[U-Boot] [PATCH 2/5 V4] NAND: Add nand read.raw and write.raw commands

Marek Vasut
2011-09-23T13:43:10Z

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, 28 insertions(+), 0 deletions(-)

V2: Add documentation.
V3: Drop size param.
V4: Dont drop size of read/write commands, operate on pages

diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 66e06a5..14c7c09 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -606,6 +606,22 @@ 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
+ };
+
+ rwsize = nand->writesize + nand->oobsize;
+
+ 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;
@@ -699,6 +715,9 @@ 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 write 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"
diff --git a/doc/README.nand b/doc/README.nand
index 751b693..023740e 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
+ 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
--
1.7.5.4