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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 | Hyphens (dashes) and underscores are equivalent in parameter names, so |
21 | log_buf_len=1M print-fatal-signals=1 |
22 | can also be entered as |
23 | log-buf-len=1M print_fatal_signals=1 |
24 | |
25 | |
26 | This document may not be entirely up to date and comprehensive. The command |
27 | "modinfo -p ${modulename}" shows a current list of all parameters of a loadable |
28 | module. Loadable modules, after being loaded into the running kernel, also |
29 | reveal their parameters in /sys/module/${modulename}/parameters/. Some of these |
30 | parameters may be changed at runtime by the command |
31 | "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". |
32 | |
33 | The parameters listed below are only valid if certain kernel build options were |
34 | enabled and if respective hardware is present. The text in square brackets at |
35 | the beginning of each description states the restrictions within which a |
36 | parameter is applicable: |
37 | |
38 | ACPI ACPI support is enabled. |
39 | AGP AGP (Accelerated Graphics Port) is enabled. |
40 | ALSA ALSA sound support is enabled. |
41 | APIC APIC support is enabled. |
42 | APM Advanced Power Management support is enabled. |
43 | AVR32 AVR32 architecture is enabled. |
44 | AX25 Appropriate AX.25 support is enabled. |
45 | BLACKFIN Blackfin architecture is enabled. |
46 | DRM Direct Rendering Management support is enabled. |
47 | DYNAMIC_DEBUG Build in debug messages and enable them at runtime |
48 | EDD BIOS Enhanced Disk Drive Services (EDD) is enabled |
49 | EFI EFI Partitioning (GPT) is enabled |
50 | EIDE EIDE/ATAPI support is enabled. |
51 | FB The frame buffer device is enabled. |
52 | GCOV GCOV profiling is enabled. |
53 | HW Appropriate hardware is enabled. |
54 | IA-64 IA-64 architecture is enabled. |
55 | IMA Integrity measurement architecture is enabled. |
56 | IOSCHED More than one I/O scheduler is enabled. |
57 | IP_PNP IP DHCP, BOOTP, or RARP is enabled. |
58 | IPV6 IPv6 support is enabled. |
59 | ISAPNP ISA PnP code is enabled. |
60 | ISDN Appropriate ISDN support is enabled. |
61 | JOY Appropriate joystick support is enabled. |
62 | KGDB Kernel debugger support is enabled. |
63 | KVM Kernel Virtual Machine support is enabled. |
64 | LIBATA Libata driver is enabled |
65 | LP Printer support is enabled. |
66 | LOOP Loopback device support is enabled. |
67 | M68k M68k architecture is enabled. |
68 | These options have more detailed description inside of |
69 | Documentation/m68k/kernel-options.txt. |
70 | MCA MCA bus support is enabled. |
71 | MDA MDA console support is enabled. |
72 | MOUSE Appropriate mouse support is enabled. |
73 | MSI Message Signaled Interrupts (PCI). |
74 | MTD MTD (Memory Technology Device) support is enabled. |
75 | NET Appropriate network support is enabled. |
76 | NUMA NUMA support is enabled. |
77 | NFS Appropriate NFS support is enabled. |
78 | OSS OSS sound support is enabled. |
79 | PV_OPS A paravirtualized kernel is enabled. |
80 | PARIDE The ParIDE (parallel port IDE) subsystem is enabled. |
81 | PARISC The PA-RISC architecture is enabled. |
82 | PCI PCI bus support is enabled. |
83 | PCIE PCI Express support is enabled. |
84 | PCMCIA The PCMCIA subsystem is enabled. |
85 | PNP Plug & Play support is enabled. |
86 | PPC PowerPC architecture is enabled. |
87 | PPT Parallel port support is enabled. |
88 | PS2 Appropriate PS/2 support is enabled. |
89 | RAM RAM disk support is enabled. |
90 | S390 S390 architecture is enabled. |
91 | SCSI Appropriate SCSI support is enabled. |
92 | A lot of drivers have their options described inside |
93 | the Documentation/scsi/ sub-directory. |
94 | SECURITY Different security models are enabled. |
95 | SELINUX SELinux support is enabled. |
96 | APPARMOR AppArmor support is enabled. |
97 | SERIAL Serial support is enabled. |
98 | SH SuperH architecture is enabled. |
99 | SMP The kernel is an SMP kernel. |
100 | SPARC Sparc architecture is enabled. |
101 | SWSUSP Software suspend (hibernation) is enabled. |
102 | SUSPEND System suspend states are enabled. |
103 | FTRACE Function tracing enabled. |
104 | TPM TPM drivers are enabled. |
105 | TS Appropriate touchscreen support is enabled. |
106 | UMS USB Mass Storage support is enabled. |
107 | USB USB support is enabled. |
108 | USBHID USB Human Interface Device support is enabled. |
109 | V4L Video For Linux support is enabled. |
110 | VGA The VGA console has been enabled. |
111 | VT Virtual terminal support is enabled. |
112 | WDT Watchdog support is enabled. |
113 | XT IBM PC/XT MFM hard disk support is enabled. |
114 | X86-32 X86-32, aka i386 architecture is enabled. |
115 | X86-64 X86-64 architecture is enabled. |
116 | More X86-64 boot options can be found in |
117 | Documentation/x86/x86_64/boot-options.txt . |
118 | X86 Either 32bit or 64bit x86 (same as X86-32+X86-64) |
119 | XEN Xen support is enabled |
120 | |
121 | In addition, the following text indicates that the option: |
122 | |
123 | BUGS= Relates to possible processor bugs on the said processor. |
124 | KNL Is a kernel start-up parameter. |
125 | BOOT Is a boot loader parameter. |
126 | |
127 | Parameters denoted with BOOT are actually interpreted by the boot |
128 | loader, and have no meaning to the kernel directly. |
129 | Do not modify the syntax of boot loader parameters without extreme |
130 | need or coordination with <Documentation/x86/boot.txt>. |
131 | |
132 | There are also arch-specific kernel-parameters not documented here. |
133 | See for example <Documentation/x86/x86_64/boot-options.txt>. |
134 | |
135 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that |
136 | a trailing = on the name of any parameter states that that parameter will |
137 | be entered as an environment variable, whereas its absence indicates that |
138 | it will appear as a kernel argument readable via /proc/cmdline by programs |
139 | running once the system is up. |
140 | |
141 | The number of kernel parameters is not limited, but the length of the |
142 | complete command line (parameters including spaces etc.) is limited to |
143 | a fixed number of characters. This limit depends on the architecture |
144 | and is between 256 and 4096 characters. It is defined in the file |
145 | ./include/asm/setup.h as COMMAND_LINE_SIZE. |
146 | |
147 | Finally, the [KMG] suffix is commonly described after a number of kernel |
148 | parameter values. These 'K', 'M', and 'G' letters represent the _binary_ |
149 | multipliers 'Kilo', 'Mega', and 'Giga', equalling 2^10, 2^20, and 2^30 |
150 | bytes respectively. Such letter suffixes can also be entirely omitted. |
151 | |
152 | |
153 | acpi= [HW,ACPI,X86] |
154 | Advanced Configuration and Power Interface |
155 | Format: { force | off | strict | noirq | rsdt } |
156 | force -- enable ACPI if default was off |
157 | off -- disable ACPI if default was on |
158 | noirq -- do not use ACPI for IRQ routing |
159 | strict -- Be less tolerant of platforms that are not |
160 | strictly ACPI specification compliant. |
161 | rsdt -- prefer RSDT over (default) XSDT |
162 | copy_dsdt -- copy DSDT to memory |
163 | |
164 | See also Documentation/power/pm.txt, pci=noacpi |
165 | |
166 | acpi_apic_instance= [ACPI, IOAPIC] |
167 | Format: <int> |
168 | 2: use 2nd APIC table, if available |
169 | 1,0: use 1st APIC table |
170 | default: 0 |
171 | |
172 | acpi_backlight= [HW,ACPI] |
173 | acpi_backlight=vendor |
174 | acpi_backlight=video |
175 | If set to vendor, prefer vendor specific driver |
176 | (e.g. thinkpad_acpi, sony_acpi, etc.) instead |
177 | of the ACPI video.ko driver. |
178 | |
179 | acpi.debug_layer= [HW,ACPI,ACPI_DEBUG] |
180 | acpi.debug_level= [HW,ACPI,ACPI_DEBUG] |
181 | Format: <int> |
182 | CONFIG_ACPI_DEBUG must be enabled to produce any ACPI |
183 | debug output. Bits in debug_layer correspond to a |
184 | _COMPONENT in an ACPI source file, e.g., |
185 | #define _COMPONENT ACPI_PCI_COMPONENT |
186 | Bits in debug_level correspond to a level in |
187 | ACPI_DEBUG_PRINT statements, e.g., |
188 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, ... |
189 | The debug_level mask defaults to "info". See |
190 | Documentation/acpi/debug.txt for more information about |
191 | debug layers and levels. |
192 | |
193 | Enable processor driver info messages: |
194 | acpi.debug_layer=0x20000000 |
195 | Enable PCI/PCI interrupt routing info messages: |
196 | acpi.debug_layer=0x400000 |
197 | Enable AML "Debug" output, i.e., stores to the Debug |
198 | object while interpreting AML: |
199 | acpi.debug_layer=0xffffffff acpi.debug_level=0x2 |
200 | Enable all messages related to ACPI hardware: |
201 | acpi.debug_layer=0x2 acpi.debug_level=0xffffffff |
202 | |
203 | Some values produce so much output that the system is |
204 | unusable. The "log_buf_len" parameter may be useful |
205 | if you need to capture more output. |
206 | |
207 | acpi_irq_balance [HW,ACPI] |
208 | ACPI will balance active IRQs |
209 | default in APIC mode |
210 | |
211 | acpi_irq_nobalance [HW,ACPI] |
212 | ACPI will not move active IRQs (default) |
213 | default in PIC mode |
214 | |
215 | acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA |
216 | Format: <irq>,<irq>... |
217 | |
218 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for |
219 | use by PCI |
220 | Format: <irq>,<irq>... |
221 | |
222 | acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT |
223 | |
224 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS |
225 | Format: To spoof as Windows 98: ="Microsoft Windows" |
226 | |
227 | acpi_osi= [HW,ACPI] Modify list of supported OS interface strings |
228 | acpi_osi="string1" # add string1 -- only one string |
229 | acpi_osi="!string2" # remove built-in string2 |
230 | acpi_osi= # disable all strings |
231 | |
232 | acpi_pm_good [X86] |
233 | Override the pmtimer bug detection: force the kernel |
234 | to assume that this machine's pmtimer latches its value |
235 | and always returns good values. |
236 | |
237 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode |
238 | Format: { level | edge | high | low } |
239 | |
240 | acpi_serialize [HW,ACPI] force serialization of AML methods |
241 | |
242 | acpi_skip_timer_override [HW,ACPI] |
243 | Recognize and ignore IRQ0/pin2 Interrupt Override. |
244 | For broken nForce2 BIOS resulting in XT-PIC timer. |
245 | |
246 | acpi_sleep= [HW,ACPI] Sleep options |
247 | Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, |
248 | old_ordering, nonvs, sci_force_enable } |
249 | See Documentation/power/video.txt for information on |
250 | s3_bios and s3_mode. |
251 | s3_beep is for debugging; it makes the PC's speaker beep |
252 | as soon as the kernel's real-mode entry point is called. |
253 | s4_nohwsig prevents ACPI hardware signature from being |
254 | used during resume from hibernation. |
255 | old_ordering causes the ACPI 1.0 ordering of the _PTS |
256 | control method, with respect to putting devices into |
257 | low power states, to be enforced (the ACPI 2.0 ordering |
258 | of _PTS is used by default). |
259 | nonvs prevents the kernel from saving/restoring the |
260 | ACPI NVS memory during suspend/hibernation and resume. |
261 | sci_force_enable causes the kernel to set SCI_EN directly |
262 | on resume from S1/S3 (which is against the ACPI spec, |
263 | but some broken systems don't work without it). |
264 | |
265 | acpi_use_timer_override [HW,ACPI] |
266 | Use timer override. For some broken Nvidia NF5 boards |
267 | that require a timer override, but don't have HPET |
268 | |
269 | acpi_enforce_resources= [ACPI] |
270 | { strict | lax | no } |
271 | Check for resource conflicts between native drivers |
272 | and ACPI OperationRegions (SystemIO and SystemMemory |
273 | only). IO ports and memory declared in ACPI might be |
274 | used by the ACPI subsystem in arbitrary AML code and |
275 | can interfere with legacy drivers. |
276 | strict (default): access to resources claimed by ACPI |
277 | is denied; legacy drivers trying to access reserved |
278 | resources will fail to bind to device using them. |
279 | lax: access to resources claimed by ACPI is allowed; |
280 | legacy drivers trying to access reserved resources |
281 | will bind successfully but a warning message is logged. |
282 | no: ACPI OperationRegions are not marked as reserved, |
283 | no further checks are performed. |
284 | |
285 | add_efi_memmap [EFI; X86] Include EFI memory map in |
286 | kernel's map of available physical RAM. |
287 | |
288 | agp= [AGP] |
289 | { off | try_unsupported } |
290 | off: disable AGP support |
291 | try_unsupported: try to drive unsupported chipsets |
292 | (may crash computer or cause data corruption) |
293 | |
294 | ALSA [HW,ALSA] |
295 | See Documentation/sound/alsa/alsa-parameters.txt |
296 | |
297 | alignment= [KNL,ARM] |
298 | Allow the default userspace alignment fault handler |
299 | behaviour to be specified. Bit 0 enables warnings, |
300 | bit 1 enables fixups, and bit 2 sends a segfault. |
301 | |
302 | amd_iommu= [HW,X86-84] |
303 | Pass parameters to the AMD IOMMU driver in the system. |
304 | Possible values are: |
305 | fullflush - enable flushing of IO/TLB entries when |
306 | they are unmapped. Otherwise they are |
307 | flushed before they will be reused, which |
308 | is a lot of faster |
309 | off - do not initialize any AMD IOMMU found in |
310 | the system |
311 | |
312 | amijoy.map= [HW,JOY] Amiga joystick support |
313 | Map of devices attached to JOY0DAT and JOY1DAT |
314 | Format: <a>,<b> |
315 | See also Documentation/kernel/input/joystick.txt |
316 | |
317 | analog.map= [HW,JOY] Analog joystick and gamepad support |
318 | Specifies type or capabilities of an analog joystick |
319 | connected to one of 16 gameports |
320 | Format: <type1>,<type2>,..<type16> |
