aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/kernel-parameters.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt147
1 files changed, 72 insertions, 75 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 379931e74334..09c0ec100f61 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -30,6 +30,7 @@ the beginning of each description states the restrictions within which a
parameter is applicable:
ACPI ACPI support is enabled.
+ AGP AGP (Accelerated Graphics Port) is enabled.
ALSA ALSA sound support is enabled.
APIC APIC support is enabled.
APM Advanced Power Management support is enabled.
@@ -40,7 +41,6 @@ parameter is applicable:
EIDE EIDE/ATAPI support is enabled.
FB The frame buffer device is enabled.
HW Appropriate hardware is enabled.
- IA-32 IA-32 aka i386 architecture is enabled.
IA-64 IA-64 architecture is enabled.
IOSCHED More than one I/O scheduler is enabled.
IP_PNP IP DHCP, BOOTP, or RARP is enabled.
@@ -57,14 +57,14 @@ parameter is applicable:
MDA MDA console support is enabled.
MOUSE Appropriate mouse support is enabled.
MSI Message Signaled Interrupts (PCI).
- MTD MTD support is enabled.
+ MTD MTD (Memory Technology Device) support is enabled.
NET Appropriate network support is enabled.
NUMA NUMA support is enabled.
GENERIC_TIME The generic timeofday code is enabled.
NFS Appropriate NFS support is enabled.
OSS OSS sound support is enabled.
- PV_OPS A paravirtualized kernel
- PARIDE The ParIDE subsystem is enabled.
+ PV_OPS A paravirtualized kernel is enabled.
+ PARIDE The ParIDE (parallel port IDE) subsystem is enabled.
PARISC The PA-RISC architecture is enabled.
PCI PCI bus support is enabled.
PCMCIA The PCMCIA subsystem is enabled.
@@ -91,6 +91,7 @@ parameter is applicable:
VT Virtual terminal support is enabled.
WDT Watchdog support is enabled.
XT IBM PC/XT MFM hard disk support is enabled.
+ X86-32 X86-32, aka i386 architecture is enabled.
X86-64 X86-64 architecture is enabled.
More X86-64 boot options can be found in
Documentation/x86_64/boot-options.txt .
@@ -122,10 +123,6 @@ and is between 256 and 4096 characters. It is defined in the file
./include/asm/setup.h as COMMAND_LINE_SIZE.
- 53c7xx= [HW,SCSI] Amiga SCSI controllers
- See header of drivers/scsi/53c7xx.c.
- See also Documentation/scsi/ncr53c7xx.txt.
-
acpi= [HW,ACPI,X86-64,i386]
Advanced Configuration and Power Interface
Format: { force | off | ht | strict | noirq }
@@ -224,11 +221,17 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_fake_ecdt [HW,ACPI] Workaround failure due to BIOS lacking ECDT
- acpi_pm_good [IA-32,X86-64]
+ acpi_pm_good [X86-32,X86-64]
Override the pmtimer bug detection: force the kernel
to assume that this machine's pmtimer latches its value
and always returns good values.
+ agp= [AGP]
+ { off | try_unsupported }
+ off: disable AGP support
+ try_unsupported: try to drive unsupported chipsets
+ (may crash computer or cause data corruption)
+
enable_timer_pin_1 [i386,x86-64]
Enable PIN 1 of APIC timer
Can be useful to work around chipset bugs
@@ -281,7 +284,8 @@ and is between 256 and 4096 characters. It is defined in the file
not play well with APC CPU idle - disable it if you have
APC and your system crashes randomly.
- apic= [APIC,i386] Change the output verbosity whilst booting
+ apic= [APIC,i386] Advanced Programmable Interrupt Controller
+ Change the output verbosity whilst booting
Format: { quiet (default) | verbose | debug }
Change the amount of debugging information output
when initialising the APIC and IO-APIC components.
@@ -355,7 +359,7 @@ and is between 256 and 4096 characters. It is defined in the file
c101= [NET] Moxa C101 synchronous serial card
- cachesize= [BUGS=IA-32] Override level 2 CPU cache size detection.
+ cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
Sometimes CPU hardware bugs make them report the cache
size incorrectly. The kernel will attempt work arounds
to fix known problems, but for some CPUs it is not
@@ -374,7 +378,7 @@ and is between 256 and 4096 characters. It is defined in the file
Value can be changed at runtime via
/selinux/checkreqprot.
