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| author | pekon gupta <pekon@ti.com> | 2013-11-18 19:03:01 +0530 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2013-11-21 13:33:41 -0600 |
| commit | 3f719069c884284b2457448a7afe32b02bd4f782 (patch) | |
| tree | ebcbf9a507b4079b6c1842503f3fd1233bfb066d /include/configs/am335x_evm.h | |
| parent | d016dc42cedbf6102e100fa9ecb58462edfb14f8 (diff) | |
| download | talos-obmc-uboot-3f719069c884284b2457448a7afe32b02bd4f782.tar.gz talos-obmc-uboot-3f719069c884284b2457448a7afe32b02bd4f782.zip | |
mtd: nand: omap: add CONFIG_NAND_OMAP_ECCSCHEME for selection of ecc-scheme
This patch adds new CONFIG_NAND_OMAP_ECCSCHEME, replacing other distributed
CONFIG_xx used for selecting NAND ecc-schemes.
This patch aims at solving following issues.
1) Currently ecc-scheme is tied to SoC platform, which prevents user to select
other ecc-schemes also supported in hardware. like;
- most of OMAP3 SoC platforms use only 1-bit Hamming ecc-scheme, inspite
the fact that they can use higher ecc-schemes like 8-bit ecc-schemes with
software based error detection (OMAP_ECC_BCH4_CODE_HW_DETECTION_SW).
- most of AM33xx SoC plaforms use 8-bit BCH ecc-scheme for now, but hardware
supports BCH16 ecc-scheme also.
2) Different platforms use different CONFIG_xx to select ecc-schemes, which
adds confusion for user while migrating platforms.
- *CONFIG_NAND_OMAP_ELM* which enables ELM hardware engine, selects only
8-bit BCH ecc-scheme with h/w based error-correction (OMAP_ECC_BCH8_CODE_HW)
whereas ELM hardware engine supports other ecc-schemes also like; BCH4,
and BCH16 (in future).
- *CONFIG_NAND_OMAP_BCH8* selects 8-bit BCH ecc-scheme with s/w based error
correction (OMAP_ECC_BCH8_CODE_HW_DETECTION_SW).
- *CONFIG_SPL_NAND_SOFTECC* selects 1-bit Hamming ecc-scheme using s/w library
Thus adding new *CONFIG_NAND_OMAP_ECCSCHEME* de-couples ecc-scheme dependency
on SoC platform and NAND driver. And user can select ecc-scheme independently
foreach board.
However, selection some hardware based ecc-schemes (OMAP_ECC_BCHx_CODE_HW) still
depends on presence of ELM hardware engine on SoC. (Refer doc/README.nand)
Signed-off-by: Pekon Gupta <pekon@ti.com>
Diffstat (limited to 'include/configs/am335x_evm.h')
| -rw-r--r-- | include/configs/am335x_evm.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/configs/am335x_evm.h b/include/configs/am335x_evm.h index 73d8b4dfba..1d5916753d 100644 --- a/include/configs/am335x_evm.h +++ b/include/configs/am335x_evm.h @@ -240,7 +240,8 @@ #define CONFIG_SYS_NAND_ECCSIZE 512 #define CONFIG_SYS_NAND_ECCBYTES 14 - +#define CONFIG_SYS_NAND_ONFI_DETECTION +#define CONFIG_NAND_OMAP_ECCSCHEME OMAP_ECC_BCH8_CODE_HW #define CONFIG_SYS_NAND_U_BOOT_START CONFIG_SYS_TEXT_BASE #define CONFIG_SYS_NAND_U_BOOT_OFFS 0x80000 #endif |