321 | |
322 | apc= [HW,SPARC] |
323 | Power management functions (SPARCstation-4/5 + deriv.) |
324 | Format: noidle |
325 | Disable APC CPU standby support. SPARCstation-Fox does |
326 | not play well with APC CPU idle - disable it if you have |
327 | APC and your system crashes randomly. |
328 | |
329 | apic= [APIC,X86-32] Advanced Programmable Interrupt Controller |
330 | Change the output verbosity whilst booting |
331 | Format: { quiet (default) | verbose | debug } |
332 | Change the amount of debugging information output |
333 | when initialising the APIC and IO-APIC components. |
334 | |
335 | autoconf= [IPV6] |
336 | See Documentation/networking/ipv6.txt. |
337 | |
338 | show_lapic= [APIC,X86] Advanced Programmable Interrupt Controller |
339 | Limit apic dumping. The parameter defines the maximal |
340 | number of local apics being dumped. Also it is possible |
341 | to set it to "all" by meaning -- no limit here. |
342 | Format: { 1 (default) | 2 | ... | all }. |
343 | The parameter valid if only apic=debug or |
344 | apic=verbose is specified. |
345 | Example: apic=debug show_lapic=all |
346 | |
347 | apm= [APM] Advanced Power Management |
348 | See header of arch/x86/kernel/apm_32.c. |
349 | |
350 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards |
351 | Format: <io>,<irq>,<nodeID> |
352 | |
353 | ataflop= [HW,M68k] |
354 | |
355 | atarimouse= [HW,MOUSE] Atari Mouse |
356 | |
357 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, |
358 | EzKey and similar keyboards |
359 | |
360 | atkbd.reset= [HW] Reset keyboard during initialization |
361 | |
362 | atkbd.set= [HW] Select keyboard code set |
363 | Format: <int> (2 = AT (default), 3 = PS/2) |
364 | |
365 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar |
366 | keyboards |
367 | |
368 | atkbd.softraw= [HW] Choose between synthetic and real raw mode |
369 | Format: <bool> (0 = real, 1 = synthetic (default)) |
370 | |
371 | atkbd.softrepeat= [HW] |
372 | Use software keyboard repeat |
373 | |
374 | autotest [IA64] |
375 | |
376 | baycom_epp= [HW,AX25] |
377 | Format: <io>,<mode> |
378 | |
379 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem |
380 | Format: <io>,<mode> |
381 | See header of drivers/net/hamradio/baycom_par.c. |
382 | |
383 | baycom_ser_fdx= [HW,AX25] |
384 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
385 | Format: <io>,<irq>,<mode>[,<baud>] |
386 | See header of drivers/net/hamradio/baycom_ser_fdx.c. |
387 | |
388 | baycom_ser_hdx= [HW,AX25] |
389 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
390 | Format: <io>,<irq>,<mode> |
391 | See header of drivers/net/hamradio/baycom_ser_hdx.c. |
392 | |
393 | boot_delay= Milliseconds to delay each printk during boot. |
394 | Values larger than 10 seconds (10000) are changed to |
395 | no delay (0). |
396 | Format: integer |
397 | |
398 | bootmem_debug [KNL] Enable bootmem allocator debug messages. |
399 | |
400 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
401 | bttv.radio= Most important insmod options are available as |
402 | kernel args too. |
403 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options |
404 | bttv.tuner= and Documentation/video4linux/bttv/CARDLIST |
405 | |
406 | bulk_remove=off [PPC] This parameter disables the use of the pSeries |
407 | firmware feature for flushing multiple hpte entries |
408 | at a time. |
409 | |
410 | c101= [NET] Moxa C101 synchronous serial card |
411 | |
412 | cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection. |
413 | Sometimes CPU hardware bugs make them report the cache |
414 | size incorrectly. The kernel will attempt work arounds |
415 | to fix known problems, but for some CPUs it is not |
416 | possible to determine what the correct size should be. |
417 | This option provides an override for these situations. |
418 | |
419 | capability.disable= |
420 | [SECURITY] Disable capabilities. This would normally |
421 | be used only if an alternative security model is to be |
422 | configured. Potentially dangerous and should only be |
423 | used if you are entirely sure of the consequences. |
424 | |
425 | ccw_timeout_log [S390] |
426 | See Documentation/s390/CommonIO for details. |
427 | |
428 | cgroup_disable= [KNL] Disable a particular controller |
429 | Format: {name of the controller(s) to disable} |
430 | {Currently supported controllers - "memory"} |
431 | |
432 | checkreqprot [SELINUX] Set initial checkreqprot flag value. |
433 | Format: { "0" | "1" } |
434 | See security/selinux/Kconfig help text. |
435 | 0 -- check protection applied by kernel (includes |
436 | any implied execute protection). |
437 | 1 -- check protection requested by application. |
438 | Default value is set via a kernel config option. |
439 | Value can be changed at runtime via |
440 | /selinux/checkreqprot. |
441 | |
442 | cio_ignore= [S390] |
443 | See Documentation/s390/CommonIO for details. |
444 | |
445 | clock= [BUGS=X86-32, HW] gettimeofday clocksource override. |
446 | [Deprecated] |
447 | Forces specified clocksource (if available) to be used |
448 | when calculating gettimeofday(). If specified |
449 | clocksource is not available, it defaults to PIT. |
450 | Format: { pit | tsc | cyclone | pmtmr } |
451 | |
452 | clocksource= Override the default clocksource |
453 | Format: <string> |
454 | Override the default clocksource and use the clocksource |
455 | with the name specified. |
456 | Some clocksource names to choose from, depending on |
457 | the platform: |
458 | [all] jiffies (this is the base, fallback clocksource) |
459 | [ACPI] acpi_pm |
460 | [ARM] imx_timer1,OSTS,netx_timer,mpu_timer2, |
461 | pxa_timer,timer3,32k_counter,timer0_1 |
462 | [AVR32] avr32 |
463 | [X86-32] pit,hpet,tsc; |
464 | scx200_hrt on Geode; cyclone on IBM x440 |
465 | [MIPS] MIPS |
466 | [PARISC] cr16 |
467 | [S390] tod |
468 | [SH] SuperH |
469 | [SPARC64] tick |
470 | [X86-64] hpet,tsc |
471 | |
472 | clearcpuid=BITNUM [X86] |
473 | Disable CPUID feature X for the kernel. See |
474 | arch/x86/include/asm/cpufeature.h for the valid bit |
475 | numbers. Note the Linux specific bits are not necessarily |
476 | stable over kernel options, but the vendor specific |
477 | ones should be. |
478 | Also note that user programs calling CPUID directly |
479 | or using the feature without checking anything |
480 | will still see it. This just prevents it from |
481 | being used by the kernel or shown in /proc/cpuinfo. |
482 | Also note the kernel might malfunction if you disable |
483 | some critical bits. |
484 | |
485 | cmo_free_hint= [PPC] Format: { yes | no } |
486 | Specify whether pages are marked as being inactive |
487 | when they are freed. This is used in CMO environments |
488 | to determine OS memory pressure for page stealing by |
489 | a hypervisor. |
490 | Default: yes |
491 | |
492 | code_bytes [X86] How many bytes of object code to print |
493 | in an oops report. |
494 | Range: 0 - 8192 |
495 | Default: 64 |
496 | |
497 | com20020= [HW,NET] ARCnet - COM20020 chipset |
498 | Format: |
499 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
500 | |
501 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) |
502 | Format: <io>[,<irq>] |
503 | |
504 | com90xx= [HW,NET] |
505 | ARCnet - COM90xx chipset (memory-mapped buffers) |
506 | Format: <io>[,<irq>[,<memstart>]] |
507 | |
508 | condev= [HW,S390] console device |
509 | conmode= |
510 | |
511 | console= [KNL] Output console device and options. |
512 | |
513 | tty<n> Use the virtual console device <n>. |
514 | |
515 | ttyS<n>[,options] |
516 | ttyUSB0[,options] |
517 | Use the specified serial port. The options are of |
518 | the form "bbbbpnf", where "bbbb" is the baud rate, |
519 | "p" is parity ("n", "o", or "e"), "n" is number of |
520 | bits, and "f" is flow control ("r" for RTS or |
521 | omit it). Default is "9600n8". |
522 | |
523 | See Documentation/serial-console.txt for more |
524 | information. See |
525 | Documentation/networking/netconsole.txt for an |
526 | alternative. |
527 | |
528 | uart[8250],io,<addr>[,options] |
529 | uart[8250],mmio,<addr>[,options] |
530 | Start an early, polled-mode console on the 8250/16550 |
531 | UART at the specified I/O port or MMIO address, |
532 | switching to the matching ttyS device later. The |
533 | options are the same as for ttyS, above. |
534 | |
535 | If the device connected to the port is not a TTY but a braille |
536 | device, prepend "brl," before the device type, for instance |
537 | console=brl,ttyS0 |
538 | For now, only VisioBraille is supported. |
539 | |
540 | consoleblank= [KNL] The console blank (screen saver) timeout in |
541 | seconds. Defaults to 10*60 = 10mins. A value of 0 |
542 | disables the blank timer. |
543 | |
544 | coredump_filter= |
545 | [KNL] Change the default value for |
546 | /proc/<pid>/coredump_filter. |
547 | See also Documentation/filesystems/proc.txt. |
548 | |
549 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
550 | Format: |
551 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
552 | |
553 | crashkernel=size[KMG][@offset[KMG]] |
554 | [KNL] Using kexec, Linux can switch to a 'crash kernel' |
555 | upon panic. This parameter reserves the physical |
556 | memory region [offset, offset + size] for that kernel |
557 | image. If '@offset' is omitted, then a suitable offset |
558 | is selected automatically. Check |
559 | Documentation/kdump/kdump.txt for further details. |
560 | |
561 | crashkernel=range1:size1[,range2:size2,...][@offset] |
562 | [KNL] Same as above, but depends on the memory |
563 | in the running system. The syntax of range is |
564 | start-[end] where start and end are both |
565 | a memory unit (amount[KMG]). See also |
566 | Documentation/kdump/kdump.txt for an example. |
567 | |
568 | cs89x0_dma= [HW,NET] |
569 | Format: <dma> |
570 | |
571 | cs89x0_media= [HW,NET] |
572 | Format: { rj45 | aui | bnc } |
573 | |
574 | dasd= [HW,NET] |
575 | See header of drivers/s390/block/dasd_devmap.c. |
576 | |
577 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port |
578 | (one device per port) |
579 | Format: <port#>,<type> |
580 | See also Documentation/input/joystick-parport.txt |
581 | |
582 | ddebug_query= [KNL,DYNAMIC_DEBUG] Enable debug messages at early boot |
583 | time. See Documentation/dynamic-debug-howto.txt for |
584 | details. |
585 | |
586 | debug [KNL] Enable kernel debugging (events log level). |
587 | |
588 | debug_locks_verbose= |
589 | [KNL] verbose self-tests |
590 | Format=<0|1> |
591 | Print debugging info while doing the locking API |
592 | self-tests. |
593 | We default to 0 (no extra messages), setting it to |
594 | 1 will print _a lot_ more information - normally |
595 | only useful to kernel developers. |
596 | |
597 | debug_objects [KNL] Enable object debugging |
598 | |
599 | no_debug_objects |
600 | [KNL] Disable object debugging |
601 | |
602 | debugpat [X86] Enable PAT debugging |
603 | |
604 | decnet.addr= [HW,NET] |
605 | Format: <area>[,<node>] |
606 | See also Documentation/networking/decnet.txt. |
607 | |
608 | default_hugepagesz= |
609 | [same as hugepagesz=] The size of the default |
610 | HugeTLB page size. This is the size represented by |
611 | the legacy /proc/ hugepages APIs, used for SHM, and |
612 | default size when mounting hugetlbfs filesystems. |
613 | Defaults to the default architecture's huge page size |
614 | if not specified. |
615 | |
616 | dhash_entries= [KNL] |
617 | Set number of hash buckets for dentry cache. |
618 | |
619 | digi= [HW,SERIAL] |
620 | IO parameters + enable/disable command. |
621 | |
622 | digiepca= [HW,SERIAL] |
623 | See drivers/char/README.epca and |
624 | Documentation/serial/digiepca.txt. |
625 | |
626 | disable= [IPV6] |
627 | See Documentation/networking/ipv6.txt. |
628 | |
629 | disable_ddw [PPC/PSERIES] |
630 | Disable Dynamic DMA Window support. Use this if |
631 | to workaround buggy firmware. |
632 | |
633 | disable_ipv6= [IPV6] |
634 | See Documentation/networking/ipv6.txt. |
635 | |
636 | disable_mtrr_cleanup [X86] |
637 | The kernel tries to adjust MTRR layout from continuous |
638 | to discrete, to make X server driver able to add WB |
639 | entry later. This parameter disables that. |
640 | |
641 | disable_mtrr_trim [X86, Intel and AMD only] |
642 | By default the kernel will trim any uncacheable |
643 | memory out of your available memory pool based on |
644 | MTRR settings. This parameter disables that behavior, |
645 | possibly causing your machine to run very slowly. |
646 | |
647 | disable_timer_pin_1 [X86] |
648 | Disable PIN 1 of APIC timer |
649 | Can be useful to work around chipset bugs. |
650 | |
651 | dma_debug=off If the kernel is compiled with DMA_API_DEBUG support, |
652 | this option disables the debugging code at boot. |
653 | |
654 | dma_debug_entries=<number> |
655 | This option allows to tune the number of preallocated |
656 | entries for DMA-API debugging code. One entry is |
657 | required per DMA-API allocation. Use this if the |
658 | DMA-API debugging code disables itself because the |
659 | architectural default is too low. |
660 | |
661 | dma_debug_driver=<driver_name> |
662 | With this option the DMA-API debugging driver |
663 | filter feature can be enabled at boot time. Just |
664 | pass the driver to filter for as the parameter. |
665 | The filter can be disabled or changed to another |
666 | driver later using sysfs. |
667 | |
668 | dscc4.setup= [NET] |
669 | |
670 | earlycon= [KNL] Output early console device and options. |
671 | uart[8250],io,<addr>[,options] |
672 | uart[8250],mmio,<addr>[,options] |
673 | uart[8250],mmio32,<addr>[,options] |
674 | Start an early, polled-mode console on the 8250/16550 |
675 | UART at the specified I/O port or MMIO address. |
676 | MMIO inter-register address stride is either 8bit (mmio) |
677 | or 32bit (mmio32). |
678 | The options are the same as for ttyS, above. |