- clock= [BUGS=IA-32, HW] gettimeofday clocksource override.
+ clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
[Deprecated]
Forces specified clocksource (if available) to be used
when calculating gettimeofday(). If specified
@@ -392,7 +396,7 @@ and is between 256 and 4096 characters. It is defined in the file
[ARM] imx_timer1,OSTS,netx_timer,mpu_timer2,
pxa_timer,timer3,32k_counter,timer0_1
[AVR32] avr32
- [IA-32] pit,hpet,tsc,vmi-timer;
+ [X86-32] pit,hpet,tsc,vmi-timer;
scx200_hrt on Geode; cyclone on IBM x440
[MIPS] MIPS
[PARISC] cr16
@@ -412,7 +416,7 @@ and is between 256 and 4096 characters. It is defined in the file
over the 8254 in addition to over the IO-APIC. The
kernel tries to set a sensible default.
- hpet= [IA-32,HPET] option to disable HPET and use PIT.
+ hpet= [X86-32,HPET] option to disable HPET and use PIT.
Format: disable
com20020= [HW,NET] ARCnet - COM20020 chipset
@@ -549,7 +553,7 @@ and is between 256 and 4096 characters. It is defined in the file
dtc3181e= [HW,SCSI]
- earlyprintk= [IA-32,X86-64,SH]
+ earlyprintk= [X86-32,X86-64,SH]
earlyprintk=vga
earlyprintk=serial[,ttySn[,baudrate]]
@@ -587,7 +591,7 @@ and is between 256 and 4096 characters. It is defined in the file
eisa_irq_edge= [PARISC,HW]
See header of drivers/parisc/eisa.c.
- elanfreq= [IA-32]
+ elanfreq= [X86-32]
See comment before function elanfreq_setup() in
arch/i386/kernel/cpu/cpufreq/elanfreq.c.
@@ -596,7 +600,7 @@ and is between 256 and 4096 characters. It is defined in the file
See Documentation/block/as-iosched.txt and
Documentation/block/deadline-iosched.txt for details.
- elfcorehdr= [IA-32, X86_64]
+ elfcorehdr= [X86-32, X86_64]
Specifies physical address of start of kernel core
image elf header. Generally kexec loader will
pass this option to capture kernel.
@@ -678,7 +682,7 @@ and is between 256 and 4096 characters. It is defined in the file
hisax= [HW,ISDN]
See Documentation/isdn/README.HiSax.
- hugepages= [HW,IA-32,IA-64] Maximal number of HugeTLB pages.
+ hugepages= [HW,X86-32,IA-64] Maximal number of HugeTLB pages.
i8042.direct [HW] Put keyboard port into non-translated mode
i8042.dumbkbd [HW] Pretend that controller can only read data from
@@ -770,7 +774,8 @@ and is between 256 and 4096 characters. It is defined in the file
See Documentation/nfsroot.txt.
ip2= [HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
- See comment before ip2_setup() in drivers/char/ip2.c.
+ See comment before ip2_setup() in
+ drivers/char/ip2/ip2base.c.
ips= [HW,SCSI] Adaptec / IBM ServeRAID controller
See header of drivers/scsi/ips.c.
@@ -819,7 +824,7 @@ and is between 256 and 4096 characters. It is defined in the file
js= [HW,JOY] Analog joystick
See Documentation/input/joystick.txt.
- kernelcore=nn[KMG] [KNL,IA-32,IA-64,PPC,X86-64] This parameter
+ kernelcore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter
specifies the amount of memory usable by the kernel
for non-movable allocations. The requested amount is
spread evenly throughout all nodes in the system. The
@@ -835,7 +840,7 @@ and is between 256 and 4096 characters. It is defined in the file
use the HighMem zone if it exists, and the Normal
zone if it does not.
- movablecore=nn[KMG] [KNL,IA-32,IA-64,PPC,X86-64] This parameter
+ movablecore=nn[KMG] [KNL,X86-32,IA-64,PPC,X86-64] This parameter
is similar to kernelcore except it specifies the
amount of memory used for migratable allocations.
