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AM5728从SD卡不能加载系统

Other Parts Discussed in Thread: AM5728

你好,我自己设计的AM5728,按照上电时序测量了RSTOUT信号正常变高,然后配置成SD卡启动系统,串口没有任何打印的信息。切换到从串口启动之后,AM5728会往外面发送波形,是不是可以说明AM5728最小的硬件系统是OK 了。另外 SD卡的启动文件是从一个开发板上面直接移植的,从开发板上可以正常启动,在我自己设计的板子上不能启动,请问是哪里会引起这样的问题 谢谢