mtd: atmel_nand: pmecc: fix bug fail to correct bit error in 1024-bytes sector
authorWu, Josh <Josh.wu@atmel.com>
Fri, 23 Aug 2013 07:09:05 +0000 (15:09 +0800)
committerAndreas Bießmann <andreas.devel@googlemail.com>
Wed, 4 Sep 2013 15:07:21 +0000 (17:07 +0200)
commit1bd3e2a823e196c6f8752be87fa2379c27df2ee1
tree7bbcb61b336402c178f23c34a74efbf27087b86c
parent4eef93da262048eb1118e726b3ec5b8ebd3c6c91
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>
drivers/mtd/nand/atmel_nand.c