IMX_UCR2_CTS
ucr2_mask = IMX_UCR2_CTS;
ucr2 = (sc->sc_ucr2 & ~IMX_UCR2_CTS) |
(ucr2 & IMX_UCR2_CTS);
if (ISSET(sc->sc_ucr2, IMX_UCR2_CTS))
IMX_UCR2_CTS;