ubi_attach_mtd_dev
err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0, false, false);
err = ubi_attach_mtd_dev(mtd, p->ubi_num,
err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,