* Several improvements to the new NAND subsystem:

  - JFFS2 related commands implemented in mtd-utils style
  - Support for bad blocks
  - Bad block testing commands
  - NAND lock commands
  Please take a look at doc/README.nand for more details
  Patch by Guido Classen, 10 Oct 2006

7 files changed, 1183 insertions, 27 deletions

diff --git a/CHANGELOG b/CHANGELOG
index a2ea35d..9ed65bd 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,14 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Several improvements to the new NAND subsystem:
+  - JFFS2 related commands implemented in mtd-utils style
+  - Support for bad blocks
+  - Bad block testing commands
+  - NAND lock commands
+  Please take a look at doc/README.nand for more details
+  Patch by Guido Classen, 10 Oct 2006
+
 * Define IH_CPU_AVR32
   Make it possible to generate AVR32 uImage files with mkimage and
   make cmd_bootm recognize them.
diff --git a/common/cmd_nand.c b/common/cmd_nand.c
index 21adb1b..274ef0b 100644
--- a/common/cmd_nand.c
+++ b/common/cmd_nand.c
@@ -135,11 +135,16 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 	ulong addr, off, size;
 	char *cmd, *s;
 	nand_info_t *nand;
+	int quiet = 0;
+	const char *quiet_str = getenv("quiet");
 
 	/* at least two arguments please */
 	if (argc < 2)
 		goto usage;
 
+	if (quiet_str)
+		quiet = simple_strtoul(quiet_str, NULL, 0) != 0;
+
 	cmd = argv[1];
 
 	if (strcmp(cmd, "info") == 0) {
@@ -178,7 +183,10 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 
 	if (strcmp(cmd, "bad") != 0 && strcmp(cmd, "erase") != 0 &&
 	    strncmp(cmd, "dump", 4) != 0 &&
-	    strncmp(cmd, "read", 4) != 0 && strncmp(cmd, "write", 5) != 0)
+	    strncmp(cmd, "read", 4) != 0 && strncmp(cmd, "write", 5) != 0 &&
+	    strcmp(cmd, "scrub") != 0 && strcmp(cmd, "markbad") != 0 &&
+	    strcmp(cmd, "biterr") != 0 &&
+	    strcmp(cmd, "lock") != 0 && strcmp(cmd, "unlock") != 0 )
 		goto usage;
 
 	/* the following commands operate on the current device */
@@ -197,14 +205,64 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 		return 0;
 	}
 
-	if (strcmp(cmd, "erase") == 0) {
-		arg_off_size(argc - 2, argv + 2, &off, &size, nand->size);
-		if (off == 0 && size == 0)
-			return 1;
+	if (strcmp(cmd, "erase") == 0 || strcmp(cmd, "scrub") == 0) {
+		nand_erase_options_t opts;
+		int clean = argc >= 3 && !strcmp("clean", argv[2]);
+		int rest_argc = argc - 2;
+		char **rest_argv = argv + 2;
+		int scrub = !strcmp(cmd, "scrub");
+
+		if (clean) {
+			rest_argc--;
+			rest_argv++;
+		}
+
+		if (rest_argc == 0) {
 
-		printf("\nNAND erase: device %d offset 0x%x, size 0x%x ",
-		       nand_curr_device, off, size);
-		ret = nand_erase(nand, off, size);
+			printf("\nNAND %s: device %d whole chip\n",
+			       cmd,
+			       nand_curr_device);
+
+			off = size = 0;
+		} else {
+			arg_off_size(rest_argc, rest_argv, &off, &size,
+				     nand->size);
+
+			if (off == 0 && size == 0)
+				return 1;
+
+			printf("\nNAND %s: device %d offset 0x%x, size 0x%x\n",
+			       cmd, nand_curr_device, off, size);
+		}
+
+		memset(&opts, 0, sizeof(opts));
+		opts.offset = off;
+		opts.length = size;
+		opts.jffs2  = clean;
+		opts.quiet  = quiet;
+
+		if (scrub) {
+			printf("Warning: "
+			       "scrub option will erase all factory set "
+			       "bad blocks!\n"
+			       "	 "
+			       "There is no reliable way to recover them.\n"
+			       "	 "
+			       "Use this command only for testing purposes "
+			       "if you\n"
+			       "	 "
+			       "are shure of what you are doing!\n"
+			       "\nReally scrub this NAND flash? <y/N>\n"
+				);
+
+			if (getc() == 'y' && getc() == '\r') {
+				opts.scrub = 1;
+			} else {
+				printf("scrub aborted\n");
+				return -1;
+			}
+		}
+		ret = nand_erase_opts(nand, &opts);
 		printf("%s\n", ret ? "ERROR" : "OK");
 
 		return ret == 0 ? 0 : 1;
@@ -228,37 +286,153 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 
 	/* read write */
 	if (strncmp(cmd, "read", 4) == 0 || strncmp(cmd, "write", 5) == 0) {
+		int read;
+
 		if (argc < 4)
 			goto usage;
-/*
-		s = strchr(cmd, '.');
-		clean = CLEAN_NONE;
-		if (s != NULL) {
-			if (strcmp(s, ".jffs2") == 0 || strcmp(s, ".e") == 0
-			    || strcmp(s, ".i"))
-				clean = CLEAN_JFFS2;
-		}
-*/
+
 		addr = (ulong)simple_strtoul(argv[2], NULL, 16);
 
 		arg_off_size(argc - 3, argv + 3, &off, &size, nand->size);
 		if (off == 0 && size == 0)
 			return 1;
 
