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关于5728开发板改为光口的问题

Other Parts Discussed in Thread: AM5728

你好,我们把5728参考板的网口修改为了光模块,请问需要做哪些配置呢?

现在我的u-boot打印信息出现这样一句话  Could not get PHY for ethernet@48484000: addr 1   

设置  setenv ipaddr 192.168.1.5  然后 ping192.168.1.5 提示 

ARP Retry count exceeded; starting again
ping failed; host 192.168.1.5 is not alive  请问哪个地方出了问题呢?谢谢