The 'nandecc sw' command selects a software-based error correction
algorithm. By default, this is OMAP_ECC_HAM1_CODE_SW but some
platforms use OMAP_ECC_BCH8_CODE_HW_DETECTION_SW as their
software-based correction algorithm. Allow a user to be specific e.g.
# nandecc sw <hamming|bch8>
where 'hamming' is still the default.
Note: we don't just use CONFIG_NAND_OMAP_ECCSCHEME as it might be set
to a hardware-based ECC scheme---a little strange when the user
has requested 'sw' ECC.
Signed-off-by: Ash Charles <ashchar...@gmail.com>
---
arch/arm/cpu/armv7/omap3/board.c | 11 ++++++++++-
drivers/mtd/nand/omap_gpmc.c | 12 +++++++++++-
2 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/armv7/omap3/board.c b/arch/arm/cpu/armv7/omap3/board.c
index 667e77f..b4e29ab 100644
--- a/arch/arm/cpu/armv7/omap3/board.c
+++ b/arch/arm/cpu/armv7/omap3/board.c
@@ -327,7 +327,16 @@ static int do_switch_ecc(cmd_tbl_t * cmdtp, int flag, int
argc, char * const arg
goto usage;
}
} else if (strncmp(argv[1], "sw", 2) == 0) {
- omap_nand_switch_ecc(0, 0);
+ if (argc == 2) {
+ omap_nand_switch_ecc(0, 1);
+ } else {
+ if (strncmp(argv[2], "hamming", 7) == 0)
+ omap_nand_switch_ecc(0, 1);
+ else if (strncmp(argv[2], "bch8", 4) == 0)
+ omap_nand_switch_ecc(0, 8);
+ else
+ goto usage;
+ }
} else {
goto usage;
}
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
index db1599e..d6a28e6 100644
--- a/drivers/mtd/nand/omap_gpmc.c
+++ b/drivers/mtd/nand/omap_gpmc.c
@@ -794,8 +794,18 @@ int __maybe_unused omap_nand_switch_ecc(uint32_t hardware,
uint32_t eccstrength)
return -EINVAL;
}
} else {
- err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_SW,
+ if (eccstrength == 1) {
+ err = omap_select_ecc_scheme(nand,
+ OMAP_ECC_HAM1_CODE_SW,
+ mtd->writesize, mtd->oobsize);
+ } else if (eccstrength == 8) {
+ err = omap_select_ecc_scheme(nand,
+ OMAP_ECC_BCH8_CODE_HW_DETECTION_SW,
mtd->writesize, mtd->oobsize);
+ } else {
+ printf("nand: error: unsupported ECC scheme\n");
+ return -EINVAL;
+ }
}
/* Update NAND handling after ECC mode switch */
--
2.1.0
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