added boot script files to repository

1 files changed, 2092 insertions, 0 deletions

diff --git a/u-boot/common/cmd_mtdparts.c b/u-boot/common/cmd_mtdparts.c
new file mode 100644
index 0000000..5481c88
--- /dev/null
+++ b/u-boot/common/cmd_mtdparts.c
@@ -0,0 +1,2092 @@
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * Robert Schwebel, Pengutronix, <r.schwebel@pengutronix.de>
+ *
+ * (C) Copyright 2003
+ * Kai-Uwe Bloem, Auerswald GmbH & Co KG, <linux-development@auerswald.de>
+ *
+ * (C) Copyright 2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ *   Added support for reading flash partition table from environment.
+ *   Parsing routines are based on driver/mtd/cmdline.c from the linux 2.4
+ *   kernel tree.
+ *
+ * (C) Copyright 2008
+ * Harald Welte, OpenMoko, Inc., Harald Welte <laforge@openmoko.org>
+ *
+ *   $Id: cmdlinepart.c,v 1.17 2004/11/26 11:18:47 lavinen Exp $
+ *   Copyright 2002 SYSGO Real-Time Solutions GmbH
+ *
+ * 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 as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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
+ */
+
+/*
+ * Three environment variables are used by the parsing routines:
+ *
+ * 'partition' - keeps current partition identifier
+ *
+ * partition  := <part-id>
+ * <part-id>  := <dev-id>,part_num
+ *
+ *
+ * 'mtdids' - linux kernel mtd device id <-> u-boot device id mapping
+ *
+ * mtdids=<idmap>[,<idmap>,...]
+ *
+ * <idmap>    := <dev-id>=<mtd-id>
+ * <dev-id>   := 'nand'|'nor'|'onenand'<dev-num>
+ * <dev-num>  := mtd device number, 0...
+ * <mtd-id>   := unique device tag used by linux kernel to find mtd device (mtd->name)
+ *
+ *
+ * 'mtdparts' - partition list
+ *
+ * mtdparts=mtdparts=<mtd-def>[;<mtd-def>...]
+ *
+ * <mtd-def>  := <mtd-id>:<part-def>[,<part-def>...]
+ * <mtd-id>   := unique device tag used by linux kernel to find mtd device (mtd->name)
+ * <part-def> := <size>[@<offset>][<name>][<ro-flag>]
+ * <size>     := standard linux memsize OR '-' to denote all remaining space
+ * <offset>   := partition start offset within the device
+ * <name>     := '(' NAME ')'
+ * <ro-flag>  := when set to 'ro' makes partition read-only (not used, passed to kernel)
+ *
+ * Notes:
+ * - each <mtd-id> used in mtdparts must albo exist in 'mtddis' mapping
+ * - if the above variables are not set defaults for a given target are used
+ *
+ * Examples:
+ *
+ * 1 NOR Flash, with 1 single writable partition:
+ * mtdids=nor0=edb7312-nor
+ * mtdparts=mtdparts=edb7312-nor:-
+ *
+ * 1 NOR Flash with 2 partitions, 1 NAND with one
+ * mtdids=nor0=edb7312-nor,nand0=edb7312-nand
+ * mtdparts=mtdparts=edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <malloc.h>
+#include <jffs2/load_kernel.h>
+#include <linux/list.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/mtd/mtd.h>
+
+#if defined(CONFIG_CMD_NAND)
+#include <linux/mtd/nand.h>
+#include <nand.h>
+#endif
+
+#if defined(CONFIG_CMD_ONENAND)
+#include <linux/mtd/onenand.h>
+#include <onenand_uboot.h>
+#endif
+
+/* special size referring to all the remaining space in a partition */
+#define SIZE_REMAINING		0xFFFFFFFF
+
+/* special offset value, it is used when not provided by user
+ *
+ * this value is used temporarily during parsing, later such offests
+ * are recalculated */
+#define OFFSET_NOT_SPECIFIED	0xFFFFFFFF
+
+/* minimum partition size */
+#define MIN_PART_SIZE		4096