679 | |
680 | earlyprintk= [X86,SH,BLACKFIN] |
681 | earlyprintk=vga |
682 | earlyprintk=serial[,ttySn[,baudrate]] |
683 | earlyprintk=ttySn[,baudrate] |
684 | earlyprintk=dbgp[debugController#] |
685 | |
686 | Append ",keep" to not disable it when the real console |
687 | takes over. |
688 | |
689 | Only vga or serial or usb debug port at a time. |
690 | |
691 | Currently only ttyS0 and ttyS1 are supported. |
692 | |
693 | Interaction with the standard serial driver is not |
694 | very good. |
695 | |
696 | The VGA output is eventually overwritten by the real |
697 | console. |
698 | |
699 | ekgdboc= [X86,KGDB] Allow early kernel console debugging |
700 | ekgdboc=kbd |
701 | |
702 | This is designed to be used in conjunction with |
703 | the boot argument: earlyprintk=vga |
704 | |
705 | edd= [EDD] |
706 | Format: {"off" | "on" | "skip[mbr]"} |
707 | |
708 | eisa_irq_edge= [PARISC,HW] |
709 | See header of drivers/parisc/eisa.c. |
710 | |
711 | elanfreq= [X86-32] |
712 | See comment before function elanfreq_setup() in |
713 | arch/x86/kernel/cpu/cpufreq/elanfreq.c. |
714 | |
715 | elevator= [IOSCHED] |
716 | Format: {"cfq" | "deadline" | "noop"} |
717 | See Documentation/block/as-iosched.txt and |
718 | Documentation/block/deadline-iosched.txt for details. |
719 | |
720 | elfcorehdr= [IA64,PPC,SH,X86] |
721 | Specifies physical address of start of kernel core |
722 | image elf header. Generally kexec loader will |
723 | pass this option to capture kernel. |
724 | See Documentation/kdump/kdump.txt for details. |
725 | |
726 | enable_mtrr_cleanup [X86] |
727 | The kernel tries to adjust MTRR layout from continuous |
728 | to discrete, to make X server driver able to add WB |
729 | entry later. This parameter enables that. |
730 | |
731 | enable_timer_pin_1 [X86] |
732 | Enable PIN 1 of APIC timer |
733 | Can be useful to work around chipset bugs |
734 | (in particular on some ATI chipsets). |
735 | The kernel tries to set a reasonable default. |
736 | |
737 | enforcing [SELINUX] Set initial enforcing status. |
738 | Format: {"0" | "1"} |
739 | See security/selinux/Kconfig help text. |
740 | 0 -- permissive (log only, no denials). |
741 | 1 -- enforcing (deny and log). |
742 | Default value is 0. |
743 | Value can be changed at runtime via /selinux/enforce. |
744 | |
745 | erst_disable [ACPI] |
746 | Disable Error Record Serialization Table (ERST) |
747 | support. |
748 | |
749 | ether= [HW,NET] Ethernet cards parameters |
750 | This option is obsoleted by the "netdev=" option, which |
751 | has equivalent usage. See its documentation for details. |
752 | |
753 | failslab= |
754 | fail_page_alloc= |
755 | fail_make_request=[KNL] |
756 | General fault injection mechanism. |
757 | Format: <interval>,<probability>,<space>,<times> |
758 | See also /Documentation/fault-injection/. |
759 | |
760 | floppy= [HW] |
761 | See Documentation/blockdev/floppy.txt. |
762 | |
763 | force_pal_cache_flush |
764 | [IA-64] Avoid check_sal_cache_flush which may hang on |
765 | buggy SAL_CACHE_FLUSH implementations. Using this |
766 | parameter will force ia64_sal_cache_flush to call |
767 | ia64_pal_cache_flush instead of SAL_CACHE_FLUSH. |
768 | |
769 | ftrace=[tracer] |
770 | [FTRACE] will set and start the specified tracer |
771 | as early as possible in order to facilitate early |
772 | boot debugging. |
773 | |
774 | ftrace_dump_on_oops[=orig_cpu] |
775 | [FTRACE] will dump the trace buffers on oops. |
776 | If no parameter is passed, ftrace will dump |
777 | buffers of all CPUs, but if you pass orig_cpu, it will |
778 | dump only the buffer of the CPU that triggered the |
779 | oops. |
780 | |
781 | ftrace_filter=[function-list] |
782 | [FTRACE] Limit the functions traced by the function |
783 | tracer at boot up. function-list is a comma separated |
784 | list of functions. This list can be changed at run |
785 | time by the set_ftrace_filter file in the debugfs |
786 | tracing directory. |
787 | |
788 | ftrace_notrace=[function-list] |
789 | [FTRACE] Do not trace the functions specified in |
790 | function-list. This list can be changed at run time |
791 | by the set_ftrace_notrace file in the debugfs |
792 | tracing directory. |
793 | |
794 | ftrace_graph_filter=[function-list] |
795 | [FTRACE] Limit the top level callers functions traced |
796 | by the function graph tracer at boot up. |
797 | function-list is a comma separated list of functions |
798 | that can be changed at run time by the |
799 | set_graph_function file in the debugfs tracing directory. |
800 | |
801 | gamecon.map[2|3]= |
802 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad |
803 | support via parallel port (up to 5 devices per port) |
804 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> |
805 | See also Documentation/input/joystick-parport.txt |
806 | |
807 | gamma= [HW,DRM] |
808 | |
809 | gart_fix_e820= [X86_64] disable the fix e820 for K8 GART |
810 | Format: off | on |
811 | default: on |
812 | |
813 | gcov_persist= [GCOV] When non-zero (default), profiling data for |
814 | kernel modules is saved and remains accessible via |
815 | debugfs, even when the module is unloaded/reloaded. |
816 | When zero, profiling data is discarded and associated |
817 | debugfs files are removed at module unload time. |
818 | |
819 | gpt [EFI] Forces disk with valid GPT signature but |
820 | invalid Protective MBR to be treated as GPT. |
821 | |
822 | hashdist= [KNL,NUMA] Large hashes allocated during boot |
823 | are distributed across NUMA nodes. Defaults on |
824 | for 64bit NUMA, off otherwise. |
825 | Format: 0 | 1 (for off | on) |
826 | |
827 | hcl= [IA-64] SGI's Hardware Graph compatibility layer |
828 | |
829 | hd= [EIDE] (E)IDE hard drive subsystem geometry |
830 | Format: <cyl>,<head>,<sect> |
831 | |
832 | hest_disable [ACPI] |
833 | Disable Hardware Error Source Table (HEST) support; |
834 | corresponding firmware-first mode error processing |
835 | logic will be disabled. |
836 | |
837 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact |
838 | size of <nn>. This works even on boxes that have no |
839 | highmem otherwise. This also works to reduce highmem |
840 | size on bigger boxes. |
841 | |
842 | highres= [KNL] Enable/disable high resolution timer mode. |
843 | Valid parameters: "on", "off" |
844 | Default: "on" |
845 | |
846 | hisax= [HW,ISDN] |
847 | See Documentation/isdn/README.HiSax. |
848 | |
849 | hlt [BUGS=ARM,SH] |
850 | |
851 | hpet= [X86-32,HPET] option to control HPET usage |
852 | Format: { enable (default) | disable | force | |
853 | verbose } |
854 | disable: disable HPET and use PIT instead |
855 | force: allow force enabled of undocumented chips (ICH4, |
856 | VIA, nVidia) |
857 | verbose: show contents of HPET registers during setup |
858 | |
859 | hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot. |
860 | hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages. |
861 | On x86-64 and powerpc, this option can be specified |
862 | multiple times interleaved with hugepages= to reserve |
863 | huge pages of different sizes. Valid pages sizes on |
864 | x86-64 are 2M (when the CPU supports "pse") and 1G |
865 | (when the CPU supports the "pdpe1gb" cpuinfo flag) |
866 | Note that 1GB pages can only be allocated at boot time |
867 | using hugepages= and not freed afterwards. |
868 | |
869 | hvc_iucv= [S390] Number of z/VM IUCV hypervisor console (HVC) |
870 | terminal devices. Valid values: 0..8 |
871 | hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs. |
872 | If specified, z/VM IUCV HVC accepts connections |
873 | from listed z/VM user IDs only. |
874 | |
875 | keep_bootcon [KNL] |
876 | Do not unregister boot console at start. This is only |
877 | useful for debugging when something happens in the window |
878 | between unregistering the boot console and initializing |
879 | the real console. |
880 | |
881 | i2c_bus= [HW] Override the default board specific I2C bus speed |
882 | or register an additional I2C bus that is not |
883 | registered from board initialization code. |
884 | Format: |
885 | <bus_id>,<clkrate> |
886 | |
887 | i8042.debug [HW] Toggle i8042 debug mode |
888 | i8042.direct [HW] Put keyboard port into non-translated mode |
889 | i8042.dumbkbd [HW] Pretend that controller can only read data from |
890 | keyboard and cannot control its state |
891 | (Don't attempt to blink the leds) |
892 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
893 | i8042.nokbd [HW] Don't check/create keyboard port |
894 | i8042.noloop [HW] Disable the AUX Loopback command while probing |
895 | for the AUX port |
896 | i8042.nomux [HW] Don't check presence of an active multiplexing |
897 | controller |
898 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX |
899 | controllers |
900 | i8042.notimeout [HW] Ignore timeout condition signalled by conroller |
901 | i8042.reset [HW] Reset the controller during init and cleanup |
902 | i8042.unlock [HW] Unlock (ignore) the keylock |
903 | |
904 | i810= [HW,DRM] |
905 | |
906 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
907 | indicates that the driver is running on unsupported |
908 | hardware. |
909 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
910 | does not match list of supported models. |
911 | i8k.power_status |
912 | [HW] Report power status in /proc/i8k |
913 | (disabled by default) |
914 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN |
915 | capability is set. |
916 | |
917 | icn= [HW,ISDN] |
918 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
919 | |
920 | ide-core.nodma= [HW] (E)IDE subsystem |
921 | Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc |
922 | .vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr |
923 | .cdrom .chs .ignore_cable are additional options |
924 | See Documentation/ide/ide.txt. |
925 | |
926 | ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem |
927 | Claim all unknown PCI IDE storage controllers. |
928 | |
929 | idle= [X86] |
930 | Format: idle=poll, idle=mwait, idle=halt, idle=nomwait |
931 | Poll forces a polling idle loop that can slightly |
932 | improve the performance of waking up a idle CPU, but |
933 | will use a lot of power and make the system run hot. |
934 | Not recommended. |
935 | idle=mwait: On systems which support MONITOR/MWAIT but |
936 | the kernel chose to not use it because it doesn't save |
937 | as much power as a normal idle loop, use the |
938 | MONITOR/MWAIT idle loop anyways. Performance should be |
939 | the same as idle=poll. |
940 | idle=halt: Halt is forced to be used for CPU idle. |
941 | In such case C2/C3 won't be used again. |
942 | idle=nomwait: Disable mwait for CPU C-states |
943 | |
944 | ignore_loglevel [KNL] |
945 | Ignore loglevel setting - this will print /all/ |
946 | kernel messages to the console. Useful for debugging. |
947 | |
948 | ihash_entries= [KNL] |
949 | Set number of hash buckets for inode cache. |
950 | |
951 | ima_audit= [IMA] |
952 | Format: { "0" | "1" } |
953 | 0 -- integrity auditing messages. (Default) |
954 | 1 -- enable informational integrity auditing messages. |
955 | |
956 | ima_hash= [IMA] |
957 | Format: { "sha1" | "md5" } |
958 | default: "sha1" |
959 | |
960 | ima_tcb [IMA] |
961 | Load a policy which meets the needs of the Trusted |
962 | Computing Base. This means IMA will measure all |
963 | programs exec'd, files mmap'd for exec, and all files |
964 | opened for read by uid=0. |
965 | |
966 | init= [KNL] |
967 | Format: <full_path> |
968 | Run specified binary instead of /sbin/init as init |
969 | process. |
970 | |
971 | initcall_debug [KNL] Trace initcalls as they are executed. Useful |
972 | for working out where the kernel is dying during |
973 | startup. |
974 | |
975 | initrd= [BOOT] Specify the location of the initial ramdisk |
976 | |
977 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver |
978 | Format: <irq> |
979 | |
980 | intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option |
981 | on |
982 | Enable intel iommu driver. |
983 | off |
984 | Disable intel iommu driver. |
985 | igfx_off [Default Off] |
986 | By default, gfx is mapped as normal device. If a gfx |
987 | device has a dedicated DMAR unit, the DMAR unit is |
988 | bypassed by not enabling DMAR with this option. In |
989 | this case, gfx device will use physical address for |
990 | DMA. |
991 | forcedac [x86_64] |
992 | With this option iommu will not optimize to look |
993 | for io virtual address below 32 bit forcing dual |
994 | address cycle on pci bus for cards supporting greater |
995 | than 32 bit addressing. The default is to look |
996 | for translation below 32 bit and if not available |
997 | then look in the higher range. |
998 | strict [Default Off] |
999 | With this option on every unmap_single operation will |
1000 | result in a hardware IOTLB flush operation as opposed |
1001 | to batching them for performance. |
1002 | sp_off [Default Off] |
1003 | By default, super page will be supported if Intel IOMMU |
1004 | has the capability. With this option, super page will |
1005 | not be supported. |
1006 | intremap= [X86-64, Intel-IOMMU] |
1007 | Format: { on (default) | off | nosid } |
1008 | on enable Interrupt Remapping (default) |
1009 | off disable Interrupt Remapping |
1010 | nosid disable Source ID checking |
1011 | |
1012 | inttest= [IA64] |
1013 | |
1014 | iomem= Disable strict checking of access to MMIO memory |
1015 | strict regions from userspace. |
1016 | relaxed |
1017 | |
1018 | iommu= [x86] |
1019 | off |
1020 | force |
1021 | noforce |
1022 | biomerge |
1023 | panic |
1024 | nopanic |
1025 | merge |
1026 | nomerge |
1027 | forcesac |
1028 | soft |
1029 | pt [x86, IA64] |
1030 | |
1031 | io7= [HW] IO7 for Marvel based alpha systems |
1032 | See comment before marvel_specify_io7 in |
1033 | arch/alpha/kernel/core_marvel.c. |
1034 | |
