/********************************************************************* *                       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:E0:28:07    => 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    ...