udl_lookup_mode
uint8_t udl_lookup_mode(uint16_t, uint16_t, uint8_t, uint16_t,
index = udl_lookup_mode(mode.hdisplay, mode.vdisplay, mode.freq,
index = udl_lookup_mode(mode.hdisplay, mode.vdisplay,
sc->sc_cur_mode = udl_lookup_mode(800, 600, 60, sc->sc_chip, 0);