+
+/* this flag needs to be set in part_info struct mask_flags
+ * field for read-only partitions */
+#define MTD_WRITEABLE_CMD		1
+
+/* default values for mtdids and mtdparts variables */
+#if defined(MTDIDS_DEFAULT)
+static const char *const mtdids_default = MTDIDS_DEFAULT;
+#else
+static const char *const mtdids_default = NULL;
+#endif
+
+#if defined(MTDPARTS_DEFAULT)
+static const char *const mtdparts_default = MTDPARTS_DEFAULT;
+#else
+static const char *const mtdparts_default = NULL;
+#endif
+
+/* copies of last seen 'mtdids', 'mtdparts' and 'partition' env variables */
+#define MTDIDS_MAXLEN		128
+#define MTDPARTS_MAXLEN		512
+#define PARTITION_MAXLEN	16
+static char last_ids[MTDIDS_MAXLEN];
+static char last_parts[MTDPARTS_MAXLEN];
+static char last_partition[PARTITION_MAXLEN];
+
+/* low level jffs2 cache cleaning routine */
+extern void jffs2_free_cache(struct part_info *part);
+
+/* mtdids mapping list, filled by parse_ids() */
+struct list_head mtdids;
+
+/* device/partition list, parse_cmdline() parses into here */
+struct list_head devices;
+
+/* current active device and partition number */
+struct mtd_device *current_mtd_dev = NULL;
+u8 current_mtd_partnum = 0;
+
+static struct part_info* mtd_part_info(struct mtd_device *dev, unsigned int part_num);
+
+/* command line only routines */
+static struct mtdids* id_find_by_mtd_id(const char *mtd_id, unsigned int mtd_id_len);
+static int device_del(struct mtd_device *dev);
+
+/**
+ * Parses a string into a number.  The number stored at ptr is
+ * potentially suffixed with K (for kilobytes, or 1024 bytes),
+ * M (for megabytes, or 1048576 bytes), or G (for gigabytes, or
+ * 1073741824).  If the number is suffixed with K, M, or G, then
+ * the return value is the number multiplied by one kilobyte, one
+ * megabyte, or one gigabyte, respectively.
+ *
+ * @param ptr where parse begins
+ * @param retptr output pointer to next char after parse completes (output)
+ * @return resulting unsigned int
+ */
+static unsigned long memsize_parse (const char *const ptr, const char **retptr)
+{
+	unsigned long ret = simple_strtoul(ptr, (char **)retptr, 0);
+
+	switch (**retptr) {
+		case 'G':
+		case 'g':
+			ret <<= 10;
+		case 'M':
+		case 'm':
+			ret <<= 10;
+		case 'K':
+		case 'k':
+			ret <<= 10;
+			(*retptr)++;
+		default:
+			break;
+	}
+
+	return ret;
+}
+
+/**
+ * Format string describing supplied size. This routine does the opposite job
+ * to memsize_parse(). Size in bytes is converted to string and if possible
+ * shortened by using k (kilobytes), m (megabytes) or g (gigabytes) suffix.
+ *
+ * Note, that this routine does not check for buffer overflow, it's the caller
+ * who must assure enough space.
+ *
+ * @param buf output buffer
+ * @param size size to be converted to string
+ */
+static void memsize_format(char *buf, u32 size)
+{
+#define SIZE_GB ((u32)1024*1024*1024)
+#define SIZE_MB ((u32)1024*1024)
+#define SIZE_KB ((u32)1024)
+
+	if ((size % SIZE_GB) == 0)
+		sprintf(buf, "%ug", size/SIZE_GB);
+	else if ((size % SIZE_MB) == 0)
+		sprintf(buf, "%um", size/SIZE_MB);
+	else if (size % SIZE_KB == 0)
+		sprintf(buf, "%uk", size/SIZE_KB);
+	else
+		sprintf(buf, "%u", size);
+}
+
+/**
+ * This routine does global indexing of all partitions. Resulting index for
+ * current partition is saved in 'mtddevnum'. Current partition name in
+ * 'mtddevname'.
