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我发现AM335x在linux 系统下面，网络连接会出现问题，过一段时间之后，PC机去ping开发板，就ping不通。只有开发板ping一下主机，这样，网络双向就通了
会不会是机器休眠了呢，可以写一个socket程序，PC不停的发，AM335x不停的收，看是否会出现中断
检查下phy的配置，有的phy有休眠的功能
