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authorAnton Vorontsov <avorontsov@ru.mvista.com>2008-06-27 23:04:04 +0400
committerScott Wood <scottwood@freescale.com>2008-09-12 14:56:03 -0500
commit97ae023648e764f794ffb9c52da109d6caf09c47 (patch)
tree87533cb3d34a8f13d11cd5fa7b31f95f9283cf84
parent6644641d072aee3087da129d8443187196a4d8a9 (diff)
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fsl_elbc_nand: fix OOB workability for large page NAND chips
For large page chips, nand_bbt is looking into OOB area, and checking for "0xff 0xff" pattern at OOB offset 0. That is, two bytes should be reserved for bbt means. But ELBC driver is specifying ecclayout so that oobfree area starts at offset 1, so only one byte left for the bbt purposes. This causes problems with any OOB users, namely JFFS2: after first mount JFFS2 will fill all OOBs with "erased marker", so OOBs will contain: OOB Data: ff 19 85 20 03 00 ff ff ff 00 00 08 ff ff ff ff OOB Data: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff OOB Data: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff OOB Data: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff And on the next boot, NAND core will rescan for bad blocks, then will see "0xff 0x19" pattern, and will mark all blocks as bad ones. To fix the issue we should implement our own bad block pattern: just one byte at OOB start. Though, this will work only for x8 chips. For x16 chips two bytes must be checked. Since ELBC driver does not support x16 NANDs (yet), we're safe for now. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Scott Wood <scottwood@freescale.com>
-rw-r--r--drivers/mtd/nand/fsl_elbc_nand.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 674c542..b8bc143 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -122,6 +122,20 @@ static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
.oobavail = 48,
};
+/*
+ * fsl_elbc_oob_lp_eccm* specify that LP NAND's OOB free area starts at offset
+ * 1, so we have to adjust bad block pattern. This pattern should be used for
+ * x8 chips only. So far hardware does not support x16 chips anyway.
+ */
+static u8 scan_ff_pattern[] = { 0xff, };
+
+static struct nand_bbt_descr largepage_memorybased = {
+ .options = 0,
+ .offs = 0,
+ .len = 1,
+ .pattern = scan_ff_pattern,
+};
+
/*=================================*/
/*
@@ -750,9 +764,10 @@ int board_nand_init(struct nand_chip *nand)
priv->fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT);
- /* adjust Option Register and ECC to match Flash page size */
+ /* Large-page-specific setup */
if (or & OR_FCM_PGS) {
priv->page_size = 1;
+ nand->badblock_pattern = &largepage_memorybased;
/* adjust ecc setup if needed */
if ((br & BR_DECC) == BR_DECC_CHK_GEN) {