在20130327 android4.0在tiny210
网络终端执行 ifconfig eth0 down关网络后，在执行 ifconfig eth0 up开启网络，网络无法获取ip地址，无论重启还是开关机开发板都无法获取ip地址，网络指示灯闪烁，网络也无法连通....
/ # ifconfig eth0 down
/ # ifconfig eth0 up
[ 287.463363] dm9000 dm9000: eth0: link down
[ 287.465650] ADDRCONF(NETDEV_UP): eth0: link is not ready
/ # [ 287.713149] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 287.720999] dm9000 dm9000: eth0: link up, 100Mbps, full-duplex, lpa 0xC5E1
/ # netcfg
lo UP 127.0.0.1/8 0x00000049 00:00:00:00:00:00
ifb0 DOWN 0.0.0.0/0 0x00000082 0e:3d:e9:d2:0c:da
ifb1 DOWN 0.0.0.0/0 0x00000082 9e:ef:4b:35:57:d2
eth0 UP 0.0.0.0/0 0x00001043 08:90:00:a0:02:10
sit0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
ip6tnl0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
/ #
