Stefan Richter | 0ee9d71 | 2006-04-01 01:42:29 +0200 | [diff] [blame] | 1 | Kernel Parameters |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Stefan Richter | a901ebb | 2006-04-01 01:43:18 +0200 | [diff] [blame] | 20 | This document may not be entirely up to date and comprehensive. The command |
| 21 | "modinfo -p ${modulename}" shows a current list of all parameters of a loadable |
| 22 | module. Loadable modules, after being loaded into the running kernel, also |
| 23 | reveal their parameters in /sys/module/${modulename}/parameters/. Some of these |
| 24 | parameters may be changed at runtime by the command |
| 25 | "echo -n ${value} > /sys/module/${modulename}/parameters/${parm}". |
| 26 | |
Stefan Richter | 6585fa8 | 2006-04-01 01:44:30 +0200 | [diff] [blame] | 27 | The parameters listed below are only valid if certain kernel build options were |
| 28 | enabled and if respective hardware is present. The text in square brackets at |
| 29 | the beginning of each description states the restrictions within which a |
| 30 | parameter is applicable: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | ACPI ACPI support is enabled. |
| 33 | ALSA ALSA sound support is enabled. |
| 34 | APIC APIC support is enabled. |
| 35 | APM Advanced Power Management support is enabled. |
| 36 | AX25 Appropriate AX.25 support is enabled. |
| 37 | CD Appropriate CD support is enabled. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 38 | DRM Direct Rendering Management support is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | EDD BIOS Enhanced Disk Drive Services (EDD) is enabled |
| 40 | EFI EFI Partitioning (GPT) is enabled |
| 41 | EIDE EIDE/ATAPI support is enabled. |
| 42 | FB The frame buffer device is enabled. |
| 43 | HW Appropriate hardware is enabled. |
| 44 | IA-32 IA-32 aka i386 architecture is enabled. |
| 45 | IA-64 IA-64 architecture is enabled. |
| 46 | IOSCHED More than one I/O scheduler is enabled. |
Adrian Bunk | 41e2e8b | 2005-07-12 13:58:33 -0700 | [diff] [blame] | 47 | IP_PNP IP DHCP, BOOTP, or RARP is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | ISAPNP ISA PnP code is enabled. |
| 49 | ISDN Appropriate ISDN support is enabled. |
| 50 | JOY Appropriate joystick support is enabled. |
| 51 | LP Printer support is enabled. |
| 52 | LOOP Loopback device support is enabled. |
| 53 | M68k M68k architecture is enabled. |
| 54 | These options have more detailed description inside of |
| 55 | Documentation/m68k/kernel-options.txt. |
| 56 | MCA MCA bus support is enabled. |
| 57 | MDA MDA console support is enabled. |
| 58 | MOUSE Appropriate mouse support is enabled. |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 59 | MSI Message Signaled Interrupts (PCI). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | MTD MTD support is enabled. |
| 61 | NET Appropriate network support is enabled. |
| 62 | NUMA NUMA support is enabled. |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 63 | GENERIC_TIME The generic timeofday code is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | NFS Appropriate NFS support is enabled. |
| 65 | OSS OSS sound support is enabled. |
| 66 | PARIDE The ParIDE subsystem is enabled. |
| 67 | PARISC The PA-RISC architecture is enabled. |
| 68 | PCI PCI bus support is enabled. |
| 69 | PCMCIA The PCMCIA subsystem is enabled. |
| 70 | PNP Plug & Play support is enabled. |
| 71 | PPC PowerPC architecture is enabled. |
| 72 | PPT Parallel port support is enabled. |
| 73 | PS2 Appropriate PS/2 support is enabled. |
| 74 | RAM RAM disk support is enabled. |
| 75 | S390 S390 architecture is enabled. |
| 76 | SCSI Appropriate SCSI support is enabled. |
| 77 | A lot of drivers has their options described inside of |
| 78 | Documentation/scsi/. |
| 79 | SELINUX SELinux support is enabled. |
| 80 | SERIAL Serial support is enabled. |
| 81 | SMP The kernel is an SMP kernel. |
| 82 | SPARC Sparc architecture is enabled. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 83 | SWSUSP Software suspend is enabled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | TS Appropriate touchscreen support is enabled. |
| 85 | USB USB support is enabled. |
| 86 | USBHID USB Human Interface Device support is enabled. |
| 87 | V4L Video For Linux support is enabled. |
| 88 | VGA The VGA console has been enabled. |
| 89 | VT Virtual terminal support is enabled. |
| 90 | WDT Watchdog support is enabled. |
| 91 | XT IBM PC/XT MFM hard disk support is enabled. |
| 92 | X86-64 X86-64 architecture is enabled. |
| 93 | More X86-64 boot options can be found in |
| 94 | Documentation/x86_64/boot-options.txt . |
| 95 | |
| 96 | In addition, the following text indicates that the option: |
| 97 | |
| 98 | BUGS= Relates to possible processor bugs on the said processor. |
| 99 | KNL Is a kernel start-up parameter. |
| 100 | BOOT Is a boot loader parameter. |
| 101 | |
| 102 | Parameters denoted with BOOT are actually interpreted by the boot |
| 103 | loader, and have no meaning to the kernel directly. |
| 104 | Do not modify the syntax of boot loader parameters without extreme |
| 105 | need or coordination with <Documentation/i386/boot.txt>. |
| 106 | |
| 107 | Note that ALL kernel parameters listed below are CASE SENSITIVE, and that |
| 108 | a trailing = on the name of any parameter states that that parameter will |
| 109 | be entered as an environment variable, whereas its absence indicates that |
| 110 | it will appear as a kernel argument readable via /proc/cmdline by programs |
| 111 | running once the system is up. |
| 112 | |
jens m. noedler | 9c4751f | 2006-09-29 02:00:27 -0700 | [diff] [blame] | 113 | The number of kernel parameters is not limited, but the length of the |
| 114 | complete command line (parameters including spaces etc.) is limited to |
| 115 | a fixed number of characters. This limit depends on the architecture |
| 116 | and is between 256 and 4096 characters. It is defined in the file |
| 117 | ./include/asm/setup.h as COMMAND_LINE_SIZE. |
| 118 | |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | 53c7xx= [HW,SCSI] Amiga SCSI controllers |
| 121 | See header of drivers/scsi/53c7xx.c. |
| 122 | See also Documentation/scsi/ncr53c7xx.txt. |
| 123 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 124 | acpi= [HW,ACPI] Advanced Configuration and Power Interface |
| 125 | Format: { force | off | ht | strict | noirq } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | force -- enable ACPI if default was off |
| 127 | off -- disable ACPI if default was on |
| 128 | noirq -- do not use ACPI for IRQ routing |
| 129 | ht -- run only enough ACPI to enable Hyper Threading |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 130 | strict -- Be less tolerant of platforms that are not |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | strictly ACPI specification compliant. |
| 132 | |
| 133 | See also Documentation/pm.txt, pci=noacpi |
| 134 | |
| 135 | acpi_sleep= [HW,ACPI] Sleep options |
| 136 | Format: { s3_bios, s3_mode } |
| 137 | See Documentation/power/video.txt |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 140 | Format: { level | edge | high | low } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 142 | acpi_irq_balance [HW,ACPI] |
| 143 | ACPI will balance active IRQs |
| 144 | default in APIC mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 146 | acpi_irq_nobalance [HW,ACPI] |
| 147 | ACPI will not move active IRQs (default) |
| 148 | default in PIC mode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 150 | acpi_irq_pci= [HW,ACPI] If irq_balance, clear listed IRQs for |
| 151 | use by PCI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | Format: <irq>,<irq>... |
| 153 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 154 | acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | Format: <irq>,<irq>... |
| 156 | |
Len Brown | a1f9e65 | 2006-01-25 23:47:36 -0500 | [diff] [blame] | 157 | acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS |
| 158 | Format: To spoof as Windows 98: ="Microsoft Windows" |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | acpi_osi= [HW,ACPI] empty param disables _OSI |
| 161 | |
| 162 | acpi_serialize [HW,ACPI] force serialization of AML methods |
| 163 | |
| 164 | acpi_skip_timer_override [HW,ACPI] |
| 165 | Recognize and ignore IRQ0/pin2 Interrupt Override. |
| 166 | For broken nForce2 BIOS resulting in XT-PIC timer. |
Andi Kleen | fa18f47 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 167 | acpi_use_timer_override [HW,ACPI} |
| 168 | Use timer override. For some broken Nvidia NF5 boards |
| 169 | that require a timer override, but don't have |
| 170 | HPET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | acpi_dbg_layer= [HW,ACPI] |
| 173 | Format: <int> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 174 | Each bit of the <int> indicates an ACPI debug layer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | 1: enable, 0: disable. It is useful for boot time |
| 176 | debugging. After system has booted up, it can be set |
| 177 | via /proc/acpi/debug_layer. |
| 178 | |
| 179 | acpi_dbg_level= [HW,ACPI] |
| 180 | Format: <int> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 181 | Each bit of the <int> indicates an ACPI debug level, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | 1: enable, 0: disable. It is useful for boot time |
| 183 | debugging. After system has booted up, it can be set |
| 184 | via /proc/acpi/debug_level. |
| 185 | |
| 186 | acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT |
| 187 | |
Luming Yu | 30e332f | 2005-08-12 00:31:00 -0400 | [diff] [blame] | 188 | acpi_generic_hotkey [HW,ACPI] |
| 189 | Allow consolidated generic hotkey driver to |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 190 | override platform specific driver. |
Luming Yu | 30e332f | 2005-08-12 00:31:00 -0400 | [diff] [blame] | 191 | See also Documentation/acpi-hotkey.txt. |
| 192 | |