+ */
+static void index_partitions(void)
+{
+	char buf[16];
+	u16 mtddevnum;
+	struct part_info *part;
+	struct list_head *dentry;
+	struct mtd_device *dev;
+
+	debug("--- index partitions ---\n");
+
+	if (current_mtd_dev) {
+		mtddevnum = 0;
+		list_for_each(dentry, &devices) {
+			dev = list_entry(dentry, struct mtd_device, link);
+			if (dev == current_mtd_dev) {
+				mtddevnum += current_mtd_partnum;
+				sprintf(buf, "%d", mtddevnum);
+				setenv("mtddevnum", buf);
+				break;
+			}
+			mtddevnum += dev->num_parts;
+		}
+
+		part = mtd_part_info(current_mtd_dev, current_mtd_partnum);
+		setenv("mtddevname", part->name);
+
+		debug("=> mtddevnum %d,\n=> mtddevname %s\n", mtddevnum, part->name);
+	} else {
+		setenv("mtddevnum", NULL);
+		setenv("mtddevname", NULL);
+
+		debug("=> mtddevnum NULL\n=> mtddevname NULL\n");
+	}
+}
+
+/**
+ * Save current device and partition in environment variable 'partition'.
+ */
+static void current_save(void)
+{
+	char buf[16];
+
+	debug("--- current_save ---\n");
+
+	if (current_mtd_dev) {
+		sprintf(buf, "%s%d,%d", MTD_DEV_TYPE(current_mtd_dev->id->type),
+					current_mtd_dev->id->num, current_mtd_partnum);
+
+		setenv("partition", buf);
+		strncpy(last_partition, buf, 16);
+
+		debug("=> partition %s\n", buf);
+	} else {
+		setenv("partition", NULL);
+		last_partition[0] = '\0';
+
+		debug("=> partition NULL\n");
+	}
+	index_partitions();
+}
+
+
+/**
+ * Produce a mtd_info given a type and num.
+ *
+ * @param type mtd type
+ * @param num mtd number
+ * @param mtd a pointer to an mtd_info instance (output)
+ * @return 0 if device is valid, 1 otherwise
+ */
+static int get_mtd_info(u8 type, u8 num, struct mtd_info **mtd)
+{
+	char mtd_dev[16];
+
+	sprintf(mtd_dev, "%s%d", MTD_DEV_TYPE(type), num);
+	*mtd = get_mtd_device_nm(mtd_dev);
+	if (IS_ERR(*mtd)) {
+		printf("Device %s not found!\n", mtd_dev);
+		return 1;
+	}
+
+	return 0;
+}
+
+/**
+ * Performs sanity check for supplied flash partition.
+ * Table of existing MTD flash devices is searched and partition device
+ * is located. Alignment with the granularity of nand erasesize is verified.
+ *
+ * @param id of the parent device
+ * @param part partition to validate
+ * @return 0 if partition is valid, 1 otherwise
+ */
+static int part_validate_eraseblock(struct mtdids *id, struct part_info *part)
+{
+	struct mtd_info *mtd = NULL;
+	int i, j;
+	ulong start;
+
+	if (get_mtd_info(id->type, id->num, &mtd))
+		return 1;
+
+	part->sector_size = mtd->erasesize;
+
+	if (!mtd->numeraseregions) {
+		/*
+		 * Only one eraseregion (NAND, OneNAND or uniform NOR),
+		 * checking for alignment is easy here
+		 */
+		if ((unsigned long)part->offset % mtd->erasesize) {
+			printf("%s%d: partition (%s) start offset"
+			       "alignment incorrect\n",
+			       MTD_DEV_TYPE(id->type), id->num, part->name);
+			return 1;
+		}
+
+		if (part->size % mtd->erasesize) {
+			printf("%s%d: partition (%s) size alignment incorrect\n",
+			       MTD_DEV_TYPE(id->type), id->num, part->name);
+			return 1;
+		}
+	} else {
+		/*
+		 * Multiple eraseregions (non-uniform NOR),
+		 * checking for alignment is more complex here
+		 */
+
+		/* Check start alignment */
+		for (i = 0; i < mtd->numeraseregions; i++) {
