...

[    1.098960] enc28j60 spi0.0: Ethernet driver 1.02 probed
[    1.104485] enc28j60 spi0.0: Ethernet driver 1.02 loaded

....

[    4.343318] enc28j60 spi0.0 eth0: link down
Starting ntpd: [    4.354284] enc28j60 spi0.0 eth0: normal mode
[    4.359272] enc28j60 spi0.0 eth0: multicast mode
OK
[    5.292753] enc28j60 spi0.0 eth0: link up - Half duplex

...

移植之后

我的rootfs没有dhcp的软件，没法自动拿ip地址。所以我们需要配置一下buildroot。
进入目录，make menuconfig，进入
Target packages ---> Networking applications，勾上以下内容：

• dhcp
  • dhcp relay
  • dhcp client
• dhcpd
• dhcpdump
• dnsmasq
  • tftp support
  • dhcp support
• ethtool
  • enable pretty printing
• hostapd
• httping
• iptables
• iw
• lrzsz
• ntp
  • ntpd
  • ntptime
• openssh
  • client
  • server
  • key utilities
• tcpdump
• wget

再次重新上电，进入系统，输入ifconfig，非常漂亮地拿到了ip地址，不过由于校园网需要认证，目前没法访问内网和外网。

# ifconfig
eth0      Link encap:Ethernet  HWaddr 96:54:CC:C7:65:B4
          inet addr:59.66.*.*  Bcast:59.66.*.*  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:953 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:70235 (68.5 KiB)  TX bytes:3760 (3.6 KiB)
          Interrupt:67

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:128 errors:0 dropped:0 overruns:0 frame:0
          TX packets:128 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:9472 (9.2 KiB)  TX bytes:9472 (9.2 KiB)

困扰了两年的心结，从高二困扰到大一，终于解决了！