john stultz | 5d0cf41 | 2006-06-26 00:25:12 -0700 | [diff] [blame] | 193 | acpi_pm_good [IA-32,X86-64] |
| 194 | Override the pmtimer bug detection: force the kernel |
| 195 | to assume that this machine's pmtimer latches its value |
| 196 | and always returns good values. |
| 197 | |
Chuck Ebbert | 66759a0 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 198 | enable_timer_pin_1 [i386,x86-64] |
| 199 | Enable PIN 1 of APIC timer |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 200 | Can be useful to work around chipset bugs |
| 201 | (in particular on some ATI chipsets). |
Chuck Ebbert | 66759a0 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 202 | The kernel tries to set a reasonable default. |
| 203 | |
| 204 | disable_timer_pin_1 [i386,x86-64] |
| 205 | Disable PIN 1 of APIC timer |
| 206 | Can be useful to work around chipset bugs. |
| 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | ad1816= [HW,OSS] |
| 209 | Format: <io>,<irq>,<dma>,<dma2> |
| 210 | See also Documentation/sound/oss/AD1816. |
| 211 | |
| 212 | ad1848= [HW,OSS] |
| 213 | Format: <io>,<irq>,<dma>,<dma2>,<type> |
| 214 | |
| 215 | adlib= [HW,OSS] |
| 216 | Format: <io> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | advansys= [HW,SCSI] |
| 219 | See header of drivers/scsi/advansys.c. |
| 220 | |
| 221 | advwdt= [HW,WDT] Advantech WDT |
| 222 | Format: <iostart>,<iostop> |
| 223 | |
| 224 | aedsp16= [HW,OSS] Audio Excel DSP 16 |
| 225 | Format: <io>,<irq>,<dma>,<mss_io>,<mpu_io>,<mpu_irq> |
| 226 | See also header of sound/oss/aedsp16.c. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | aha152x= [HW,SCSI] |
| 229 | See Documentation/scsi/aha152x.txt. |
| 230 | |
| 231 | aha1542= [HW,SCSI] |
| 232 | Format: <portbase>[,<buson>,<busoff>[,<dmaspeed>]] |
| 233 | |
| 234 | aic7xxx= [HW,SCSI] |
| 235 | See Documentation/scsi/aic7xxx.txt. |
| 236 | |
| 237 | aic79xx= [HW,SCSI] |
| 238 | See Documentation/scsi/aic79xx.txt. |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | amijoy.map= [HW,JOY] Amiga joystick support |
| 241 | Map of devices attached to JOY0DAT and JOY1DAT |
| 242 | Format: <a>,<b> |
| 243 | See also Documentation/kernel/input/joystick.txt |
| 244 | |
| 245 | analog.map= [HW,JOY] Analog joystick and gamepad support |
| 246 | Specifies type or capabilities of an analog joystick |
| 247 | connected to one of 16 gameports |
| 248 | Format: <type1>,<type2>,..<type16> |
| 249 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 250 | apc= [HW,SPARC] |
| 251 | Power management functions (SPARCstation-4/5 + deriv.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | Format: noidle |
| 253 | Disable APC CPU standby support. SPARCstation-Fox does |
| 254 | not play well with APC CPU idle - disable it if you have |
| 255 | APC and your system crashes randomly. |
| 256 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 257 | apic= [APIC,i386] Change the output verbosity whilst booting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | Format: { quiet (default) | verbose | debug } |
| 259 | Change the amount of debugging information output |
| 260 | when initialising the APIC and IO-APIC components. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | apm= [APM] Advanced Power Management |
| 263 | See header of arch/i386/kernel/apm.c. |
| 264 | |
| 265 | applicom= [HW] |
| 266 | Format: <mem>,<irq> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 267 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards |
| 269 | Format: <io>,<irq>,<nodeID> |
| 270 | |
| 271 | ataflop= [HW,M68k] |
| 272 | |
| 273 | atarimouse= [HW,MOUSE] Atari Mouse |
| 274 | |
| 275 | atascsi= [HW,SCSI] Atari SCSI |
| 276 | |
| 277 | atkbd.extra= [HW] Enable extra LEDs and keys on IBM RapidAccess, |
| 278 | EzKey and similar keyboards |
| 279 | |
| 280 | atkbd.reset= [HW] Reset keyboard during initialization |
| 281 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 282 | atkbd.set= [HW] Select keyboard code set |
| 283 | Format: <int> (2 = AT (default), 3 = PS/2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | atkbd.scroll= [HW] Enable scroll wheel on MS Office and similar |
| 286 | keyboards |
| 287 | |
| 288 | atkbd.softraw= [HW] Choose between synthetic and real raw mode |
| 289 | Format: <bool> (0 = real, 1 = synthetic (default)) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 290 | |
| 291 | atkbd.softrepeat= [HW] |
| 292 | Use software keyboard repeat |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
| 294 | autotest [IA64] |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | aztcd= [HW,CD] Aztech CD268 CDROM driver |
| 297 | Format: <io>,0x79 (?) |
| 298 | |
| 299 | baycom_epp= [HW,AX25] |
| 300 | Format: <io>,<mode> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem |
| 303 | Format: <io>,<mode> |
| 304 | See header of drivers/net/hamradio/baycom_par.c. |
| 305 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 306 | baycom_ser_fdx= [HW,AX25] |
| 307 | BayCom Serial Port AX.25 Modem (Full Duplex Mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | Format: <io>,<irq>,<mode>[,<baud>] |
| 309 | See header of drivers/net/hamradio/baycom_ser_fdx.c. |
| 310 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 311 | baycom_ser_hdx= [HW,AX25] |
| 312 | BayCom Serial Port AX.25 Modem (Half Duplex Mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | Format: <io>,<irq>,<mode> |
| 314 | See header of drivers/net/hamradio/baycom_ser_hdx.c. |
| 315 | |
| 316 | blkmtd_device= [HW,MTD] |
| 317 | blkmtd_erasesz= |
| 318 | blkmtd_ro= |
| 319 | blkmtd_bs= |
| 320 | blkmtd_count= |
| 321 | |
| 322 | bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 323 | bttv.radio= Most important insmod options are available as |
| 324 | kernel args too. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | bttv.pll= See Documentation/video4linux/bttv/Insmod-options |
| 326 | bttv.tuner= and Documentation/video4linux/bttv/CARDLIST |
| 327 | |
| 328 | BusLogic= [HW,SCSI] |
| 329 | See drivers/scsi/BusLogic.c, comment before function |
| 330 | BusLogic_ParseDriverOptions(). |
| 331 | |
| 332 | c101= [NET] Moxa C101 synchronous serial card |
| 333 | |
| 334 | cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection. |
| 335 | Sometimes CPU hardware bugs make them report the cache |
| 336 | size incorrectly. The kernel will attempt work arounds |
| 337 | to fix known problems, but for some CPUs it is not |
| 338 | possible to determine what the correct size should be. |
| 339 | This option provides an override for these situations. |
| 340 | |
| 341 | cdu31a= [HW,CD] |
| 342 | Format: <io>,<irq>[,PAS] |
| 343 | See header of drivers/cdrom/cdu31a.c. |
| 344 | |
| 345 | chandev= [HW,NET] Generic channel device initialisation |
| 346 | |
| 347 | checkreqprot [SELINUX] Set initial checkreqprot flag value. |
| 348 | Format: { "0" | "1" } |
| 349 | See security/selinux/Kconfig help text. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 350 | 0 -- check protection applied by kernel (includes |
| 351 | any implied execute protection). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | 1 -- check protection requested by application. |
| 353 | Default value is set via a kernel config option. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 354 | Value can be changed at runtime via |
| 355 | /selinux/checkreqprot. |
| 356 | |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 357 | clock= [BUGS=IA-32, HW] gettimeofday clocksource override. |
| 358 | [Deprecated] |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 359 | Forces specified clocksource (if available) to be used |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 360 | when calculating gettimeofday(). If specified |
Matt LaPlante | 3f6dee9 | 2006-10-03 22:45:33 +0200 | [diff] [blame] | 361 | clocksource is not available, it defaults to PIT. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | Format: { pit | tsc | cyclone | pmtmr } |
| 363 | |
Andi Kleen | f9262c1 | 2006-03-08 17:57:25 -0800 | [diff] [blame] | 364 | disable_8254_timer |
| 365 | enable_8254_timer |
| 366 | [IA32/X86_64] Disable/Enable interrupt 0 timer routing |
| 367 | over the 8254 in addition to over the IO-APIC. The |
| 368 | kernel tries to set a sensible default. |
| 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | hpet= [IA-32,HPET] option to disable HPET and use PIT. |
| 371 | Format: disable |
| 372 | |
| 373 | cm206= [HW,CD] |
| 374 | Format: { auto | [<io>,][<irq>] } |
| 375 | |
| 376 | com20020= [HW,NET] ARCnet - COM20020 chipset |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 377 | Format: |
| 378 | <io>[,<irq>[,<nodeID>[,<backplane>[,<ckp>[,<timeout>]]]]] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers) |
| 381 | Format: <io>[,<irq>] |
| 382 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 383 | com90xx= [HW,NET] |
| 384 | ARCnet - COM90xx chipset (memory-mapped buffers) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | Format: <io>[,<irq>[,<memstart>]] |
| 386 | |
| 387 | condev= [HW,S390] console device |
| 388 | conmode= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | console= [KNL] Output console device and options. |
| 391 | |
| 392 | tty<n> Use the virtual console device <n>. |
| 393 | |
| 394 | ttyS<n>[,options] |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 395 | ttyUSB0[,options] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | Use the specified serial port. The options are of |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 397 | the form "bbbbpnf", where "bbbb" is the baud rate, |
| 398 | "p" is parity ("n", "o", or "e"), "n" is number of |
| 399 | bits, and "f" is flow control ("r" for RTS or |
| 400 | omit it). Default is "9600n8". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Randy Dunlap | f1a1c2d | 2006-03-25 03:08:17 -0800 | [diff] [blame] | 402 | See Documentation/serial-console.txt for more |
| 403 | information. See |
| 404 | Documentation/networking/netconsole.txt for an |
