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I.MX6 U-Boot ping网络
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/*********************************************************************
* I.MX6 U-Boot ping网络
* 说明：
* 百兆网络是可以，千兆网络数据发送不出去，看一下U-Boot千兆网络是否
* 正常，问题同样存在。
*
* 2017-4-12 深圳 龙华民治樟坑村 曾剑锋
********************************************************************/ 操作及数据输出如下：
=> setenv etnaddr 7C:CB:E2:E0::
=> setenv ipaddr 10.10.10.10
=> setenv serverip 10.10.10.15
=> setenv gatewayip 10.10.10.1
=> setenv netmask 255.255.255.0
=> ping 10.10.10.15
Using FEC device ARP Retry count exceeded; starting again ARP Retry count exceeded; starting again
...
ARP Retry count exceeded; starting again
FEC Waiting for PHY auto negotiation to complete..... done ARP Retry count exceeded; starting again ARP Retry count exceeded; starting again ARP Retry count exceeded; starting again ARP Retry count exceeded; starting again
host 10.10.10.15 is alive
=> ping 10.10.10.15
Using FEC device
host 10.10.10.15 is alive
=> ping 10.10.10.15
Using FEC device
host 10.10.10.15 is alive
=> ping 10.10.10.15
Using FEC device
host 10.10.10.15 is alive
=> ping 10.10.10.15
Using FEC device ARP Retry count exceeded; starting again
...
