| Message ID | 1377241745-10646-1-git-send-email-josh.wu@atmel.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | Andreas Bießmann |
| Headers | show |
Dear Josh Wu, Josh Wu <Josh.wu@atmel.com> writes: >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 applied to u-boot-atmel/master, thanks! Best regards, Andreas Bießmann
Dear Bo Shen, Bo Shen <voice.shen@gmail.com> writes: >Drop unused CONFIG_NET_MULTI > >Signed-off-by: Bo Shen <voice.shen@gmail.com> > >--- >include/configs/sama5d3xek.h | 1 - > 1 file changed, 1 deletion(-) applied to u-boot-atmel/master, thanks! Best regards, Andreas Bießmann
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 96aca00..da83f06 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(
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> --- drivers/mtd/nand/atmel_nand.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)