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1、ResearchandRealizationofIndependenceofKernelLogoFromKernelFilesBasedonLinuxYangShunsheng(WuhanUniversityofTechnology,Wuhan,China,muzishuiyi@163.com)Abstract—Atpresent,thefilesofLinuxkernellogoarecompiledintothekernelwhichmustberecompiledwhenlogoischanged.Inviewofthisphenomeno
2、n,paperanalyzeddisplayprincipleandgeneralreplacementmethodofkernellogoinembeddedCNCsystem,proposedthenewplantodisplayandrapidlyreplace,inwhichlogoisindependentofkernelfileandstoredinNANDflashdevice.Afterdesignrealizationandtest，plansuccessfullyappliedtoARMembeddedLinuxCNCsyst
3、em．Keywords—Linux;kernellogo;independence;NANDflashI.IntroductionTheidentificationofLinuxoperatingsystemisapenguin,byputtingalogofileimplementingkernelcompilation.Inembeddedsystems,Whenthelogowillchangeaccordingtotherequirements,weneedtoreplacethelogofileofcorefiles,recompile
4、theformandgetthenewkernelimagefile.Ononehand,developmentprocessbecomescomplicated,ontheotherhand,thekernelfilewithdifferentlogochange,it'sdifficulttoimplementversionofunity.Therefore,wewillputforwardanewplanofkernellogodisplayandchange.II.DESIGNSCHEMEA.Thedefaultkernellogodis
5、playprincipleStorageformatofimages,canonlybeconvertedintoanarray,thearrayisthencompiledintothekernel.Thekernelstarts,afterloadingthedisplaydrivertotheFrame-Buffer,datafromthearraytodisplay.TheLinuxkernelcurrentlysupportedPBM,PGM,PPMformatimagefiles,storedinakerneldriver/video
6、/logofiledirectory.Kernelcompilation,firstlycalltothekernelfiles/scripts/pnmtologo/pnmtologo.c.PPMimagesgeneratedinthedirectorydataarray,andstoredinthesamedirectoryofthecfunction,compiledintothekernel.Ifchangethekernelbootlogo,needtoreplacethecorrespondingpartspermillionPPMin
7、thedirectoryfile,recompilethekernel.Thedefaultkernellogodisplaysoprocessisshowninfigure1.B.ThedesignofkernellogoindependentofthekernelfileInembeddedLinuxsystem,thevariousfilesstoredintheflashonsolid-statestoragedevicesuchastheflash.Bootloaderimageisthefirstprogramofsystemonel
8、ectricperformancethatisusedtoinitializethehardwareequipment,software
