Dell PowerEdge M710HD Manual do Utilizador descarregar pdf (Página 5)

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WhatUEFIhastoOffer

TheprimarygoalofUEFIistodefineanarchitecturethatcanscalewithtimeandtoofferstructuredcoding

environmentallowingeasyenablementofnewtechnology.ThemaincharacteristicsofUEFIare:

• AbstractionfortheOperation System.TheUEFIspecificationprovidesaninterfacebetweentheplatform

firmwareandthe

operatingsystem.Theinterfaces/API/protocolsmarkaclearboundarybetweenthe

firmwareandtheoperatingsystemandtheoperatingsystemloader.

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• Abstractionfordevicesandrelatedcode.UEFIabstractsinterfacesthatmakeitpossibletobuildcode

whichworksonarangeofunderlyinghardwaredeviceswithouthavingexplicitknowledge

ofthespecifics

foreachdevice.Thespecificationdefinesinterfacestoplatformcapabilitiessuchasstandardbustypes

(PCI,USB,andSCSI).Thelistofsupportedbustypesmaygrowovertime.Thesedefinedinterfacesandthe

abilitytoextendtofuturebustypesarecomponentsoftheUEFIDriver

Model.



• Scalableplatformenvironment.Thespecificationdefinesacompletesolutionforthefirmwareto

describeallplatformfeaturesandcapabilitiestotheoperatingsystemduringthebootprocess.These

definitionscoverarangeofthecontemporaryplatformdesignsbutaresimpleenoughtobeableto

extendinthe

future.



• OperatingSystemAgnosticRichPre‐Bootenvironment.TheUEFIspecificationdefinesextensible

interfacesthatenablecreationofplatformdrivers.Thedrivers,analogoustooperatingsystemdrivers,

providesupportfornewdevicesandmayprovideenhancedplatformcapabilities,suchasfirmware

update,platformconfiguration,diagnosticsanddeploymentservices.The

existenceofnetworking,USB,

andfilesystemcapabilitiesaddstotherichnessofthepre‐bootenvironment.

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• GUIDPartitionTable.TheUEFIdefinesanewstandardlayoutforthepartitiontable,knownasGUID

PartitionTable(GPT).GPTprovidesamoreflexiblemechanismforpartitioningdisksthanthe

Master

BootRecord(MBR)partitioningschemethathasbeencommontocomputers.MBRdiskssupportonly

fourpartitiontableentriesandthepartitionsizeislimitedto2TB.GPTschemeallowsupto128primary

partitionsandcansupportlargerthan2‐terabytepartitions.Somenear‐termlimitationsto2terabyte

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supportexistduetodevicesupport,butoncedevicesfullysupportGPT/UEFI,thiswillnolongerbean

issue.Seethe“Limitations”section.

HowisDell’sUEFIimplemented?

TosupportbootingtobothUEFIandnon‐UEFIawareoperatingsystems,theDellBIOSsupportsaBootMode

optionintheBIOSSetupUtility.TheBootModecanbesettoBIOSorUEFI.

SettingtheBootModetoUEFIallowsbootingtoaUEFI‐awareoperatingsystemandprovides

theUEFIBoot

Manager.ThisistheonlychangerequiredtoenableUEFIonthesystem.SettingtheBootModetoBIOSprovides

supportforallcurrentandlegacyoperationsystems.

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