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DM8148上电打印C



以前使用的DM8148电路,近期焊接的几套中出现启动异常。1、串口启动,上电不打印CCC……;2、串口启动,打印CCCC……后,发送uboot.min.uart,发送完毕按任意键后没有没有运行,无任何字符输出。有没有遇到的类似情况的大神,帮忙分析下。