CHNCTL_HW_FLOW    440 dev/pci/cz.c   		CZTTY_CHAN_WRITE(sc, CHNCTL_HW_FLOW, C_RS_CTS | C_RS_RTS);
CHNCTL_HW_FLOW   1446 dev/pci/cz.c   	CZTTY_CHAN_WRITE(sc, CHNCTL_HW_FLOW, sc->sc_chanctl_hw_flow);