udl_fb_off_write
int udl_fb_off_write(struct udl_softc *, uint16_t, uint32_t,
r = udl_fb_off_write(sc, rgb16, off, block);
(sc->udl_fb_off_write)(sc, color, i * UDL_CMD_MAX_PIXEL_COUNT,
sc->udl_fb_off_write = udl_fb_off_write;
sc->udl_fb_off_write = udl_fb_off_write_comp;
int (*udl_fb_off_write)