[U-Boot] [PATCH 2/5 V2] NAND: Add nand read.raw and write.raw commands

[Marek Vasut <marek.vasut@gmail.com>]

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
-- 
1.7.5.4