ABX8XX_OSS
if ((abcrtc_reg_read(sc, ABX8XX_OSS) & ABX8XX_OSS_OMODE) == 0 &&
(abcrtc_reg_read(sc, ABX8XX_OSS) & ABX8XX_OSS_OF) != 0)
reg = abcrtc_reg_read(sc, ABX8XX_OSS);
abcrtc_reg_write(sc, ABX8XX_OSS, reg);