GENET_MDIO_START_BUSY
GENET_MDIO_READ | GENET_MDIO_START_BUSY |
if ((RD4(sc, GENET_MDIO_CMD) & GENET_MDIO_START_BUSY) == 0)
val | GENET_MDIO_WRITE | GENET_MDIO_START_BUSY |
if ((RD4(sc, GENET_MDIO_CMD) & GENET_MDIO_START_BUSY) == 0)