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| author | Wu, Josh <Josh.wu@atmel.com> | 2013-08-23 15:09:05 +0800 |
|---|---|---|
| committer | Andreas Bießmann <andreas.devel@googlemail.com> | 2013-09-04 17:07:21 +0200 |
| commit | 1bd3e2a823e196c6f8752be87fa2379c27df2ee1 (patch) | |
| tree | 7bbcb61b336402c178f23c34a74efbf27087b86c /drivers | |
| parent | 4eef93da262048eb1118e726b3ec5b8ebd3c6c91 (diff) | |
| download | blackbird-obmc-uboot-1bd3e2a823e196c6f8752be87fa2379c27df2ee1.tar.gz blackbird-obmc-uboot-1bd3e2a823e196c6f8752be87fa2379c27df2ee1.zip | |
mtd: atmel_nand: pmecc: fix bug fail to correct bit error in 1024-bytes sector
The PMECC use BCH algorithm to correct error. In BCH algorithm, the
primitive polynomial value is GF(2^13) for 512-bytes sector size. And it is
GF(2^14) for 1024-bytes sector size.
This patch will choose correct degree of the remainders (13 or 14) for
different sector size.
Tested in AT91SAM9X5-EK with MLC nand flash.
More detail can be refered to section 5.4.1 of:
AT91SAM ARM-based Embedded MPU Application Note
<http://www.atmel.com/Images/doc11127.pdf>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/atmel_nand.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 96aca00ebc..da83f06e47 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -827,7 +827,8 @@ static int atmel_pmecc_nand_init_params(struct nand_chip *nand, switch (mtd->writesize) { case 2048: case 4096: - host->pmecc_degree = PMECC_GF_DIMENSION_13; + host->pmecc_degree = (sector_size == 512) ? + PMECC_GF_DIMENSION_13 : PMECC_GF_DIMENSION_14; host->pmecc_cw_len = (1 << host->pmecc_degree) - 1; host->pmecc_sector_number = mtd->writesize / sector_size; host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes( |
