt
1513
1514 specialix= [HW,SERIAL] Specialix multi-serial port adapter
1515 See Documentation/specialix.txt.
1516
1517 spia_io_base= [HW,MTD]
1518 spia_fio_base=
1519 spia_pedr=
1520 spia_peddr=
1521
1522 sscape= [HW,OSS]
1523 Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq>
Randy Dunlapa9913042005-10-23 12:57:11 -07001524
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 st= [HW,SCSI] SCSI tape parameters (buffers, etc.)
1526 See Documentation/scsi/st.txt.
1527
1528 st0x= [HW,SCSI]
1529 See header of drivers/scsi/seagate.c.
1530
1531 sti= [PARISC,HW]
1532 Format: <num>
1533 Set the STI (builtin display/keyboard on the HP-PARISC
1534 machines) console (graphic card) which should be used
1535 as the initial boot-console.
1536 See also comment in drivers/video/console/sticore.c.
1537
1538 sti_font= [HW]
1539 See comment in drivers/video/console/sticore.c.
1540
1541 stifb= [HW]
1542 Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]]
1543
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 swiotlb= [IA-64] Number of I/O TLB slabs
Randy Dunlapa9913042005-10-23 12:57:11 -07001545
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 switches= [HW,M68k]
1547
1548 sym53c416= [HW,SCSI]
1549 See header of drivers/scsi/sym53c416.c.
1550
1551 t128= [HW,SCSI]
1552 See header of drivers/scsi/t128.c.
1553
1554 tdfx= [HW,DRM]
1555
1556 thash_entries= [KNL,NET]
1557 Set number of hash buckets for TCP connection
1558
1559 time Show timing data prefixed to each printk message line
1560
1561 tipar.timeout= [HW,PPT]
1562 Set communications timeout in tenths of a second
1563 (default 15).
1564
1565 tipar.delay= [HW,PPT]
1566 Set inter-bit delay in microseconds (default 10).
1567
1568 tmc8xx= [HW,SCSI]
1569 See header of drivers/scsi/seagate.c.
1570
1571 tmscsim= [HW,SCSI]
1572 See comment before function dc390_setup() in
1573 drivers/scsi/tmscsim.c.
1574
1575 tp720= [HW,PS2]
1576
1577 trix= [HW,OSS] MediaTrix AudioTrix Pro
Randy Dunlapa9913042005-10-23 12:57:11 -07001578 Format:
1579 <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq>
1580
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 tsdev.xres= [TS] Horizontal screen resolution.
1582 tsdev.yres= [TS] Vertical screen resolution.
1583
Randy Dunlapa9913042005-10-23 12:57:11 -07001584 turbografx.map[2|3]= [HW,JOY]
1585 TurboGraFX parallel port interface
1586 Format:
1587 <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 See also Documentation/input/joystick-parport.txt
1589
1590 u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter
1591 See header of drivers/scsi/u14-34f.c.
1592
1593 uart401= [HW,OSS]
1594 Format: <io>,<irq>
1595
1596 uart6850= [HW,OSS]
1597 Format: <io>,<irq>
1598
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 usbhid.mousepoll=
1600 [USBHID] The interval which mice are to be polled at.
Randy Dunlapa9913042005-10-23 12:57:11 -07001601
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 video= [FB] Frame buffer configuration
1603 See Documentation/fb/modedb.txt.
1604
1605 vga= [BOOT,IA-32] Select a particular video mode
Randy Dunlapa9913042005-10-23 12:57:11 -07001606 See Documentation/i386/boot.txt and
1607 Documentation/svga.txt.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 Use vga=ask for menu.
1609 This is actually a boot loader parameter; the value is
1610 passed to the kernel using a special protocol.
1611
Randy Dunlapa9913042005-10-23 12:57:11 -07001612 vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 size of <nn>. This can be used to increase the
1614 minimum size (128MB on x86). It can also be used to
1615 decrease the size and leave more room for directly
1616 mapped kernel RAM.
1617
1618 vmhalt= [KNL,S390]
1619
Randy Dunlapa9913042005-10-23 12:57:11 -07001620 vmpoff= [KNL,S390]
1621
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 waveartist= [HW,OSS]
1623 Format: <io>,<irq>,<dma>,<dma2>
Randy Dunlapa9913042005-10-23 12:57:11 -07001624
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 wd33c93= [HW,SCSI]
1626 See header of drivers/scsi/wd33c93.c.
1627
1628 wd7000= [HW,SCSI]
1629 See header of drivers/scsi/wd7000.c.
1630
1631 wdt= [WDT] Watchdog
1632 See Documentation/watchdog/watchdog.txt.
1633
1634 xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks.
1635 xd_geo= See header of drivers/block/xd.c.
1636
1637 xirc2ps_cs= [NET,PCMCIA]
Randy Dunlapa9913042005-10-23 12:57:11 -07001638 Format:
1639 <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640
Andi Kleena62eaf12006-02-16 23:41:58 +01001641 norandmaps Don't use address space randomization
1642 Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space
1643
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644
Randy Dunlapa9913042005-10-23 12:57:11 -07001645______________________________________________________________________
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646Changelog:
1647
Randy Dunlapa9913042005-10-23 12:57:11 -070016482000-06-?? Mr. Unknown
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 The last known update (for 2.4.0) - the changelog was not kept before.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001650
Randy Dunlapa9913042005-10-23 12:57:11 -070016512002-11-24 Petr Baudis <pasky@ucw.cz>
1652 Randy Dunlap <randy.dunlap@verizon.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 Update for 2.5.49, description for most of the options introduced,
1654 references to other documentation (C files, READMEs, ..), added S390,
1655 PPC, SPARC, MTD, ALSA and OSS category. Minor corrections and
1656 reformatting.
Randy Dunlapa9913042005-10-23 12:57:11 -07001657
16582005-10-19 Randy Dunlap <rdunlap@xenotime.net>
1659 Lots of typos, whitespace, some reformatting.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660
1661TODO:
1662
1663 Add documentation for ALSA options.
1664 Add more DRM drivers.