开机log显示关于gmac：
1.800524] sunxi gmac driver's version: 1.0.0
1.805663] gmac-power0: NULL
1.808970] gmac-power1: NULL
1.8122741 gmac-power2: NULI
只有这个四行
输入ifconfig eth0 up
显示：
[ 1928.971030] sunxi-gmac 4500000.eth eth0: eth0: Type(8) PHY ID 001cc816 at 0 IRQ poll (4500000.eth-0:00)
[ 1929.032732] sunxi-gmac 4500000.eth eth0: Initialize hardware error