Kylix Which one device node in NetBSD is equal to /dev/cuaU1 in FreeBSD?
I don't have any serial-port HW, so I'm guessing here, but, going by the tty(4) man-page, I would try: /dev/tty00, /dev/ttyU0, /dev/dty00, /dev/dtyU0 and similar higher-numbered devices.
A dmesg output from your system should tell us if the controller was configured OK.