MLX_V3_FWERROR
#define MLX_V3_GET_FWERROR(sc) bus_read_1 (sc->mlx_mem, MLX_V3_FWERROR)
#define MLX_V3_PUT_FWERROR(sc, val) bus_write_1(sc->mlx_mem, MLX_V3_FWERROR, val)