IM_RX_OVRN_INT
sc->sc_intmask = IM_EPH_INT | IM_RX_OVRN_INT | IM_RCV_INT;
if (status & IM_RX_OVRN_INT) {
smc91cxx_intr_ack_write(bst, bsh, IM_RX_OVRN_INT, 0);