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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