GM_PHY_ADDR
gmac = GMAC_READ_2(sc, sc_if->msk_port, GM_PHY_ADDR);
GMAC_WRITE_2(sc, sc_if->msk_port, GM_PHY_ADDR, gmac | GM_PAR_MIB_CLR);
GMAC_WRITE_2(sc, sc_if->msk_port, GM_PHY_ADDR, gmac);
gmac = GMAC_READ_2(sc, sc_if->msk_port, GM_PHY_ADDR);
GMAC_WRITE_2(sc, sc_if->msk_port, GM_PHY_ADDR, gmac | GM_PAR_MIB_CLR);
GMAC_WRITE_2(sc, sc_if->msk_port, GM_PHY_ADDR, gmac);