MLX_V5_FWERROR
#define MLX_V5_GET_FWERROR(sc) bus_read_1 (sc->mlx_mem, MLX_V5_FWERROR)
#define MLX_V5_PUT_FWERROR(sc, val) bus_write_1(sc->mlx_mem, MLX_V5_FWERROR, val)