| 405 | alternative. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | uart,io,<addr>[,options] |
| 408 | uart,mmio,<addr>[,options] |
| 409 | Start an early, polled-mode console on the 8250/16550 |
| 410 | UART at the specified I/O port or MMIO address, |
| 411 | switching to the matching ttyS device later. The |
| 412 | options are the same as for ttyS, above. |
| 413 | |
| 414 | cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 415 | Format: |
| 416 | <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | cpia_pp= [HW,PPT] |
| 419 | Format: { parport<nr> | auto | none } |
| 420 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 421 | crashkernel=nn[KMG]@ss[KMG] |
| 422 | [KNL] Reserve a chunk of physical memory to |
| 423 | hold a kernel to switch to with kexec on panic. |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | cs4232= [HW,OSS] |
| 426 | Format: <io>,<irq>,<dma>,<dma2>,<mpuio>,<mpuirq> |
| 427 | |
| 428 | cs89x0_dma= [HW,NET] |
| 429 | Format: <dma> |
| 430 | |
| 431 | cs89x0_media= [HW,NET] |
| 432 | Format: { rj45 | aui | bnc } |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | cyclades= [HW,SERIAL] Cyclades multi-serial port adapter. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 435 | |
| 436 | dasd= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | See header of drivers/s390/block/dasd_devmap.c. |
| 438 | |
| 439 | db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port |
| 440 | (one device per port) |
| 441 | Format: <port#>,<type> |
| 442 | See also Documentation/input/joystick-parport.txt |
| 443 | |
| 444 | debug [KNL] Enable kernel debugging (events log level). |
| 445 | |
Ingo Molnar | cae2ed9 | 2006-07-03 00:24:48 -0700 | [diff] [blame] | 446 | debug_locks_verbose= |
| 447 | [KNL] verbose self-tests |
| 448 | Format=<0|1> |
| 449 | Print debugging info while doing the locking API |
| 450 | self-tests. |
| 451 | We default to 0 (no extra messages), setting it to |
| 452 | 1 will print _a lot_ more information - normally |
| 453 | only useful to kernel developers. |
| 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | decnet= [HW,NET] |
| 456 | Format: <area>[,<node>] |
| 457 | See also Documentation/networking/decnet.txt. |
| 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | dhash_entries= [KNL] |
| 460 | Set number of hash buckets for dentry cache. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | digi= [HW,SERIAL] |
| 463 | IO parameters + enable/disable command. |
| 464 | |
| 465 | digiepca= [HW,SERIAL] |
| 466 | See drivers/char/README.epca and |
| 467 | Documentation/digiepca.txt. |
| 468 | |
| 469 | dmascc= [HW,AX25,SERIAL] AX.25 Z80SCC driver with DMA |
| 470 | support available. |
| 471 | Format: <io_dev0>[,<io_dev1>[,..<io_dev32>]] |
| 472 | |
| 473 | dmasound= [HW,OSS] Sound subsystem buffers |
| 474 | |
| 475 | dscc4.setup= [NET] |
| 476 | |
| 477 | dtc3181e= [HW,SCSI] |
| 478 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 479 | earlyprintk= [IA-32,X86-64] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | earlyprintk=vga |
| 481 | earlyprintk=serial[,ttySn[,baudrate]] |
| 482 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 483 | Append ",keep" to not disable it when the real console |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | takes over. |
| 485 | |
| 486 | Only vga or serial at a time, not both. |
| 487 | |
| 488 | Currently only ttyS0 and ttyS1 are supported. |
| 489 | |
| 490 | Interaction with the standard serial driver is not |
| 491 | very good. |
| 492 | |
| 493 | The VGA output is eventually overwritten by the real |
| 494 | console. |
| 495 | |
| 496 | eata= [HW,SCSI] |
| 497 | |
Len Brown | 53f11d4 | 2005-12-05 16:46:36 -0500 | [diff] [blame] | 498 | ec_intr= [HW,ACPI] ACPI Embedded Controller interrupt mode |
| 499 | Format: <int> |
| 500 | 0: polling mode |
| 501 | non-0: interrupt mode (default) |
| 502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | eda= [HW,PS2] |
| 504 | |
| 505 | edb= [HW,PS2] |
| 506 | |
| 507 | edd= [EDD] |
| 508 | Format: {"of[f]" | "sk[ipmbr]"} |
| 509 | See comment in arch/i386/boot/edd.S |
| 510 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 511 | eicon= [HW,ISDN] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | Format: <id>,<membase>,<irq> |
| 513 | |
| 514 | eisa_irq_edge= [PARISC,HW] |
| 515 | See header of drivers/parisc/eisa.c. |
| 516 | |
| 517 | elanfreq= [IA-32] |
| 518 | See comment before function elanfreq_setup() in |
| 519 | arch/i386/kernel/cpu/cpufreq/elanfreq.c. |
| 520 | |
| 521 | elevator= [IOSCHED] |
Randy Dunlap | 16ab3ad | 2006-01-14 13:21:20 -0800 | [diff] [blame] | 522 | Format: {"anticipatory" | "cfq" | "deadline" | "noop"} |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 523 | See Documentation/block/as-iosched.txt and |
| 524 | Documentation/block/deadline-iosched.txt for details. |
| 525 | |
Vivek Goyal | aac04b3 | 2006-01-09 20:51:47 -0800 | [diff] [blame] | 526 | elfcorehdr= [IA-32, X86_64] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 527 | Specifies physical address of start of kernel core |
Vivek Goyal | aac04b3 | 2006-01-09 20:51:47 -0800 | [diff] [blame] | 528 | image elf header. Generally kexec loader will |
| 529 | pass this option to capture kernel. |
| 530 | See Documentation/kdump/kdump.txt for details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
| 532 | enforcing [SELINUX] Set initial enforcing status. |
| 533 | Format: {"0" | "1"} |
| 534 | See security/selinux/Kconfig help text. |
| 535 | 0 -- permissive (log only, no denials). |
| 536 | 1 -- enforcing (deny and log). |
| 537 | Default value is 0. |
| 538 | Value can be changed at runtime via /selinux/enforce. |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | es1371= [HW,OSS] |
| 541 | Format: <spdif>,[<nomix>,[<amplifier>]] |
| 542 | See also header of sound/oss/es1371.c. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | ether= [HW,NET] Ethernet cards parameters |
| 545 | This option is obsoleted by the "netdev=" option, which |
| 546 | has equivalent usage. See its documentation for details. |
| 547 | |
| 548 | eurwdt= [HW,WDT] Eurotech CPU-1220/1410 onboard watchdog. |
| 549 | Format: <io>[,<irq>] |
| 550 | |
| 551 | fd_mcs= [HW,SCSI] |
| 552 | See header of drivers/scsi/fd_mcs.c. |
| 553 | |
| 554 | fdomain= [HW,SCSI] |
| 555 | See header of drivers/scsi/fdomain.c. |
| 556 | |
| 557 | floppy= [HW] |
| 558 | See Documentation/floppy.txt. |
| 559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | gamecon.map[2|3]= |
| 561 | [HW,JOY] Multisystem joystick and NES/SNES/PSX pad |
| 562 | support via parallel port (up to 5 devices per port) |
| 563 | Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5> |
| 564 | See also Documentation/input/joystick-parport.txt |
| 565 | |
| 566 | gamma= [HW,DRM] |
| 567 | |
| 568 | gdth= [HW,SCSI] |
| 569 | See header of drivers/scsi/gdth.c. |
| 570 | |
| 571 | gpt [EFI] Forces disk with valid GPT signature but |
| 572 | invalid Protective MBR to be treated as GPT. |
| 573 | |
| 574 | gscd= [HW,CD] |
| 575 | Format: <io> |
| 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | gvp11= [HW,SCSI] |
| 578 | |
| 579 | hashdist= [KNL,NUMA] Large hashes allocated during boot |
| 580 | are distributed across NUMA nodes. Defaults on |
| 581 | for IA-64, off otherwise. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 582 | Format: 0 | 1 (for off | on) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | hcl= [IA-64] SGI's Hardware Graph compatibility layer |
| 585 | |
| 586 | hd= [EIDE] (E)IDE hard drive subsystem geometry |
| 587 | Format: <cyl>,<head>,<sect> |
| 588 | |
| 589 | hd?= [HW] (E)IDE subsystem |
| 590 | hd?lun= See Documentation/ide.txt. |
| 591 | |
| 592 | highmem=nn[KMG] [KNL,BOOT] forces the highmem zone to have an exact |
| 593 | size of <nn>. This works even on boxes that have no |
| 594 | highmem otherwise. This also works to reduce highmem |
| 595 | size on bigger boxes. |
| 596 | |
| 597 | hisax= [HW,ISDN] |
| 598 | See Documentation/isdn/README.HiSax. |
| 599 | |
| 600 | hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages. |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | i8042.direct [HW] Put keyboard port into non-translated mode |
Matt LaPlante | 84eb8d0 | 2006-10-03 22:53:09 +0200 | [diff] [blame] | 603 | i8042.dumbkbd [HW] Pretend that controller can only read data from |
| 604 | keyboard and cannot control its state |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | (Don't attempt to blink the leds) |
| 606 | i8042.noaux [HW] Don't check for auxiliary (== mouse) port |
Dmitry Torokhov | 945ef0d | 2005-09-04 01:42:00 -0500 | [diff] [blame] | 607 | i8042.nokbd [HW] Don't check/create keyboard port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | i8042.nomux [HW] Don't check presence of an active multiplexing |
| 609 | controller |
| 610 | i8042.nopnp [HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX |
| 611 | controllers |
| 612 | i8042.panicblink= |
| 613 | [HW] Frequency with which keyboard LEDs should blink |
| 614 | when kernel panics (default is 0.5 sec) |
| 615 | i8042.reset [HW] Reset the controller during init and cleanup |
| 616 | i8042.unlock [HW] Unlock (ignore) the keylock |
| 617 | |
| 618 | i810= [HW,DRM] |
| 619 | |
Dmitry Torokhov | e70c9d5 | 2005-06-25 14:54:25 -0700 | [diff] [blame] | 620 | i8k.ignore_dmi [HW] Continue probing hardware even if DMI data |
| 621 | indicates that the driver is running on unsupported |
| 622 | hardware. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | i8k.force [HW] Activate i8k driver even if SMM BIOS signature |
| 624 | does not match list of supported models. |
| 625 | i8k.power_status |
| 626 | [HW] Report power status in /proc/i8k |
| 627 | (disabled by default) |
| 628 | i8k.restricted [HW] Allow controlling fans only if SYS_ADMIN |
| 629 | capability is set. |
| 630 | |
| 631 | ibmmcascsi= [HW,MCA,SCSI] IBM MicroChannel SCSI adapter |
| 632 | See Documentation/mca.txt. |
