Neutrino_Startups_(no_audio)

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1、CustomizingaNeutrinoStartupModule2007/09/12R01Thispresentationisdesignedforanyoneiswhois:customizingaNeutrinoStartupModulewantingtounderstandthearchitectureofNeutrinoStartup’sBytheend,youshould:haveafeelforthestepsinvolvedincustomizingoneforaparticularhardwareplatformGo

2、als2Prerequisites:thispresentationassumesthefollowingknowledge:Clanguagegeneralassemblylanguageyouwillneedtobeveryfamiliarwiththeassemblyforyourparticularplatformthepresentationattemptstoexplaincodesnippetsinageneralwayhardwarearchitectureitmaybehelpfultounderstandvario

3、usQNXAPI’sinterruptstimingPrerequisites3Topics:OverviewoftheStartupmoduleSystemPageKernelCalloutsOverviewDebugCalloutsInterruptCalloutsCacheControlCalloutsSystemResetCalloutCalloutPatcherRoutinesRead/WriteStorageinCalloutsTimerCalloutsStartuplibraryCustomizingaStartupMo

4、dule4ORBootsequence:IPLstartupmoduleprocntobootimagescriptfurtherbootingCPUpoweronBIOSROMmonitorOverviewofStartupORBIOS,ROMMonitororIPL(InitialProgramLoader):doenoughhardwareinitializationtoloadandstarttheOSe.g.enablediskforbootingoffdisk,Ethernetfornetworkbootstartupmo

5、dule:furtherinitializeshardwareprovidesboarddependentcodeforusebyprocntoprocnto:initializesitselfandrunsbootimagescriptbootimagescriptruns:driversandotherprocesses5Pre-Startup:thestartupexpectsthattheBIOS,ROMmonitororIPLwill:initializehardware:maybeinsomeminimalway,e.g.

6、IPL,or,maybeamorethoroughinitialization,e.g.BIOSdowhateverisnecessary,togettoandload,theOS,e.g.initializememorycontrollerwithRAMrefreshratesetchipselectstoenablehardwaresuchasflashfetchOSimagefromstorage,e.g.flashserialharddisknetwork…andputintoRAM(assumingnon-XIPsystem

7、)transferexecutiontothestartupmoduleOverviewofStartup6Thestartupmodule’sjob:initializehardware:sometimesnotmuchisnecessaryMMU,timerhardware,interruptcontrollersinitializethesystempage:thesystempageisadatastructurethatcontains:avarietyoflow-levelinformationaboutthesystem

8、,e.g.systemtimerparameterssystemmemorymap/addressspaceinformationcacheconfigurationkernelcalloutstoprovideboar