GMAC_MAC_ADDRESS0_HIGH
WR4(sc, GMAC_MAC_ADDRESS0_HIGH, val);
machi = htobe16(RD4(sc, GMAC_MAC_ADDRESS0_HIGH) & 0xFFFF);
WR4(sc, GMAC_MAC_ADDRESS0_HIGH,
WR4(sc, GMAC_MAC_ADDRESS0_HIGH, machi);