GMIIControl
CSR_WRITE_4(sc, GMIIControl, (phy << GMI_PHY_SHIFT) |
val = CSR_READ_4(sc, GMIIControl);
CSR_WRITE_4(sc, GMIIControl, (phy << GMI_PHY_SHIFT) |
val = CSR_READ_4(sc, GMIIControl);
CSR_WRITE_4(sc, GMIIControl, 0);