These commands should work around various "hardware" ECC and BCH methods.
Signed-off-by: Marek Vasut marek.vasut@gmail.com Cc: Scott Wood scottwood@freescale.com Cc: Stefano Babic sbabic@denx.de Cc: Wolfgang Denk wd@denx.de Cc: Detlev Zundel dzu@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