| 633 | |
| 634 | icn= [HW,ISDN] |
| 635 | Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]] |
| 636 | |
| 637 | ide= [HW] (E)IDE subsystem |
| 638 | Format: ide=nodma or ide=doubler or ide=reverse |
| 639 | See Documentation/ide.txt. |
| 640 | |
| 641 | ide?= [HW] (E)IDE subsystem |
| 642 | Format: ide?=noprobe or chipset specific parameters. |
| 643 | See Documentation/ide.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | idebus= [HW] (E)IDE subsystem - VLB/PCI bus speed |
| 646 | See Documentation/ide.txt. |
| 647 | |
| 648 | idle= [HW] |
| 649 | Format: idle=poll or idle=halt |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 650 | |
Ingo Molnar | 79290822 | 2006-12-06 20:40:51 -0800 | [diff] [blame] | 651 | ignore_loglevel [KNL] |
| 652 | Ignore loglevel setting - this will print /all/ |
| 653 | kernel messages to the console. Useful for debugging. |
| 654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | ihash_entries= [KNL] |
| 656 | Set number of hash buckets for inode cache. |
| 657 | |
| 658 | in2000= [HW,SCSI] |
| 659 | See header of drivers/scsi/in2000.c. |
| 660 | |
| 661 | init= [KNL] |
| 662 | Format: <full_path> |
| 663 | Run specified binary instead of /sbin/init as init |
| 664 | process. |
| 665 | |
| 666 | initcall_debug [KNL] Trace initcalls as they are executed. Useful |
| 667 | for working out where the kernel is dying during |
| 668 | startup. |
| 669 | |
| 670 | initrd= [BOOT] Specify the location of the initial ramdisk |
| 671 | |
| 672 | inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver |
| 673 | Format: <irq> |
| 674 | |
Jesse Barnes | 2bd0fa3 | 2005-12-13 03:05:03 -0500 | [diff] [blame] | 675 | combined_mode= [HW] control which driver uses IDE ports in combined |
| 676 | mode: legacy IDE driver, libata, or both |
| 677 | (in the libata case, libata.atapi_enabled=1 may be |
| 678 | useful as well). Note that using the ide or libata |
| 679 | options may affect your device naming (e.g. by |
| 680 | changing hdc to sdb). |
| 681 | Format: combined (default), ide, or libata |
| 682 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | inttest= [IA64] |
| 684 | |
| 685 | io7= [HW] IO7 for Marvel based alpha systems |
| 686 | See comment before marvel_specify_io7 in |
| 687 | arch/alpha/kernel/core_marvel.c. |
| 688 | |
| 689 | ip= [IP_PNP] |
| 690 | See Documentation/nfsroot.txt. |
| 691 | |
| 692 | ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards |
| 693 | See comment before ip2_setup() in drivers/char/ip2.c. |
| 694 | |
| 695 | ips= [HW,SCSI] Adaptec / IBM ServeRAID controller |
| 696 | See header of drivers/scsi/ips.c. |
| 697 | |
Simon Horman | 72c4a13 | 2006-09-13 19:57:18 -0700 | [diff] [blame] | 698 | ports= [IP_VS_FTP] IPVS ftp helper module |
| 699 | Default is 21. |
| 700 | Up to 8 (IP_VS_APP_MAX_PORTS) ports |
| 701 | may be specified. |
| 702 | Format: <port>,<port>.... |
| 703 | |
Alan Cox | 200803d | 2005-06-28 20:45:18 -0700 | [diff] [blame] | 704 | irqfixup [HW] |
| 705 | When an interrupt is not handled search all handlers |
| 706 | for it. Intended to get systems with badly broken |
| 707 | firmware running. |
| 708 | |
| 709 | irqpoll [HW] |
| 710 | When an interrupt is not handled search all handlers |
| 711 | for it. Also check all handlers each timer |
| 712 | interrupt. Intended to get systems with badly broken |
| 713 | firmware running. |
| 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | isapnp= [ISAPNP] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 716 | Format: <RDP>,<reset>,<pci_scan>,<verbosity> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
| 718 | isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler. |
Derek Fults | 22f2e28 | 2006-12-06 20:37:11 -0800 | [diff] [blame] | 719 | Format: |
| 720 | <cpu number>,...,<cpu number> |
| 721 | or |
| 722 | <cpu number>-<cpu number> (must be a positive range in ascending order) |
| 723 | or a mixture |
| 724 | <cpu number>,...,<cpu number>-<cpu number> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | This option can be used to specify one or more CPUs |
| 726 | to isolate from the general SMP balancing and scheduling |
| 727 | algorithms. The only way to move a process onto or off |
| 728 | an "isolated" CPU is via the CPU affinity syscalls. |
| 729 | <cpu number> begins at 0 and the maximum value is |
| 730 | "number of CPUs in system - 1". |
| 731 | |
| 732 | This option is the preferred way to isolate CPUs. The |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 733 | alternative -- manually setting the CPU mask of all |
| 734 | tasks in the system -- can cause problems and |
| 735 | suboptimal load balancer performance. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | |
| 737 | isp16= [HW,CD] |
| 738 | Format: <io>,<irq>,<dma>,<setup> |
| 739 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 740 | iucv= [HW,NET] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
| 742 | js= [HW,JOY] Analog joystick |
| 743 | See Documentation/input/joystick.txt. |
| 744 | |
| 745 | keepinitrd [HW,ARM] |
| 746 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 747 | kstack=N [IA-32,X86-64] Print N words from the kernel stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | in oops dumps. |
| 749 | |
| 750 | l2cr= [PPC] |
| 751 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 752 | lapic [IA-32,APIC] Enable the local APIC even if BIOS |
| 753 | disabled it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip |
| 756 | Format: addr:<io>,irq:<irq> |
| 757 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 758 | llsc*= [IA64] See function print_params() in |
| 759 | arch/ia64/sn/kernel/llsc4.c. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | load_ramdisk= [RAM] List of ramdisks to load from floppy |
| 762 | See Documentation/ramdisk.txt. |
| 763 | |
Randy Dunlap | a6b25b6 | 2006-01-14 13:21:19 -0800 | [diff] [blame] | 764 | lockd.nlm_grace_period=P [NFS] Assign grace period. |
| 765 | Format: <integer> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Randy Dunlap | a6b25b6 | 2006-01-14 13:21:19 -0800 | [diff] [blame] | 767 | lockd.nlm_tcpport=N [NFS] Assign TCP port. |
| 768 | Format: <integer> |
| 769 | |
| 770 | lockd.nlm_timeout=T [NFS] Assign timeout value. |
| 771 | Format: <integer> |
| 772 | |
| 773 | lockd.nlm_udpport=M [NFS] Assign UDP port. |
| 774 | Format: <integer> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
| 776 | logibm.irq= [HW,MOUSE] Logitech Bus Mouse Driver |
| 777 | Format: <irq> |
| 778 | |
| 779 | loglevel= All Kernel Messages with a loglevel smaller than the |
| 780 | console loglevel will be printed to the console. It can |
| 781 | also be changed with klogd or other programs. The |
| 782 | loglevels are defined as follows: |
| 783 | |
| 784 | 0 (KERN_EMERG) system is unusable |
| 785 | 1 (KERN_ALERT) action must be taken immediately |
| 786 | 2 (KERN_CRIT) critical conditions |
| 787 | 3 (KERN_ERR) error conditions |
| 788 | 4 (KERN_WARNING) warning conditions |
| 789 | 5 (KERN_NOTICE) normal but significant condition |
| 790 | 6 (KERN_INFO) informational |
| 791 | 7 (KERN_DEBUG) debug-level messages |
| 792 | |
| 793 | log_buf_len=n Sets the size of the printk ring buffer, in bytes. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 794 | Format: { n | nk | nM } |
| 795 | n must be a power of two. The default size |
| 796 | is set in the kernel config file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | lp=0 [LP] Specify parallel ports to use, e.g, |
| 799 | lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses |
| 800 | lp=reset first parallel port). 'lp=0' disables the |
| 801 | lp=auto printer driver. 'lp=reset' (which can be |
| 802 | specified in addition to the ports) causes |
| 803 | attached printers to be reset. Using |
| 804 | lp=port1,port2,... specifies the parallel ports |
| 805 | to associate lp devices with, starting with |
| 806 | lp0. A port specification may be 'none' to skip |
| 807 | that lp device, or a parport name such as |
| 808 | 'parport0'. Specifying 'lp=auto' instead of a |
| 809 | port specification list means that device IDs |
| 810 | from each port should be examined, to see if |
| 811 | an IEEE 1284-compliant printer is attached; if |
| 812 | so, the driver will manage that printer. |
| 813 | See also header of drivers/char/lp.c. |
| 814 | |
| 815 | lpj=n [KNL] |
| 816 | Sets loops_per_jiffy to given constant, thus avoiding |
| 817 | time-consuming boot-time autodetection (up to 250 ms per |
| 818 | CPU). 0 enables autodetection (default). To determine |
| 819 | the correct value for your kernel, boot with normal |
| 820 | autodetection and see what value is printed. Note that |
| 821 | on SMP systems the preset will be applied to all CPUs, |
| 822 | which is likely to cause problems if your CPUs need |
| 823 | significantly divergent settings. An incorrect value |
| 824 | will cause delays in the kernel to be wrong, leading to |
| 825 | unpredictable I/O errors and other breakage. Although |
| 826 | unlikely, in the extreme case this might damage your |
| 827 | hardware. |
| 828 | |
| 829 | ltpc= [NET] |
| 830 | Format: <io>,<irq>,<dma> |
| 831 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 832 | mac5380= [HW,SCSI] Format: |
| 833 | <can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 835 | mac53c9x= [HW,SCSI] Format: |
| 836 | <num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 838 | machvec= [IA64] Force the use of a particular machine-vector |
| 839 | (machvec) in a generic kernel. |
| 840 | Example: machvec=hpzx1_swiotlb |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 842 | max_loop= [LOOP] Maximum number of loopback devices that can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | be mounted |
| 844 | Format: <1-256> |
| 845 | |
| 846 | maxcpus= [SMP] Maximum number of processors that an SMP kernel |
| 847 | should make use of |
| 848 | |
