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AM335X以太网问题



我用AM335X设计了一块板卡,带1路100MPHY,与电脑可以ping通,没什么问题。我生产了2块,利用两块板卡的100M以太网相互ping。设置相同的网段,但是ping不同,打印信息是

100hulf up

100hulf down

交替出现,一会连上,一会掉了。感觉好像一直在查找外部以太网设备似的。

请问需要在linux里面修改什么吗,比如把PHY芯片的自协商关闭,固定在100full模式之类的?