If both kernelcore and movablecore is specified,
@@ -847,28 +852,20 @@ and is between 256 and 4096 characters. It is defined in the file
keepinitrd [HW,ARM]
- kstack=N [IA-32,X86-64] Print N words from the kernel stack
+ kstack=N [X86-32,X86-64] Print N words from the kernel stack
in oops dumps.
l2cr= [PPC]
- lapic [IA-32,APIC] Enable the local APIC even if BIOS
+ lapic [X86-32,APIC] Enable the local APIC even if BIOS
disabled it.
- lapic_timer_c2_ok [IA-32,x86-64,APIC] trust the local apic timer in
+ lapic_timer_c2_ok [X86-32,x86-64,APIC] trust the local apic timer in
C2 power state.
lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip
Format: addr:<io>,irq:<irq>
- legacy_serial.force [HW,IA-32,X86-64]
- Probe for COM ports at legacy addresses even
- if PNPBIOS or ACPI should describe them. This
- is for working around firmware defects.
-
- llsc*= [IA64] See function print_params() in
- arch/ia64/sn/kernel/llsc4.c.
-
load_ramdisk= [RAM] List of ramdisks to load from floppy
See Documentation/ramdisk.txt.
@@ -974,11 +971,11 @@ and is between 256 and 4096 characters. It is defined in the file
[SCSI] Maximum number of LUNs received.
Should be between 1 and 16384.
- mca-pentium [BUGS=IA-32]
+ mca-pentium [BUGS=X86-32]
mcatest= [IA-64]
- mce [IA-32] Machine Check Exception
+ mce [X86-32] Machine Check Exception
md= [HW] RAID subsystems devices and level
See Documentation/md.txt.
@@ -990,14 +987,14 @@ and is between 256 and 4096 characters. It is defined in the file
mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
Amount of memory to be used when the kernel is not able
to see the whole system memory or for test.
- [IA-32] Use together with memmap= to avoid physical
+ [X86-32] Use together with memmap= to avoid physical
address space collisions. Without memmap= PCI devices
could be placed at addresses belonging to unused RAM.
- mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel
+ mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
memory.
- memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact
+ memmap=exactmap [KNL,X86-32,X86_64] Enable setting of an exact
E820 memory map, as specified by the user.
Such memmap=exactmap lines can be constructed based on
BIOS output or other requirements. See the memmap=nn@ss
@@ -1041,7 +1038,7 @@ and is between 256 and 4096 characters. It is defined in the file
<name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
mtdparts= [MTD]
- See drivers/mtd/cmdline.c.
+ See drivers/mtd/cmdlinepart.c.
mtouchusb.raw_coordinates=
[HW] Make the MicroTouch USB driver use raw coordinates
@@ -1083,9 +1080,9 @@ and is between 256 and 4096 characters. It is defined in the file
[NFS] set the maximum lifetime for idmapper cache
entries.
- nmi_watchdog= [KNL,BUGS=IA-32] Debugging features for SMP kernels
+ nmi_watchdog= [KNL,BUGS=X86-32] Debugging features for SMP kernels
- no387 [BUGS=IA-32] Tells the kernel to use the 387 maths
+ no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
emulation library even if a 387 maths coprocessor
is present.
@@ -1116,17 +1113,17 @@ and is between 256 and 4096 characters. It is defined in the file
noexec [IA-64]
- noexec [IA-32,X86-64]
+ noexec [X86-32,X86-64]
noexec=on: enable non-executable mappings (default)
noexec=off: disable nn-executable mappings
- nofxsr [BUGS=IA-32] Disables x86 floating point extended
+ nofxsr [BUGS=X86-32] Disables x86 floating point extended
register save and restore. The kernel will only save
legacy floating-point registers on task switch.
nohlt [BUGS=ARM]
- no-hlt [BUGS=IA-32] Tells the kernel that the hlt
+ no-hlt [BUGS=X86-32] Tells the kernel that the hlt
instruction doesn't work correctly and not to
use it.
@@ -1141,12 +1138,12 @@ and is between 256 and 4096 characters. It is defined in the file
Valid arguments: on, off
Default: on
- noirqbalance [IA-32,SMP,KNL] Disable kernel irq balancing
+ noirqbalance [X86-32,SMP,KNL] Disable kernel irq balancing
- noirqdebug [IA-32] Disables the code which attempts to detect and
+ noirqdebug [X86-32] Disables the code which attempts to detect and
disable unhandled interrupt sources.
