GENET_SYS_REV_CTRL
major = (RD4(sc, GENET_SYS_REV_CTRL) & REV_MAJOR) >> REV_MAJOR_SHIFT;
minor = (RD4(sc, GENET_SYS_REV_CTRL) & REV_MINOR) >> REV_MINOR_SHIFT;
RD4(sc, GENET_SYS_REV_CTRL) & REV_PHY);