Bob Picco | 2b2c375 | 2005-06-29 18:00:00 -0700 | [diff] [blame] | 849 | max_addr=[KMG] [KNL,BOOT,ia64] All physical memory greater than or |
| 850 | equal to this physical address is ignored. |
| 851 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 852 | max_luns= [SCSI] Maximum number of LUNs to probe. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | Should be between 1 and 2^32-1. |
| 854 | |
| 855 | max_report_luns= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 856 | [SCSI] Maximum number of LUNs received. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | Should be between 1 and 16384. |
| 858 | |
| 859 | mca-pentium [BUGS=IA-32] |
| 860 | |
| 861 | mcatest= [IA-64] |
| 862 | |
| 863 | mcd= [HW,CD] |
| 864 | Format: <port>,<irq>,<mitsumi_bug_93_wait> |
| 865 | |
| 866 | mcdx= [HW,CD] |
| 867 | |
| 868 | mce [IA-32] Machine Check Exception |
| 869 | |
| 870 | md= [HW] RAID subsystems devices and level |
| 871 | See Documentation/md.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | mdacon= [MDA] |
| 874 | Format: <first>,<last> |
| 875 | Specifies range of consoles to be captured by the MDA. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 876 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory |
| 878 | Amount of memory to be used when the kernel is not able |
| 879 | to see the whole system memory or for test. |
| 880 | [IA-32] Use together with memmap= to avoid physical |
| 881 | address space collisions. Without memmap= PCI devices |
| 882 | could be placed at addresses belonging to unused RAM. |
| 883 | |
| 884 | mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel |
| 885 | memory. |
| 886 | |
akpm@osdl.org | 69cda7b | 2006-01-09 20:51:46 -0800 | [diff] [blame] | 887 | memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | E820 memory map, as specified by the user. |
| 889 | Such memmap=exactmap lines can be constructed based on |
| 890 | BIOS output or other requirements. See the memmap=nn@ss |
| 891 | option description. |
| 892 | |
| 893 | memmap=nn[KMG]@ss[KMG] |
| 894 | [KNL] Force usage of a specific region of memory |
| 895 | Region of memory to be used, from ss to ss+nn. |
| 896 | |
| 897 | memmap=nn[KMG]#ss[KMG] |
| 898 | [KNL,ACPI] Mark specific memory as ACPI data. |
| 899 | Region of memory to be used, from ss to ss+nn. |
| 900 | |
| 901 | memmap=nn[KMG]$ss[KMG] |
| 902 | [KNL,ACPI] Mark specific memory as reserved. |
| 903 | Region of memory to be used, from ss to ss+nn. |
| 904 | |
| 905 | meye.*= [HW] Set MotionEye Camera parameters |
| 906 | See Documentation/video4linux/meye.txt. |
| 907 | |
| 908 | mga= [HW,DRM] |
| 909 | |
akpm@osdl.org | 198e2f1 | 2006-01-12 01:05:30 -0800 | [diff] [blame] | 910 | migration_cost= |
| 911 | [KNL,SMP] debug: override scheduler migration costs |
| 912 | Format: <level-1-usecs>,<level-2-usecs>,... |
| 913 | This debugging option can be used to override the |
| 914 | default scheduler migration cost matrix. The numbers |
| 915 | are indexed by 'CPU domain distance'. |
| 916 | E.g. migration_cost=1000,2000,3000 on an SMT NUMA |
| 917 | box will set up an intra-core migration cost of |
| 918 | 1 msec, an inter-core migration cost of 2 msecs, |
| 919 | and an inter-node migration cost of 3 msecs. |
| 920 | |
| 921 | WARNING: using the wrong values here can break |
| 922 | scheduler performance, so it's only for scheduler |
| 923 | development purposes, not production environments. |
| 924 | |
| 925 | migration_debug= |
| 926 | [KNL,SMP] migration cost auto-detect verbosity |
| 927 | Format=<0|1|2> |
| 928 | If a system's migration matrix reported at bootup |
| 929 | seems erroneous then this option can be used to |
| 930 | increase verbosity of the detection process. |
| 931 | We default to 0 (no extra messages), 1 will print |
| 932 | some more information, and 2 will be really |
| 933 | verbose (probably only useful if you also have a |
| 934 | serial console attached to the system). |
| 935 | |
| 936 | migration_factor= |
| 937 | [KNL,SMP] multiply/divide migration costs by a factor |
| 938 | Format=<percent> |
| 939 | This debug option can be used to proportionally |
| 940 | increase or decrease the auto-detected migration |
| 941 | costs for all entries of the migration matrix. |
| 942 | E.g. migration_factor=150 will increase migration |
| 943 | costs by 50%. (and thus the scheduler will be less |
| 944 | eager migrating cache-hot tasks) |
| 945 | migration_factor=80 will decrease migration costs |
| 946 | by 20%. (thus the scheduler will be more eager to |
| 947 | migrate tasks) |
| 948 | |
| 949 | WARNING: using the wrong values here can break |
| 950 | scheduler performance, so it's only for scheduler |
| 951 | development purposes, not production environments. |
| 952 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | mousedev.tap_time= |
| 954 | [MOUSE] Maximum time between finger touching and |
| 955 | leaving touchpad surface for touch to be considered |
| 956 | a tap and be reported as a left button click (for |
| 957 | touchpads working in absolute mode only). |
| 958 | Format: <msecs> |
| 959 | mousedev.xres= [MOUSE] Horizontal screen resolution, used for devices |
| 960 | reporting absolute coordinates, such as tablets |
| 961 | mousedev.yres= [MOUSE] Vertical screen resolution, used for devices |
| 962 | reporting absolute coordinates, such as tablets |
| 963 | |
| 964 | mpu401= [HW,OSS] |
| 965 | Format: <io>,<irq> |
| 966 | |
| 967 | MTD_Partition= [MTD] |
| 968 | Format: <name>,<region-number>,<size>,<offset> |
| 969 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 970 | MTD_Region= [MTD] Format: |
| 971 | <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
| 973 | mtdparts= [MTD] |
| 974 | See drivers/mtd/cmdline.c. |
| 975 | |
| 976 | mtouchusb.raw_coordinates= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 977 | [HW] Make the MicroTouch USB driver use raw coordinates |
| 978 | ('y', default) or cooked coordinates ('n') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
| 980 | n2= [NET] SDL Inc. RISCom/N2 synchronous serial card |
| 981 | |
| 982 | NCR_D700= [HW,SCSI] |
| 983 | See header of drivers/scsi/NCR_D700.c. |
| 984 | |
| 985 | ncr5380= [HW,SCSI] |
| 986 | |
| 987 | ncr53c400= [HW,SCSI] |
| 988 | |
| 989 | ncr53c400a= [HW,SCSI] |
| 990 | |
| 991 | ncr53c406a= [HW,SCSI] |
| 992 | |
| 993 | ncr53c8xx= [HW,SCSI] |
| 994 | |
| 995 | netdev= [NET] Network devices parameters |
| 996 | Format: <irq>,<io>,<mem_start>,<mem_end>,<name> |
| 997 | Note that mem_start is often overloaded to mean |
| 998 | something different and driver-specific. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 999 | This usage is only documented in each driver source |
| 1000 | file if at all. |
| 1001 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | nfsaddrs= [NFS] |
| 1003 | See Documentation/nfsroot.txt. |
| 1004 | |
| 1005 | nfsroot= [NFS] nfs root filesystem for disk-less boxes. |
| 1006 | See Documentation/nfsroot.txt. |
| 1007 | |
Trond Myklebust | a72b442 | 2006-01-03 09:55:41 +0100 | [diff] [blame] | 1008 | nfs.callback_tcpport= |
| 1009 | [NFS] set the TCP port on which the NFSv4 callback |
| 1010 | channel should listen. |
| 1011 | |
Trond Myklebust | 58df095 | 2006-01-03 09:55:57 +0100 | [diff] [blame] | 1012 | nfs.idmap_cache_timeout= |
| 1013 | [NFS] set the maximum lifetime for idmapper cache |
| 1014 | entries. |
| 1015 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels |
| 1017 | |
| 1018 | no387 [BUGS=IA-32] Tells the kernel to use the 387 maths |
| 1019 | emulation library even if a 387 maths coprocessor |
| 1020 | is present. |
| 1021 | |
Paul Menage | 3395ee0 | 2006-12-06 20:32:16 -0800 | [diff] [blame] | 1022 | noaliencache [MM, NUMA] Disables the allcoation of alien caches in |
| 1023 | the slab allocator. Saves per-node memory, but will |
| 1024 | impact performance on real NUMA hardware. |
| 1025 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1026 | noalign [KNL,ARM] |
| 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | noapic [SMP,APIC] Tells the kernel to not make use of any |
| 1029 | IOAPICs that may be present in the system. |
| 1030 | |
| 1031 | noasync [HW,M68K] Disables async and sync negotiation for |
| 1032 | all devices. |
| 1033 | |
| 1034 | nobats [PPC] Do not use BATs for mapping kernel lowmem |
| 1035 | on "Classic" PPC cores. |
| 1036 | |
| 1037 | nocache [ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1038 | |
Shailabh Nagar | 163ecdf | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 1039 | nodelayacct [KNL] Disable per-task delay accounting |
| 1040 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | nodisconnect [HW,SCSI,M68K] Disables SCSI disconnects. |
| 1042 | |
| 1043 | noexec [IA-64] |
| 1044 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1045 | noexec [IA-32,X86-64] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | noexec=on: enable non-executable mappings (default) |
| 1047 | noexec=off: disable nn-executable mappings |
| 1048 | |
Chuck Ebbert | 4f88651 | 2006-03-23 02:59:34 -0800 | [diff] [blame] | 1049 | nofxsr [BUGS=IA-32] Disables x86 floating point extended |
| 1050 | register save and restore. The kernel will only save |
| 1051 | legacy floating-point registers on task switch. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
| 1053 | nohlt [BUGS=ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1054 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | no-hlt [BUGS=IA-32] Tells the kernel that the hlt |
| 1056 | instruction doesn't work correctly and not to |
| 1057 | use it. |
| 1058 | |
| 1059 | nohalt [IA-64] Tells the kernel not to use the power saving |
| 1060 | function PAL_HALT_LIGHT when idle. This increases |
| 1061 | power-consumption. On the positive side, it reduces |
| 1062 | interrupt wake-up latency, which may improve performance |
| 1063 | in certain environments such as networked servers or |
| 1064 | real-time systems. |
| 1065 | |
