DC_RXLEN
sc->dc_pnic_rx_buf = kmalloc(DC_RXLEN * 5, M_DEVBUF, M_WAITOK);
c->dc_ctl = DC_RXCTL_RLINK | DC_RXLEN;
bzero(ptr, DC_RXLEN * 5);
bcopy(mtod(m, char *), ptr, DC_RXLEN);
ptr += DC_RXLEN;