[u-boot] u-boot에서 ping 체크

u-boot PING command :

board> ping [ip address]

example>

MB680> ping 111.111.111.160                             

Warning: MAC addresses don't match:
        HW MAC address:  FF:FF:FF:FF:FF:FF
        "ethaddr" value: 00:0E:2D:00:06:E5
Using MAC Address 00:0E:2D:00:06:E5
STM-GMAC: Realtek RTL8201CP found.
STM-GMAC: 100Mbs full duplex link detected
host 111.111.111.160 is alive

host 111.111.111.160 is alive 이면 정상적으로 network에 연결된 것이다.