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am3359 ar8031 fiber 模式,百兆可以link up,千兆死活不行 。



  目前电口的千兆已通, 光纤口百兆 mii write 0 0x1f 0x106 , 时候 mii read 0 0x11 显示 0x6400 就是link up。

而 千兆模式 uboot下 mii write 0 0x1f 0x102的时候, mii read 0  0x11 始终是0x8000

 请教一下 如何排查问题。