>>>#define RTEMS_BSP_NETWORK_DRIVER_NAME "dc1" >> extern int >>rtems_dec21140_driver_attach(struct rtems_bsdnet_ifconfig *); >>#define RTEMS_BSP_NETWORK_DRIVER_ATTACH rtems_dec21140_driver_attach Those lines got the network up. Except I had to tweak dec21140.c so it also recognised my dec21143 correctly.