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关于DM8127上电后打印“C”的问题

8127上电时会向串口一直打印“C”,等待UBL代码的到达;但我这里遇到一个很诡异的现象,上电后每隔一分钟才打印8个“C”。有大神碰到这样的现象么,啥原因啊?