nand_region_is_secured
if (nand_region_is_secured(chip, ofs, mtd->erasesize))
if (nand_region_is_secured(chip, from, readlen))
if (nand_region_is_secured(chip, from, readlen))
if (nand_region_is_secured(chip, to, writelen))
if (nand_region_is_secured(chip, to, ops->ooblen))
if (nand_region_is_secured(chip, instr->addr, instr->len))