+			start = mtd->eraseregions[i].offset;
+			for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
+				if (part->offset == start)
+					goto start_ok;
+				start += mtd->eraseregions[i].erasesize;
+			}
+		}
+
+		printf("%s%d: partition (%s) start offset alignment incorrect\n",
+		       MTD_DEV_TYPE(id->type), id->num, part->name);
+		return 1;
+
+	start_ok:
+
+		/* Check end/size alignment */
+		for (i = 0; i < mtd->numeraseregions; i++) {
+			start = mtd->eraseregions[i].offset;
+			for (j = 0; j < mtd->eraseregions[i].numblocks; j++) {
+				if ((part->offset + part->size) == start)
+					goto end_ok;
+				start += mtd->eraseregions[i].erasesize;
+			}
+		}
+		/* Check last sector alignment */
+		if ((part->offset + part->size) == start)
+			goto end_ok;
+
+		printf("%s%d: partition (%s) size alignment incorrect\n",
+		       MTD_DEV_TYPE(id->type), id->num, part->name);
+		return 1;
+
+	end_ok:
+		return 0;
+	}
+
+	return 0;
+}
+
+
+/**
+ * Performs sanity check for supplied partition. Offset and size are verified
+ * to be within valid range. Partition type is checked and either
+ * parts_validate_nor() or parts_validate_nand() is called with the argument
+ * of part.
+ *
+ * @param id of the parent device
+ * @param part partition to validate
+ * @return 0 if partition is valid, 1 otherwise
+ */
+static int part_validate(struct mtdids *id, struct part_info *part)
+{
+	if (part->size == SIZE_REMAINING)
+		part->size = id->size - part->offset;
+
+	if (part->offset > id->size) {
+		printf("%s: offset %08x beyond flash size %08x\n",
+				id->mtd_id, part->offset, id->size);
+		return 1;
+	}
+
+	if ((part->offset + part->size) <= part->offset) {
+		printf("%s%d: partition (%s) size too big\n",
+				MTD_DEV_TYPE(id->type), id->num, part->name);
+		return 1;
+	}
+
+	if (part->offset + part->size > id->size) {
+		printf("%s: partitioning exceeds flash size\n", id->mtd_id);
+		return 1;
+	}
+
+	/*
+	 * Now we need to check if the partition starts and ends on
+	 * sector (eraseblock) regions
+	 */
+	return part_validate_eraseblock(id, part);
+}
+
+/**
+ * Delete selected partition from the partion list of the specified device.
+ *
+ * @param dev device to delete partition from
+ * @param part partition to delete
+ * @return 0 on success, 1 otherwise
+ */
+static int part_del(struct mtd_device *dev, struct part_info *part)
+{
+	u8 current_save_needed = 0;
+
+	/* if there is only one partition, remove whole device */
+	if (dev->num_parts == 1)
+		return device_del(dev);
+
+	/* otherwise just delete this partition */
+
+	if (dev == current_mtd_dev) {
+		/* we are modyfing partitions for the current device,
+		 * update current */
+		struct part_info *curr_pi;
+		curr_pi = mtd_part_info(current_mtd_dev, current_mtd_partnum);
+
+		if (curr_pi) {
+			if (curr_pi == part) {
+				printf("current partition deleted, resetting current to 0\n");
+				current_mtd_partnum = 0;
+			} else if (part->offset <= curr_pi->offset) {
+				current_mtd_partnum--;
+			}
+			current_save_needed = 1;
+		}
+	}
+
+	list_del(&part->link);
+	free(part);
+	dev->num_parts--;
+
+	if (current_save_needed > 0)
+		current_save();
+	else
+		index_partitions();
+
+	return 0;
+}
+
+/**
+ * Delete all partitions from parts head list, free memory.
