CTRL_FD
sc->sc_ctrl &= ~(CTRL_SPEED_MASK | CTRL_FD);
sc->sc_ctrl |= CTRL_FD;
sc->sc_ctrl &= ~(CTRL_SPEED_MASK | CTRL_FD);
sc->sc_ctrl |= CTRL_FD;
sc->sc_ctrl = ctrl | CTRL_SLU | CTRL_FD;
sc->sc_ctrl |= CTRL_SPEED_1000 | CTRL_FRCSPD | CTRL_FD