请教关于4510B的网卡问题

richards

skyeye.conf的内容：

cpu: arm7tdmi
mach: s3c4510b
mem_bank: map=M, type=RW, addr=0x00000000, size=0x00800000
mem_bank: map=M, type=R,  addr=0x01000000, size=0x00200000, file=./images/romfs.img
#mem_bank: map=M, type=R,  addr=0x01000000, size=0x00200000
mem_bank: map=I, type=RW, addr=0x03ff0000, size=0x00100000
#uart:type=s3c4510b,name=uart0
#uart:type=s3c4510b,name=uart1
#timer:type=s3c4510b,name=timer0
#timer:type=s3c4510b,name=timer1
net: state=on, hostip=11.1.1.2, ethmod=tuntap, mac=b0:c4:20:00:00:00

启动后的错误提示：
Command: /bin/ifconfig eth0 up 11.11.11.2
eth0: unknown interface: No such device
SIOCSIFADDR: No such device
eth0: unknown interface: No such device
pid 12: failed 65280
Execution Finished, Exiting