+ *
+ * @param head list of partitions to delete
+ */
+static void part_delall(struct list_head *head)
+{
+	struct list_head *entry, *n;
+	struct part_info *part_tmp;
+
+	/* clean tmp_list and free allocated memory */
+	list_for_each_safe(entry, n, head) {
+		part_tmp = list_entry(entry, struct part_info, link);
+
+		list_del(entry);
+		free(part_tmp);
+	}
+}
+
+/**
+ * Add new partition to the supplied partition list. Make sure partitions are
+ * sorted by offset in ascending order.
+ *
+ * @param head list this partition is to be added to
+ * @param new partition to be added
+ */
+static int part_sort_add(struct mtd_device *dev, struct part_info *part)
+{
+	struct list_head *entry;
+	struct part_info *new_pi, *curr_pi;
+
+	/* link partition to parrent dev */
+	part->dev = dev;
+
+	if (list_empty(&dev->parts)) {
+		debug("part_sort_add: list empty\n");
+		list_add(&part->link, &dev->parts);
+		dev->num_parts++;
+		index_partitions();
+		return 0;
+	}
+
+	new_pi = list_entry(&part->link, struct part_info, link);
+
+	/* get current partition info if we are updating current device */
+	curr_pi = NULL;
+	if (dev == current_mtd_dev)
+		curr_pi = mtd_part_info(current_mtd_dev, current_mtd_partnum);
+
+	list_for_each(entry, &dev->parts) {
+		struct part_info *pi;
+
+		pi = list_entry(entry, struct part_info, link);
+
+		/* be compliant with kernel cmdline, allow only one partition at offset zero */
+		if ((new_pi->offset == pi->offset) && (pi->offset == 0)) {
+			printf("cannot add second partition at offset 0\n");
+			return 1;
+		}
+
+		if (new_pi->offset <= pi->offset) {
+			list_add_tail(&part->link, entry);
+			dev->num_parts++;
+
+			if (curr_pi && (pi->offset <= curr_pi->offset)) {
+				/* we are modyfing partitions for the current
+				 * device, update current */
+				current_mtd_partnum++;
+				current_save();
+			} else {
+				index_partitions();
+			}
+			return 0;
+		}
+	}
+
+	list_add_tail(&part->link, &dev->parts);
+	dev->num_parts++;
+	index_partitions();
+	return 0;
+}
+
+/**
+ * Add provided partition to the partition list of a given device.
+ *
+ * @param dev device to which partition is added
+ * @param part partition to be added
+ * @return 0 on success, 1 otherwise
+ */
+static int part_add(struct mtd_device *dev, struct part_info *part)
+{
+	/* verify alignment and size */
+	if (part_validate(dev->id, part) != 0)
+		return 1;
+
+	/* partition is ok, add it to the list */
+	if (part_sort_add(dev, part) != 0)
+		return 1;
+
+	return 0;
+}
+
+/**
+ * Parse one partition definition, allocate memory and return pointer to this
+ * location in retpart.
