uboot中的环境变量.docx
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uboot中的环境变量.docx
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uboot中的环境变量
Thefollowingisaconsolidatedlistofthekernelparametersasimplemented(mostly)bythe__setup()macroandsortedintoEnglishDictionaryorder(definedasignoringallpunctuationandsortingdigitsbeforelettersinacaseinsensitivemanner),andwithdescriptionswhereknown.
Moduleparametersforloadablemodulesarespecifiedonlyastheparameternamewithoptional'='andvalueasappropriate,suchas:
modprobeusbcoreblinkenlights=1
Moduleparametersformodulesthatarebuiltintothekernelimagearespecifiedonthekernelcommandlinewiththemodulenameplus'.'plusparametername,with'='andvalueifappropriate,suchas:
usbcore.blinkenlights=1
Thetextinsquarebracketsatthebeginningofthedescriptionstatestherestrictionsonthekernelforthesaidkernelparametertobevalid.Therestrictionsreferredtoarethattherelevantoptionisvalidif:
ACPIACPIsupportisenabled.
ALSAALSAsoundsupportisenabled.
APICAPICsupportisenabled.
APMAdvancedPowerManagementsupportisenabled.
AX25AppropriateAX.25supportisenabled.
CDAppropriateCDsupportisenabled.
DEVFSdevfssupportisenabled.
DRMDirectRenderingManagementsupportisenabled.
EDDBIOSEnhancedDiskDriveServices(EDD)isenabled
EFIEFIPartitioning(GPT)isenabled
EIDEEIDE/ATAPIsupportisenabled.
FBTheframebufferdeviceisenabled.
HWAppropriatehardwareisenabled.
IA-32IA-32akai386architectureisenabled.
IA-64IA-64architectureisenabled.
IOSCHEDMorethanoneI/Oschedulerisenabled.
IP_PNPIPDHCP,BOOTP,orRARPisenabled.
ISAPNPISAPnPcodeisenabled.
ISDNAppropriateISDNsupportisenabled.
JOYAppropriatejoysticksupportisenabled.
LPPrintersupportisenabled.
LOOPLoopbackdevicesupportisenabled.
M68kM68karchitectureisenabled.
Theseoptionshavemoredetaileddescriptioninsideof
Documentation/m68k/kernel-options.txt.
MCAMCAbussupportisenabled.
MDAMDAconsolesupportisenabled.
MOUSEAppropriatemousesupportisenabled.
MTDMTDsupportisenabled.
NETAppropriatenetworksupportisenabled.
NUMANUMAsupportisenabled.
NFSAppropriateNFSsupportisenabled.
OSSOSSsoundsupportisenabled.
PARIDETheParIDEsubsystemisenabled.
PARISCThePA-RISCarchitectureisenabled.
PCIPCIbussupportisenabled.
PCMCIAThePCMCIAsubsystemisenabled.
PNPPlug&Playsupportisenabled.
PPCPowerPCarchitectureisenabled.
PPTParallelportsupportisenabled.
PS2AppropriatePS/2supportisenabled.
RAMRAMdisksupportisenabled.
S390S390architectureisenabled.
SCSIAppropriateSCSIsupportisenabled.
Alotofdrivershastheiroptionsdescribedinsideof
Documentation/scsi/.
SELINUXSELinuxsupportisenabled.
SERIALSerialsupportisenabled.
SMPThekernelisanSMPkernel.
SPARCSparcarchitectureisenabled.
SWSUSPSoftwaresuspendisenabled.
TSAppropriatetouchscreensupportisenabled.
USBUSBsupportisenabled.
USBHIDUSBHumanInterfaceDevicesupportisenabled.
V4LVideoForLinuxsupportisenabled.
VGATheVGAconsolehasbeenenabled.
VTVirtualterminalsupportisenabled.
WDTWatchdogsupportisenabled.
XTIBMPC/XTMFMharddisksupportisenabled.
