[rom制作工具] 【rom定制教程】rom基础知识(一) [复制链接]（[rom production tools] [rom custom tutorial] rom basic knowledge [copy link]）

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1、[rom制作工具]【rom定制教程】rom基础知识(一)[复制链接]（[romproductiontools][ROMcustomtutorial]ROMbasicknowledge(1)[copylink]）[ROMproductiontools][ROMcustomtutorial]ROMbasicknowledge(1)[copylink]PostbankPostbankiscurrentlyofflinetheme3166maleUID7685integral155280posts1763644942litersofo

2、ilof161registeredmutual2010-1-30.IPcardcardpaparazziHeadContribute70655pointsUID7685Ocoin2974money,popularity1264degreesoil44942litersdownloadcoins32633registrationtime2010-1-30,finallylogin2012-6-12.Adoor,afriend,agreeting,amessagePublishedinthe2010-4-2622:42:34

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5、reverse-sharedbrowsing[ROMcustomizedtutorials]section1ROMBasicsA.Nouninterpretation1.ROM,RAM,FlashMemoryThefullnameofROM(ReadOnlyMemory)isread-onlymemory,whichistheharddiskpartofPPCforstoringandsavingdata.ROMdatacan'tbeupdatedatanytime,butitcanbereada

6、tanytime.Evenifthepowerisoff,ROMcankeepthedata.However,oncedataiswritten,itcanonlybechangedbyspecialmethodorcannotbechangedatall.Therefore,ROMoftenactsasstoragesysteminembeddedsystemThefullnameofRAM(RandomAccessMemory)istherandomstoragememory,whichisthemobilestorage

7、partofPPC,whichisusedtostoreandsavedata.Itcanreadandwriteatanytime.RAMisusuallyusedasanoperatingsystemorothertemporarystoragemediumthatisrunningaprogram(calledsystemmemory)FlashMemory,becausetheROMisnoteasytochangetoupdatetheinformationbecomesquitetroublesome,sowast

8、hedevelopmentofFlashMemory,FlashMemoryROMhasnopowertomaintainthebenefitsofdata,andcanchangethedataintimeofneed,ourcommonFLASHMemoryTFCard(fullname:TransFLash(SDcard).Fullname:SecureDigitalMemoryCard),CFcard(fullname:CompactFlash).2.XIP,IPL,SPL,RADIOXIP(ExecuteInPlac

9、e)Chinesemeaning:immediateexecution.XIPplaytheroleistorundirectlyontheFlashoperatingsystemkernel,donotneedtocopyRAM,referstotheoperatingsystemorapplicationdirectlyfromnonvolatilememory,thusreducingthekernelfromtheflashmemorytotheRAMtime,noncompressedimage,thekerneli

10、salsoreducedsincedecompressiontime,inotherwords,XIPdirectlydeterminestheoperationofPPCsystemandtheloadingtimeofprocedure,isalsodirectlydet