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NAND: Add nand read.raw and write.raw commands 

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>
[scottwood@freescale.com: s/write the page/access the page/]
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Marek Vasut 2011-09-23 15:43:10 +02:00 committed by Scott Wood
parent 6d41419f0b
commit fb3659ac42
2 changed files with 28 additions and 0 deletions
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19
common/cmd_nand.c
View File

@ -598,6 +598,22 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
.mode = MTD_OOB_RAW
};
if (read)
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
};
rwsize = nand->writesize + nand->oobsize;
if (read)
ret = nand->read_oob(nand, off, &ops);
else
@ -695,6 +711,9 @@ U_BOOT_CMD(
"nand write - addr off|partition size\n"
" read/write 'size' bytes starting at offset 'off'\n"
" to/from memory address 'addr', skipping bad blocks.\n"
"nand read.raw - addr off|partition\n"
"nand write.raw - addr off|partition\n"
" Use read.raw/write.raw to avoid ECC and access the page 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"

9
doc/README.nand
View File

@ -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
Read page from `ofs' in NAND flash to `addr'. This reads the raw page,
so ECC is avoided and the OOB area is read as well.
nand write.raw addr ofs|partition
Write page from `addr' to `ofs' in NAND flash. This writes the raw page,
so ECC is avoided and the OOB area is written as well, making the whole
page written as-is.
Configuration Options:
CONFIG_CMD_NAND