ENSELDI
bus_space_write_1(iot, ioh, SIMODE0, ENSELDI | ENSELDO);
bus_space_write_1(iot, ioh, SIMODE0, ENSELDI);
ahd_outb(ahd, SIMODE0, ahd_inb(ahd, SIMODE0) | (ENSELDO|ENSELDI));
ahd_outb(ahd, SIMODE0, ahd_inb(ahd, SIMODE0) & ~(ENSELDO|ENSELDI));