1035 | io_delay= [X86] I/O delay method |
1036 | 0x80 |
1037 | Standard port 0x80 based delay |
1038 | 0xed |
1039 | Alternate port 0xed based delay (needed on some systems) |
1040 | udelay |
1041 | Simple two microseconds delay |
1042 | none |
1043 | No delay |
1044 | |
1045 | ip= [IP_PNP] |
1046 | See Documentation/filesystems/nfs/nfsroot.txt. |
1047 | |
1048 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
1049 | See comment before ip2_setup() in |
1050 | drivers/char/ip2/ip2base.c. |
1051 | |
1052 | irqfixup [HW] |
1053 | When an interrupt is not handled search all handlers |
1054 | for it. Intended to get systems with badly broken |
1055 | firmware running. |
1056 | |
1057 | irqpoll [HW] |
1058 | When an interrupt is not handled search all handlers |
1059 | for it. Also check all handlers each timer |
1060 | interrupt. Intended to get systems with badly broken |
1061 | firmware running. |
1062 | |
1063 | isapnp= [ISAPNP] |
1064 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
1065 | |
1066 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
1067 | Format: |
1068 | <cpu number>,...,<cpu number> |
1069 | or |
1070 | <cpu number>-<cpu number> |
1071 | (must be a positive range in ascending order) |
1072 | or a mixture |
1073 | <cpu number>,...,<cpu number>-<cpu number> |
1074 | |
1075 | This option can be used to specify one or more CPUs |
1076 | to isolate from the general SMP balancing and scheduling |
1077 | algorithms. You can move a process onto or off an |
1078 | "isolated" CPU via the CPU affinity syscalls or cpuset. |
1079 | <cpu number> begins at 0 and the maximum value is |
1080 | "number of CPUs in system - 1". |
1081 | |
1082 | This option is the preferred way to isolate CPUs. The |
1083 | alternative -- manually setting the CPU mask of all |
1084 | tasks in the system -- can cause problems and |
1085 | suboptimal load balancer performance. |
1086 | |
1087 | iucv= [HW,NET] |
1088 | |
1089 | js= [HW,JOY] Analog joystick |
1090 | See Documentation/input/joystick.txt. |
1091 | |
1092 | keepinitrd [HW,ARM] |
1093 | |
1094 | kernelcore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
1095 | specifies the amount of memory usable by the kernel |
1096 | for non-movable allocations. The requested amount is |
1097 | spread evenly throughout all nodes in the system. The |
1098 | remaining memory in each node is used for Movable |
1099 | pages. In the event, a node is too small to have both |
1100 | kernelcore and Movable pages, kernelcore pages will |
1101 | take priority and other nodes will have a larger number |
1102 | of kernelcore pages. The Movable zone is used for the |
1103 | allocation of pages that may be reclaimed or moved |
1104 | by the page migration subsystem. This means that |
1105 | HugeTLB pages may not be allocated from this zone. |
1106 | Note that allocations like PTEs-from-HighMem still |
1107 | use the HighMem zone if it exists, and the Normal |
1108 | zone if it does not. |
1109 | |
1110 | kgdbdbgp= [KGDB,HW] kgdb over EHCI usb debug port. |
1111 | Format: <Controller#>[,poll interval] |
1112 | The controller # is the number of the ehci usb debug |
1113 | port as it is probed via PCI. The poll interval is |
1114 | optional and is the number seconds in between |
1115 | each poll cycle to the debug port in case you need |
1116 | the functionality for interrupting the kernel with |
1117 | gdb or control-c on the dbgp connection. When |
1118 | not using this parameter you use sysrq-g to break into |
1119 | the kernel debugger. |
1120 | |
1121 | kgdboc= [KGDB,HW] kgdb over consoles. |
1122 | Requires a tty driver that supports console polling, |
1123 | or a supported polling keyboard driver (non-usb). |
1124 | Serial only format: <serial_device>[,baud] |
1125 | keyboard only format: kbd |
1126 | keyboard and serial format: kbd,<serial_device>[,baud] |
1127 | Optional Kernel mode setting: |
1128 | kms, kbd format: kms,kbd |
1129 | kms, kbd and serial format: kms,kbd,<ser_dev>[,baud] |
1130 | |
1131 | kgdbwait [KGDB] Stop kernel execution and enter the |
1132 | kernel debugger at the earliest opportunity. |
1133 | |
1134 | kmac= [MIPS] korina ethernet MAC address. |
1135 | Configure the RouterBoard 532 series on-chip |
1136 | Ethernet adapter MAC address. |
1137 | |
1138 | kmemleak= [KNL] Boot-time kmemleak enable/disable |
1139 | Valid arguments: on, off |
1140 | Default: on |
1141 | |
1142 | kstack=N [X86] Print N words from the kernel stack |
1143 | in oops dumps. |
1144 | |
1145 | kvm.ignore_msrs=[KVM] Ignore guest accesses to unhandled MSRs. |
1146 | Default is 0 (don't ignore, but inject #GP) |
1147 | |
1148 | kvm.oos_shadow= [KVM] Disable out-of-sync shadow paging. |
1149 | Default is 1 (enabled) |
1150 | |
1151 | kvm.mmu_audit= [KVM] This is a R/W parameter which allows audit |
1152 | KVM MMU at runtime. |
1153 | Default is 0 (off) |
1154 | |
1155 | kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM. |
1156 | Default is 1 (enabled) |
1157 | |
1158 | kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU) |
1159 | for all guests. |
1160 | Default is 1 (enabled) if in 64bit or 32bit-PAE mode |
1161 | |
1162 | kvm-intel.bypass_guest_pf= |
1163 | [KVM,Intel] Disables bypassing of guest page faults |
1164 | on Intel chips. Default is 1 (enabled) |
1165 | |
1166 | kvm-intel.ept= [KVM,Intel] Disable extended page tables |
1167 | (virtualized MMU) support on capable Intel chips. |
1168 | Default is 1 (enabled) |
1169 | |
1170 | kvm-intel.emulate_invalid_guest_state= |
1171 | [KVM,Intel] Enable emulation of invalid guest states |
1172 | Default is 0 (disabled) |
1173 | |
1174 | kvm-intel.flexpriority= |
1175 | [KVM,Intel] Disable FlexPriority feature (TPR shadow). |
1176 | Default is 1 (enabled) |
1177 | |
1178 | kvm-intel.unrestricted_guest= |
1179 | [KVM,Intel] Disable unrestricted guest feature |
1180 | (virtualized real and unpaged mode) on capable |
1181 | Intel chips. Default is 1 (enabled) |
1182 | |
1183 | kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification |
1184 | feature (tagged TLBs) on capable Intel chips. |
1185 | Default is 1 (enabled) |
1186 | |
1187 | l2cr= [PPC] |
1188 | |
1189 | l3cr= [PPC] |
1190 | |
1191 | lapic [X86-32,APIC] Enable the local APIC even if BIOS |
1192 | disabled it. |
1193 | |
1194 | lapic_timer_c2_ok [X86,APIC] trust the local apic timer |
1195 | in C2 power state. |
1196 | |
1197 | libata.dma= [LIBATA] DMA control |
1198 | libata.dma=0 Disable all PATA and SATA DMA |
1199 | libata.dma=1 PATA and SATA Disk DMA only |
1200 | libata.dma=2 ATAPI (CDROM) DMA only |
1201 | libata.dma=4 Compact Flash DMA only |
1202 | Combinations also work, so libata.dma=3 enables DMA |
1203 | for disks and CDROMs, but not CFs. |
1204 | |
1205 | libata.ignore_hpa= [LIBATA] Ignore HPA limit |
1206 | libata.ignore_hpa=0 keep BIOS limits (default) |
1207 | libata.ignore_hpa=1 ignore limits, using full disk |
1208 | |
1209 | libata.noacpi [LIBATA] Disables use of ACPI in libata suspend/resume |
1210 | when set. |
1211 | Format: <int> |
1212 | |
1213 | libata.force= [LIBATA] Force configurations. The format is comma |
1214 | separated list of "[ID:]VAL" where ID is |
1215 | PORT[.DEVICE]. PORT and DEVICE are decimal numbers |
1216 | matching port, link or device. Basically, it matches |
1217 | the ATA ID string printed on console by libata. If |
1218 | the whole ID part is omitted, the last PORT and DEVICE |
1219 | values are used. If ID hasn't been specified yet, the |
1220 | configuration applies to all ports, links and devices. |
1221 | |
1222 | If only DEVICE is omitted, the parameter applies to |
1223 | the port and all links and devices behind it. DEVICE |
1224 | number of 0 either selects the first device or the |
1225 | first fan-out link behind PMP device. It does not |
1226 | select the host link. DEVICE number of 15 selects the |
1227 | host link and device attached to it. |
1228 | |
1229 | The VAL specifies the configuration to force. As long |
1230 | as there's no ambiguity shortcut notation is allowed. |
1231 | For example, both 1.5 and 1.5G would work for 1.5Gbps. |
1232 | The following configurations can be forced. |
1233 | |
1234 | * Cable type: 40c, 80c, short40c, unk, ign or sata. |
1235 | Any ID with matching PORT is used. |
1236 | |
1237 | * SATA link speed limit: 1.5Gbps or 3.0Gbps. |
1238 | |
1239 | * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7]. |
1240 | udma[/][16,25,33,44,66,100,133] notation is also |
1241 | allowed. |
1242 | |
1243 | * [no]ncq: Turn on or off NCQ. |
1244 | |
1245 | * nohrst, nosrst, norst: suppress hard, soft |
1246 | and both resets. |
1247 | |
1248 | * dump_id: dump IDENTIFY data. |
1249 | |
1250 | If there are multiple matching configurations changing |
1251 | the same attribute, the last one is used. |
1252 | |
1253 | memblock=debug [KNL] Enable memblock debug messages. |
1254 | |
1255 | load_ramdisk= [RAM] List of ramdisks to load from floppy |
1256 | See Documentation/blockdev/ramdisk.txt. |
1257 | |
1258 | lockd.nlm_grace_period=P [NFS] Assign grace period. |
1259 | Format: <integer> |
1260 | |
1261 | lockd.nlm_tcpport=N [NFS] Assign TCP port. |
1262 | Format: <integer> |
1263 | |
1264 | lockd.nlm_timeout=T [NFS] Assign timeout value. |
1265 | Format: <integer> |
1266 | |
1267 | lockd.nlm_udpport=M [NFS] Assign UDP port. |
1268 | Format: <integer> |
1269 | |
1270 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver |
1271 | Format: <irq> |
1272 | |
1273 | loglevel= All Kernel Messages with a loglevel smaller than the |
1274 | console loglevel will be printed to the console. It can |
1275 | also be changed with klogd or other programs. The |
1276 | loglevels are defined as follows: |
1277 | |
1278 | 0 (KERN_EMERG) system is unusable |
1279 | 1 (KERN_ALERT) action must be taken immediately |
1280 | 2 (KERN_CRIT) critical conditions |
1281 | 3 (KERN_ERR) error conditions |
1282 | 4 (KERN_WARNING) warning conditions |
1283 | 5 (KERN_NOTICE) normal but significant condition |
1284 | 6 (KERN_INFO) informational |
1285 | 7 (KERN_DEBUG) debug-level messages |
1286 | |
1287 | log_buf_len=n[KMG] Sets the size of the printk ring buffer, |
1288 | in bytes. n must be a power of two. The default |
1289 | size is set in the kernel config file. |
1290 | |
1291 | logo.nologo [FB] Disables display of the built-in Linux logo. |
1292 | This may be used to provide more screen space for |
1293 | kernel log messages and is useful when debugging |
1294 | kernel boot problems. |
1295 | |
1296 | lp=0 [LP] Specify parallel ports to use, e.g, |
1297 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses |
1298 | lp=reset first parallel port). 'lp=0' disables the |
1299 | lp=auto printer driver. 'lp=reset' (which can be |
1300 | specified in addition to the ports) causes |
1301 | attached printers to be reset. Using |
1302 | lp=port1,port2,... specifies the parallel ports |
1303 | to associate lp devices with, starting with |
1304 | lp0. A port specification may be 'none' to skip |
1305 | that lp device, or a parport name such as |
1306 | 'parport0'. Specifying 'lp=auto' instead of a |
1307 | port specification list means that device IDs |
1308 | from each port should be examined, to see if |
1309 | an IEEE 1284-compliant printer is attached; if |
1310 | so, the driver will manage that printer. |
1311 | See also header of drivers/char/lp.c. |
1312 | |
1313 | lpj=n [KNL] |
1314 | Sets loops_per_jiffy to given constant, thus avoiding |
1315 | time-consuming boot-time autodetection (up to 250 ms per |
1316 | CPU). 0 enables autodetection (default). To determine |
1317 | the correct value for your kernel, boot with normal |
1318 | autodetection and see what value is printed. Note that |
1319 | on SMP systems the preset will be applied to all CPUs, |
1320 | which is likely to cause problems if your CPUs need |
1321 | significantly divergent settings. An incorrect value |
1322 | will cause delays in the kernel to be wrong, leading to |
1323 | unpredictable I/O errors and other breakage. Although |
1324 | unlikely, in the extreme case this might damage your |
1325 | hardware. |
1326 | |
1327 | ltpc= [NET] |
1328 | Format: <io>,<irq>,<dma> |
1329 | |
1330 | machvec= [IA64] Force the use of a particular machine-vector |
1331 | (machvec) in a generic kernel. |
1332 | Example: machvec=hpzx1_swiotlb |
1333 | |
1334 | machtype= [Loongson] Share the same kernel image file between different |
1335 | yeeloong laptop. |
1336 | Example: machtype=lemote-yeeloong-2f-7inch |
1337 | |
1338 | max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater |
1339 | than or equal to this physical address is ignored. |
1340 | |
1341 | maxcpus= [SMP] Maximum number of processors that an SMP kernel |
1342 | should make use of. maxcpus=n : n >= 0 limits the |
1343 | kernel to using 'n' processors. n=0 is a special case, |
1344 | it is equivalent to "nosmp", which also disables |
1345 | the IO APIC. |
1346 | |
1347 | max_loop= [LOOP] Maximum number of loopback devices that can |
1348 | be mounted |
1349 | Format: <1-256> |
1350 | |
1351 | mcatest= [IA-64] |
1352 | |
1353 | mce [X86-32] Machine Check Exception |
1354 | |
1355 | mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt |
1356 | |
1357 | md= [HW] RAID subsystems devices and level |
1358 | See Documentation/md.txt. |
1359 | |
1360 | mdacon= [MDA] |
1361 | Format: <first>,<last> |
1362 | Specifies range of consoles to be captured by the MDA. |
1363 | |
1364 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory |
1365 | Amount of memory to be used when the kernel is not able |
1366 | to see the whole system memory or for test. |
1367 | [X86-32] Use together with memmap= to avoid physical |
1368 | address space collisions. Without memmap= PCI devices |
1369 | could be placed at addresses belonging to unused RAM. |
1370 | |
1371 | mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel |
1372 | memory. |
1373 | |
1374 | memchunk=nn[KMG] |
1375 | [KNL,SH] Allow user to override the default size for |
1376 | per-device physically contiguous DMA buffers. |
1377 | |
1378 | memmap=exactmap [KNL,X86] Enable setting of an exact |
1379 | E820 memory map, as specified by the user. |
1380 | Such memmap=exactmap lines can be constructed based on |
1381 | BIOS output or other requirements. See the memmap=nn@ss |
1382 | option description. |
1383 | |
1384 | memmap=nn[KMG]@ss[KMG] |
1385 | [KNL] Force usage of a specific region of memory |
1386 | Region of memory to be used, from ss to ss+nn. |
1387 | |
1388 | memmap=nn[KMG]#ss[KMG] |
1389 | [KNL,ACPI] Mark specific memory as ACPI data. |
1390 | Region of memory to be used, from ss to ss+nn. |
1391 | |
1392 | memmap=nn[KMG]$ss[KMG] |
1393 | [KNL,ACPI] Mark specific memory as reserved. |
1394 | Region of memory to be used, from ss to ss+nn. |
1395 | Example: Exclude memory from 0x18690000-0x1869ffff |
1396 | memmap=64K$0x18690000 |
1397 | or |
1398 | memmap=0x10000$0x18690000 |
1399 | |
1400 | memory_corruption_check=0/1 [X86] |
1401 | Some BIOSes seem to corrupt the first 64k of |
1402 | memory when doing things like suspend/resume. |
1403 | Setting this option will scan the memory |
1404 | looking for corruption. Enabling this will |
1405 | both detect corruption and prevent the kernel |
1406 | from using the memory being corrupted. |
1407 | However, its intended as a diagnostic tool; if |
1408 | repeatable BIOS-originated corruption always |
1409 | affects the same memory, you can use memmap= |
1410 | to prevent the kernel from using that memory. |
1411 | |
1412 | memory_corruption_check_size=size [X86] |
1413 | By default it checks for corruption in the low |
1414 | 64k, making this memory unavailable for normal |
1415 | use. Use this parameter to scan for |
1416 | corruption in more or less memory. |
1417 | |
1418 | memory_corruption_check_period=seconds [X86] |
1419 | By default it checks for corruption every 60 |
1420 | seconds. Use this parameter to check at some |
1421 | other rate. 0 disables periodic checking. |
1422 | |
1423 | memtest= [KNL,X86] Enable memtest |
1424 | Format: <integer> |
1425 | default : 0 <disable> |
1426 | Specifies the number of memtest passes to be |
1427 | performed. Each pass selects another test |
1428 | pattern from a given set of patterns. Memtest |
1429 | fills the memory with this pattern, validates |
1430 | memory contents and reserves bad memory |
1431 | regions that are detected. |
1432 | |
1433 | meye.*= [HW] Set MotionEye Camera parameters |
1434 | See Documentation/video4linux/meye.txt. |
1435 | |
1436 | mfgpt_irq= [IA-32] Specify the IRQ to use for the |
1437 | Multi-Function General Purpose Timers on AMD Geode |
1438 | platforms. |
1439 | |
1440 | mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when |
1441 | the BIOS has incorrectly applied a workaround. TinyBIOS |
1442 | version 0.98 is known to be affected, 0.99 fixes the |
1443 | problem by letting the user disable the workaround. |
1444 | |
1445 | mga= [HW,DRM] |
1446 | |
1447 | min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this |
1448 | physical address is ignored. |
1449 | |
1450 | mini2440= [ARM,HW,KNL] |
1451 | Format:[0..2][b][c][t] |
1452 | Default: "0tb" |
1453 | MINI2440 configuration specification: |
1454 | 0 - The attached screen is the 3.5" TFT |
1455 | 1 - The attached screen is the 7" TFT |
1456 | 2 - The VGA Shield is attached (1024x768) |
1457 | Leaving out the screen size parameter will not load |
1458 | the TFT driver, and the framebuffer will be left |
1459 | unconfigured. |
1460 | b - Enable backlight. The TFT backlight pin will be |
1461 | linked to the kernel VESA blanking code and a GPIO |
1462 | LED. This parameter is not necessary when using the |
1463 | VGA shield. |
1464 | c - Enable the s3c camera interface. |
1465 | t - Reserved for enabling touchscreen support. The |
1466 | touchscreen support is not enabled in the mainstream |
1467 | kernel as of 2.6.30, a preliminary port can be found |
1468 | in the "bleeding edge" mini2440 support kernel at |
1469 | http://repo.or.cz/w/linux-2.6/mini2440.git |
1470 | |
1471 | mminit_loglevel= |
1472 | [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this |
1473 | parameter allows control of the logging verbosity for |
1474 | the additional memory initialisation checks. A value |
1475 | of 0 disables mminit logging and a level of 4 will |
1476 | log everything. Information is printed at KERN_DEBUG |
1477 | so loglevel=8 may also need to be specified. |
1478 | |
1479 | mousedev.tap_time= |
1480 | [MOUSE] Maximum time between finger touching and |
1481 | leaving touchpad surface for touch to be considered |
1482 | a tap and be reported as a left button click (for |
1483 | touchpads working in absolute mode only). |
1484 | Format: <msecs> |
1485 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices |
1486 | reporting absolute coordinates, such as tablets |
1487 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices |
1488 | reporting absolute coordinates, such as tablets |
1489 | |
1490 | movablecore=nn[KMG] [KNL,X86,IA-64,PPC] This parameter |
1491 | is similar to kernelcore except it specifies the |
1492 | amount of memory used for migratable allocations. |
1493 | If both kernelcore and movablecore is specified, |
1494 | then kernelcore will be at *least* the specified |
1495 | value but may be more. If movablecore on its own |
1496 | is specified, the administrator must be careful |
1497 | that the amount of memory usable for all allocations |
1498 | is not too small. |
1499 | |
1500 | MTD_Partition= [MTD] |
1501 | Format: <name>,<region-number>,<size>,<offset> |
1502 | |
1503 | MTD_Region= [MTD] Format: |
1504 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
1505 | |
1506 | mtdparts= [MTD] |
1507 | See drivers/mtd/cmdlinepart.c. |
1508 | |
1509 | multitce=off [PPC] This parameter disables the use of the pSeries |
1510 | firmware feature for updating multiple TCE entries |
1511 | at a time. |
1512 | |
1513 | onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration |
1514 | |
1515 | Format: [die0_boundary][,die0_lock][,die1_boundary][,die1_lock] |
1516 | |
1517 | boundary - index of last SLC block on Flex-OneNAND. |
1518 | The remaining blocks are configured as MLC blocks. |
1519 | lock - Configure if Flex-OneNAND boundary should be locked. |
1520 | Once locked, the boundary cannot be changed. |
1521 | 1 indicates lock status, 0 indicates unlock status. |
1522 | |
1523 | mtdset= [ARM] |
1524 | ARM/S3C2412 JIVE boot control |
1525 | |
1526 | See arch/arm/mach-s3c2412/mach-jive.c |
1527 | |
1528 | mtouchusb.raw_coordinates= |
1529 | [HW] Make the MicroTouch USB driver use raw coordinates |
1530 | ('y', default) or cooked coordinates ('n') |
1531 | |
1532 | mtrr_chunk_size=nn[KMG] [X86] |
1533 | used for mtrr cleanup. It is largest continuous chunk |
1534 | that could hold holes aka. UC entries. |
1535 | |
1536 | mtrr_gran_size=nn[KMG] [X86] |
1537 | Used for mtrr cleanup. It is granularity of mtrr block. |
1538 | Default is 1. |
1539 | Large value could prevent small alignment from |
1540 | using up MTRRs. |
1541 | |
1542 | mtrr_spare_reg_nr=n [X86] |
1543 | Format: <integer> |
1544 | Range: 0,7 : spare reg number |
1545 | Default : 1 |
1546 | Used for mtrr cleanup. It is spare mtrr entries number. |
1547 | Set to 2 or more if your graphical card needs more. |
1548 | |
1549 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
1550 | |
1551 | netdev= [NET] Network devices parameters |
1552 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> |
1553 | Note that mem_start is often overloaded to mean |
1554 | something different and driver-specific. |
1555 | This usage is only documented in each driver source |
1556 | file if at all. |
1557 | |
1558 | nf_conntrack.acct= |
1559 | [NETFILTER] Enable connection tracking flow accounting |
1560 | 0 to disable accounting |
1561 | 1 to enable accounting |
1562 | Default value is 0. |
1563 | |
1564 | nfsaddrs= [NFS] Deprecated. Use ip= instead. |
1565 | See Documentation/filesystems/nfs/nfsroot.txt. |
1566 | |
1567 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
1568 | See Documentation/filesystems/nfs/nfsroot.txt. |
1569 | |
1570 | nfsrootdebug [NFS] enable nfsroot debugging messages. |
1571 | See Documentation/filesystems/nfs/nfsroot.txt. |
1572 | |
1573 | nfs.callback_tcpport= |
1574 | [NFS] set the TCP port on which the NFSv4 callback |
1575 | channel should listen. |
1576 | |
1577 | nfs.cache_getent= |
1578 | [NFS] sets the pathname to the program which is used |
1579 | to update the NFS client cache entries. |
1580 | |
1581 | nfs.cache_getent_timeout= |
1582 | [NFS] sets the timeout after which an attempt to |
1583 | update a cache entry is deemed to have failed. |
1584 | |
1585 | nfs.idmap_cache_timeout= |
1586 | [NFS] set the maximum lifetime for idmapper cache |
1587 | entries. |
1588 | |
1589 | nfs.enable_ino64= |
1590 | [NFS] enable 64-bit inode numbers. |
1591 | If zero, the NFS client will fake up a 32-bit inode |
1592 | number for the readdir() and stat() syscalls instead |
1593 | of returning the full 64-bit number. |
1594 | The default is to return 64-bit inode numbers. |
1595 | |
1596 | nfs.nfs4_disable_idmapping= |
1597 | [NFSv4] When set, this option disables the NFSv4 |
1598 | idmapper on the client, but only if the mount |
1599 | is using the 'sec=sys' security flavour. This may |
1600 | make migration from legacy NFSv2/v3 systems easier |
1601 | provided that the server has the appropriate support. |
1602 | The default is to always enable NFSv4 idmapping. |
1603 | |
1604 | nmi_debug= [KNL,AVR32,SH] Specify one or more actions to take |
1605 | when a NMI is triggered. |
1606 | Format: [state][,regs][,debounce][,die] |
1607 | |
1608 | nmi_watchdog= [KNL,BUGS=X86] Debugging features for SMP kernels |
1609 | Format: [panic,][nopanic,][num] |
1610 | Valid num: 0 |
1611 | 0 - turn nmi_watchdog off |
1612 | When panic is specified, panic when an NMI watchdog |
1613 | timeout occurs (or 'nopanic' to override the opposite |
1614 | default). |
1615 | This is useful when you use a panic=... timeout and |
1616 | need the box quickly up again. |
1617 | |
1618 | netpoll.carrier_timeout= |
1619 | [NET] Specifies amount of time (in seconds) that |
1620 | netpoll should wait for a carrier. By default netpoll |
1621 | waits 4 seconds. |
1622 | |
1623 | no387 [BUGS=X86-32] Tells the kernel to use the 387 maths |
1624 | emulation library even if a 387 maths coprocessor |
1625 | is present. |
1626 | |
1627 | no_console_suspend |
1628 | [HW] Never suspend the console |
1629 | Disable suspending of consoles during suspend and |
1630 | hibernate operations. Once disabled, debugging |
1631 | messages can reach various consoles while the rest |
1632 | of the system is being put to sleep (ie, while |
1633 | debugging driver suspend/resume hooks). This may |
1634 | not work reliably with all consoles, but is known |
1635 | to work with serial and VGA consoles. |
1636 | |
1637 | noaliencache [MM, NUMA, SLAB] Disables the allocation of alien |
1638 | caches in the slab allocator. Saves per-node memory, |
1639 | but will impact performance. |
1640 | |
1641 | noalign [KNL,ARM] |
1642 | |
1643 | noapic [SMP,APIC] Tells the kernel to not make use of any |
1644 | IOAPICs that may be present in the system. |
1645 | |
1646 | noautogroup Disable scheduler automatic task group creation. |
1647 | |
1648 | nobats [PPC] Do not use BATs for mapping kernel lowmem |
1649 | on "Classic" PPC cores. |
1650 | |
1651 | nocache [ARM] |
1652 | |
1653 | noclflush [BUGS=X86] Don't use the CLFLUSH instruction |
1654 | |
1655 | nodelayacct [KNL] Disable per-task delay accounting |
1656 | |
1657 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
1658 | |
1659 | nodsp [SH] Disable hardware DSP at boot time. |
1660 | |
1661 | noefi [X86] Disable EFI runtime services support. |
1662 | |
1663 | noexec [IA-64] |
1664 | |
1665 | noexec [X86] |
1666 | On X86-32 available only on PAE configured kernels. |
1667 | noexec=on: enable non-executable mappings (default) |
1668 | noexec=off: disable non-executable mappings |
1669 | |
1670 | nosmep [X86] |
1671 | Disable SMEP (Supervisor Mode Execution Protection) |
1672 | even if it is supported by processor. |
1673 | |
1674 | noexec32 [X86-64] |
1675 | This affects only 32-bit executables. |
1676 | noexec32=on: enable non-executable mappings (default) |
1677 | read doesn't imply executable mappings |
1678 | noexec32=off: disable non-executable mappings |
1679 | read implies executable mappings |
1680 | |
1681 | nofpu [SH] Disable hardware FPU at boot time. |
1682 | |
1683 | nofxsr [BUGS=X86-32] Disables x86 floating point extended |
1684 | register save and restore. The kernel will only save |
1685 | legacy floating-point registers on task switch. |
1686 | |
1687 | noxsave [BUGS=X86] Disables x86 extended register state save |
1688 | and restore using xsave. The kernel will fallback to |
1689 | enabling legacy floating-point and sse state. |
1690 | |
1691 | nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or |
1692 | wfi(ARM) instruction doesn't work correctly and not to |
1693 | use it. This is also useful when using JTAG debugger. |
1694 | |
1695 | no-hlt [BUGS=X86-32] Tells the kernel that the hlt |
1696 | instruction doesn't work correctly and not to |
1697 | use it. |
1698 | |
1699 | no_file_caps Tells the kernel not to honor file capabilities. The |
1700 | only way then for a file to be executed with privilege |
1701 | is to be setuid root or executed by root. |
1702 | |
1703 | nohalt [IA-64] Tells the kernel not to use the power saving |
1704 | function PAL_HALT_LIGHT when idle. This increases |
1705 | power-consumption. On the positive side, it reduces |