Zachary Amsden | 8542b20 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 1066 | noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing |
| 1067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | noirqdebug [IA-32] Disables the code which attempts to detect and |
| 1069 | disable unhandled interrupt sources. |
| 1070 | |
Zachary Amsden | 8542b20 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 1071 | no_timer_check [IA-32,X86_64,APIC] Disables the code which tests for |
| 1072 | broken timer IRQ sources. |
| 1073 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | noisapnp [ISAPNP] Disables ISA PnP code. |
| 1075 | |
| 1076 | noinitrd [RAM] Tells the kernel not to load any configured |
| 1077 | initial RAM disk. |
| 1078 | |
| 1079 | nointroute [IA-64] |
| 1080 | |
| 1081 | nolapic [IA-32,APIC] Do not enable or use the local APIC. |
| 1082 | |
| 1083 | noltlbs [PPC] Do not use large page/tlb entries for kernel |
| 1084 | lowmem mapping on PPC40x. |
| 1085 | |
Horms | 312f1f0 | 2006-02-22 09:57:55 +0900 | [diff] [blame] | 1086 | nomca [IA-64] Disable machine check abort handling |
| 1087 | |
Horms | abe37e5 | 2006-04-01 01:36:09 +0200 | [diff] [blame] | 1088 | nomce [IA-32] Machine Check Exception |
| 1089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | noresidual [PPC] Don't use residual data on PReP machines. |
| 1091 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1092 | noresume [SWSUSP] Disables resume and restores original swap |
| 1093 | space. |
| 1094 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | no-scroll [VGA] Disables scrollback. |
| 1096 | This is required for the Braillex ib80-piezo Braille |
| 1097 | reader made by F.H. Papenmeier (Germany). |
| 1098 | |
| 1099 | nosbagart [IA-64] |
| 1100 | |
Chuck Ebbert | 4f88651 | 2006-03-23 02:59:34 -0800 | [diff] [blame] | 1101 | nosep [BUGS=IA-32] Disables x86 SYSENTER/SYSEXIT support. |
| 1102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | nosmp [SMP] Tells an SMP kernel to act as a UP kernel. |
| 1104 | |
| 1105 | nosync [HW,M68K] Disables sync negotiation for all devices. |
| 1106 | |
| 1107 | notsc [BUGS=IA-32] Disable Time Stamp Counter |
| 1108 | |
| 1109 | nousb [USB] Disable the USB subsystem |
| 1110 | |
| 1111 | nowb [ARM] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1112 | |
Dave Jones | a61c2d7 | 2006-01-07 23:18:19 +0000 | [diff] [blame] | 1113 | nr_uarts= [SERIAL] maximum number of UARTs to be registered. |
| 1114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | opl3= [HW,OSS] |
| 1116 | Format: <io> |
| 1117 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1118 | opl3sa2= [HW,OSS] Format: |
| 1119 | <io>,<irq>,<dma>,<dma2>,<mss_io>,<mpu_io>,<ymode>,<loopback>[,<isapnp>,<multiple] |
| 1120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | oprofile.timer= [HW] |
| 1122 | Use timer interrupt instead of performance counters |
| 1123 | |
| 1124 | optcd= [HW,CD] |
| 1125 | Format: <io> |
| 1126 | |
| 1127 | osst= [HW,SCSI] SCSI Tape Driver |
| 1128 | Format: <buffer_size>,<write_threshold> |
| 1129 | See also Documentation/scsi/st.txt. |
| 1130 | |
| 1131 | panic= [KNL] Kernel behaviour on panic |
| 1132 | Format: <timeout> |
| 1133 | |
| 1134 | parkbd.port= [HW] Parallel port number the keyboard adapter is |
| 1135 | connected to, default is 0. |
| 1136 | Format: <parport#> |
| 1137 | parkbd.mode= [HW] Parallel port keyboard adapter mode of operation, |
| 1138 | 0 for XT, 1 for AT (default is AT). |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1139 | Format: <mode> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1141 | parport= [HW,PPT] Specify parallel ports. 0 disables. |
| 1142 | Format: { 0 | auto | 0xBBB[,IRQ[,DMA]] } |
| 1143 | Use 'auto' to force the driver to use any |
| 1144 | IRQ/DMA settings detected (the default is to |
| 1145 | ignore detected IRQ/DMA settings because of |
| 1146 | possible conflicts). You can specify the base |
| 1147 | address, IRQ, and DMA settings; IRQ and DMA |
| 1148 | should be numbers, or 'auto' (for using detected |
| 1149 | settings on that particular port), or 'nofifo' |
| 1150 | (to avoid using a FIFO even if it is detected). |
| 1151 | Parallel ports are assigned in the order they |
| 1152 | are specified on the command line, starting |
| 1153 | with parport0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1155 | parport_init_mode= [HW,PPT] |
| 1156 | Configure VIA parallel port to operate in |
| 1157 | a specific mode. This is necessary on Pegasos |
| 1158 | computer where firmware has no options for setting |
| 1159 | up parallel port mode and sets it to spp. |
| 1160 | Currently this function knows 686a and 8231 chips. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | Format: [spp|ps2|epp|ecp|ecpepp] |
| 1162 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1163 | pas2= [HW,OSS] Format: |
| 1164 | <io>,<irq>,<dma>,<dma16>,<sb_io>,<sb_irq>,<sb_dma>,<sb_dma16> |
| 1165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | pas16= [HW,SCSI] |
| 1167 | See header of drivers/scsi/pas16.c. |
| 1168 | |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 1169 | pause_on_oops= |
| 1170 | Halt all CPUs after the first oops has been printed for |
| 1171 | the specified number of seconds. This is to be used if |
| 1172 | your oopses keep scrolling off the screen. |
| 1173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | pcbit= [HW,ISDN] |
| 1175 | |
| 1176 | pcd. [PARIDE] |
| 1177 | See header of drivers/block/paride/pcd.c. |
| 1178 | See also Documentation/paride.txt. |
| 1179 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1180 | pci=option[,option...] [PCI] various PCI subsystem options: |
| 1181 | off [IA-32] don't probe for the PCI bus |
| 1182 | bios [IA-32] force use of PCI BIOS, don't access |
| 1183 | the hardware directly. Use this if your machine |
| 1184 | has a non-standard PCI host bridge. |
| 1185 | nobios [IA-32] disallow use of PCI BIOS, only direct |
| 1186 | hardware access methods are allowed. Use this |
| 1187 | if you experience crashes upon bootup and you |
| 1188 | suspect they are caused by the BIOS. |
| 1189 | conf1 [IA-32] Force use of PCI Configuration |
| 1190 | Mechanism 1. |
| 1191 | conf2 [IA-32] Force use of PCI Configuration |
| 1192 | Mechanism 2. |
Bjorn Helgaas | 61be6d6 | 2006-02-15 15:17:43 -0800 | [diff] [blame] | 1193 | nommconf [IA-32,X86_64] Disable use of MMCONFIG for PCI |
| 1194 | Configuration |
Matthew Wilcox | 309e57d | 2006-03-05 22:33:34 -0700 | [diff] [blame] | 1195 | nomsi [MSI] If the PCI_MSI kernel config parameter is |
| 1196 | enabled, this kernel boot option can be used to |
| 1197 | disable the use of MSI interrupts system-wide. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1198 | nosort [IA-32] Don't sort PCI devices according to |
| 1199 | order given by the PCI BIOS. This sorting is |
| 1200 | done to get a device order compatible with |
| 1201 | older kernels. |
| 1202 | biosirq [IA-32] Use PCI BIOS calls to get the interrupt |
| 1203 | routing table. These calls are known to be buggy |
| 1204 | on several machines and they hang the machine |
| 1205 | when used, but on other computers it's the only |
| 1206 | way to get the interrupt routing table. Try |
| 1207 | this option if the kernel is unable to allocate |
| 1208 | IRQs or discover secondary PCI buses on your |
| 1209 | motherboard. |
| 1210 | rom [IA-32] Assign address space to expansion ROMs. |
| 1211 | Use with caution as certain devices share |
| 1212 | address decoders between ROMs and other |
| 1213 | resources. |
| 1214 | irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be |
| 1215 | assigned automatically to PCI devices. You can |
| 1216 | make the kernel exclude IRQs of your ISA cards |
| 1217 | this way. |
jayalk@intworks.biz | 120bb42 | 2005-03-21 20:20:42 -0800 | [diff] [blame] | 1218 | pirqaddr=0xAAAAA [IA-32] Specify the physical address |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1219 | of the PIRQ table (normally generated |
| 1220 | by the BIOS) if it is outside the |
| 1221 | F0000h-100000h range. |
| 1222 | lastbus=N [IA-32] Scan all buses thru bus #N. Can be |
| 1223 | useful if the kernel is unable to find your |
| 1224 | secondary buses and you want to tell it |
| 1225 | explicitly which ones they are. |
| 1226 | assign-busses [IA-32] Always assign all PCI bus |
| 1227 | numbers ourselves, overriding |
| 1228 | whatever the firmware may have done. |
| 1229 | usepirqmask [IA-32] Honor the possible IRQ mask stored |
| 1230 | in the BIOS $PIR table. This is needed on |
| 1231 | some systems with broken BIOSes, notably |
| 1232 | some HP Pavilion N5400 and Omnibook XE3 |
| 1233 | notebooks. This will have no effect if ACPI |
| 1234 | IRQ routing is enabled. |
| 1235 | noacpi [IA-32] Do not use ACPI for IRQ routing |
| 1236 | or for PCI scanning. |
| 1237 | routeirq Do IRQ routing for all PCI devices. |
| 1238 | This is normally done in pci_enable_device(), |
| 1239 | so this option is a temporary workaround |
| 1240 | for broken drivers that don't call it. |
| 1241 | firmware [ARM] Do not re-enumerate the bus but instead |
| 1242 | just use the configuration from the |
| 1243 | bootloader. This is currently used on |
| 1244 | IXP2000 systems where the bus has to be |
| 1245 | configured a certain way for adjunct CPUs. |
Andi Kleen | 0637a70 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 1246 | noearly [X86] Don't do any early type 1 scanning. |
| 1247 | This might help on some broken boards which |
| 1248 | machine check when some devices' config space |
| 1249 | is read. But various workarounds are disabled |
| 1250 | and some IOMMU drivers will not work. |
Matt Domsch | 6b4b78f | 2006-09-29 15:23:23 -0500 | [diff] [blame] | 1251 | bfsort Sort PCI devices into breadth-first order. |
| 1252 | This sorting is done to get a device |
| 1253 | order compatible with older (<= 2.4) kernels. |
| 1254 | nobfsort Don't sort PCI devices into breadth-first order. |