- no_timer_check [IA-32,X86_64,APIC] Disables the code which tests for
+ no_timer_check [X86-32,X86_64,APIC] Disables the code which tests for
broken timer IRQ sources.
noisapnp [ISAPNP] Disables ISA PnP code.
@@ -1158,20 +1155,20 @@ and is between 256 and 4096 characters. It is defined in the file
nojitter [IA64] Disables jitter checking for ITC timers.
- nolapic [IA-32,APIC] Do not enable or use the local APIC.
+ nolapic [X86-32,APIC] Do not enable or use the local APIC.
- nolapic_timer [IA-32,APIC] Do not use the local APIC timer.
+ nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
noltlbs [PPC] Do not use large page/tlb entries for kernel
lowmem mapping on PPC40x.
nomca [IA-64] Disable machine check abort handling
- nomce [IA-32] Machine Check Exception
+ nomce [X86-32] Machine Check Exception
- noreplace-paravirt [IA-32,PV_OPS] Don't patch paravirt_ops
+ noreplace-paravirt [X86-32,PV_OPS] Don't patch paravirt_ops
- noreplace-smp [IA-32,SMP] Don't replace SMP instructions
+ noreplace-smp [X86-32,SMP] Don't replace SMP instructions
with UP alternatives
noresidual [PPC] Don't use residual data on PReP machines.
@@ -1185,7 +1182,7 @@ and is between 256 and 4096 characters. It is defined in the file
nosbagart [IA-64]
- nosep [BUGS=IA-32] Disables x86 SYSENTER/SYSEXIT support.
+ nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
nosmp [SMP] Tells an SMP kernel to act as a UP kernel.
@@ -1193,7 +1190,7 @@ and is between 256 and 4096 characters. It is defined in the file
nosync [HW,M68K] Disables sync negotiation for all devices.
- notsc [BUGS=IA-32] Disable Time Stamp Counter
+ notsc [BUGS=X86-32] Disable Time Stamp Counter
nousb [USB] Disable the USB subsystem
@@ -1266,28 +1263,28 @@ and is between 256 and 4096 characters. It is defined in the file
See also Documentation/paride.txt.
pci=option[,option...] [PCI] various PCI subsystem options:
- off [IA-32] don't probe for the PCI bus
- bios [IA-32] force use of PCI BIOS, don't access
+ off [X86-32] don't probe for the PCI bus
+ bios [X86-32] force use of PCI BIOS, don't access
the hardware directly. Use this if your machine
has a non-standard PCI host bridge.
- nobios [IA-32] disallow use of PCI BIOS, only direct
+ nobios [X86-32] disallow use of PCI BIOS, only direct
hardware access methods are allowed. Use this
if you experience crashes upon bootup and you
suspect they are caused by the BIOS.
- conf1 [IA-32] Force use of PCI Configuration
+ conf1 [X86-32] Force use of PCI Configuration
Mechanism 1.
- conf2 [IA-32] Force use of PCI Configuration
+ conf2 [X86-32] Force use of PCI Configuration
Mechanism 2.
- nommconf [IA-32,X86_64] Disable use of MMCONFIG for PCI
+ nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI
Configuration
nomsi [MSI] If the PCI_MSI kernel config parameter is
enabled, this kernel boot option can be used to
disable the use of MSI interrupts system-wide.
- nosort [IA-32] Don't sort PCI devices according to
+ nosort [X86-32] Don't sort PCI devices according to
order given by the PCI BIOS. This sorting is
done to get a device order compatible with
older kernels.
- biosirq [IA-32] Use PCI BIOS calls to get the interrupt
+ biosirq [X86-32] Use PCI BIOS calls to get the interrupt
routing table. These calls are known to be buggy
on several machines and they hang the machine
when used, but on other computers it's the only
@@ -1295,32 +1292,32 @@ and is between 256 and 4096 characters. It is defined in the file
this option if the kernel is unable to allocate
IRQs or discover secondary PCI buses on your
motherboard.
- rom [IA-32] Assign address space to expansion ROMs.
+ rom [X86-32] Assign address space to expansion ROMs.
