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am3352 + TPS65217 上电全部电源均正常,ARM无CCCCC打印

基本电路采用bbb板方案,启动方式包含uart,上电后各个电源轨电压正常 。电流只有86ma,串口0 无任何输出,且串口 0 tx rx 始终被拉高。确认过供电电路,应该没问题。请问改如何排查,有什么好的建议?