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BeagleBone Black 串口无法工作



您好!BeagleBone Black 的UART1、UART2、UART4用Minicom打开都显示|Offline,且无法接收数据不工作,查看结果如图

UART0是正常工作的,cat $SLOTS后没有反应,需要强制退出,不知道怎么才能解决这个问题?