ip link set eth0 up

# ip link set eth0 up
[   11.774901] enter func vmac_open...
[   11.777387] enter rk30_rmii_power_control ,enable = 0 enter rk30_rmii_power_control ,enable = 1 power on phy
[   12.905791] vmac_mii_bus: probed
[   1# 905887] rk29 vmac rk29 vmac.0: PHY driver [Generic PHY] (mii_bus:phy_addr=0:00, irq=-1)
[   12.906139] ADDRCONF(NETDEV_UP): eth0: link is not ready

# [   14.897688] PHY: 0:00 - Link is Down
[   15.899894] PHY: 0:00 - Link is Up - 100/Full
[   15.900743] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:00:00:00:42
          inet6 addr: fc00::216:ff:fe00:42/64 Scope:Global
          inet6 addr: fe80::216:ff:fe00:42/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:42 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3110 (3.0 KiB)  TX bytes:316 (316.0 B)
          Interrupt:51 Base address:0x8000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)