| 1255 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | pcmv= [HW,PCMCIA] BadgePAD 4 |
| 1257 | |
| 1258 | pd. [PARIDE] |
| 1259 | See Documentation/paride.txt. |
| 1260 | |
| 1261 | pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at |
| 1262 | boot time. |
| 1263 | Format: { 0 | 1 } |
| 1264 | See arch/parisc/kernel/pdc_chassis.c |
| 1265 | |
| 1266 | pf. [PARIDE] |
| 1267 | See Documentation/paride.txt. |
| 1268 | |
| 1269 | pg. [PARIDE] |
| 1270 | See Documentation/paride.txt. |
| 1271 | |
| 1272 | pirq= [SMP,APIC] Manual mp-table setup |
| 1273 | See Documentation/i386/IO-APIC.txt. |
| 1274 | |
| 1275 | plip= [PPT,NET] Parallel port network link |
| 1276 | Format: { parport<nr> | timid | 0 } |
| 1277 | See also Documentation/parport.txt. |
| 1278 | |
| 1279 | pnpacpi= [ACPI] |
| 1280 | { off } |
| 1281 | |
| 1282 | pnpbios= [ISAPNP] |
| 1283 | { on | off | curr | res | no-curr | no-res } |
| 1284 | |
| 1285 | pnp_reserve_irq= |
| 1286 | [ISAPNP] Exclude IRQs for the autoconfiguration |
| 1287 | |
| 1288 | pnp_reserve_dma= |
| 1289 | [ISAPNP] Exclude DMAs for the autoconfiguration |
| 1290 | |
| 1291 | pnp_reserve_io= [ISAPNP] Exclude I/O ports for the autoconfiguration |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1292 | Ranges are in pairs (I/O port base and size). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | |
| 1294 | pnp_reserve_mem= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1295 | [ISAPNP] Exclude memory regions for the |
| 1296 | autoconfiguration. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | Ranges are in pairs (memory base and size). |
| 1298 | |
| 1299 | profile= [KNL] Enable kernel profiling via /proc/profile |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1300 | Format: [schedule,]<number> |
| 1301 | Param: "schedule" - profile schedule points. |
| 1302 | Param: <number> - step/bucket size as a power of 2 for |
| 1303 | statistical time based profiling. |
Ingo Molnar | ece8a68 | 2006-12-06 20:37:24 -0800 | [diff] [blame] | 1304 | Param: "sleep" - profile D-state sleeping (millisecs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1306 | processor.max_cstate= [HW,ACPI] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | Limit processor to maximum C-state |
| 1308 | max_cstate=9 overrides any DMI blacklist limit. |
| 1309 | |
Len Brown | 41c0d86 | 2005-12-28 12:43:51 -0500 | [diff] [blame] | 1310 | processor.nocst [HW,ACPI] |
| 1311 | Ignore the _CST method to determine C-states, |
| 1312 | instead using the legacy FADT method |
| 1313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk |
| 1315 | before loading. |
| 1316 | See Documentation/ramdisk.txt. |
| 1317 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1318 | psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to |
| 1319 | probe for; one of (bare|imps|exps|lifebook|any). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports |
| 1321 | per second. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1322 | psmouse.resetafter= [HW,MOUSE] |
| 1323 | Try to reset the device after so many bad packets |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | (0 = never). |
| 1325 | psmouse.resolution= |
| 1326 | [HW,MOUSE] Set desired mouse resolution, in dpi. |
| 1327 | psmouse.smartscroll= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1328 | [HW,MOUSE] Controls Logitech smartscroll autorepeat. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | 0 = disabled, 1 = enabled (default). |
| 1330 | |
| 1331 | pss= [HW,OSS] Personal Sound System (ECHO ESC614) |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1332 | Format: |
| 1333 | <io>,<mss_io>,<mss_irq>,<mss_dma>,<mpu_io>,<mpu_irq> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | |
| 1335 | pt. [PARIDE] |
| 1336 | See Documentation/paride.txt. |
| 1337 | |
Randy Dunlap | 7d2c502 | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 1338 | quiet [KNL] Disable most log messages |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | r128= [HW,DRM] |
| 1341 | |
| 1342 | raid= [HW,RAID] |
| 1343 | See Documentation/md.txt. |
| 1344 | |
| 1345 | ramdisk= [RAM] Sizes of RAM disks in kilobytes [deprecated] |
| 1346 | See Documentation/ramdisk.txt. |
| 1347 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1348 | ramdisk_blocksize= [RAM] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | See Documentation/ramdisk.txt. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | ramdisk_size= [RAM] Sizes of RAM disks in kilobytes |
| 1352 | New name for the ramdisk parameter. |
| 1353 | See Documentation/ramdisk.txt. |
| 1354 | |
Dipankar Sarma | 21a1ea9 | 2006-03-07 21:55:33 -0800 | [diff] [blame] | 1355 | rcu.blimit= [KNL,BOOT] Set maximum number of finished |
| 1356 | RCU callbacks to process in one batch. |
| 1357 | |
| 1358 | rcu.qhimark= [KNL,BOOT] Set threshold of queued |
| 1359 | RCU callbacks over which batch limiting is disabled. |
| 1360 | |
| 1361 | rcu.qlowmark= [KNL,BOOT] Set threshold of queued |
| 1362 | RCU callbacks below which batch limiting is re-enabled. |
| 1363 | |
Olof Johansson | ffdfc40 | 2005-09-06 15:17:19 -0700 | [diff] [blame] | 1364 | rdinit= [KNL] |
| 1365 | Format: <full_path> |
| 1366 | Run specified binary instead of /init from the ramdisk, |
| 1367 | used for early userspace startup. See initrd. |
| 1368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode |
| 1370 | Format: <reboot_mode>[,<reboot_mode2>[,...]] |
Michael Opdenacker | f3e299f | 2006-10-03 23:19:24 +0200 | [diff] [blame] | 1371 | See arch/*/kernel/reboot.c or arch/*/kernel/process.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | |
| 1373 | reserve= [KNL,BUGS] Force the kernel to ignore some iomem area |
| 1374 | |
Zachary Amsden | 461a9af | 2006-09-25 23:32:25 -0700 | [diff] [blame] | 1375 | reservetop= [IA-32] |
| 1376 | Format: nn[KMG] |
| 1377 | Reserves a hole at the top of the kernel virtual |
| 1378 | address space. |
| 1379 | |
Vivek Goyal | 7e96287 | 2006-09-27 01:50:44 -0700 | [diff] [blame] | 1380 | reset_devices [KNL] Force drivers to reset the underlying device |
| 1381 | during initialization. |
| 1382 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1383 | resume= [SWSUSP] |
| 1384 | Specify the partition device for software suspend |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | |
Rafael J. Wysocki | ecbd0da | 2006-12-06 20:34:13 -0800 | [diff] [blame] | 1386 | resume_offset= [SWSUSP] |
| 1387 | Specify the offset from the beginning of the partition |
| 1388 | given by "resume=" at which the swap header is located, |
| 1389 | in <PAGE_SIZE> units (needed only for swap files). |
| 1390 | See Documentation/power/swsusp-and-swap-files.txt |
| 1391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | rhash_entries= [KNL,NET] |
| 1393 | Set number of hash buckets for route cache |
| 1394 | |
| 1395 | riscom8= [HW,SERIAL] |
| 1396 | Format: <io_board1>[,<io_board2>[,...<io_boardN>]] |
| 1397 | |
| 1398 | ro [KNL] Mount root device read-only on boot |
| 1399 | |
| 1400 | root= [KNL] Root filesystem |
| 1401 | |
| 1402 | rootdelay= [KNL] Delay (in seconds) to pause before attempting to |
| 1403 | mount the root filesystem |
| 1404 | |
| 1405 | rootflags= [KNL] Set root filesystem mount option string |
| 1406 | |
| 1407 | rootfstype= [KNL] Set root filesystem type |
| 1408 | |
| 1409 | rw [KNL] Mount root device read-write on boot |
| 1410 | |
| 1411 | S [KNL] Run init in single mode |
| 1412 | |
| 1413 | sa1100ir [NET] |
| 1414 | See drivers/net/irda/sa1100_ir.c. |
| 1415 | |
| 1416 | sb= [HW,OSS] |
| 1417 | Format: <io>,<irq>,<dma>,<dma2> |
| 1418 | |
| 1419 | sbni= [NET] Granch SBNI12 leased line adapter |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | sbpcd= [HW,CD] Soundblaster CD adapter |
| 1422 | Format: <io>,<type> |
| 1423 | See a comment before function sbpcd_setup() in |
| 1424 | drivers/cdrom/sbpcd.c. |
| 1425 | |
| 1426 | sc1200wdt= [HW,WDT] SC1200 WDT (watchdog) driver |
| 1427 | Format: <io>[,<timeout>[,<isapnp>]] |
| 1428 | |
| 1429 | scsi_debug_*= [SCSI] |
| 1430 | See drivers/scsi/scsi_debug.c. |
| 1431 | |
| 1432 | scsi_default_dev_flags= |
| 1433 | [SCSI] SCSI default device flags |
| 1434 | Format: <integer> |
| 1435 | |
| 1436 | scsi_dev_flags= [SCSI] Black/white list entry for vendor and model |
| 1437 | Format: <vendor>:<model>:<flags> |
| 1438 | (flags are integer value) |
| 1439 | |
| 1440 | scsi_logging= [SCSI] |
| 1441 | |
Matthew Wilcox | 3e082a9 | 2006-09-28 15:19:20 -0600 | [diff] [blame] | 1442 | scsi_mod.scan= [SCSI] sync (default) scans SCSI busses as they are |
| 1443 | discovered. async scans them in kernel threads, |
| 1444 | allowing boot to proceed. none ignores them, expecting |
| 1445 | user space to do the scan. |
| 1446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | selinux [SELINUX] Disable or enable SELinux at boot time. |
| 1448 | Format: { "0" | "1" } |
| 1449 | See security/selinux/Kconfig help text. |
| 1450 | 0 -- disable. |
| 1451 | 1 -- enable. |
| 1452 | Default value is set via kernel config option. |
| 1453 | If enabled at boot time, /selinux/disable can be used |
| 1454 | later to disable prior to initial policy load. |
| 1455 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 1456 | selinux_compat_net = |
| 1457 | [SELINUX] Set initial selinux_compat_net flag value. |
| 1458 | Format: { "0" | "1" } |
| 1459 | 0 -- use new secmark-based packet controls |
| 1460 | 1 -- use legacy packet controls |
| 1461 | Default value is 0 (preferred). |
| 1462 | Value can be changed at runtime via |
| 1463 | /selinux/compat_net. |
| 1464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | serialnumber [BUGS=IA-32] |
| 1466 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1467 | sg_def_reserved_size= [SCSI] |
| 1468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | shapers= [NET] |
| 1470 | Maximal number of shapers. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | sim710= [SCSI,HW] |