X86-64X86-64architectureisenabled.
MoreX86-64bootoptionscanbefoundin
Documentation/x86_64/boot-options.txt.
Inaddition,thefollowingtextindicatesthattheoption:
BUGS=Relatestopossibleprocessorbugsonthesaidprocessor.
KNLIsakernelstart-upparameter.
BOOTIsabootloaderparameter.
ParametersdenotedwithBOOTareactuallyinterpretedbythebootloader,andhavenomeaningtothekerneldirectly.Donotmodifythesyntaxofbootloaderparameterswithoutextremeneedorcoordinationwith
NotethatALLkernelparameterslistedbelowareCASESENSITIVE,andthatatrailing=onthenameofanyparameterstatesthatthatparameterwillbeenteredasanenvironmentvariable,whereasitsabsenceindicatesthatitwillappearasakernelargumentreadablevia/proc/cmdlinebyprogramsrunningoncethesystemisup.
53c7xx=[HW,SCSI]AmigaSCSIcontrollers
Seeheaderofdrivers/scsi/53c7xx.c.
SeealsoDocumentation/scsi/ncr53c7xx.txt.
acpi=[HW,ACPI]AdvancedConfigurationandPowerInterface
Format:
{force|off|ht|strict|noirq}
force--enableACPIifdefaultwasoff
off--disableACPIifdefaultwason
noirq--donotuseACPIforIRQrouting
ht--runonlyenoughACPItoenableHyperThreading
strict--Belesstolerantofplatformsthatarenot
strictlyACPIspecificationcompliant.
SeealsoDocumentation/pm.txt,pci=noacpi
acpi_sleep=[HW,ACPI]Sleepoptions
Format:
{s3_bios,s3_mode}
SeeDocumentation/power/video.txt
acpi_sci=[HW,ACPI]ACPISystemControlInterrupttriggermode
Format:
{level|edge|high|low}
acpi_irq_balance[HW,ACPI]
ACPIwillbalanceactiveIRQs
defaultinAPICmode
acpi_irq_nobalance[HW,ACPI]
ACPIwillnotmoveactiveIRQs(default)
defaultinPICmode
acpi_irq_pci=[HW,ACPI]Ifirq_balance,clearlistedIRQsfor
usebyPCI
Format:
acpi_irq_isa=[HW,ACPI]Ifirq_balance,marklistedIRQsusedbyISA
Format:
acpi_osi=[HW,ACPI]emptyparamdisables_OSI
acpi_serialize[HW,ACPI]forceserializationofAMLmethods
acpi_skip_timer_override[HW,ACPI]
RecognizeandignoreIRQ0/pin2InterruptOverride.
ForbrokennForce2BIOSresultinginXT-PICtimer.
acpi_dbg_layer=[HW,ACPI]
Format:
Eachbitofthe
1:
enable,0:
disable.Itisusefulforboottime
debugging.Aftersystemhasbootedup,itcanbeset
via/proc/acpi/debug_layer.
acpi_dbg_level=[HW,ACPI]
Format:
Eachbitofthe
1:
enable,0:
disable.Itisusefulforboottime
debugging.Aftersystemhasbootedup,itcanbeset
via/proc/acpi/debug_level.
acpi_fake_ecdt[HW,ACPI]WorkaroundfailureduetoBIOSlackingECDT
acpi_generic_hotkey[HW,ACPI]
Allowconsolidatedgenerichotkeydriverto
overrideplatformspecificdriver.
SeealsoDocumentation/acpi-hotkey.txt.
enable_timer_pin_1[i386,x86-64]
EnablePIN1ofAPICtimer
Canbeusefultoworkaroundchipsetbugs
(inparticularonsomeATIchipsets).