+ *
+ * @param partdef pointer to the partition definition string i.e. <part-def>
+ * @param ret output pointer to next char after parse completes (output)
+ * @param retpart pointer to the allocated partition (output)
+ * @return 0 on success, 1 otherwise
+ */
+static int part_parse(const char *const partdef, const char **ret, struct part_info **retpart)
+{
+	struct part_info *part;
+	unsigned long size;
+	unsigned long offset;
+	const char *name;
+	int name_len;
+	unsigned int mask_flags;
+	const char *p;
+
+	p = partdef;
+	*retpart = NULL;
+	*ret = NULL;
+
+	/* fetch the partition size */
+	if (*p == '-') {
+		/* assign all remaining space to this partition */
+		debug("'-': remaining size assigned\n");
+		size = SIZE_REMAINING;
+		p++;
+	} else {
+		size = memsize_parse(p, &p);
+		if (size < MIN_PART_SIZE) {
+			printf("partition size too small (%lx)\n", size);
+			return 1;
+		}
+	}
+
+	/* check for offset */
+	offset = OFFSET_NOT_SPECIFIED;
+	if (*p == '@') {
+		p++;
+		offset = memsize_parse(p, &p);
+	}
+
+	/* now look for the name */
+	if (*p == '(') {
+		name = ++p;
+		if ((p = strchr(name, ')')) == NULL) {
+			printf("no closing ) found in partition name\n");
+			return 1;
+		}
+		name_len = p - name + 1;
+		if ((name_len - 1) == 0) {
+			printf("empty partition name\n");
+			return 1;
+		}
+		p++;
+	} else {
+		/* 0x00000000@0x00000000 */
+		name_len = 22;
+		name = NULL;
+	}
+
+	/* test for options */
+	mask_flags = 0;
+	if (strncmp(p, "ro", 2) == 0) {
+		mask_flags |= MTD_WRITEABLE_CMD;
+		p += 2;
+	}
+
+	/* check for next partition definition */
+	if (*p == ',') {
+		if (size == SIZE_REMAINING) {
+			*ret = NULL;
+			printf("no partitions allowed after a fill-up partition\n");
+			return 1;
+		}
+		*ret = ++p;
+	} else if ((*p == ';') || (*p == '\0')) {
+		*ret = p;
+	} else {
+		printf("unexpected character '%c' at the end of partition\n", *p);
+		*ret = NULL;
+		return 1;
+	}
+
+	/*  allocate memory */
+	part = (struct part_info *)malloc(sizeof(struct part_info) + name_len);
+	if (!part) {
+		printf("out of memory\n");
+		return 1;
+	}
+	memset(part, 0, sizeof(struct part_info) + name_len);
+	part->size = size;
+	part->offset = offset;
+	part->mask_flags = mask_flags;
+	part->name = (char *)(part + 1);
+
+	if (name) {
+		/* copy user provided name */
+		strncpy(part->name, name, name_len - 1);
+		part->auto_name = 0;
+	} else {
+		/* auto generated name in form of size@offset */
+		sprintf(part->name, "0x%08lx@0x%08lx", size, offset);
+		part->auto_name = 1;
+	}
+
+	part->name[name_len - 1] = '\0';
+	INIT_LIST_HEAD(&part->link);
+
+	debug("+ partition: name %-22s size 0x%08x offset 0x%08x mask flags %d\n",
+			part->name, part->size,
+			part->offset, part->mask_flags);
+
+	*retpart = part;
+	return 0;
+}
+
+/**
+ * Check device number to be within valid range for given device type.
+ *
+ * @param type mtd type
+ * @param num mtd number
+ * @param size a pointer to the size of the mtd device (output)
+ * @return 0 if device is valid, 1 otherwise
+ */
+int mtd_device_validate(u8 type, u8 num, u32 *size)
+{
+	struct mtd_info *mtd = NULL;
+
+	if (get_mtd_info(type, num, &mtd))
+		return 1;
+
+	*size = mtd->size;
+
+	return 0;
+}
+
+/**
+ * Delete all mtd devices from a supplied devices list, free memory allocated for
+ * each device and delete all device partitions.
+ *
+ * @return 0 on success, 1 otherwise
+ */
+static int device_delall(struct list_head *head)
+{
+	struct list_head *entry, *n;
+	struct mtd_device *dev_tmp;
+
+	/* clean devices list */
+	list_for_each_safe(entry, n, head) {
+		dev_tmp = list_entry(entry, struct mtd_device, link);
+		list_del(entry);
+		part_delall(&dev_tmp->parts);
+		free(dev_tmp);
+	}
+	INIT_LIST_HEAD(&devices);
+
+	return 0;
+}
+
+/**
+ * If provided device exists it's partitions are deleted, device is removed
+ * from device list and device memory is freed.
+ *
+ * @param dev device to be deleted
+ * @return 0 on success, 1 otherwise
+ */
+static int device_del(struct mtd_device *dev)
+{
+	part_delall(&dev->parts);
+	list_del(&dev->link);
+	free(dev);
+
+	if (dev == current_mtd_dev) {
+		/* we just deleted current device */
+		if (list_empty(&devices)) {
+			current_mtd_dev = NULL;
+		} else {
+			/* reset first partition from first dev from the
+			 * devices list as current */
+			current_mtd_dev = list_entry(devices.next, struct mtd_device, link);
+			current_mtd_partnum = 0;
+		}
+		current_save();
+		return 0;
+	}
+
+	index_partitions();
+	return 0;
+}
+
+/**
+ * Search global device list and return pointer to the device of type and num
+ * specified.
