Network Service of Uclinux

I tried to build a uclinux embedded system with network service.

I have already added Dm9000a Module to SOPCBuilder,

and choose the 'dm9000a' option in 'make menuconfig->device driver->networking..'

However,the startup information of uclinux is like following:

Command: ifconfig eth0 192.168.18.9 up

SIOCSIFADDR: No such device

SIOCGIFFLAGS: No such device

Command: route add default gw 192.168.18.20 eth0

route: SIOC[ADD|DEL]RT: No such device

Does anyone know how to deal with it?