GENET_MDIO_START_BUSY
WR4(sc, GENET_MDIO_CMD, val | GENET_MDIO_START_BUSY);
GENET_MDIO_START_BUSY) == 0) {
WR4(sc, GENET_MDIO_CMD, val | GENET_MDIO_START_BUSY);
if ((val & GENET_MDIO_START_BUSY) == 0)