vic_read_cmd
u_int32_t vic_read_cmd(struct vic_softc *, u_int32_t);
sc->sc_nrxbuf = vic_read_cmd(sc, VIC_CMD_NUM_Rx_BUF);
sc->sc_ntxbuf = vic_read_cmd(sc, VIC_CMD_NUM_Tx_BUF);
sc->sc_feature = vic_read_cmd(sc, VIC_CMD_FEATURE);
sc->sc_cap = vic_read_cmd(sc, VIC_CMD_HWCAP);