+ *
+ * @param type device type
+ * @param num device number
+ * @return NULL if requested device does not exist
+ */
+struct mtd_device *device_find(u8 type, u8 num)
+{
+	struct list_head *entry;
+	struct mtd_device *dev_tmp;
+
+	list_for_each(entry, &devices) {
+		dev_tmp = list_entry(entry, struct mtd_device, link);
+
+		if ((dev_tmp->id->type == type) && (dev_tmp->id->num == num))
+			return dev_tmp;
+	}
+
+	return NULL;
+}
+
+/**
+ * Add specified device to the global device list.
+ *
+ * @param dev device to be added
+ */
+static void device_add(struct mtd_device *dev)
+{
+	u8 current_save_needed = 0;
+
+	if (list_empty(&devices)) {
+		current_mtd_dev = dev;
+		current_mtd_partnum = 0;
+		current_save_needed = 1;
+	}
+
+	list_add_tail(&dev->link, &devices);
+
+	if (current_save_needed > 0)
+		current_save();
+	else
+		index_partitions();
+}
+
+/**
+ * Parse device type, name and mtd-id. If syntax is ok allocate memory and
+ * return pointer to the device structure.
+ *
+ * @param mtd_dev pointer to the device definition string i.e. <mtd-dev>
+ * @param ret output pointer to next char after parse completes (output)
+ * @param retdev pointer to the allocated device (output)
+ * @return 0 on success, 1 otherwise
+ */
+static int device_parse(const char *const mtd_dev, const char **ret, struct mtd_device **retdev)
+{
+	struct mtd_device *dev;
+	struct part_info *part;
+	struct mtdids *id;
+	const char *mtd_id;
+	unsigned int mtd_id_len;
+	const char *p, *pend;
+	LIST_HEAD(tmp_list);
+	struct list_head *entry, *n;
+	u16 num_parts;
+	u32 offset;
+	int err = 1;
+
+	debug("===device_parse===\n");
+
+	assert(retdev);
+	*retdev = NULL;
+
+	if (ret)
+		*ret = NULL;
+
+	/* fetch <mtd-id> */
+	mtd_id = p = mtd_dev;
+	if (!(p = strchr(mtd_id, ':'))) {
+		printf("no <mtd-id> identifier\n");
+		return 1;
+	}
+	mtd_id_len = p - mtd_id + 1;
+	p++;
+
+	/* verify if we have a valid device specified */
+	if ((id = id_find_by_mtd_id(mtd_id, mtd_id_len - 1)) == NULL) {
+		printf("invalid mtd device '%.*s'\n", mtd_id_len - 1, mtd_id);
+		return 1;
+	}
+
+	debug("dev type = %d (%s), dev num = %d, mtd-id = %s\n",
+			id->type, MTD_DEV_TYPE(id->type),
+			id->num, id->mtd_id);
+	pend = strchr(p, ';');
+	debug("parsing partitions %.*s\n", (pend ? pend - p : strlen(p)), p);
+
+
+	/* parse partitions */
+	num_parts = 0;
+
+	offset = 0;
+	if ((dev = device_find(id->type, id->num)) != NULL) {
+		/* if device already exists start at the end of the last partition */
+		part = list_entry(dev->parts.prev, struct part_info, link);
+		offset = part->offset + part->size;
+	}
+
+	while (p && (*p != '\0') && (*p != ';')) {
+		err = 1;
+		if ((part_parse(p, &p, &part) != 0) || (!part))
+			break;
+
+		/* calculate offset when not specified */
+		if (part->offset == OFFSET_NOT_SPECIFIED)
+			part->offset = offset;
+		else
+			offset = part->offset;
+
+		/* verify alignment and size */
+		if (part_validate(id, part) != 0)
+			break;
+
+		offset += part->size;
+