-		i = strncmp(cmd, "read", 4) == 0;	/* 1 = read, 0 = write */
+		read = strncmp(cmd, "read", 4) == 0; /* 1 = read, 0 = write */
 		printf("\nNAND %s: device %d offset %u, size %u ... ",
-		       i ? "read" : "write", nand_curr_device, off, size);
+		       read ? "read" : "write", nand_curr_device, off, size);
 
-		if (i)
+		s = strchr(cmd, '.');
+		if (s != NULL &&
+		    (!strcmp(s, ".jffs2") || !strcmp(s, ".e") || !strcmp(s, ".i"))) {
+			if (read) {
+				/* read */
+				nand_read_options_t opts;
+				memset(&opts, 0, sizeof(opts));
+				opts.buffer	= (u_char*) addr;
+				opts.length	= size;
+				opts.offset	= off;
+				opts.quiet      = quiet;
+				ret = nand_read_opts(nand, &opts);
+			} else {
+				/* write */
+				nand_write_options_t opts;
+				memset(&opts, 0, sizeof(opts));
+				opts.buffer	= (u_char*) addr;
+				opts.length	= size;
+				opts.offset	= off;
+				/* opts.forcejffs2 = 1; */
+				opts.pad	= 1;
+				opts.blockalign = 1;
+				opts.quiet      = quiet;
+				ret = nand_write_opts(nand, &opts);
+			}
+			printf("%s\n", ret ? "ERROR" : "OK");
+			return ret == 0 ? 0 : 1;
+		}
+
+		if (read)
 			ret = nand_read(nand, off, &size, (u_char *)addr);
 		else
 			ret = nand_write(nand, off, &size, (u_char *)addr);
 
 		printf(" %d bytes %s: %s\n", size,
-		       i ? "read" : "written", ret ? "ERROR" : "OK");
+		       read ? "read" : "written", ret ? "ERROR" : "OK");
 
 		return ret == 0 ? 0 : 1;
 	}
+
+	/* 2006-09-28 gc: implement missing commands */
+	if (strcmp(cmd, "markbad") == 0) {
+		addr = (ulong)simple_strtoul(argv[2], NULL, 16);
+
+		int ret = nand->block_markbad(nand, addr);
+		if (ret == 0) {
+			printf("block 0x%08lx successfully marked as bad\n",
+			       (ulong) addr);
+			return 0;
+		} else {
+			printf("block 0x%08lx NOT marked as bad! ERROR %d\n",
+			       (ulong) addr, ret);
+		}
+		return 1;
+	}
+	if (strcmp(cmd, "biterr") == 0) {
+		/* todo */
+		return 1;
+	}
+
+	if (strcmp(cmd, "lock") == 0) {
+		int tight  = 0;
+		int status = 0;
+		if (argc == 3) {
+			if (!strcmp("tight", argv[2]))
+				tight = 1;
+			if (!strcmp("status", argv[2]))
+				status = 1;
+		}
+
+		if (status) {
+			ulong block_start = 0;
+			ulong off;
+			int last_status = -1;
+
+			struct nand_chip *nand_chip = nand->priv;
+			/* check the WP bit */
+			nand_chip->cmdfunc (nand, NAND_CMD_STATUS, -1, -1);
+			printf("device is %swrite protected\n",
+			       (nand_chip->read_byte(nand) & 0x80 ?
+				"NOT " : "" ) );
+
+			for (off = 0; off < nand->size; off += nand->oobblock) {
+				int s = nand_get_lock_status(nand, off);
+
+				/* print message only if status has changed
+				 * or at end of chip
+				 */
+				if (off == nand->size - nand->oobblock
+				    || (s != last_status && off != 0))	{
+
+					printf("%08x - %08x: %8d pages %s%s%s\n",
+					       block_start,
+					       off-1,
+					       (off-block_start)/nand->oobblock,
+					       ((last_status & NAND_LOCK_STATUS_TIGHT) ? "TIGHT " : ""),
+					       ((last_status & NAND_LOCK_STATUS_LOCK) ? "LOCK " : ""),
+					       ((last_status & NAND_LOCK_STATUS_UNLOCK) ? "UNLOCK " : ""));
+				}
+
+				last_status = s;
+		       }
+		} else {
+			if (!nand_lock(nand, tight)) {
+				printf ("NAND flash successfully locked\n");
+			} else {
+				printf ("Error locking NAND flash. \n");
+				return 1;
+			}
+		}
+		return 0;
+	}
+
+	if (strcmp(cmd, "unlock") == 0) {
+		if (argc == 2) {
+			off = 0;
+			size = nand->size;
+		} else {
+			arg_off_size(argc - 2, argv + 2, &off, &size,
+				     nand->size);
+		}
+
+		if (!nand_unlock(nand, off, size)) {
+			printf("NAND flash successfully unlocked\n");
+		} else {
+			printf("Error unlocking NAND flash. "
+			       "Write and erase will probably fail\n");
+			return 1;
+		}
+		return 0;
+	}
+
 usage:
 	printf("Usage:\n%s\n", cmdtp->usage);
 	return 1;
@@ -277,7 +451,9 @@ U_BOOT_CMD(nand, 5, 1, do_nand,
 	"nand dump[.oob] off - dump page\n"
 	"nand scrub - really clean NAND erasing bad blocks (UNSAFE)\n"
 	"nand markbad off - mark bad block at offset (UNSAFE)\n"
-	"nand biterr off - make a bit error at offset (UNSAFE)\n");
+	"nand biterr off - make a bit error at offset (UNSAFE)\n"
+	"nand lock [tight] [status] - bring nand to lock state or display locked pages\n"
+	"nand unlock [offset] [size] - unlock section\n");
 
 int do_nandboot(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
@@ -596,7 +772,7 @@ int do_nand (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 			return 1;
 		}
 