Use with caution as certain devices share
address decoders between ROMs and other
resources.
- irqmask=0xMMMM [IA-32] Set a bit mask of IRQs allowed to be
+ irqmask=0xMMMM [X86-32] Set a bit mask of IRQs allowed to be
assigned automatically to PCI devices. You can
make the kernel exclude IRQs of your ISA cards
this way.
- pirqaddr=0xAAAAA [IA-32] Specify the physical address
+ pirqaddr=0xAAAAA [X86-32] Specify the physical address
of the PIRQ table (normally generated
by the BIOS) if it is outside the
F0000h-100000h range.
- lastbus=N [IA-32] Scan all buses thru bus #N. Can be
+ lastbus=N [X86-32] Scan all buses thru bus #N. Can be
useful if the kernel is unable to find your
secondary buses and you want to tell it
explicitly which ones they are.
- assign-busses [IA-32] Always assign all PCI bus
+ assign-busses [X86-32] Always assign all PCI bus
numbers ourselves, overriding
whatever the firmware may have done.
- usepirqmask [IA-32] Honor the possible IRQ mask stored
+ usepirqmask [X86-32] Honor the possible IRQ mask stored
in the BIOS $PIR table. This is needed on
some systems with broken BIOSes, notably
some HP Pavilion N5400 and Omnibook XE3
notebooks. This will have no effect if ACPI
IRQ routing is enabled.
- noacpi [IA-32] Do not use ACPI for IRQ routing
+ noacpi [X86-32] Do not use ACPI for IRQ routing
or for PCI scanning.
routeirq Do IRQ routing for all PCI devices.
This is normally done in pci_enable_device(),
@@ -1469,13 +1466,13 @@ and is between 256 and 4096 characters. It is defined in the file
Run specified binary instead of /init from the ramdisk,
used for early userspace startup. See initrd.
- reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
+ reboot= [BUGS=X86-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
Format: <reboot_mode>[,<reboot_mode2>[,...]]
See arch/*/kernel/reboot.c or arch/*/kernel/process.c
reserve= [KNL,BUGS] Force the kernel to ignore some iomem area
- reservetop= [IA-32]
+ reservetop= [X86-32]
Format: nn[KMG]
Reserves a hole at the top of the kernel virtual
address space.
@@ -1566,7 +1563,7 @@ and is between 256 and 4096 characters. It is defined in the file
Value can be changed at runtime via
/selinux/compat_net.
- serialnumber [BUGS=IA-32]
+ serialnumber [BUGS=X86-32]
sg_def_reserved_size= [SCSI]
@@ -1619,7 +1616,7 @@ and is between 256 and 4096 characters. It is defined in the file
smart2= [HW]
Format: <io1>[,<io2>[,...,<io8>]]
- smp-alt-once [IA-32,SMP] On a hotplug CPU system, only
+ smp-alt-once [X86-32,SMP] On a hotplug CPU system, only
attempt to substitute SMP alternatives once at boot.
smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
@@ -1884,7 +1881,7 @@ and is between 256 and 4096 characters. It is defined in the file
usbhid.mousepoll=
[USBHID] The interval which mice are to be polled at.
- vdso= [IA-32,SH,x86-64]
+ vdso= [X86-32,SH,x86-64]
vdso=2: enable compat VDSO (default with COMPAT_VDSO)
vdso=1: enable VDSO (default)
vdso=0: disable VDSO mapping
@@ -1895,7 +1892,7 @@ and is between 256 and 4096 characters. It is defined in the file
video= [FB] Frame buffer configuration
See Documentation/fb/modedb.txt.
- vga= [BOOT,IA-32] Select a particular video mode
+ vga= [BOOT,X86-32] Select a particular video mode
See Documentation/i386/boot.txt and
Documentation/svga.txt.
Use vga=ask for menu.
@@ -1927,7 +1924,7 @@ and is between 256 and 4096 characters. It is defined in the file
See header of drivers/scsi/wd7000.c.
wdt= [WDT] Watchdog
- See Documentation/watchdog/watchdog.txt.
+ See Documentation/watchdog/wdt.txt.
xd= [HW,XT] Original XT pre-IDE (RLL encoded) disks.
xd_geo= See header of drivers/block/xd.c.

Privacy Policy