Using QEMU for Embedded Systems Development, Part 2 - LINUX For You.pdf

Using QEMU for Embedded Systems Development, Part 2 - LINUX For You.pdf

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1、WriteForUsSubmitTipsSubscribetoPrintEditionSearchHOMEREVIEWSHOW-TOSCODINGINTERVIEWSFEATURESOVERVIEWBLOGSSERIESITADMINUsingQEMUforEmbeddedSystemsSearchfor:SearchDevelopment,Part2ByManojKumaronJuly1,2011inCoding,Developers·3Commentsand0ReactionsGetConnectedInthepreviousarticles,weRSSFeedTwitterlearnth

2、owtouseQEMUforagenericLinuxOSinstallation,fornetworkingusingOpenVPNandTAP/TUN,forcross-compilationoftheLinuxkernelforARM,tobootthekernelfromQEMU,andhowtobuildasmallfilesystemandthenmountitonthevanillakernel.Nowwewillstepoutfurther.Firstofall,Iwouldliketoexplaintheneedforabootloader.Thebootloaderisco

3、dethatisusedtoloadthekernelintoRAM,andthenspecifywhichpartitionwillbemountedastherootfilesystem.ThebootloaderresidesintheMBR(MasterBootRecord).Ingeneral-purposecomputingmachines,animportantcomponentistheBIOS(BasicInputOutputSystem).TheBIOScontainsthelow-leveldriversfordeviceslikethekeyboard,mouse,di

4、splay,etc.Itinitiatesthebootloader,whichthenloadsthekernel.Linuxusersareveryfamiliarwithboot-loaderslikeGRUB(GrandUnifiedBoot-Loader)andLILO(LinuxLoader).Micro-controllerprogrammersareveryfamiliarwiththeterm“Bare-MetalProgramming”.Itmeansthatthereisnothingbetweenyourprogramandtheprocessor—thecodeyou

5、writerunsdirectlyontheprocessor.Itbecomestheprogrammer’sresponsibilitytocheckeachandeverypossibleconditionthatcancorruptthesystem.Now,letusbuildasmallprogramfortheARMVersatilePlatformBaseboard,whichwillrunontheQEMUemulator,andthenprintamessageontheserialconsole.Downloadedthetool-chainforARMEABIfromh

6、ere.Asdescribedinthepreviousarticle,addthistool-chaininyourPATH.Bydefault,QEMUredirectstheserialconsoleoutputtotheterminal,whenitisinitialisedwiththenographicoption:$qemu-system-arm--help

7、grepnographic-nographicdisablegraphicaloutputandredirectserialI/Ostoconsole.Whenusing-nographic,press'ctrl-ah'to

8、getsomehelp.Wecanmakegooduseofthisfeature;let’swritesomedatatotheserialport,anditcanbeagoodworkingexample.Beforegoingfurther,wemustmakesurewhichprocessortheGNUEABItool-chainsupports,andwhichprocessorQ

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