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mtd: txx9ndfmc: limit transfer bytes to 512 (ECC provides 6 bytes max) 

See commit: c0cbfd0e81
Using __nand_correct_data() helper function, this driver can read 512
byte (with 6 byte ECC) at a time.

This is correct, but not more:
With NAND chips providing page sizes > 512 Bytes
chip->ecc.bytes are calculated > 6 in txx9ndfmc_nand_scan.
According the data sheet there are (only) 6 bytes ECC available.

After applying the patch a Hynix 512M*8 with 2KiB page size could be
successfully formatted and used with an ubifs file system.

Signed-off-by: Ralf Roesch <ralf.roesch@rw-gmbh.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Ralf Rösch 2010-12-30 10:30:11 +01:00 committed by David Woodhouse
parent e8953b7395
commit 24ac9a94f9
1 changed files with 3 additions and 2 deletions
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5
drivers/mtd/nand/txx9ndfmc.c
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@ -277,8 +277,9 @@ static int txx9ndfmc_nand_scan(struct mtd_info *mtd)
ret = nand_scan_ident(mtd, 1, NULL);
if (!ret) {
if (mtd->writesize >= 512) {
chip->ecc.size = mtd->writesize;
chip->ecc.bytes = 3 * (mtd->writesize / 256);
/* Hardware ECC 6 byte ECC per 512 Byte data */
chip->ecc.size = 512;
chip->ecc.bytes = 6;
}
ret = nand_scan_tail(mtd);
}