valkyriefb_write_reg
valkyriefb_write_reg(sc, VAL_STATUS, 0);
valkyriefb_write_reg(sc, VAL_MODE, modereg | VAL_MODE_STOP);
valkyriefb_write_reg(sc, VAL_DEPTH, VAL_DEPTH_8);
valkyriefb_write_reg(sc, VAL_DEPTH, VAL_DEPTH_16);
valkyriefb_write_reg(sc, VAL_MODE, modereg);