From fb3659ac422801ea18f36ef62926df70beeada4c Mon Sep 17 00:00:00 2001
From: Marek Vasut <marek.vasut@gmail.com>
Date: Fri, 23 Sep 2011 15:43:10 +0200
Subject: [PATCH] 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>
---
common/cmd_nand.c | 19 +++++++++++++++++++
doc/README.nand | 9 +++++++++
2 files changed, 28 insertions(+)
diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 6edca7607f6..1a67e4d81f5 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -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"
diff --git a/doc/README.nand b/doc/README.nand
index 751b6938435..023740e1d36 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
--
GitLab