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am335x通过sd卡烧写程序却无法烧进去emmc

am335x通过sd卡烧写程序,在串口中一直有在烧写并打印全部信息,包括升级库等等,前前后后烧写了十多分钟,但是在这过程中用示波器看emmc的波形,完全没有,sd卡信号一直有,烧写成功后,拔掉sd卡,重新上电,串口一直打印cccccccccc,请问这种情况是什么原因导致,怎么解决!!!

emmc没有波形,但是sd卡有信号,并且串口一直有在打印烧写进程,是什么情况?