CTRL_FRCSPD
sc->sc_ctrl |= CTRL_FRCSPD | CTRL_FRCFDX;
sc->sc_ctrl &= ~(CTRL_FRCSPD | CTRL_FRCFDX);
sc->sc_ctrl |= CTRL_FRCSPD | CTRL_FRCFDX;
sc->sc_ctrl |= CTRL_SPEED_1000 | CTRL_FRCSPD | CTRL_FD
tmp |= CTRL_FRCSPD;