alc_miidbg_readreg
val = alc_miidbg_readreg(sc, MII_DBG_GREENCFG2);
val = alc_miidbg_readreg(sc, MII_DBG_GREENCFG2);
static uint32_t alc_miidbg_readreg(struct alc_softc *, int);
agc = alc_miidbg_readreg(sc, MII_DBG_AGC);
val = alc_miidbg_readreg(sc, MII_DBG_MSE20DB);
val = alc_miidbg_readreg(sc, MII_DBG_MSE20DB);