-		printf ("\nNAND %s: device %d offset %ld, size %ld ... ",
+		printf ("\nNAND %s: device %d offset %ld, size %ld ...\n",
 			(cmd & NANDRW_READ) ? "read" : "write",
 			curr_device, off, size);
 
@@ -615,7 +791,7 @@ int do_nand (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 		ulong size = simple_strtoul(argv[3 + clean], NULL, 16);
 		int ret;
 
-		printf ("\nNAND erase: device %d offset %ld, size %ld ... ",
+		printf ("\nNAND erase: device %d offset %ld, size %ld ...\n",
 			curr_device, off, size);
 
 		ret = nand_legacy_erase (nand_dev_desc + curr_device,
@@ -635,7 +811,7 @@ int do_nand (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 
 U_BOOT_CMD(
 	nand,	5,	1,	do_nand,
-	"nand    - NAND sub-system\n",
+	"nand    - legacy NAND sub-system\n",
 	"info  - show available NAND devices\n"
 	"nand device [dev] - show or set current device\n"
 	"nand read[.jffs2[s]]  addr off size\n"
diff --git a/doc/README.nand b/doc/README.nand
index f2d6a5b..2b9a529 100644
--- a/doc/README.nand
+++ b/doc/README.nand
@@ -207,3 +207,47 @@ As mentioned above, the legacy code is still used by the DoC subsystem.
 The consequence of this is that the legacy NAND can't be removed  from
 the tree until the DoC is ported to use the new NAND support (or boards
 with DoC will break).
+
+
+
+Additional improvements to the NAND subsystem by Guido Classen, 10-10-2006
+
+JFFS2 related commands:
+
+  implement "nand erase clean" and old "nand erase"
+  using both the new code which is able to skip bad blocks
+  "nand erase clean" additionally writes JFFS2-cleanmarkers in the oob.
+
+  "nand write.jffs2"
+  like "nand write" but skip found bad eraseblocks
+
+  "nand read.jffs2"
+  like "nand read" but skip found bad eraseblocks
+
+Miscellaneous and testing commands:
+  "markbad [offset]"
+  create an artificial bad block (for testing bad block handling)
+
+  "scrub [offset length]"
+  like "erase" but don't skip bad block. Instead erase them.
+  DANGEROUS!!! Factory set bad blocks will be lost. Use only
+  to remove artificial bad blocks created with the "markbad" command.
+
+
+NAND locking command (for chips with active LOCKPRE pin)
+
+  "nand lock"
+  set NAND chip to lock state (all pages locked)
+
+  "nand lock tight"
+  set NAND chip to lock tight state (software can't change locking anymore)
+
+  "nand lock status"
+  displays current locking status of all pages
+
+  "nand unlock [offset] [size]"
+  unlock consecutive area (can be called multiple times for different areas)
+
+
+I have tested the code with board containing 128MiB NAND large page chips
+and 32MiB small page chips.
diff --git a/drivers/nand/Makefile b/drivers/nand/Makefile
index b03604d..fb0185b 100644
--- a/drivers/nand/Makefile
+++ b/drivers/nand/Makefile
@@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB 	:= $(obj)libnand.a
 
-COBJS 	:= nand.o nand_base.o nand_ids.o nand_ecc.o nand_bbt.o
+COBJS 	:= nand.o nand_base.o nand_ids.o nand_ecc.o nand_bbt.o nand_util.o
 