Thekerneltriestosetareasonabledefault.
disable_timer_pin_1[i386,x86-64]
DisablePIN1ofAPICtimer
Canbeusefultoworkaroundchipsetbugs.
ad1816=[HW,OSS]
Format:
SeealsoDocumentation/sound/oss/AD1816.
ad1848=[HW,OSS]
Format:
adlib=[HW,OSS]
Format:
advansys=[HW,SCSI]
Seeheaderofdrivers/scsi/advansys.c.
advwdt=[HW,WDT]AdvantechWDT
Format:
aedsp16=[HW,OSS]AudioExcelDSP16
Format:
Seealsoheaderofsound/oss/aedsp16.c.
aha152x=[HW,SCSI]
SeeDocumentation/scsi/aha152x.txt.
aha1542=[HW,SCSI]
Format:
aic7xxx=[HW,SCSI]
SeeDocumentation/scsi/aic7xxx.txt.
aic79xx=[HW,SCSI]
SeeDocumentation/scsi/aic79xx.txt.
amijoy.map=[HW,JOY]Amigajoysticksupport
MapofdevicesattachedtoJOY0DATandJOY1DAT
Format:
SeealsoDocumentation/kernel/input/joystick.txt
analog.map=[HW,JOY]Analogjoystickandgamepadsupport
Specifiestypeorcapabilitiesofananalogjoystick
connectedtooneof16gameports
Format:
apc=[HW,SPARC]
Powermanagementfunctions(SPARCstation-4/5+deriv.)
Format:
noidle
DisableAPCCPUstandbysupport.SPARCstation-Foxdoes
notplaywellwithAPCCPUidle-disableitifyouhave
APCandyoursystemcrashesrandomly.
apic=[APIC,i386]Changetheoutputverbositywhilstbooting
Format:
{quiet(default)|verbose|debug}
Changetheamountofdebugginginformationoutput
wheninitialisingtheAPICandIO-APICcomponents.
apm=[APM]AdvancedPowerManagement
Seeheaderofarch/i386/kernel/apm.c.
applicom=[HW]
Format:
arcrimi=[HW,NET]ARCnet-"RIMI"(entirelymem-mapped)cards
Format:
ataflop=[HW,M68k]
atarimouse=[HW,MOUSE]AtariMouse
atascsi=[HW,SCSI]AtariSCSI
atkbd.extra=[HW]EnableextraLEDsandkeysonIBMRapidAccess,
EzKeyandsimilarkeyboards
atkbd.reset=[HW]Resetkeyboardduringinitialization
atkbd.set=[HW]Selectkeyboardcodeset
Format:
atkbd.scroll=[HW]EnablescrollwheelonMSOfficeandsimilar
keyboards
atkbd.softraw=[HW]Choosebetweensyntheticandrealrawmode
Format:
atkbd.softrepeat=[HW]
Usesoftwarekeyboardrepeat
autotest[IA64]
awe=[HW,OSS]AWE32/SB32/AWE64wavetablesynth
Format:
aztcd=[HW,CD]AztechCD268CDROMdriver
Format:
)
baycom_epp=[HW,AX25]
Format:
baycom_par=[HW,AX25]BayComParallelPortAX.25Modem
Format:
Seeheaderofdrivers/net/hamradio/baycom_par.c.
baycom_ser_fdx=[HW,AX25]
BayComSerialPortAX.25Modem(FullDuplexMode)
Format:
Seeheaderofdrivers/net/hamradio/baycom_ser_fdx.c.
baycom_ser_hdx=[HW,AX25]
BayComSerialPortAX.25Modem(HalfDuplexMode)
Format:
Seeheaderofdrivers/net/hamradio/baycom_ser_hdx.c.
blkmtd_device=[HW,MTD]
blkmtd_erasesz=
blkmtd_ro=
blkmtd_bs=
blkmtd_count=
bttv.card=[HW,V4L]bttv(bt848+bt878basedgrabbercards)
bttv.radio=Mostimportantinsmodoptionsareavailableas
kernelargstoo.
bttv.pll=SeeDocumentation/video4linu
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