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dp83640接phy link灯不亮

Other Parts Discussed in Thread: DP83640

CPU为am335x,starterware,网口芯片为dp83640,

板子接电脑时,网口可正常通信,收发数据,但是两个板子对接时,网口led-link灯不亮,

各位大神,是否知道哪里配置有误?谢谢。