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TMS320C5535: flash启动时,DMA无法读写SD卡

Part Number: TMS320C5535

您好,在TMS320C5535处理器上,用DMA进行MMCSD读写的时候遇到一个问题,问题是:程序用下载器在线运行时可正常读写SD卡,当程序转化成.bin文件烧到flash里后启动,程序无法读写SD卡,其他串口通讯等功能正常,请问可能的原因是什么呢?能否提供解决方法?谢谢!