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原理图如下：
和电脑连接，百兆可以调试通过，但是连接千兆的时候，显示：
PHY: 0:00 - Link is Up - 1000/Full，电脑上也显示1.0G已经连接，但是就是ping不通，求帮助！
这个您需要查查AR8031是否需要通过mdio针对千兆口进行配置。
