tulip_mii_get_phyaddr
unsigned tulip_mii_get_phyaddr(tulip_softc_t * const sc, unsigned offset);
mi->mi_phyaddr = tulip_mii_get_phyaddr(sc, 0);
mi->mi_phyaddr = tulip_mii_get_phyaddr(sc, phyno);
mi->mi_phyaddr = tulip_mii_get_phyaddr(sc, phyno);