1706 | interrupt wake-up latency, which may improve performance |
1707 | in certain environments such as networked servers or |
1708 | real-time systems. |
1709 | |
1710 | nohz= [KNL] Boottime enable/disable dynamic ticks |
1711 | Valid arguments: on, off |
1712 | Default: on |
1713 | |
1714 | noiotrap [SH] Disables trapped I/O port accesses. |
1715 | |
1716 | noirqdebug [X86-32] Disables the code which attempts to detect and |
1717 | disable unhandled interrupt sources. |
1718 | |
1719 | no_timer_check [X86,APIC] Disables the code which tests for |
1720 | broken timer IRQ sources. |
1721 | |
1722 | noisapnp [ISAPNP] Disables ISA PnP code. |
1723 | |
1724 | noinitrd [RAM] Tells the kernel not to load any configured |
1725 | initial RAM disk. |
1726 | |
1727 | nointremap [X86-64, Intel-IOMMU] Do not enable interrupt |
1728 | remapping. |
1729 | [Deprecated - use intremap=off] |
1730 | |
1731 | nointroute [IA-64] |
1732 | |
1733 | nojitter [IA64] Disables jitter checking for ITC timers. |
1734 | |
1735 | no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver |
1736 | |
1737 | no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page |
1738 | fault handling. |
1739 | |
1740 | nolapic [X86-32,APIC] Do not enable or use the local APIC. |
1741 | |
1742 | nolapic_timer [X86-32,APIC] Do not use the local APIC timer. |
1743 | |
1744 | noltlbs [PPC] Do not use large page/tlb entries for kernel |
1745 | lowmem mapping on PPC40x. |
1746 | |
1747 | nomca [IA-64] Disable machine check abort handling |
1748 | |
1749 | nomce [X86-32] Machine Check Exception |
1750 | |
1751 | nomfgpt [X86-32] Disable Multi-Function General Purpose |
1752 | Timer usage (for AMD Geode machines). |
1753 | |
1754 | nopat [X86] Disable PAT (page attribute table extension of |
1755 | pagetables) support. |
1756 | |
1757 | norandmaps Don't use address space randomization. Equivalent to |
1758 | echo 0 > /proc/sys/kernel/randomize_va_space |
1759 | |
1760 | noreplace-paravirt [X86,IA-64,PV_OPS] Don't patch paravirt_ops |
1761 | |
1762 | noreplace-smp [X86-32,SMP] Don't replace SMP instructions |
1763 | with UP alternatives |
1764 | |
1765 | noresidual [PPC] Don't use residual data on PReP machines. |
1766 | |
1767 | noresume [SWSUSP] Disables resume and restores original swap |
1768 | space. |
1769 | |
1770 | no-scroll [VGA] Disables scrollback. |
1771 | This is required for the Braillex ib80-piezo Braille |
1772 | reader made by F.H. Papenmeier (Germany). |
1773 | |
1774 | nosbagart [IA-64] |
1775 | |
1776 | nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support. |
1777 | |
1778 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel, |
1779 | and disable the IO APIC. legacy for "maxcpus=0". |
1780 | |
1781 | nosoftlockup [KNL] Disable the soft-lockup detector. |
1782 | |
1783 | nosync [HW,M68K] Disables sync negotiation for all devices. |
1784 | |
1785 | notsc [BUGS=X86-32] Disable Time Stamp Counter |
1786 | |
1787 | nousb [USB] Disable the USB subsystem |
1788 | |
1789 | nowatchdog [KNL] Disable the lockup detector (NMI watchdog). |
1790 | |
1791 | nowb [ARM] |
1792 | |
1793 | nox2apic [X86-64,APIC] Do not enable x2APIC mode. |
1794 | |
1795 | nptcg= [IA64] Override max number of concurrent global TLB |
1796 | purges which is reported from either PAL_VM_SUMMARY or |
1797 | SAL PALO. |
1798 | |
1799 | nr_cpus= [SMP] Maximum number of processors that an SMP kernel |
1800 | could support. nr_cpus=n : n >= 1 limits the kernel to |
1801 | supporting 'n' processors. Later in runtime you can not |
1802 | use hotplug cpu feature to put more cpu back to online. |
1803 | just like you compile the kernel NR_CPUS=n |
1804 | |
1805 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
1806 | |
1807 | numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. |
1808 | one of ['zone', 'node', 'default'] can be specified |
1809 | This can be set from sysctl after boot. |
1810 | See Documentation/sysctl/vm.txt for details. |
1811 | |
1812 | ohci1394_dma=early [HW] enable debugging via the ohci1394 driver. |
1813 | See Documentation/debugging-via-ohci1394.txt for more |
1814 | info. |
1815 | |
1816 | olpc_ec_timeout= [OLPC] ms delay when issuing EC commands |
1817 | Rather than timing out after 20 ms if an EC |
1818 | command is not properly ACKed, override the length |
1819 | of the timeout. We have interrupts disabled while |
1820 | waiting for the ACK, so if this is set too high |
1821 | interrupts *may* be lost! |
1822 | |
1823 | omap_mux= [OMAP] Override bootloader pin multiplexing. |
1824 | Format: <mux_mode0.mode_name=value>... |
1825 | For example, to override I2C bus2: |
1826 | omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100 |
1827 | |
1828 | oprofile.timer= [HW] |
1829 | Use timer interrupt instead of performance counters |
1830 | |
1831 | oprofile.cpu_type= Force an oprofile cpu type |
1832 | This might be useful if you have an older oprofile |
1833 | userland or if you want common events. |
1834 | Format: { arch_perfmon } |
1835 | arch_perfmon: [X86] Force use of architectural |
1836 | perfmon on Intel CPUs instead of the |
1837 | CPU specific event set. |
1838 | |
1839 | oops=panic Always panic on oopses. Default is to just kill the |
1840 | process, but there is a small probability of |
1841 | deadlocking the machine. |
1842 | This will also cause panics on machine check exceptions. |
1843 | Useful together with panic=30 to trigger a reboot. |
1844 | |
1845 | OSS [HW,OSS] |
1846 | See Documentation/sound/oss/oss-parameters.txt |
1847 | |
1848 | panic= [KNL] Kernel behaviour on panic: delay <timeout> |
1849 | seconds before rebooting |
1850 | Format: <timeout> |
1851 | |
1852 | parkbd.port= [HW] Parallel port number the keyboard adapter is |
1853 | connected to, default is 0. |
1854 | Format: <parport#> |
1855 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, |
1856 | 0 for XT, 1 for AT (default is AT). |
1857 | Format: <mode> |
1858 | |
1859 | parport= [HW,PPT] Specify parallel ports. 0 disables. |
1860 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } |
1861 | Use 'auto' to force the driver to use any |
1862 | IRQ/DMA settings detected (the default is to |
1863 | ignore detected IRQ/DMA settings because of |
1864 | possible conflicts). You can specify the base |
1865 | address, IRQ, and DMA settings; IRQ and DMA |
1866 | should be numbers, or 'auto' (for using detected |
1867 | settings on that particular port), or 'nofifo' |
1868 | (to avoid using a FIFO even if it is detected). |
1869 | Parallel ports are assigned in the order they |
1870 | are specified on the command line, starting |
1871 | with parport0. |
1872 | |
1873 | parport_init_mode= [HW,PPT] |
1874 | Configure VIA parallel port to operate in |
1875 | a specific mode. This is necessary on Pegasos |
1876 | computer where firmware has no options for setting |
1877 | up parallel port mode and sets it to spp. |
1878 | Currently this function knows 686a and 8231 chips. |
1879 | Format: [spp|ps2|epp|ecp|ecpepp] |
1880 | |
1881 | pause_on_oops= |
1882 | Halt all CPUs after the first oops has been printed for |
1883 | the specified number of seconds. This is to be used if |
1884 | your oopses keep scrolling off the screen. |
1885 | |
1886 | pcbit= [HW,ISDN] |
1887 | |
1888 | pcd. [PARIDE] |
1889 | See header of drivers/block/paride/pcd.c. |
1890 | See also Documentation/blockdev/paride.txt. |
1891 | |
1892 | pci=option[,option...] [PCI] various PCI subsystem options: |
1893 | earlydump [X86] dump PCI config space before the kernel |
1894 | changes anything |
1895 | off [X86] don't probe for the PCI bus |
1896 | bios [X86-32] force use of PCI BIOS, don't access |
1897 | the hardware directly. Use this if your machine |
1898 | has a non-standard PCI host bridge. |
1899 | nobios [X86-32] disallow use of PCI BIOS, only direct |
1900 | hardware access methods are allowed. Use this |
1901 | if you experience crashes upon bootup and you |
1902 | suspect they are caused by the BIOS. |
1903 | conf1 [X86] Force use of PCI Configuration |
1904 | Mechanism 1. |
1905 | conf2 [X86] Force use of PCI Configuration |
1906 | Mechanism 2. |
1907 | noaer [PCIE] If the PCIEAER kernel config parameter is |
1908 | enabled, this kernel boot option can be used to |
1909 | disable the use of PCIE advanced error reporting. |
1910 | nodomains [PCI] Disable support for multiple PCI |
1911 | root domains (aka PCI segments, in ACPI-speak). |
1912 | nommconf [X86] Disable use of MMCONFIG for PCI |
1913 | Configuration |
1914 | check_enable_amd_mmconf [X86] check for and enable |
1915 | properly configured MMIO access to PCI |
1916 | config space on AMD family 10h CPU |
1917 | nomsi [MSI] If the PCI_MSI kernel config parameter is |
1918 | enabled, this kernel boot option can be used to |
1919 | disable the use of MSI interrupts system-wide. |
1920 | noioapicquirk [APIC] Disable all boot interrupt quirks. |
1921 | Safety option to keep boot IRQs enabled. This |
1922 | should never be necessary. |
1923 | ioapicreroute [APIC] Enable rerouting of boot IRQs to the |
1924 | primary IO-APIC for bridges that cannot disable |
1925 | boot IRQs. This fixes a source of spurious IRQs |
1926 | when the system masks IRQs. |
1927 | noioapicreroute [APIC] Disable workaround that uses the |
1928 | boot IRQ equivalent of an IRQ that connects to |
1929 | a chipset where boot IRQs cannot be disabled. |
1930 | The opposite of ioapicreroute. |
1931 | biosirq [X86-32] Use PCI BIOS calls to get the interrupt |
1932 | routing table. These calls are known to be buggy |
1933 | on several machines and they hang the machine |
1934 | when used, but on other computers it's the only |
1935 | way to get the interrupt routing table. Try |
1936 | this option if the kernel is unable to allocate |
1937 | IRQs or discover secondary PCI buses on your |
1938 | motherboard. |
1939 | rom [X86] Assign address space to expansion ROMs. |
1940 | Use with caution as certain devices share |
1941 | address decoders between ROMs and other |
1942 | resources. |
1943 | norom [X86] Do not assign address space to |
1944 | expansion ROMs that do not already have |
1945 | BIOS assigned address ranges. |
1946 | nobar [X86] Do not assign address space to the |
1947 | BARs that weren't assigned by the BIOS. |
1948 | irqmask=0xMMMM [X86] Set a bit mask of IRQs allowed to be |
1949 | assigned automatically to PCI devices. You can |
1950 | make the kernel exclude IRQs of your ISA cards |
1951 | this way. |
1952 | pirqaddr=0xAAAAA [X86] Specify the physical address |
1953 | of the PIRQ table (normally generated |
1954 | by the BIOS) if it is outside the |
1955 | F0000h-100000h range. |
1956 | lastbus=N [X86] Scan all buses thru bus #N. Can be |
1957 | useful if the kernel is unable to find your |
1958 | secondary buses and you want to tell it |
1959 | explicitly which ones they are. |
1960 | assign-busses [X86] Always assign all PCI bus |
1961 | numbers ourselves, overriding |
1962 | whatever the firmware may have done. |
1963 | usepirqmask [X86] Honor the possible IRQ mask stored |
1964 | in the BIOS $PIR table. This is needed on |
1965 | some systems with broken BIOSes, notably |
1966 | some HP Pavilion N5400 and Omnibook XE3 |
1967 | notebooks. This will have no effect if ACPI |
1968 | IRQ routing is enabled. |
1969 | noacpi [X86] Do not use ACPI for IRQ routing |
1970 | or for PCI scanning. |
1971 | use_crs [X86] Use PCI host bridge window information |
1972 | from ACPI. On BIOSes from 2008 or later, this |
1973 | is enabled by default. If you need to use this, |
1974 | please report a bug. |
1975 | nocrs [X86] Ignore PCI host bridge windows from ACPI. |
1976 | If you need to use this, please report a bug. |
1977 | routeirq Do IRQ routing for all PCI devices. |
1978 | This is normally done in pci_enable_device(), |
1979 | so this option is a temporary workaround |
1980 | for broken drivers that don't call it. |
1981 | skip_isa_align [X86] do not align io start addr, so can |
1982 | handle more pci cards |
1983 | firmware [ARM] Do not re-enumerate the bus but instead |
1984 | just use the configuration from the |
1985 | bootloader. This is currently used on |
1986 | IXP2000 systems where the bus has to be |
1987 | configured a certain way for adjunct CPUs. |
1988 | noearly [X86] Don't do any early type 1 scanning. |
1989 | This might help on some broken boards which |
1990 | machine check when some devices' config space |
1991 | is read. But various workarounds are disabled |
1992 | and some IOMMU drivers will not work. |
1993 | bfsort Sort PCI devices into breadth-first order. |
1994 | This sorting is done to get a device |
1995 | order compatible with older (<= 2.4) kernels. |
1996 | nobfsort Don't sort PCI devices into breadth-first order. |
1997 | cbiosize=nn[KMG] The fixed amount of bus space which is |
1998 | reserved for the CardBus bridge's IO window. |
1999 | The default value is 256 bytes. |
2000 | cbmemsize=nn[KMG] The fixed amount of bus space which is |
2001 | reserved for the CardBus bridge's memory |
2002 | window. The default value is 64 megabytes. |
2003 | resource_alignment= |
2004 | Format: |
2005 | [<order of align>@][<domain>:]<bus>:<slot>.<func>[; ...] |
2006 | Specifies alignment and device to reassign |
2007 | aligned memory resources. |
2008 | If <order of align> is not specified, |
2009 | PAGE_SIZE is used as alignment. |
2010 | PCI-PCI bridge can be specified, if resource |
2011 | windows need to be expanded. |
2012 | ecrc= Enable/disable PCIe ECRC (transaction layer |
2013 | end-to-end CRC checking). |
2014 | bios: Use BIOS/firmware settings. This is the |
2015 | the default. |
2016 | off: Turn ECRC off |
2017 | on: Turn ECRC on. |
2018 | realloc reallocate PCI resources if allocations done by BIOS |
2019 | are erroneous. |
2020 | |
2021 | pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power |
