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| author | Peng Fan <Peng.Fan@freescale.com> | 2015-07-21 16:15:19 +0800 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-08-25 22:53:58 -0500 |
| commit | 63b29d80823be9ce7763cadc115012d0fba69700 (patch) | |
| tree | 9ea8dd919906f66718739b70c5b6e2a93441ac71 /arch/arm/include/asm/imx-common | |
| parent | d6b6303dbe00f99d105f1d4479f6ea60434861c1 (diff) | |
| download | talos-obmc-uboot-63b29d80823be9ce7763cadc115012d0fba69700.tar.gz talos-obmc-uboot-63b29d80823be9ce7763cadc115012d0fba69700.zip | |
mtd: nand: mxs support oobsize bigger than 512
If ecc chunk data size is 512 and oobsize is bigger than 512, there is
a chance that block_mark_bit_offset conflicts with bch ecc area.
The following graph is modified from kernel gpmi-nand.c driver with
each data block 512 bytes. We can see that Block Mark conflicts with
ecc area from bch view. We can enlarge the ecc chunk size to avoid
this problem to those oobsize which is larger than 512.
| P |
|<----------------------------------------------------------------->|
| |
| (Block Mark) |
| P' | | | |
|<--------------------------------------------------->| D | | O'|
| |<--------->| |<->|
V V V V V
+---+--------------+-+--------------+-+--------------+-+----------+-+---+
| M | data |E| data |E| data |E| data |E| |
+---+--------------+-+--------------+-+--------------+-+----------+-+---+
^ ^
| O |
|<---------------->|
P : the page size for BCH module.
E : The ECC strength.
G : the length of Galois Field.
N : The chunk count of per page.
M : the metasize of per page.
C : the ecc chunk size, aka the "data" above.
P': the nand chip's page size.
O : the nand chip's oob size.
O': the free oob.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Tested-By: Tim Harvey <tharvey@gateworks.com>
Diffstat (limited to 'arch/arm/include/asm/imx-common')
| -rw-r--r-- | arch/arm/include/asm/imx-common/regs-bch.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/include/asm/imx-common/regs-bch.h b/arch/arm/include/asm/imx-common/regs-bch.h index a33d3419b9..5c477835fc 100644 --- a/arch/arm/include/asm/imx-common/regs-bch.h +++ b/arch/arm/include/asm/imx-common/regs-bch.h @@ -148,6 +148,7 @@ struct mxs_bch_regs { #define BCH_FLASHLAYOUT0_ECC0_ECC30 (0xf << 12) #define BCH_FLASHLAYOUT0_ECC0_ECC32 (0x10 << 12) #define BCH_FLASHLAYOUT0_GF13_0_GF14_1 (1 << 10) +#define BCH_FLASHLAYOUT0_GF13_0_GF14_1_OFFSET 10 #define BCH_FLASHLAYOUT0_DATA0_SIZE_MASK 0xfff #define BCH_FLASHLAYOUT0_DATA0_SIZE_OFFSET 0 @@ -178,6 +179,7 @@ struct mxs_bch_regs { #define BCH_FLASHLAYOUT1_ECCN_ECC30 (0xf << 12) #define BCH_FLASHLAYOUT1_ECCN_ECC32 (0x10 << 12) #define BCH_FLASHLAYOUT1_GF13_0_GF14_1 (1 << 10) +#define BCH_FLASHLAYOUT1_GF13_0_GF14_1_OFFSET 10 #define BCH_FLASHLAYOUT1_DATAN_SIZE_MASK 0xfff #define BCH_FLASHLAYOUT1_DATAN_SIZE_OFFSET 0 |
