[PATCH 4/4] mtd: spinand: enable erasing of bad mtd blocks

Mikhail Kshevetskiy mikhail.kshevetskiy at oktetlabs.ru
Mon Jun 22 15:16:34 CEST 2020


U-Boot is able to erase bad mtd blocks on raw nand devices, but this
is not true for spinand flashes. Lets enable this feature for spinand
flashes as well. This is extemelly useful for flash testing.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at oktetlabs.ru>
---
 drivers/mtd/nand/core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/core.c b/drivers/mtd/nand/core.c
index 6fbd24ba74..a39b4c4b30 100644
--- a/drivers/mtd/nand/core.c
+++ b/drivers/mtd/nand/core.c
@@ -130,10 +130,18 @@ EXPORT_SYMBOL_GPL(nanddev_isreserved);
  */
 int nanddev_erase(struct nand_device *nand, const struct nand_pos *pos)
 {
+	unsigned int entry;
+
 	if (nanddev_isbad(nand, pos) || nanddev_isreserved(nand, pos)) {
 		pr_warn("attempt to erase a bad/reserved block @%llx\n",
 			nanddev_pos_to_offs(nand, pos));
-		return -EIO;
+		if (nanddev_isreserved(nand, pos))
+			return -EIO;
+
+		/* remove bad block from BBT */
+		entry = nanddev_bbt_pos_to_entry(nand, pos);
+		nanddev_bbt_set_block_status(nand, entry,
+					     NAND_BBT_BLOCK_STATUS_UNKNOWN);
 	}
 
 	return nand->ops->erase(nand, pos);
-- 
2.27.0



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