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28335 外扩FLASH

现在做个系统要用到28335,考虑到以后软件要升级,担心片内FLASH 不够用,打算用SPI外扩FLASH,上电后从外部SPI启动!现在有点疑问,如何对外扩FLASH编程呢?就是完成程序后,如何将程序固化到FLASH中去。TI提供的JTAG是针对片上FLASH编程的,还有第三方的SDFLASH,都没有提到外扩的FLASH怎样编程!求教!