These commands should work around various "hardware" ECC and BCH methods.
Signed-off-by: Marek Vasut <marek.va...@gmail.com>
Cc: Scott Wood <scottw...@freescale.com>
Cc: Stefano Babic <sba...@denx.de>
Cc: Wolfgang Denk <w...@denx.de>
Cc: Detlev Zundel <d...@denx.de>
---
common/cmd_nand.c | 19 +++++++++++++++++--
doc/README.nand | 9 +++++++++
2 files changed, 26 insertions(+), 2 deletions(-)
V2: Add documentation.
diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 66e06a5..72d418c 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -606,6 +606,20 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *
const argv[])
ret = nand->read_oob(nand, off, &ops);
else
ret = nand->write_oob(nand, off, &ops);
+ } else if (!strcmp(s, ".raw")) {
+ /* Raw access */
+ mtd_oob_ops_t ops = {
+ .datbuf = (u8 *)addr,
+ .oobbuf = ((u8 *)addr) + nand->writesize,
+ .len = nand->writesize,
+ .ooblen = nand->oobsize,
+ .mode = MTD_OOB_RAW
+ };
+
+ if (read)
+ ret = nand->read_oob(nand, off, &ops);
+ else
+ ret = nand->write_oob(nand, off, &ops);
} else {
printf("Unknown nand command suffix '%s'.\n", s);
return 1;
@@ -695,10 +709,11 @@ U_BOOT_CMD(
"NAND sub-system",
"info - show available NAND devices\n"
"nand device [dev] - show or set current device\n"
- "nand read - addr off|partition size\n"
- "nand write - addr off|partition size\n"
+ "nand read[.raw] - addr off|partition size\n"
+ "nand write[.raw] - addr off|partition size\n"
" read/write 'size' bytes starting at offset 'off'\n"
" to/from memory address 'addr', skipping bad blocks.\n"
+ " Use read.raw/write.raw to avoid ECC and write the block as-is.\n"
#ifdef CONFIG_CMD_NAND_TRIMFFS
"nand write.trimffs - addr off|partition size\n"
" write 'size' bytes starting at offset 'off' from memory address\n"
diff --git a/doc/README.nand b/doc/README.nand
index 751b693..084223a 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -94,6 +94,15 @@ Commands:
of data for one 512-byte page or 2 256-byte pages. There is no check
for bad blocks.
+ nand read.raw addr ofs|partition size
+ Read `size' bytes from `ofs' in NAND flash to `addr'. This reads the raw
+ block, so ECC is avoided and the OOB area is read as well.
+
+ nand write.raw addr ofs|partition size
+ Write `size' bytes from `addr' to `ofs' in NAND flash. This writes the
raw
+ block, so ECC is avoided and the OOB area is written as well, making the
+ whole block written as-is.
+
Configuration Options:
CONFIG_CMD_NAND
--
1.7.5.4
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