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| author | pekon gupta <pekon@ti.com> | 2013-12-05 17:54:21 +0530 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2013-12-17 17:28:41 -0600 |
| commit | 69cc97f8dbf898d732fbd04852cf1068aeb991ba (patch) | |
| tree | 2168a666eb41138ab37901b55437713917efdd87 /drivers/mtd | |
| parent | fd44194945714a478fab6407c04453caaef0bac9 (diff) | |
| download | blackbird-obmc-uboot-69cc97f8dbf898d732fbd04852cf1068aeb991ba.tar.gz blackbird-obmc-uboot-69cc97f8dbf898d732fbd04852cf1068aeb991ba.zip | |
mtd: nand: omap: fix ecc-layout for HAM1 ecc-scheme
As per OMAP3530 TRM referenced below [1]
For large-page NAND, ROM code expects following ecc-layout for HAM1 ecc-scheme
- OOB[1] (offset of 1 *byte* from start of OOB) for x8 NAND device
- OOB[2] (offset of 1 *word* from start of OOB) for x16 NAND device
Thus ecc-layout expected by ROM code for HAM1 ecc-scheme is:
*for x8 NAND Device*
+--------+---------+---------+---------+---------+---------+---------+
| xxxx | ECC[A0] | ECC[A1] | ECC[A2] | ECC[B0] | ECC[B1] | ECC[B2] | ...
+--------+---------+---------+---------+---------+---------+---------+
*for x16 NAND Device*
+--------+--------+---------+---------+---------+---------+---------+---------+
| xxxxx | xxxxx | ECC[A0] | ECC[A1] | ECC[A2] | ECC[B0] | ECC[B1] | ECC[B2] |
+--------+--------+---------+---------+---------+---------+---------+---------+
This patch fixes ecc-layout *only* for HAM1, as required by ROM-code
For other ecc-schemes like (BCH8) ecc-layout is same for x8 or x16 devices.
[1] OMAP3530: http://www.ti.com/product/omap3530
TRM: http://www.ti.com/litv/pdf/spruf98x
Chapter-25: Initialization Sub-topic: Memory Booting
Section: 25.4.7.4 NAND
Figure 25-19. ECC Locations in NAND Spare Areas
Reported-by: Stefan Roese <sr@denx.de>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Tested-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/omap_gpmc.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index 5e7e6b3375..23a961c9d4 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -798,8 +798,12 @@ static int omap_select_ecc_scheme(struct nand_chip *nand, nand->ecc.calculate = omap_calculate_ecc; /* define ecc-layout */ ecclayout->eccbytes = nand->ecc.bytes * eccsteps; - for (i = 0; i < ecclayout->eccbytes; i++) - ecclayout->eccpos[i] = i + BADBLOCK_MARKER_LENGTH; + for (i = 0; i < ecclayout->eccbytes; i++) { + if (nand->options & NAND_BUSWIDTH_16) + ecclayout->eccpos[i] = i + 2; + else + ecclayout->eccpos[i] = i + 1; + } ecclayout->oobfree[0].offset = i + BADBLOCK_MARKER_LENGTH; ecclayout->oobfree[0].length = oobsize - ecclayout->eccbytes - BADBLOCK_MARKER_LENGTH; |
