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

@@ -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"

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