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求教关于am335x系统时间乱跳



最近调试一批新的am335x板,遇到这样一个问题,启动linux后挂载上文件系统,我用date设置好系统时间,然后hwclock -w同步rtc时间,但是过一段时间后用date打印系统时间发现系统时间自动变了,rtc的时间并没有变,请问下这是什么原因啊。