BITBUCKET
bus_space_write_1(iot, ioh, SXFRCTL1, BITBUCKET);
bus_space_write_1(iot, ioh, SXFRCTL1, BITBUCKET);
ahd_outb(ahd, SXFRCTL1, ahd_inb(ahd, SXFRCTL1) & ~BITBUCKET);
ahc_outb(ahc, SXFRCTL1, ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);
ahc_inb(ahc, SXFRCTL1) | BITBUCKET);
ahc_inb(ahc, SXFRCTL1) & ~BITBUCKET);