 SRCS 	:= $(COBJS:.o=.c)
 OBJS 	:= $(addprefix $(obj),$(COBJS))
diff --git a/drivers/nand/nand_util.c b/drivers/nand/nand_util.c
new file mode 100644
index 0000000..5a8e58a
--- /dev/null
+++ b/drivers/nand/nand_util.c
@@ -0,0 +1,869 @@
+/*
+ * drivers/nand/nand_util.c
+ *
+ * Copyright (C) 2006 by Weiss-Electronic GmbH.
+ * All rights reserved.
+ *
+ * @author:	Guido Classen <clagix@gmail.com>
+ * @descr:	NAND Flash support
+ * @references: borrowed heavily from Linux mtd-utils code:
+ *		flash_eraseall.c by Arcom Control System Ltd
+ *		nandwrite.c by Steven J. Hill (sjhill@realitydiluted.com)
+ *			       and Thomas Gleixner (tglx@linutronix.de)
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <common.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
+
+#include <command.h>
+#include <watchdog.h>
+#include <malloc.h>
+
+#include <nand.h>
+#include <jffs2/jffs2.h>
+
+typedef struct erase_info erase_info_t;
+typedef struct mtd_info	  mtd_info_t;
+
+/* support only for native endian JFFS2 */
+#define cpu_to_je16(x) (x)
+#define cpu_to_je32(x) (x)
+
+/*****************************************************************************/
+static int nand_block_bad_scrub(struct mtd_info *mtd, loff_t ofs, int getchip)
+{
+	return 0;
+}
+
+/**
+ * nand_erase_opts: - erase NAND flash with support for various options
+ *		      (jffs2 formating)
+ *
+ * @param meminfo	NAND device to erase
+ * @param opts		options,  @see struct nand_erase_options
+ * @return		0 in case of success
+ *
+ * This code is ported from flash_eraseall.c from Linux mtd utils by
+ * Arcom Control System Ltd.
+ */
+int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
+{
+	struct jffs2_unknown_node cleanmarker;
+	int clmpos = 0;
+	int clmlen = 8;
+	erase_info_t erase;
+	ulong erase_length;
+	int isNAND;
+	int bbtest = 1;
+	int result;
+	int percent_complete = -1;
+	int (*nand_block_bad_old)(struct mtd_info *, loff_t, int) = NULL;
+	const char *mtd_device = meminfo->name;
+
+	memset(&erase, 0, sizeof(erase));
+
+	erase.mtd = meminfo;
+	erase.len  = meminfo->erasesize;
+	if (opts->offset == 0 && opts->length == 0) {
+		/* erase complete chip */
+		erase.addr = 0;
+		erase_length = meminfo->size;
+	} else {
+		/* erase specified region */
+		erase.addr = opts->offset;
+		erase_length = opts->length;
+	}
+
+	isNAND = meminfo->type == MTD_NANDFLASH ? 1 : 0;
+
+	if (opts->jffs2) {
+		cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
+		cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
+		if (isNAND) {
+			struct nand_oobinfo *oobinfo = &meminfo->oobinfo;
+
+			/* check for autoplacement */
+			if (oobinfo->useecc == MTD_NANDECC_AUTOPLACE) {
+				/* get the position of the free bytes */
+				if (!oobinfo->oobfree[0][1]) {
+					printf(" Eeep. Autoplacement selected "
+					       "and no empty space in oob\n");
+					return -1;
+				}
+				clmpos = oobinfo->oobfree[0][0];
+				clmlen = oobinfo->oobfree[0][1];
+				if (clmlen > 8)
+					clmlen = 8;
+			} else {
+				/* legacy mode */
+				switch (meminfo->oobsize) {
+				case 8:
+					clmpos = 6;
+					clmlen = 2;
+					break;
+				case 16:
+					clmpos = 8;
+					clmlen = 8;
+					break;
+				case 64:
+					clmpos = 16;
+					clmlen = 8;
+					break;
+				}
+			}
+
+			cleanmarker.totlen = cpu_to_je32(8);
+		} else {
+			cleanmarker.totlen =
+				cpu_to_je32(sizeof(struct jffs2_unknown_node));
+		}
+		cleanmarker.hdr_crc =  cpu_to_je32(
+			crc32_no_comp(0, (unsigned char *) &cleanmarker,
+				      sizeof(struct jffs2_unknown_node) - 4));
+	}
+
+	/* scrub option allows to erase badblock. To prevent internal
+	 * check from erase() method, set block check method to dummy
+	 * and disable bad block table while erasing.
+	 */
+	if (opts->scrub) {
+		struct nand_chip *priv_nand = meminfo->priv;
+
+		nand_block_bad_old = priv_nand->block_bad;
+		priv_nand->block_bad = nand_block_bad_scrub;
+		/* we don't need the bad block table anymore...
+		 * after scrub, there are no bad blocks left!
+		 */
+		if (priv_nand->bbt) {
+			kfree(priv_nand->bbt);
+		}
+		priv_nand->bbt = NULL;
+	}
+
+	for (;
+	     erase.addr < opts->offset + erase_length;
+	     erase.addr += meminfo->erasesize) {
+
+		WATCHDOG_RESET ();
+
+		if (!opts->scrub && bbtest) {
+			int ret = meminfo->block_isbad(meminfo, erase.addr);
+			if (ret > 0) {
+				if (!opts->quiet)
+					printf("\rSkipping bad block at  "
+                                               "0x%08x                   "
+                                               "                         \n",
+                                               erase.addr);
+				continue;
+
+			} else if (ret < 0) {
+				printf("\n%s: MTD get bad block failed: %d\n",
+				       mtd_device,
+				       ret);
+				return -1;
+			}
+		}
+
+		result = meminfo->erase(meminfo, &erase);
+		if (result != 0) {
+			printf("\n%s: MTD Erase failure: %d\n",
+			       mtd_device, result);
+			continue;
+		}
+
+		/* format for JFFS2 ? */
+		if (opts->jffs2) {
+
+			/* write cleanmarker */
+			if (isNAND) {
+				size_t written;
+				result = meminfo->write_oob(meminfo,
+							    erase.addr + clmpos,
+							    clmlen,
+							    &written,
+							    (unsigned char *)
+							    &cleanmarker);
+				if (result != 0) {
+					printf("\n%s: MTD writeoob failure: %d\n",
+					       mtd_device, result);
+					continue;
+				}
+			} else {
+				printf("\n%s: this erase routine only supports"
+				       " NAND devices!\n",
+				       mtd_device);
+			}
+		}
+
+		if (!opts->quiet) {
+			int percent = (int)
+				((unsigned long long)
+				 (erase.addr+meminfo->erasesize-opts->offset)
+				 * 100 / erase_length);
+
+			/* output progress message only at whole percent
+			 * steps to reduce the number of messages printed
