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AM335x eMMC无法启动

硬件电路参照BeagleBone-Black,软件基于TI SDK6.0,从eMMC启动,之前测试五块板子都是正常的,今天测试有一块板子eMMC无法启动,串口打印“CCCCC”,但插上TF卡启动是正常的,进入系统后挂载eMMC、拷贝文件都是正常的,可能是什么原因导致的?