an458电子信息外文资料翻译原件.pdf
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an458电子信息外文资料翻译原件.pdf
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August2010AlteraCorporationAN-458-2.0ApplicationNoteSubscribe2010AlteraCorporation.Allrightsreserved.ALTERA,ARRIA,CYCLONE,HARDCOPY,MAX,MEGACORE,NIOS,QUARTUSandSTRATIXareReg.U.S.Pat.&Tm.Off.and/ortrademarksofAlteraCorporationintheU.S.andothercountries.AllothertrademarksandservicemarksarethepropertyoftheirrespectiveholdersasdescribedatwarrantsperformanceofitssemiconductorproductstocurrentspecificationsinaccordancewithAlterasstandardwarranty,butreservestherighttomakechangestoanyproductsandservicesatanytimewithoutnotice.Alteraassumesnoresponsibilityorliabilityarisingoutoftheapplicationoruseofanyinformation,product,orservicedescribedhereinexceptasexpresslyagreedtoinwritingbyAltera.Alteracustomersareadvisedtoobtainthelatestversionofdevicespecificationsbeforerelyingonanypublishedinformationandbeforeplacingordersforproductsorservices.101InnovationDriveSanJose,CAAlternativeNiosIIBootMethodsInanystand-aloneembeddedsystemthatcontainsamicroprocessor,theprocessorrunsasmallpieceofcodecalledabootcopier,orbootloader,afterthesystemresets.Thebootcopierlocatestheappropriateapplicationsoftwareinnon-volatilememory,copiesittoRAM,initializescriticalsystemcomponents,andbranchestotheentrypointoftheapplicationsoftwareimage.Theblockofdatainnon-volatilememorythatcontainstheapplicationsoftwareiscommonlyreferredtoasthebootimage.Bootcopiersrangeincomplexityfrombasicbyte-for-bytecopyroutinestocomprehensiveapplicationsthatperformrigoroussystemtests,selectamongmultiplesoftwareapplications,andunpack,decompress,andperformerrordetectionontheproperapplication.ThisdocumentteachesyouhowtoimplementyourowncustombootcopiersoftwareusingtheNiosIIprocessorandNiosIIsoftwarebuildtools.Inaddition,thisdocumentprovidesthebasicinformationneededtoexternallycontroltheNiosIIbootprocess.ThisdocumentaddresseshowtoimplementacustombootcopierforaNiosIIprocessoralreadyconfiguredintheFPGA.ItdoesnotaddresscustommethodsofconfiguringAlteraFPGAs.fForinformationaboutcustommethodsofconfiguringAlteraFPGAs,refertotheConfigurationCenterpageoftheAlterawebsite.AssumptionsAbouttheReaderThisdocumentassumesthatyouareanadvancedNiosIIuserandthatyouarecomfortablereadingandwritingembeddedsoftware.IfyouarenotfamiliarwiththeNiosIIhardwareorsoftwaredevelopmentflow,AlterastronglyrecommendsthatyoufirstbecomefamiliarwithbuildingaNiosIImicroprocessorsystem.fForstep-by-stepproceduresthatbuildanexampleNiosIImicroprocessorsystem,refertotheNiosIIHardwareDevelopmentTutorial.ThisdocumentalsoassumesyouarefamiliarwiththecommandlineoperationoftheNiosIIflashprogrammer.fFordetailsabouttheNiosIIflashprogrammer,refertotheNiosIIFlashProgrammerUserGuide.Page2DefaultNiosIIBootCopierAlternativeNiosIIBootMethodsAugust2010AlteraCorporationImplementingaCustomBootCopierImplementingacustombootcopierrequiresyoutodeviatefromthenormalNiosIIsoftwarebuildtoolsdevelopmentflow.YoumusteditsourcefilesbyhandandrunfileconversionutilitiesfromtheNiosIIcommandshell.Thisdocumentincludesexamplesourcecodeforthefollowingtypesofcustombootcopiers:
AdvancedbootcopierIncludesextrafeaturessuchasdualbootimagesupportandCRCerrorchecking.SmallbootcopierIsabare-minimumbootcopierthatrequiresverylittlememoryspace.Thefilesreferencedinthisapplicationnoteareavailableintwo.zipfilesontheAlterawebsite.Onefilecontainsthehardwaredesignexampleandtheothercontainsthesoftwareprogramfiles.HardwareDesignFilesTheNiosIIEthernetStandardDesignExamplepageoftheAlterawebsitecontainsthehardwaredesignfilesforanumberofAlteradevelopmentboards.NavigatetothewebpageandlocatetheNiosIIEthernetStandarddesignexample.zipfilethatcorrespondstoyourboard.Downloadandunzipthefileinaprojectdirectoryofyourchoosing.Theremainderofthisapplicationnotereferstothisdirectoryas.fFormoreinformationaboutthedesignexampleandsupportedAlteradevelopmentboards,refertotheNiosIIEthernetStandardDesignExamplepageoftheAlterawebsite.SoftwareFilesThedesignfilesforAN458.zipfile(adjacenttothelinktothisdocumentontheLiterature:
NiosIIProcessorpageoftheAlterawebsite)containsthesoftwareprogramfilesandboardsupportpackage(BSP).Downloadandunzipthefileintoyourdirectory.DefaultNiosIIBootCopierThissectiondiscussestheoperationofthedefaultNiosIIbootcopier,describingtheworkingsofboththeCommonFlashInterface(CFI)flashmemoryandtheAlteraerasableprogrammableconfigurableserial(EPCS)variant.Ifyouareunfamiliarwiththedefaultbootcopier,readthissectionbef
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