+			 * on (slow) serial consoles
+			 */
+			if (percent != percent_complete) {
+				percent_complete = percent;
+
+				printf("\rErasing at 0x%x -- %3d%% complete.",
+				       erase.addr, percent);
+
+				if (opts->jffs2 && result == 0)
+					printf(" Cleanmarker written at 0x%x.",
+					       erase.addr);
+			}
+		}
+	}
+	if (!opts->quiet)
+		printf("\n");
+
+	if (nand_block_bad_old) {
+		struct nand_chip *priv_nand = meminfo->priv;
+
+		priv_nand->block_bad = nand_block_bad_old;
+		priv_nand->scan_bbt(meminfo);
+	}
+
+	return 0;
+}
+
+#define MAX_PAGE_SIZE	2048
+#define MAX_OOB_SIZE	64
+
+/*
+ * buffer array used for writing data
+ */
+static unsigned char data_buf[MAX_PAGE_SIZE];
+static unsigned char oob_buf[MAX_OOB_SIZE];
+
+/* OOB layouts to pass into the kernel as default */
+static struct nand_oobinfo none_oobinfo = {
+	.useecc = MTD_NANDECC_OFF,
+};
+
+static struct nand_oobinfo jffs2_oobinfo = {
+	.useecc = MTD_NANDECC_PLACE,
+	.eccbytes = 6,
+	.eccpos = { 0, 1, 2, 3, 6, 7 }
+};
+
+static struct nand_oobinfo yaffs_oobinfo = {
+	.useecc = MTD_NANDECC_PLACE,
+	.eccbytes = 6,
+	.eccpos = { 8, 9, 10, 13, 14, 15}
+};
+
+static struct nand_oobinfo autoplace_oobinfo = {
+	.useecc = MTD_NANDECC_AUTOPLACE
+};
+
+/**
+ * nand_write_opts: - write image to NAND flash with support for various options
+ *
+ * @param meminfo	NAND device to erase
+ * @param opts		write options (@see nand_write_options)
+ * @return		0 in case of success
+ *
+ * This code is ported from nandwrite.c from Linux mtd utils by
+ * Steven J. Hill and Thomas Gleixner.
+ */
+int nand_write_opts(nand_info_t *meminfo, const nand_write_options_t *opts)
+{
+	int imglen = 0;
+	int pagelen;
+	int baderaseblock;
+	int blockstart = -1;
+	loff_t offs;
+	int readlen;
+	int oobinfochanged = 0;
+	int percent_complete = -1;
+	struct nand_oobinfo old_oobinfo;
+	ulong mtdoffset = opts->offset;
+	ulong erasesize_blockalign;
+	u_char *buffer = opts->buffer;
+	size_t written;
+	int result;
+
+	if (opts->pad && opts->writeoob) {
+		printf("Can't pad when oob data is present.\n");
+		return -1;
+	}
+
+	/* set erasesize to specified number of blocks - to match
+	 * jffs2 (virtual) block size */
+	if (opts->blockalign == 0) {
+		erasesize_blockalign = meminfo->erasesize;
+	} else {
+		erasesize_blockalign = meminfo->erasesize * opts->blockalign;
+	}
+
+	/* make sure device page sizes are valid */
+	if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
+	    && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
+	    && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
+		printf("Unknown flash (not normal NAND)\n");
+		return -1;
+	}
+
+	/* read the current oob info */
+	memcpy(&old_oobinfo, &meminfo->oobinfo, sizeof(old_oobinfo));
+
+	/* write without ecc? */
+	if (opts->noecc) {
+		memcpy(&meminfo->oobinfo, &none_oobinfo,
+		       sizeof(meminfo->oobinfo));
+		oobinfochanged = 1;
+	}
+
+	/* autoplace ECC? */
+	if (opts->autoplace && (old_oobinfo.useecc != MTD_NANDECC_AUTOPLACE)) {
+
+		memcpy(&meminfo->oobinfo, &autoplace_oobinfo,
+		       sizeof(meminfo->oobinfo));
+		oobinfochanged = 1;
+	}
+
+	/* force OOB layout for jffs2 or yaffs? */
+	if (opts->forcejffs2 || opts->forceyaffs) {
+		struct nand_oobinfo *oobsel =
+			opts->forcejffs2 ? &jffs2_oobinfo : &yaffs_oobinfo;
+
+		if (meminfo->oobsize == 8) {
+			if (opts->forceyaffs) {
+				printf("YAFSS cannot operate on "
+				       "256 Byte page size\n");
+				goto restoreoob;
+			}
+			/* Adjust number of ecc bytes */
+			jffs2_oobinfo.eccbytes = 3;
+		}
+
+		memcpy(&meminfo->oobinfo, oobsel, sizeof(meminfo->oobinfo));
+	}
+
+	/* get image length */
+	imglen = opts->length;
+	pagelen = meminfo->oobblock
+		+ ((opts->writeoob != 0) ? meminfo->oobsize : 0);
+
+	/* check, if file is pagealigned */
+	if ((!opts->pad) && ((imglen % pagelen) != 0)) {
+		printf("Input block length is not page aligned\n");
+		goto restoreoob;
+	}
+
+	/* check, if length fits into device */
+	if (((imglen / pagelen) * meminfo->oobblock)
+	     > (meminfo->size - opts->offset)) {
+		printf("Image %d bytes, NAND page %d bytes, "
+		       "OOB area %u bytes, device size %u bytes\n",
+		       imglen, pagelen, meminfo->oobblock, meminfo->size);
+		printf("Input block does not fit into device\n");
+		goto restoreoob;
+	}
+
+	if (!opts->quiet)
+		printf("\n");
+
+	/* get data from input and write to the device */
+	while (imglen && (mtdoffset < meminfo->size)) {
+
+		WATCHDOG_RESET ();
+
+		/*
+		 * new eraseblock, check for bad block(s). Stay in the
+		 * loop to be sure if the offset changes because of
+		 * a bad block, that the next block that will be
+		 * written to is also checked. Thus avoiding errors if
+		 * the block(s) after the skipped block(s) is also bad
+		 * (number of blocks depending on the blockalign
+		 */
+		while (blockstart != (mtdoffset & (~erasesize_blockalign+1))) {
+			blockstart = mtdoffset & (~erasesize_blockalign+1);
+			offs = blockstart;
+			baderaseblock = 0;
+
+			/* check all the blocks in an erase block for
+			 * bad blocks */
+			do {
+				int ret = meminfo->block_isbad(meminfo, offs);
+
+				if (ret < 0) {
+					printf("Bad block check failed\n");
+					goto restoreoob;
+				}
+				if (ret == 1) {
+					baderaseblock = 1;
+					if (!opts->quiet)
+						printf("\rBad block at 0x%lx "
+						       "in erase block from "
+						       "0x%x will be skipped\n",
+						       (long) offs,
+						       blockstart);
+				}
+
+				if (baderaseblock) {
+					mtdoffset = blockstart
+						+ erasesize_blockalign;
+				}
+				offs +=	 erasesize_blockalign
+					/ opts->blockalign;
+			} while (offs < blockstart + erasesize_blockalign);
+		}
+
+		readlen = meminfo->oobblock;
+		if (opts->pad && (imglen < readlen)) {
