CRTC_DATA
val = bus_space_read_1(fb->iot, fb->ioh, CRTC_DATA);
bus_space_write_1(fb->iot, fb->ioh, CRTC_DATA, val);
bus_space_write_1(sc->sc_ioregt, sc->sc_ioregh, CRTC_DATA - 0x300, val);
mgx_write_vga(sc, CRTC_DATA, stride & 0xff);
mgx_write_vga(sc, CRTC_DATA, (stride & 0xf00) >> 4);