2022 | Management. |
2023 | off Disable ASPM. |
2024 | force Enable ASPM even on devices that claim not to support it. |
2025 | WARNING: Forcing ASPM on may cause system lockups. |
2026 | |
2027 | pcie_ports= [PCIE] PCIe ports handling: |
2028 | auto Ask the BIOS whether or not to use native PCIe services |
2029 | associated with PCIe ports (PME, hot-plug, AER). Use |
2030 | them only if that is allowed by the BIOS. |
2031 | native Use native PCIe services associated with PCIe ports |
2032 | unconditionally. |
2033 | compat Treat PCIe ports as PCI-to-PCI bridges, disable the PCIe |
2034 | ports driver. |
2035 | |
2036 | pcie_pme= [PCIE,PM] Native PCIe PME signaling options: |
2037 | nomsi Do not use MSI for native PCIe PME signaling (this makes |
2038 | all PCIe root ports use INTx for all services). |
2039 | |
2040 | pcmv= [HW,PCMCIA] BadgePAD 4 |
2041 | |
2042 | pd. [PARIDE] |
2043 | See Documentation/blockdev/paride.txt. |
2044 | |
2045 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at |
2046 | boot time. |
2047 | Format: { 0 | 1 } |
2048 | See arch/parisc/kernel/pdc_chassis.c |
2049 | |
2050 | percpu_alloc= Select which percpu first chunk allocator to use. |
2051 | Currently supported values are "embed" and "page". |
2052 | Archs may support subset or none of the selections. |
2053 | See comments in mm/percpu.c for details on each |
2054 | allocator. This parameter is primarily for debugging |
2055 | and performance comparison. |
2056 | |
2057 | pf. [PARIDE] |
2058 | See Documentation/blockdev/paride.txt. |
2059 | |
2060 | pg. [PARIDE] |
2061 | See Documentation/blockdev/paride.txt. |
2062 | |
2063 | pirq= [SMP,APIC] Manual mp-table setup |
2064 | See Documentation/x86/i386/IO-APIC.txt. |
2065 | |
2066 | plip= [PPT,NET] Parallel port network link |
2067 | Format: { parport<nr> | timid | 0 } |
2068 | See also Documentation/parport.txt. |
2069 | |
2070 | pmtmr= [X86] Manual setup of pmtmr I/O Port. |
2071 | Override pmtimer IOPort with a hex value. |
2072 | e.g. pmtmr=0x508 |
2073 | |
2074 | pnp.debug [PNP] |
2075 | Enable PNP debug messages. This depends on the |
2076 | CONFIG_PNP_DEBUG_MESSAGES option. |
2077 | |
2078 | pnpacpi= [ACPI] |
2079 | { off } |
2080 | |
2081 | pnpbios= [ISAPNP] |
2082 | { on | off | curr | res | no-curr | no-res } |
2083 | |
2084 | pnp_reserve_irq= |
2085 | [ISAPNP] Exclude IRQs for the autoconfiguration |
2086 | |
2087 | pnp_reserve_dma= |
2088 | [ISAPNP] Exclude DMAs for the autoconfiguration |
2089 | |
2090 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
2091 | Ranges are in pairs (I/O port base and size). |
2092 | |
2093 | pnp_reserve_mem= |
2094 | [ISAPNP] Exclude memory regions for the |
2095 | autoconfiguration. |
2096 | Ranges are in pairs (memory base and size). |
2097 | |
2098 | ports= [IP_VS_FTP] IPVS ftp helper module |
2099 | Default is 21. |
2100 | Up to 8 (IP_VS_APP_MAX_PORTS) ports |
2101 | may be specified. |
2102 | Format: <port>,<port>.... |
2103 | |
2104 | print-fatal-signals= |
2105 | [KNL] debug: print fatal signals |
2106 | |
2107 | If enabled, warn about various signal handling |
2108 | related application anomalies: too many signals, |
2109 | too many POSIX.1 timers, fatal signals causing a |
2110 | coredump - etc. |
2111 | |
2112 | If you hit the warning due to signal overflow, |
2113 | you might want to try "ulimit -i unlimited". |
2114 | |
2115 | default: off. |
2116 | |
2117 | printk.time= Show timing data prefixed to each printk message line |
2118 | Format: <bool> (1/Y/y=enable, 0/N/n=disable) |
2119 | |
2120 | processor.max_cstate= [HW,ACPI] |
2121 | Limit processor to maximum C-state |
2122 | max_cstate=9 overrides any DMI blacklist limit. |
2123 | |
2124 | processor.nocst [HW,ACPI] |
2125 | Ignore the _CST method to determine C-states, |
2126 | instead using the legacy FADT method |
2127 | |
2128 | profile= [KNL] Enable kernel profiling via /proc/profile |
2129 | Format: [schedule,]<number> |
2130 | Param: "schedule" - profile schedule points. |
2131 | Param: <number> - step/bucket size as a power of 2 for |
2132 | statistical time based profiling. |
2133 | Param: "sleep" - profile D-state sleeping (millisecs). |
2134 | Requires CONFIG_SCHEDSTATS |
2135 | Param: "kvm" - profile VM exits. |
2136 | |
2137 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk |
2138 | before loading. |
2139 | See Documentation/blockdev/ramdisk.txt. |
2140 | |
2141 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to |
2142 | probe for; one of (bare|imps|exps|lifebook|any). |
2143 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports |
2144 | per second. |
2145 | psmouse.resetafter= [HW,MOUSE] |
2146 | Try to reset the device after so many bad packets |
2147 | (0 = never). |
2148 | psmouse.resolution= |
2149 | [HW,MOUSE] Set desired mouse resolution, in dpi. |
2150 | psmouse.smartscroll= |
2151 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. |
2152 | 0 = disabled, 1 = enabled (default). |
2153 | |
2154 | pt. [PARIDE] |
2155 | See Documentation/blockdev/paride.txt. |
2156 | |
2157 | pty.legacy_count= |
2158 | [KNL] Number of legacy pty's. Overwrites compiled-in |
2159 | default number. |
2160 | |
2161 | quiet [KNL] Disable most log messages |
2162 | |
2163 | r128= [HW,DRM] |
2164 | |
2165 | raid= [HW,RAID] |
2166 | See Documentation/md.txt. |
2167 | |
2168 | ramdisk_blocksize= [RAM] |
2169 | See Documentation/blockdev/ramdisk.txt. |
2170 | |
2171 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
2172 | See Documentation/blockdev/ramdisk.txt. |
2173 | |
2174 | rcupdate.blimit= [KNL,BOOT] |
2175 | Set maximum number of finished RCU callbacks to process |
2176 | in one batch. |
2177 | |
2178 | rcupdate.qhimark= [KNL,BOOT] |
2179 | Set threshold of queued |
2180 | RCU callbacks over which batch limiting is disabled. |
2181 | |
2182 | rcupdate.qlowmark= [KNL,BOOT] |
2183 | Set threshold of queued RCU callbacks below which |
2184 | batch limiting is re-enabled. |
2185 | |
2186 | rdinit= [KNL] |
2187 | Format: <full_path> |
2188 | Run specified binary instead of /init from the ramdisk, |
2189 | used for early userspace startup. See initrd. |
2190 | |
2191 | reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
2192 | Format: <reboot_mode>[,<reboot_mode2>[,...]] |
2193 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
2194 | |
2195 | relax_domain_level= |
2196 | [KNL, SMP] Set scheduler's default relax_domain_level. |
2197 | See Documentation/cgroups/cpusets.txt. |
2198 | |
2199 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
2200 | |
2201 | reservetop= [X86-32] |
2202 | Format: nn[KMG] |
2203 | Reserves a hole at the top of the kernel virtual |
2204 | address space. |
2205 | |
2206 | reservelow= [X86] |
2207 | Format: nn[K] |
2208 | Set the amount of memory to reserve for BIOS at |
2209 | the bottom of the address space. |
2210 | |
2211 | reset_devices [KNL] Force drivers to reset the underlying device |
2212 | during initialization. |
2213 | |
2214 | resume= [SWSUSP] |
2215 | Specify the partition device for software suspend |
2216 | |
2217 | resume_offset= [SWSUSP] |
2218 | Specify the offset from the beginning of the partition |
2219 | given by "resume=" at which the swap header is located, |
2220 | in <PAGE_SIZE> units (needed only for swap files). |
2221 | See Documentation/power/swsusp-and-swap-files.txt |
2222 | |
2223 | hibernate= [HIBERNATION] |
2224 | noresume Don't check if there's a hibernation image |
2225 | present during boot. |
2226 | nocompress Don't compress/decompress hibernation images. |
2227 | |
2228 | retain_initrd [RAM] Keep initrd memory after extraction |
2229 | |
2230 | rhash_entries= [KNL,NET] |
2231 | Set number of hash buckets for route cache |
2232 | |
2233 | riscom8= [HW,SERIAL] |
2234 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] |
2235 | |
2236 | ro [KNL] Mount root device read-only on boot |
2237 | |
2238 | root= [KNL] Root filesystem |
2239 | |
2240 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
2241 | mount the root filesystem |
2242 | |
2243 | rootflags= [KNL] Set root filesystem mount option string |
2244 | |
2245 | rootfstype= [KNL] Set root filesystem type |
2246 | |
2247 | rootwait [KNL] Wait (indefinitely) for root device to show up. |
2248 | Useful for devices that are detected asynchronously |
2249 | (e.g. USB and MMC devices). |
2250 | |
2251 | rw [KNL] Mount root device read-write on boot |
2252 | |
2253 | S [KNL] Run init in single mode |
2254 | |
2255 | sa1100ir [NET] |
2256 | See drivers/net/irda/sa1100_ir.c. |
2257 | |
2258 | sbni= [NET] Granch SBNI12 leased line adapter |
2259 | |
2260 | sched_debug [KNL] Enables verbose scheduler debug messages. |
2261 | |
2262 | security= [SECURITY] Choose a security module to enable at boot. |
2263 | If this boot parameter is not specified, only the first |
2264 | security module asking for security registration will be |
2265 | loaded. An invalid security module name will be treated |
2266 | as if no module has been chosen. |
2267 | |
2268 | selinux= [SELINUX] Disable or enable SELinux at boot time. |
2269 | Format: { "0" | "1" } |
2270 | See security/selinux/Kconfig help text. |
2271 | 0 -- disable. |
2272 | 1 -- enable. |
2273 | Default value is set via kernel config option. |
2274 | If enabled at boot time, /selinux/disable can be used |
2275 | later to disable prior to initial policy load. |
2276 | |
2277 | apparmor= [APPARMOR] Disable or enable AppArmor at boot time |
2278 | Format: { "0" | "1" } |
2279 | See security/apparmor/Kconfig help text |
2280 | 0 -- disable. |
2281 | 1 -- enable. |
2282 | Default value is set via kernel config option. |
2283 | |
2284 | serialnumber [BUGS=X86-32] |
2285 | |
2286 | shapers= [NET] |
2287 | Maximal number of shapers. |
2288 | |
2289 | show_msr= [x86] show boot-time MSR settings |
2290 | Format: { <integer> } |
2291 | Show boot-time (BIOS-initialized) MSR settings. |
2292 | The parameter means the number of CPUs to show, |
2293 | for example 1 means boot CPU only. |
2294 | |
2295 | simeth= [IA-64] |
2296 | simscsi= |
2297 | |
2298 | slram= [HW,MTD] |
2299 | |
2300 | slub_debug[=options[,slabs]] [MM, SLUB] |
2301 | Enabling slub_debug allows one to determine the |
2302 | culprit if slab objects become corrupted. Enabling |
2303 | slub_debug can create guard zones around objects and |
2304 | may poison objects when not in use. Also tracks the |
2305 | last alloc / free. For more information see |
2306 | Documentation/vm/slub.txt. |
2307 | |
2308 | slub_max_order= [MM, SLUB] |
2309 | Determines the maximum allowed order for slabs. |
2310 | A high setting may cause OOMs due to memory |
2311 | fragmentation. For more information see |
2312 | Documentation/vm/slub.txt. |
2313 | |
2314 | slub_min_objects= [MM, SLUB] |
2315 | The minimum number of objects per slab. SLUB will |
2316 | increase the slab order up to slub_max_order to |
2317 | generate a sufficiently large slab able to contain |
2318 | the number of objects indicated. The higher the number |
2319 | of objects the smaller the overhead of tracking slabs |
2320 | and the less frequently locks need to be acquired. |
2321 | For more information see Documentation/vm/slub.txt. |
2322 | |
2323 | slub_min_order= [MM, SLUB] |
2324 | Determines the mininum page order for slabs. Must be |
2325 | lower than slub_max_order. |
2326 | For more information see Documentation/vm/slub.txt. |
2327 | |
2328 | slub_nomerge [MM, SLUB] |
2329 | Disable merging of slabs with similar size. May be |
2330 | necessary if there is some reason to distinguish |
2331 | allocs to different slabs. Debug options disable |
2332 | merging on their own. |
2333 | For more information see Documentation/vm/slub.txt. |
2334 | |
2335 | smart2= [HW] |
2336 | Format: <io1>[,<io2>[,...,<io8>]] |
2337 | |
2338 | smp-alt-once [X86-32,SMP] On a hotplug CPU system, only |
2339 | attempt to substitute SMP alternatives once at boot. |
2340 | |
2341 | smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices |
2342 | smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port |
2343 | smsc-ircc2.ircc_sir= [HW] SIR base I/O port |
2344 | smsc-ircc2.ircc_fir= [HW] FIR base I/O port |
2345 | smsc-ircc2.ircc_irq= [HW] IRQ line |
2346 | smsc-ircc2.ircc_dma= [HW] DMA channel |
2347 | smsc-ircc2.ircc_transceiver= [HW] Transceiver type: |
2348 | 0: Toshiba Satellite 1800 (GP data pin select) |
2349 | 1: Fast pin select (default) |
2350 | 2: ATC IRMode |
2351 | |
2352 | softlockup_panic= |
2353 | [KNL] Should the soft-lockup detector generate panics. |
2354 | Format: <integer> |
2355 | |
2356 | sonypi.*= [HW] Sony Programmable I/O Control Device driver |
2357 | See Documentation/sonypi.txt |
2358 | |
2359 | specialix= [HW,SERIAL] Specialix multi-serial port adapter |
2360 | See Documentation/serial/specialix.txt. |
2361 | |
2362 | spia_io_base= [HW,MTD] |
2363 | spia_fio_base= |
2364 | spia_pedr= |
2365 | spia_peddr= |
2366 | |
2367 | stacktrace [FTRACE] |
2368 | Enabled the stack tracer on boot up. |
2369 | |
2370 | sti= [PARISC,HW] |
2371 | Format: <num> |
2372 | Set the STI (builtin display/keyboard on the HP-PARISC |
2373 | machines) console (graphic card) which should be used |
2374 | as the initial boot-console. |
2375 | See also comment in drivers/video/console/sticore.c. |
2376 | |
2377 | sti_font= [HW] |
2378 | See comment in drivers/video/console/sticore.c. |
2379 | |
2380 | stifb= [HW] |
2381 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
2382 | |
2383 | sunrpc.min_resvport= |
2384 | sunrpc.max_resvport= |
2385 | [NFS,SUNRPC] |
2386 | SunRPC servers often require that client requests |
2387 | originate from a privileged port (i.e. a port in the |
2388 | range 0 < portnr < 1024). |
2389 | An administrator who wishes to reserve some of these |
2390 | ports for other uses may adjust the range that the |
2391 | kernel's sunrpc client considers to be privileged |