+			readlen = imglen;
+			memset(data_buf + readlen, 0xff,
+			       meminfo->oobblock - readlen);
+		}
+
+		/* read page data from input memory buffer */
+		memcpy(data_buf, buffer, readlen);
+		buffer += readlen;
+
+		if (opts->writeoob) {
+			/* read OOB data from input memory block, exit
+			 * on failure */
+			memcpy(oob_buf, buffer, meminfo->oobsize);
+			buffer += meminfo->oobsize;
+
+			/* write OOB data first, as ecc will be placed
+			 * in there*/
+			result = meminfo->write_oob(meminfo,
+						    mtdoffset,
+						    meminfo->oobsize,
+						    &written,
+						    (unsigned char *)
+						    &oob_buf);
+
+			if (result != 0) {
+				printf("\nMTD writeoob failure: %d\n",
+				       result);
+				goto restoreoob;
+			}
+			imglen -= meminfo->oobsize;
+		}
+
+		/* write out the page data */
+		result = meminfo->write(meminfo,
+					mtdoffset,
+					meminfo->oobblock,
+					&written,
+					(unsigned char *) &data_buf);
+
+		if (result != 0) {
+			printf("writing NAND page at offset 0x%lx failed\n",
+			       mtdoffset);
+			goto restoreoob;
+		}
+		imglen -= readlen;
+
+		if (!opts->quiet) {
+			int percent = (int)
+				((unsigned long long)
+				 (opts->length-imglen) * 100
+				 / opts->length);
+			/* output progress message only at whole percent
+			 * steps to reduce the number of messages printed
+			 * on (slow) serial consoles
+			 */
+			if (percent != percent_complete) {
+				printf("\rWriting data at 0x%x "
+				       "-- %3d%% complete.",
+				       mtdoffset, percent);
+				percent_complete = percent;
+			}
+		}
+
+		mtdoffset += meminfo->oobblock;
+	}
+
+	if (!opts->quiet)
+		printf("\n");
+
+restoreoob:
+	if (oobinfochanged) {
+		memcpy(&meminfo->oobinfo, &old_oobinfo,
+		       sizeof(meminfo->oobinfo));
+	}
+
+	if (imglen > 0) {
+		printf("Data did not fit into device, due to bad blocks\n");
+		return -1;
+	}
+
+	/* return happy */
+	return 0;
+}
+
+/**
+ * nand_read_opts: - read image from NAND flash with support for various options
+ *
+ * @param meminfo	NAND device to erase
+ * @param opts		read options (@see struct nand_read_options)
+ * @return		0 in case of success
+ *
+ */
+int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts)
+{
+	int imglen = opts->length;
+	int pagelen;
+	int baderaseblock;
+	int blockstart = -1;
+	int percent_complete = -1;
+	loff_t offs;
+	size_t readlen;
+	ulong mtdoffset = opts->offset;
+	u_char *buffer = opts->buffer;
+	int result;
+
+	/* make sure device page sizes are valid */
+	if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
+	    && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
+	    && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
+		printf("Unknown flash (not normal NAND)\n");
+		return -1;
+	}
+
+	pagelen = meminfo->oobblock
+		+ ((opts->readoob != 0) ? meminfo->oobsize : 0);
+
+	/* check, if length is not larger than device */
+	if (((imglen / pagelen) * meminfo->oobblock)
+	     > (meminfo->size - opts->offset)) {
+		printf("Image %d bytes, NAND page %d bytes, "
+		       "OOB area %u bytes, device size %u bytes\n",
+		       imglen, pagelen, meminfo->oobblock, meminfo->size);
+		printf("Input block is larger than device\n");
+		return -1;
+	}
+
+	if (!opts->quiet)
+		printf("\n");
+
+	/* get data from input and write to the device */
+	while (imglen && (mtdoffset < meminfo->size)) {
+
+		WATCHDOG_RESET ();
+
+		/*
+		 * new eraseblock, check for bad block(s). Stay in the
+		 * loop to be sure if the offset changes because of
+		 * a bad block, that the next block that will be
+		 * written to is also checked. Thus avoiding errors if
+		 * the block(s) after the skipped block(s) is also bad
+		 * (number of blocks depending on the blockalign
+		 */
+		while (blockstart != (mtdoffset & (~meminfo->erasesize+1))) {
+			blockstart = mtdoffset & (~meminfo->erasesize+1);
+			offs = blockstart;
+			baderaseblock = 0;
+
+			/* check all the blocks in an erase block for
+			 * bad blocks */
+			do {
+				int ret = meminfo->block_isbad(meminfo, offs);
+
+				if (ret < 0) {
+					printf("Bad block check failed\n");
+					return -1;
+				}
+				if (ret == 1) {
+					baderaseblock = 1;
+					if (!opts->quiet)
+						printf("\rBad block at 0x%lx "
+						       "in erase block from "
+						       "0x%x will be skipped\n",
+						       (long) offs,
+						       blockstart);
+				}
+
+				if (baderaseblock) {
+					mtdoffset = blockstart
+						+ meminfo->erasesize;
+				}
+				offs +=	 meminfo->erasesize;
+
+			} while (offs < blockstart + meminfo->erasesize);
+		}
+
+
+		/* read page data to memory buffer */
+		result = meminfo->read(meminfo,
+				       mtdoffset,
+				       meminfo->oobblock,
+				       &readlen,
+				       (unsigned char *) &data_buf);
+
+		if (result != 0) {
+			printf("reading NAND page at offset 0x%lx failed\n",
+			       mtdoffset);
+			return -1;
+		}
+
+		if (imglen < readlen) {
+			readlen = imglen;
+		}
+
+		memcpy(buffer, data_buf, readlen);
+		buffer += readlen;
+		imglen -= readlen;
+
+		if (opts->readoob) {
+			result = meminfo->read_oob(meminfo,
+						   mtdoffset,
+						   meminfo->oobsize,
+						   &readlen,
+						   (unsigned char *)
+						   &oob_buf);
+
+			if (result != 0) {
+				printf("\nMTD readoob failure: %d\n",
+				       result);
+				return -1;
+			}
+
+
+			if (imglen < readlen) {
+				readlen = imglen;
+			}
+
+			memcpy(buffer, oob_buf, readlen);
+
+			buffer += readlen;
+			imglen -= readlen;
+		}
+
+		if (!opts->quiet) {
+			int percent = (int)
+				((unsigned long long)
+				 (opts->length-imglen) * 100
+				 / opts->length);
+			/* output progress message only at whole percent
+			 * steps to reduce the number of messages printed
+			 * on (slow) serial consoles
+			 */