| 1473 | See header of drivers/scsi/sim710.c. |
| 1474 | |
| 1475 | simeth= [IA-64] |
| 1476 | simscsi= |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | sjcd= [HW,CD] |
| 1479 | Format: <io>,<irq>,<dma> |
| 1480 | See header of drivers/cdrom/sjcd.c. |
| 1481 | |
| 1482 | slram= [HW,MTD] |
| 1483 | |
| 1484 | smart2= [HW] |
| 1485 | Format: <io1>[,<io2>[,...,<io8>]] |
| 1486 | |
| 1487 | snd-ad1816a= [HW,ALSA] |
| 1488 | |
| 1489 | snd-ad1848= [HW,ALSA] |
| 1490 | |
| 1491 | snd-ali5451= [HW,ALSA] |
| 1492 | |
| 1493 | snd-als100= [HW,ALSA] |
| 1494 | |
| 1495 | snd-als4000= [HW,ALSA] |
| 1496 | |
| 1497 | snd-azt2320= [HW,ALSA] |
| 1498 | |
| 1499 | snd-cmi8330= [HW,ALSA] |
| 1500 | |
| 1501 | snd-cmipci= [HW,ALSA] |
| 1502 | |
| 1503 | snd-cs4231= [HW,ALSA] |
| 1504 | |
| 1505 | snd-cs4232= [HW,ALSA] |
| 1506 | |
| 1507 | snd-cs4236= [HW,ALSA] |
| 1508 | |
| 1509 | snd-cs4281= [HW,ALSA] |
| 1510 | |
| 1511 | snd-cs46xx= [HW,ALSA] |
| 1512 | |
| 1513 | snd-dt019x= [HW,ALSA] |
| 1514 | |
| 1515 | snd-dummy= [HW,ALSA] |
| 1516 | |
| 1517 | snd-emu10k1= [HW,ALSA] |
| 1518 | |
| 1519 | snd-ens1370= [HW,ALSA] |
| 1520 | |
| 1521 | snd-ens1371= [HW,ALSA] |
| 1522 | |
| 1523 | snd-es968= [HW,ALSA] |
| 1524 | |
| 1525 | snd-es1688= [HW,ALSA] |
| 1526 | |
| 1527 | snd-es18xx= [HW,ALSA] |
| 1528 | |
| 1529 | snd-es1938= [HW,ALSA] |
| 1530 | |
| 1531 | snd-es1968= [HW,ALSA] |
| 1532 | |
| 1533 | snd-fm801= [HW,ALSA] |
| 1534 | |
| 1535 | snd-gusclassic= [HW,ALSA] |
| 1536 | |
| 1537 | snd-gusextreme= [HW,ALSA] |
| 1538 | |
| 1539 | snd-gusmax= [HW,ALSA] |
| 1540 | |
| 1541 | snd-hdsp= [HW,ALSA] |
| 1542 | |
| 1543 | snd-ice1712= [HW,ALSA] |
| 1544 | |
| 1545 | snd-intel8x0= [HW,ALSA] |
| 1546 | |
| 1547 | snd-interwave= [HW,ALSA] |
| 1548 | |
| 1549 | snd-interwave-stb= |
| 1550 | [HW,ALSA] |
| 1551 | |
| 1552 | snd-korg1212= [HW,ALSA] |
| 1553 | |
| 1554 | snd-maestro3= [HW,ALSA] |
| 1555 | |
| 1556 | snd-mpu401= [HW,ALSA] |
| 1557 | |
| 1558 | snd-mtpav= [HW,ALSA] |
| 1559 | |
| 1560 | snd-nm256= [HW,ALSA] |
| 1561 | |
| 1562 | snd-opl3sa2= [HW,ALSA] |
| 1563 | |
| 1564 | snd-opti92x-ad1848= |
| 1565 | [HW,ALSA] |
| 1566 | |
| 1567 | snd-opti92x-cs4231= |
| 1568 | [HW,ALSA] |
| 1569 | |
| 1570 | snd-opti93x= [HW,ALSA] |
| 1571 | |
| 1572 | snd-pmac= [HW,ALSA] |
| 1573 | |
| 1574 | snd-rme32= [HW,ALSA] |
| 1575 | |
| 1576 | snd-rme96= [HW,ALSA] |
| 1577 | |
| 1578 | snd-rme9652= [HW,ALSA] |
| 1579 | |
| 1580 | snd-sb8= [HW,ALSA] |
| 1581 | |
| 1582 | snd-sb16= [HW,ALSA] |
| 1583 | |
| 1584 | snd-sbawe= [HW,ALSA] |
| 1585 | |
| 1586 | snd-serial= [HW,ALSA] |
| 1587 | |
| 1588 | snd-sgalaxy= [HW,ALSA] |
| 1589 | |
| 1590 | snd-sonicvibes= [HW,ALSA] |
| 1591 | |
| 1592 | snd-sun-amd7930= |
| 1593 | [HW,ALSA] |
| 1594 | |
| 1595 | snd-sun-cs4231= [HW,ALSA] |
| 1596 | |
| 1597 | snd-trident= [HW,ALSA] |
| 1598 | |
| 1599 | snd-usb-audio= [HW,ALSA,USB] |
| 1600 | |
| 1601 | snd-via82xx= [HW,ALSA] |
| 1602 | |
| 1603 | snd-virmidi= [HW,ALSA] |
| 1604 | |
| 1605 | snd-wavefront= [HW,ALSA] |
| 1606 | |
| 1607 | snd-ymfpci= [HW,ALSA] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | sonycd535= [HW,CD] |
| 1610 | Format: <io>[,<irq>] |
| 1611 | |
| 1612 | sonypi.*= [HW] Sony Programmable I/O Control Device driver |
| 1613 | See Documentation/sonypi.txt |
| 1614 | |
| 1615 | specialix= [HW,SERIAL] Specialix multi-serial port adapter |
| 1616 | See Documentation/specialix.txt. |
| 1617 | |
| 1618 | spia_io_base= [HW,MTD] |
| 1619 | spia_fio_base= |
| 1620 | spia_pedr= |
| 1621 | spia_peddr= |
| 1622 | |
| 1623 | sscape= [HW,OSS] |
| 1624 | Format: <io>,<irq>,<dma>,<mpu_io>,<mpu_irq> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | st= [HW,SCSI] SCSI tape parameters (buffers, etc.) |
| 1627 | See Documentation/scsi/st.txt. |
| 1628 | |
| 1629 | st0x= [HW,SCSI] |
| 1630 | See header of drivers/scsi/seagate.c. |
| 1631 | |
| 1632 | sti= [PARISC,HW] |
| 1633 | Format: <num> |
| 1634 | Set the STI (builtin display/keyboard on the HP-PARISC |
| 1635 | machines) console (graphic card) which should be used |
| 1636 | as the initial boot-console. |
| 1637 | See also comment in drivers/video/console/sticore.c. |
| 1638 | |
| 1639 | sti_font= [HW] |
| 1640 | See comment in drivers/video/console/sticore.c. |
| 1641 | |
| 1642 | stifb= [HW] |
| 1643 | Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] |
| 1644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | swiotlb= [IA-64] Number of I/O TLB slabs |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | switches= [HW,M68k] |
| 1648 | |
| 1649 | sym53c416= [HW,SCSI] |
| 1650 | See header of drivers/scsi/sym53c416.c. |
| 1651 | |
| 1652 | t128= [HW,SCSI] |
| 1653 | See header of drivers/scsi/t128.c. |
| 1654 | |
| 1655 | tdfx= [HW,DRM] |
| 1656 | |
| 1657 | thash_entries= [KNL,NET] |
| 1658 | Set number of hash buckets for TCP connection |
| 1659 | |
| 1660 | time Show timing data prefixed to each printk message line |
| 1661 | |
john stultz | 734efb4 | 2006-06-26 00:25:05 -0700 | [diff] [blame] | 1662 | clocksource= [GENERIC_TIME] Override the default clocksource |
| 1663 | Override the default clocksource and use the clocksource |
| 1664 | with the name specified. |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | tipar.timeout= [HW,PPT] |
| 1667 | Set communications timeout in tenths of a second |
| 1668 | (default 15). |
| 1669 | |
| 1670 | tipar.delay= [HW,PPT] |
| 1671 | Set inter-bit delay in microseconds (default 10). |
| 1672 | |
| 1673 | tmc8xx= [HW,SCSI] |
| 1674 | See header of drivers/scsi/seagate.c. |
| 1675 | |
| 1676 | tmscsim= [HW,SCSI] |
| 1677 | See comment before function dc390_setup() in |
| 1678 | drivers/scsi/tmscsim.c. |
| 1679 | |
| 1680 | tp720= [HW,PS2] |
| 1681 | |
| 1682 | trix= [HW,OSS] MediaTrix AudioTrix Pro |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1683 | Format: |
| 1684 | <io>,<irq>,<dma>,<dma2>,<sb_io>,<sb_irq>,<sb_dma>,<mpu_io>,<mpu_irq> |
| 1685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | tsdev.xres= [TS] Horizontal screen resolution. |
| 1687 | tsdev.yres= [TS] Vertical screen resolution. |
| 1688 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1689 | turbografx.map[2|3]= [HW,JOY] |
| 1690 | TurboGraFX parallel port interface |
| 1691 | Format: |
| 1692 | <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | See also Documentation/input/joystick-parport.txt |
| 1694 | |
| 1695 | u14-34f= [HW,SCSI] UltraStor 14F/34F SCSI host adapter |
| 1696 | See header of drivers/scsi/u14-34f.c. |
| 1697 | |
| 1698 | uart401= [HW,OSS] |
| 1699 | Format: <io>,<irq> |
| 1700 | |
| 1701 | uart6850= [HW,OSS] |
| 1702 | Format: <io>,<irq> |
| 1703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | usbhid.mousepoll= |
| 1705 | [USBHID] The interval which mice are to be polled at. |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1706 | |
Ingo Molnar | e6e5494 | 2006-06-27 02:53:50 -0700 | [diff] [blame] | 1707 | vdso= [IA-32] |
| 1708 | vdso=1: enable VDSO (default) |
| 1709 | vdso=0: disable VDSO mapping |
| 1710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | video= [FB] Frame buffer configuration |
| 1712 | See Documentation/fb/modedb.txt. |
| 1713 | |
| 1714 | vga= [BOOT,IA-32] Select a particular video mode |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1715 | See Documentation/i386/boot.txt and |
| 1716 | Documentation/svga.txt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | Use vga=ask for menu. |
| 1718 | This is actually a boot loader parameter; the value is |
| 1719 | passed to the kernel using a special protocol. |
| 1720 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1721 | vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | size of <nn>. This can be used to increase the |
| 1723 | minimum size (128MB on x86). It can also be used to |
| 1724 | decrease the size and leave more room for directly |
| 1725 | mapped kernel RAM. |
| 1726 | |
Peter Oberparleiter | 585c304 | 2006-06-29 15:08:25 +0200 | [diff] [blame] | 1727 | vmhalt= [KNL,S390] Perform z/VM CP command after system halt. |
| 1728 | Format: <command> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | |
Peter Oberparleiter | 585c304 | 2006-06-29 15:08:25 +0200 | [diff] [blame] | 1730 | vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic. |
| 1731 | Format: <command> |
| 1732 | |
| 1733 | vmpoff= [KNL,S390] Perform z/VM CP command after power off. |
| 1734 | Format: <command> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | waveartist= [HW,OSS] |
| 1737 | Format: <io>,<irq>,<dma>,<dma2> |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | wd33c93= [HW,SCSI] |
| 1740 | See header of drivers/scsi/wd33c93.c. |
| 1741 | |
| 1742 | wd7000= [HW,SCSI] |
| 1743 | See header of drivers/scsi/wd7000.c. |
| 1744 | |
| 1745 | wdt= [WDT] Watchdog |
| 1746 | See Documentation/watchdog/watchdog.txt. |
| 1747 | |
| 1748 | xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks. |
| 1749 | xd_geo= See header of drivers/block/xd.c. |
| 1750 | |
| 1751 | xirc2ps_cs= [NET,PCMCIA] |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1752 | Format: |
| 1753 | <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | |
Andi Kleen | a62eaf1 | 2006-02-16 23:41:58 +0100 | [diff] [blame] | 1755 | norandmaps Don't use address space randomization |
| 1756 | Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space |
| 1757 | |
Jan Beulich | 6d0185e | 2006-12-07 02:14:13 +0100 | [diff] [blame] | 1758 | unwind_debug=N N > 0 will enable dwarf2 unwinder debugging |
| 1759 | This is useful to get more information why |
| 1760 | you got a "dwarf2 unwinder stuck" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | |
Randy Dunlap | a991304 | 2005-10-23 12:57:11 -0700 | [diff] [blame] | 1762 | ______________________________________________________________________ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | |
| 1764 | TODO: |
| 1765 | |
| 1766 | Add documentation for ALSA options. |
| 1767 | Add more DRM drivers. |