+ * Scan read data from data+OOB. May traverse multiple pages, interleaving
+ * page,OOB,page,OOB,... in buf. Completes transfer and returns the "strongest"
+ * ECC condition (error or bitflip). May quit on the first (non-ECC) error.
+ */
+static int scan_read_oob(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
+ size_t len)
+{
+ struct mtd_oob_ops ops;
+ int res, ret = 0;
+
+ ops.mode = MTD_OPS_PLACE_OOB;
+ ops.ooboffs = 0;
+ ops.ooblen = mtd->oobsize;
+
+ while (len > 0) {
+ ops.datbuf = buf;
+ ops.len = min(len, (size_t)mtd->writesize);
+ ops.oobbuf = buf + ops.len;
+
+ res = mtd_read_oob(mtd, offs, &ops);
+ if (res) {
+ if (!mtd_is_bitflip_or_eccerr(res))
+ return res;
+ else if (mtd_is_eccerr(res) || !ret)
+ ret = res;
+ }
+
+ buf += mtd->oobsize + mtd->writesize;
+ len -= mtd->writesize;
+ offs += mtd->writesize;
+ }
+ return ret;
+}
+
+static int scan_read(struct mtd_info *mtd, uint8_t *buf, loff_t offs,
+ size_t len, struct nand_bbt_descr *td)
+{
+ if (td->options & NAND_BBT_NO_OOB)
+ return scan_read_data(mtd, buf, offs, td);
+ else
+ return scan_read_oob(mtd, buf, offs, len);
+}
+
+/* Scan write data with oob to flash */
+static int scan_write_bbt(struct mtd_info *mtd, loff_t offs, size_t len,
+ uint8_t *buf, uint8_t *oob)
+{
+ struct mtd_oob_ops ops;
+
+ ops.mode = MTD_OPS_PLACE_OOB;
+ ops.ooboffs = 0;
+ ops.ooblen = mtd->oobsize;
+ ops.datbuf = buf;
+ ops.oobbuf = oob;
+ ops.len = len;
+
+ return mtd_write_oob(mtd, offs, &ops);
+}
+
+static u32 bbt_get_ver_offs(struct mtd_info *mtd, struct nand_bbt_descr *td)
+{
+ u32 ver_offs = td->veroffs;
+
+ if (!(td->options & NAND_BBT_NO_OOB))
+ ver_offs += mtd->writesize;
+ return ver_offs;
+}
+
+/**
+ * read_abs_bbts - [GENERIC] Read the bad block table(s) for all chips starting at a given page
+ * @mtd: MTD device structure
+ * @buf: temporary buffer
+ * @td: descriptor for the bad block table
+ * @md: descriptor for the bad block table mirror