+			if (percent != percent_complete) {
+			if (!opts->quiet)
+				printf("\rReading data from 0x%x "
+				       "-- %3d%% complete.",
+				       mtdoffset, percent);
+				percent_complete = percent;
+			}
+		}
+
+		mtdoffset += meminfo->oobblock;
+	}
+
+	if (!opts->quiet)
+		printf("\n");
+
+	if (imglen > 0) {
+		printf("Could not read entire image due to bad blocks\n");
+		return -1;
+	}
+
+	/* return happy */
+	return 0;
+}
+
+/******************************************************************************
+ * Support for locking / unlocking operations of some NAND devices
+ *****************************************************************************/
+
+#define NAND_CMD_LOCK		0x2a
+#define NAND_CMD_LOCK_TIGHT	0x2c
+#define NAND_CMD_UNLOCK1	0x23
+#define NAND_CMD_UNLOCK2	0x24
+#define NAND_CMD_LOCK_STATUS	0x7a
+
+/**
+ * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
+ *	      state
+ *
+ * @param meminfo	nand mtd instance
+ * @param tight		bring device in lock tight mode
+ *
+ * @return		0 on success, -1 in case of error
+ *
+ * The lock / lock-tight command only applies to the whole chip. To get some
+ * parts of the chip lock and others unlocked use the following sequence:
+ *
+ * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
+ * - Call nand_unlock() once for each consecutive area to be unlocked
+ * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
+ *
+ *   If the device is in lock-tight state software can't change the
+ *   current active lock/unlock state of all pages. nand_lock() / nand_unlock()
+ *   calls will fail. It is only posible to leave lock-tight state by
+ *   an hardware signal (low pulse on _WP pin) or by power down.
+ */
+int nand_lock(nand_info_t *meminfo, int tight)
+{
+	int ret = 0;
+	int status;
+	struct nand_chip *this = meminfo->priv;
+
+	/* select the NAND device */
+	this->select_chip(meminfo, 0);
+
+	this->cmdfunc(meminfo,
+		      (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK),
+		      -1, -1);
+
+	/* call wait ready function */
+	status = this->waitfunc(meminfo, this, FL_WRITING);
+
+	/* see if device thinks it succeeded */
+	if (status & 0x01) {
+		ret = -1;
+	}
+
+	/* de-select the NAND device */
+	this->select_chip(meminfo, -1);
+	return ret;
+}
+
+/**
+ * nand_get_lock_status: - query current lock state from one page of NAND
+ *			   flash
+ *
+ * @param meminfo	nand mtd instance
+ * @param offset	page address to query (muss be page aligned!)
+ *
+ * @return		-1 in case of error
+ *			>0 lock status:
+ *			  bitfield with the following combinations:
+ *			  NAND_LOCK_STATUS_TIGHT: page in tight state
+ *			  NAND_LOCK_STATUS_LOCK:  page locked
+ *			  NAND_LOCK_STATUS_UNLOCK: page unlocked
+ *
+ */
+int nand_get_lock_status(nand_info_t *meminfo, ulong offset)
+{
+	int ret = 0;
+	int chipnr;
+	int page;
+	struct nand_chip *this = meminfo->priv;
+
+	/* select the NAND device */
+	chipnr = (int)(offset >> this->chip_shift);
+	this->select_chip(meminfo, chipnr);
+
+
+	if ((offset & (meminfo->oobblock - 1)) != 0) {
+		printf ("nand_get_lock_status: "
+			"Start address must be beginning of "
+			"nand page!\n");
+		ret = -1;
+		goto out;
+	}
+
+	/* check the Lock Status */
+	page = (int)(offset >> this->page_shift);
+	this->cmdfunc(meminfo, NAND_CMD_LOCK_STATUS, -1, page & this->pagemask);
+
+	ret = this->read_byte(meminfo) & (NAND_LOCK_STATUS_TIGHT
+					  | NAND_LOCK_STATUS_LOCK
+					  | NAND_LOCK_STATUS_UNLOCK);
+
+ out:
+	/* de-select the NAND device */
+	this->select_chip(meminfo, -1);
+	return ret;
+}
+
+/**
+ * nand_unlock: - Unlock area of NAND pages
+ *		  only one consecutive area can be unlocked at one time!
+ *
+ * @param meminfo	nand mtd instance
+ * @param start		start byte address
+ * @param length	number of bytes to unlock (must be a multiple of
+ *			page size nand->oobblock)
+ *
+ * @return		0 on success, -1 in case of error
+ */
+int nand_unlock(nand_info_t *meminfo, ulong start, ulong length)
+{
+	int ret = 0;
+	int chipnr;
+	int status;
+	int page;
+	struct nand_chip *this = meminfo->priv;
+	printf ("nand_unlock: start: %08x, length: %d!\n",
+		(int)start, (int)length);
+
+	/* select the NAND device */
+	chipnr = (int)(start >> this->chip_shift);
+	this->select_chip(meminfo, chipnr);
+
+	/* check the WP bit */
+	this->cmdfunc(meminfo, NAND_CMD_STATUS, -1, -1);
+	if ((this->read_byte(meminfo) & 0x80) == 0) {
+		printf ("nand_unlock: Device is write protected!\n");
+		ret = -1;
+		goto out;
+	}
+
+	if ((start & (meminfo->oobblock - 1)) != 0) {
+		printf ("nand_unlock: Start address must be beginning of "
+			"nand page!\n");
+		ret = -1;
+		goto out;
+	}
+
+	if (length == 0 || (length & (meminfo->oobblock - 1)) != 0) {
+		printf ("nand_unlock: Length must be a multiple of nand page "
+			"size!\n");
+		ret = -1;
+		goto out;
+	}
+
+	/* submit address of first page to unlock */
+	page = (int)(start >> this->page_shift);
+	this->cmdfunc(meminfo, NAND_CMD_UNLOCK1, -1, page & this->pagemask);
+
+	/* submit ADDRESS of LAST page to unlock */
+	page += (int)(length >> this->page_shift) - 1;
+	this->cmdfunc(meminfo, NAND_CMD_UNLOCK2, -1, page & this->pagemask);
+
+	/* call wait ready function */
+	status = this->waitfunc(meminfo, this, FL_WRITING);
+	/* see if device thinks it succeeded */
+	if (status & 0x01) {
+		/* there was an error */
+		ret = -1;
+		goto out;
+	}
+
+ out:
+	/* de-select the NAND device */
+	this->select_chip(meminfo, -1);
+	return ret;
+}
+
+#endif /* (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY) */
diff --git a/include/nand.h b/include/nand.h
index 905115b..5c7311f 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -60,4 +60,61 @@ static inline int nand_erase(nand_info_t *info, ulong off, ulong size)
 	return info->erase(info, &instr);
 }
 
