ESMT_OOB_SECTION_SIZE
(ESMT_OOB_SECTION_SIZE(nand) / 2)
(ESMT_OOB_SECTION_SIZE(nand) - ESMT_OOB_FREE_SIZE(nand))
region->offset = section * ESMT_OOB_SECTION_SIZE(nand) +
region->offset = section * ESMT_OOB_SECTION_SIZE(nand) + 2;