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请教 AM335X串口没有任何输出信息,电源状态按照文档描述的排查均无异常,连串口0的'C'字符也没有输出

我按照下面这个链接去排查电源问题,排查了Power sequencing这描述的所以电源状态都没有问题,但是还是没有任何输出,这是什么原因呢?我该怎么继续排查?

http://processors.wiki.ti.com/index.php/AM335x_board_bringup_tips