2392 | using these two parameters to set the minimum and |
2393 | maximum port values. |
2394 | |
2395 | sunrpc.pool_mode= |
2396 | [NFS] |
2397 | Control how the NFS server code allocates CPUs to |
2398 | service thread pools. Depending on how many NICs |
2399 | you have and where their interrupts are bound, this |
2400 | option will affect which CPUs will do NFS serving. |
2401 | Note: this parameter cannot be changed while the |
2402 | NFS server is running. |
2403 | |
2404 | auto the server chooses an appropriate mode |
2405 | automatically using heuristics |
2406 | global a single global pool contains all CPUs |
2407 | percpu one pool for each CPU |
2408 | pernode one pool for each NUMA node (equivalent |
2409 | to global on non-NUMA machines) |
2410 | |
2411 | sunrpc.tcp_slot_table_entries= |
2412 | sunrpc.udp_slot_table_entries= |
2413 | [NFS,SUNRPC] |
2414 | Sets the upper limit on the number of simultaneous |
2415 | RPC calls that can be sent from the client to a |
2416 | server. Increasing these values may allow you to |
2417 | improve throughput, but will also increase the |
2418 | amount of memory reserved for use by the client. |
2419 | |
2420 | swapaccount[=0|1] |
2421 | [KNL] Enable accounting of swap in memory resource |
2422 | controller if no parameter or 1 is given or disable |
2423 | it if 0 is given (See Documentation/cgroups/memory.txt) |
2424 | |
2425 | swiotlb= [IA-64] Number of I/O TLB slabs |
2426 | |
2427 | switches= [HW,M68k] |
2428 | |
2429 | sysfs.deprecated=0|1 [KNL] |
2430 | Enable/disable old style sysfs layout for old udev |
2431 | on older distributions. When this option is enabled |
2432 | very new udev will not work anymore. When this option |
2433 | is disabled (or CONFIG_SYSFS_DEPRECATED not compiled) |
2434 | in older udev will not work anymore. |
2435 | Default depends on CONFIG_SYSFS_DEPRECATED_V2 set in |
2436 | the kernel configuration. |
2437 | |
2438 | sysrq_always_enabled |
2439 | [KNL] |
2440 | Ignore sysrq setting - this boot parameter will |
2441 | neutralize any effect of /proc/sys/kernel/sysrq. |
2442 | Useful for debugging. |
2443 | |
2444 | tdfx= [HW,DRM] |
2445 | |
2446 | test_suspend= [SUSPEND] |
2447 | Specify "mem" (for Suspend-to-RAM) or "standby" (for |
2448 | standby suspend) as the system sleep state to briefly |
2449 | enter during system startup. The system is woken from |
2450 | this state using a wakeup-capable RTC alarm. |
2451 | |
2452 | thash_entries= [KNL,NET] |
2453 | Set number of hash buckets for TCP connection |
2454 | |
2455 | thermal.act= [HW,ACPI] |
2456 | -1: disable all active trip points in all thermal zones |
2457 | <degrees C>: override all lowest active trip points |
2458 | |
2459 | thermal.crt= [HW,ACPI] |
2460 | -1: disable all critical trip points in all thermal zones |
2461 | <degrees C>: override all critical trip points |
2462 | |
2463 | thermal.nocrt= [HW,ACPI] |
2464 | Set to disable actions on ACPI thermal zone |
2465 | critical and hot trip points. |
2466 | |
2467 | thermal.off= [HW,ACPI] |
2468 | 1: disable ACPI thermal control |
2469 | |
2470 | thermal.psv= [HW,ACPI] |
2471 | -1: disable all passive trip points |
2472 | <degrees C>: override all passive trip points to this |
2473 | value |
2474 | |
2475 | thermal.tzp= [HW,ACPI] |
2476 | Specify global default ACPI thermal zone polling rate |
2477 | <deci-seconds>: poll all this frequency |
2478 | 0: no polling (default) |
2479 | |
2480 | threadirqs [KNL] |
2481 | Force threading of all interrupt handlers except those |
2482 | marked explicitely IRQF_NO_THREAD. |
2483 | |
2484 | topology= [S390] |
2485 | Format: {off | on} |
2486 | Specify if the kernel should make use of the cpu |
2487 | topology information if the hardware supports this. |
2488 | The scheduler will make use of this information and |
2489 | e.g. base its process migration decisions on it. |
2490 | Default is on. |
2491 | |
2492 | tp720= [HW,PS2] |
2493 | |
2494 | tpm_suspend_pcr=[HW,TPM] |
2495 | Format: integer pcr id |
2496 | Specify that at suspend time, the tpm driver |
2497 | should extend the specified pcr with zeros, |
2498 | as a workaround for some chips which fail to |
2499 | flush the last written pcr on TPM_SaveState. |
2500 | This will guarantee that all the other pcrs |
2501 | are saved. |
2502 | |
2503 | trace_buf_size=nn[KMG] |
2504 | [FTRACE] will set tracing buffer size. |
2505 | |
2506 | trace_event=[event-list] |
2507 | [FTRACE] Set and start specified trace events in order |
2508 | to facilitate early boot debugging. |
2509 | See also Documentation/trace/events.txt |
2510 | |
2511 | tsc= Disable clocksource stability checks for TSC. |
2512 | Format: <string> |
2513 | [x86] reliable: mark tsc clocksource as reliable, this |
2514 | disables clocksource verification at runtime, as well |
2515 | as the stability checks done at bootup. Used to enable |
2516 | high-resolution timer mode on older hardware, and in |
2517 | virtualized environment. |
2518 | [x86] noirqtime: Do not use TSC to do irq accounting. |
2519 | Used to run time disable IRQ_TIME_ACCOUNTING on any |
2520 | platforms where RDTSC is slow and this accounting |
2521 | can add overhead. |
2522 | |
2523 | turbografx.map[2|3]= [HW,JOY] |
2524 | TurboGraFX parallel port interface |
2525 | Format: |
2526 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
2527 | See also Documentation/input/joystick-parport.txt |
2528 | |
2529 | uhash_entries= [KNL,NET] |
2530 | Set number of hash buckets for UDP/UDP-Lite connections |
2531 | |
2532 | uhci-hcd.ignore_oc= |
2533 | [USB] Ignore overcurrent events (default N). |
2534 | Some badly-designed motherboards generate lots of |
2535 | bogus events, for ports that aren't wired to |
2536 | anything. Set this parameter to avoid log spamming. |
2537 | Note that genuine overcurrent events won't be |
2538 | reported either. |
2539 | |
2540 | unknown_nmi_panic |
2541 | [X86] Cause panic on unknown NMI. |
2542 | |
2543 | usbcore.autosuspend= |
2544 | [USB] The autosuspend time delay (in seconds) used |
2545 | for newly-detected USB devices (default 2). This |
2546 | is the time required before an idle device will be |
2547 | autosuspended. Devices for which the delay is set |
2548 | to a negative value won't be autosuspended at all. |
2549 | |
2550 | usbcore.usbfs_snoop= |
2551 | [USB] Set to log all usbfs traffic (default 0 = off). |
2552 | |
2553 | usbcore.blinkenlights= |
2554 | [USB] Set to cycle leds on hubs (default 0 = off). |
2555 | |
2556 | usbcore.old_scheme_first= |
2557 | [USB] Start with the old device initialization |
2558 | scheme (default 0 = off). |
2559 | |
2560 | usbcore.use_both_schemes= |
2561 | [USB] Try the other device initialization scheme |
2562 | if the first one fails (default 1 = enabled). |
2563 | |
2564 | usbcore.initial_descriptor_timeout= |
2565 | [USB] Specifies timeout for the initial 64-byte |
2566 | USB_REQ_GET_DESCRIPTOR request in milliseconds |
2567 | (default 5000 = 5.0 seconds). |
2568 | |
2569 | usbhid.mousepoll= |
2570 | [USBHID] The interval which mice are to be polled at. |
2571 | |
2572 | usb-storage.delay_use= |
2573 | [UMS] The delay in seconds before a new device is |
2574 | scanned for Logical Units (default 5). |
2575 | |
2576 | usb-storage.quirks= |
2577 | [UMS] A list of quirks entries to supplement or |
2578 | override the built-in unusual_devs list. List |
2579 | entries are separated by commas. Each entry has |
2580 | the form VID:PID:Flags where VID and PID are Vendor |
2581 | and Product ID values (4-digit hex numbers) and |
2582 | Flags is a set of characters, each corresponding |
2583 | to a common usb-storage quirk flag as follows: |
2584 | a = SANE_SENSE (collect more than 18 bytes |
2585 | of sense data); |
2586 | b = BAD_SENSE (don't collect more than 18 |
2587 | bytes of sense data); |
2588 | c = FIX_CAPACITY (decrease the reported |
2589 | device capacity by one sector); |
2590 | d = NO_READ_DISC_INFO (don't use |
2591 | READ_DISC_INFO command); |
2592 | e = NO_READ_CAPACITY_16 (don't use |
2593 | READ_CAPACITY_16 command); |
2594 | h = CAPACITY_HEURISTICS (decrease the |
2595 | reported device capacity by one |
2596 | sector if the number is odd); |
2597 | i = IGNORE_DEVICE (don't bind to this |
2598 | device); |
2599 | l = NOT_LOCKABLE (don't try to lock and |
2600 | unlock ejectable media); |
2601 | m = MAX_SECTORS_64 (don't transfer more |
2602 | than 64 sectors = 32 KB at a time); |
2603 | n = INITIAL_READ10 (force a retry of the |
2604 | initial READ(10) command); |
2605 | o = CAPACITY_OK (accept the capacity |
2606 | reported by the device); |
2607 | r = IGNORE_RESIDUE (the device reports |
2608 | bogus residue values); |
2609 | s = SINGLE_LUN (the device has only one |
2610 | Logical Unit); |
2611 | w = NO_WP_DETECT (don't test whether the |
2612 | medium is write-protected). |
2613 | Example: quirks=0419:aaf5:rl,0421:0433:rc |
2614 | |
2615 | userpte= |
2616 | [X86] Flags controlling user PTE allocations. |
2617 | |
2618 | nohigh = do not allocate PTE pages in |
2619 | HIGHMEM regardless of setting |
2620 | of CONFIG_HIGHPTE. |
2621 | |
2622 | vdso= [X86,SH] |
2623 | vdso=2: enable compat VDSO (default with COMPAT_VDSO) |
2624 | vdso=1: enable VDSO (default) |
2625 | vdso=0: disable VDSO mapping |
2626 | |
2627 | vdso32= [X86] |
2628 | vdso32=2: enable compat VDSO (default with COMPAT_VDSO) |
2629 | vdso32=1: enable 32-bit VDSO (default) |
2630 | vdso32=0: disable 32-bit VDSO mapping |
2631 | |
2632 | vector= [IA-64,SMP] |
2633 | vector=percpu: enable percpu vector domain |
2634 | |
2635 | video= [FB] Frame buffer configuration |
2636 | See Documentation/fb/modedb.txt. |
2637 | |
2638 | vga= [BOOT,X86-32] Select a particular video mode |
2639 | See Documentation/x86/boot.txt and |
2640 | Documentation/svga.txt. |
2641 | Use vga=ask for menu. |
2642 | This is actually a boot loader parameter; the value is |
2643 | passed to the kernel using a special protocol. |
2644 | |
2645 | vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
2646 | size of <nn>. This can be used to increase the |
2647 | minimum size (128MB on x86). It can also be used to |
2648 | decrease the size and leave more room for directly |
2649 | mapped kernel RAM. |
2650 | |
2651 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. |
2652 | Format: <command> |
2653 | |
2654 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. |
2655 | Format: <command> |
2656 | |
2657 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. |
2658 | Format: <command> |
2659 | |
2660 | vt.cur_default= [VT] Default cursor shape. |
2661 | Format: 0xCCBBAA, where AA, BB, and CC are the same as |
2662 | the parameters of the <Esc>[?A;B;Cc escape sequence; |
2663 | see VGA-softcursor.txt. Default: 2 = underline. |
2664 | |
2665 | vt.default_blu= [VT] |
2666 | Format: <blue0>,<blue1>,<blue2>,...,<blue15> |
2667 | Change the default blue palette of the console. |
2668 | This is a 16-member array composed of values |
2669 | ranging from 0-255. |
2670 | |
2671 | vt.default_grn= [VT] |
2672 | Format: <green0>,<green1>,<green2>,...,<green15> |
2673 | Change the default green palette of the console. |
2674 | This is a 16-member array composed of values |
2675 | ranging from 0-255. |
2676 | |
2677 | vt.default_red= [VT] |
2678 | Format: <red0>,<red1>,<red2>,...,<red15> |
2679 | Change the default red palette of the console. |
2680 | This is a 16-member array composed of values |
2681 | ranging from 0-255. |
2682 | |
2683 | vt.default_utf8= |
2684 | [VT] |
2685 | Format=<0|1> |
2686 | Set system-wide default UTF-8 mode for all tty's. |
2687 | Default is 1, i.e. UTF-8 mode is enabled for all |
2688 | newly opened terminals. |
2689 | |
2690 | vt.global_cursor_default= |
2691 | [VT] |
2692 | Format=<-1|0|1> |
2693 | Set system-wide default for whether a cursor |
2694 | is shown on new VTs. Default is -1, |
2695 | i.e. cursors will be created by default unless |
2696 | overridden by individual drivers. 0 will hide |
2697 | cursors, 1 will display them. |
2698 | |
2699 | watchdog timers [HW,WDT] For information on watchdog timers, |
2700 | see Documentation/watchdog/watchdog-parameters.txt |
2701 | or other driver-specific files in the |
2702 | Documentation/watchdog/ directory. |
2703 | |
2704 | x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of |
2705 | default x2apic cluster mode on platforms |
2706 | supporting x2apic. |
2707 | |
2708 | x86_mrst_timer= [X86-32,APBT] |
2709 | Choose timer option for x86 Moorestown MID platform. |
2710 | Two valid options are apbt timer only and lapic timer |
2711 | plus one apbt timer for broadcast timer. |
2712 | x86_mrst_timer=apbt_only | lapic_and_apbt |
2713 | |
2714 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. |
2715 | xd_geo= See header of drivers/block/xd.c. |
2716 | |
2717 | xen_emul_unplug= [HW,X86,XEN] |
2718 | Unplug Xen emulated devices |
2719 | Format: [unplug0,][unplug1] |
2720 | ide-disks -- unplug primary master IDE devices |
2721 | aux-ide-disks -- unplug non-primary-master IDE devices |
2722 | nics -- unplug network devices |
2723 | all -- unplug all emulated devices (NICs and IDE disks) |
2724 | unnecessary -- unplugging emulated devices is |
2725 | unnecessary even if the host did not respond to |
2726 | the unplug protocol |
2727 | never -- do not unplug even if version check succeeds |
2728 | |
2729 | xirc2ps_cs= [NET,PCMCIA] |
2730 | Format: |
2731 | <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
2732 | |
2733 | ______________________________________________________________________ |
2734 | |
2735 | TODO: |
2736 | |
2737 | Add more DRM drivers. |
2738 |
Branches:
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Tags:
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od-2011-09-18
v2.6.34-rc5
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