+
+/*****************************************************************************
+ * declarations from nand_util.c
+ ****************************************************************************/
+
+struct nand_write_options {
+	u_char *buffer;		/* memory block containing image to write */
+	ulong length;		/* number of bytes to write */
+	ulong offset;		/* start address in NAND */
+	int quiet;		/* don't display progress messages */
+	int autoplace;		/* if true use auto oob layout */
+	int forcejffs2;		/* force jffs2 oob layout */
+	int forceyaffs;		/* force yaffs oob layout */
+	int noecc;		/* write without ecc */
+	int writeoob;		/* image contains oob data */
+	int pad;		/* pad to page size */
+	int blockalign;		/* 1|2|4 set multiple of eraseblocks
+				 * to align to */
+};
+
+typedef struct nand_write_options nand_write_options_t;
+
+struct nand_read_options {
+	u_char *buffer;		/* memory block in which read image is written*/
+	ulong length;		/* number of bytes to read */
+	ulong offset;		/* start address in NAND */
+	int quiet;		/* don't display progress messages */
+	int readoob;		/* put oob data in image */
+};
+
+typedef struct nand_read_options nand_read_options_t;
+
+struct nand_erase_options {
+	ulong length;		/* number of bytes to erase */
+	ulong offset;		/* first address in NAND to erase */
+	int quiet;		/* don't display progress messages */
+	int jffs2;		/* if true: format for jffs2 usage
+				 * (write appropriate cleanmarker blocks) */
+	int scrub;		/* if true, really clean NAND by erasing
+				 * bad blocks (UNSAFE) */
+};
+
+typedef struct nand_erase_options nand_erase_options_t;
+
+int nand_write_opts(nand_info_t *meminfo, const nand_write_options_t *opts);
+
+int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts);
+int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts);
+
+#define NAND_LOCK_STATUS_TIGHT	0x01
+#define NAND_LOCK_STATUS_LOCK	0x02
+#define NAND_LOCK_STATUS_UNLOCK 0x04
+
+int nand_lock( nand_info_t *meminfo, int tight );
+int nand_unlock( nand_info_t *meminfo, ulong start, ulong length );
+int nand_get_lock_status(nand_info_t *meminfo, ulong offset);
+
 #endif
diff --git a/lib_generic/crc32.c b/lib_generic/crc32.c
index 50ca4ffd..8283413 100644
--- a/lib_generic/crc32.c
+++ b/lib_generic/crc32.c
@@ -171,7 +171,9 @@ uLong ZEXPORT crc32(crc, buf, len)
     return crc ^ 0xffffffffL;
 }
 
-#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)
+#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)					\
+	|| (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
+
 
 /* No ones complement version. JFFS2 (and other things ?)
  * don't use ones compliment in their CRC calculations.