+		/* partition is ok, add it to the list */
+		list_add_tail(&part->link, &tmp_list);
+		num_parts++;
+		err = 0;
+	}
+	if (err == 1) {
+		part_delall(&tmp_list);
+		return 1;
+	}
+
+	if (num_parts == 0) {
+		printf("no partitions for device %s%d (%s)\n",
+				MTD_DEV_TYPE(id->type), id->num, id->mtd_id);
+		return 1;
+	}
+
+	debug("\ntotal partitions: %d\n", num_parts);
+
+	/* check for next device presence */
+	if (p) {
+		if (*p == ';') {
+			if (ret)
+				*ret = ++p;
+		} else if (*p == '\0') {
+			if (ret)
+				*ret = p;
+		} else {
+			printf("unexpected character '%c' at the end of device\n", *p);
+			if (ret)
+				*ret = NULL;
+			return 1;
+		}
+	}
+
+	/* allocate memory for mtd_device structure */
+	if ((dev = (struct mtd_device *)malloc(sizeof(struct mtd_device))) == NULL) {
+		printf("out of memory\n");
+		return 1;
+	}
+	memset(dev, 0, sizeof(struct mtd_device));
+	dev->id = id;
+	dev->num_parts = 0; /* part_sort_add increments num_parts */
+	INIT_LIST_HEAD(&dev->parts);
+	INIT_LIST_HEAD(&dev->link);
+
+	/* move partitions from tmp_list to dev->parts */
+	list_for_each_safe(entry, n, &tmp_list) {
+		part = list_entry(entry, struct part_info, link);
+		list_del(entry);
+		if (part_sort_add(dev, part) != 0) {
+			device_del(dev);
+			return 1;
+		}
+	}
+
+	*retdev = dev;
+
+	debug("===\n\n");
+	return 0;
+}
+
+/**
+ * Initialize global device list.
+ *
+ * @return 0 on success, 1 otherwise
+ */
+static int mtd_devices_init(void)
+{
+	last_parts[0] = '\0';
+	current_mtd_dev = NULL;
+	current_save();
+
+	return device_delall(&devices);
+}
+
+/*
+ * Search global mtdids list and find id of requested type and number.
+ *
+ * @return pointer to the id if it exists, NULL otherwise
+ */
+static struct mtdids* id_find(u8 type, u8 num)
+{
+	struct list_head *entry;
+	struct mtdids *id;
+
+	list_for_each(entry, &mtdids) {
+		id = list_entry(entry, struct mtdids, link);
+
+		if ((id->type == type) && (id->num == num))
+			return id;
+	}
+
+	return NULL;
+}
+
+/**
+ * Search global mtdids list and find id of a requested mtd_id.
+ *
+ * Note: first argument is not null terminated.
+ *
+ * @param mtd_id string containing requested mtd_id
+ * @param mtd_id_len length of supplied mtd_id
+ * @return pointer to the id if it exists, NULL otherwise
+ */
+static struct mtdids* id_find_by_mtd_id(const char *mtd_id, unsigned int mtd_id_len)
+{
+	struct list_head *entry;
+	struct mtdids *id;
+
+	debug("--- id_find_by_mtd_id: '%.*s' (len = %d)\n",
+			mtd_id_len, mtd_id, mtd_id_len);
+
+	list_for_each(entry, &mtdids) {
+		id = list_entry(entry, struct mtdids, link);
+
+		debug("entry: '%s' (len = %d)\n",
+				id->mtd_id, strlen(id->mtd_id));
+
+		if (mtd_id_len != strlen(id->mtd_id))
+			continue;
+		if (strncmp(id->mtd_id, mtd_id, mtd_id_len) == 0)
+			return id;
+	}
+
+	return NULL;
+}
+
+/**
+ * Parse device id string <dev-id> := 'nand'|'nor'|'onenand'<dev-num>,
+ * return device type and number.
+ *
+ * @param id string describing device id
+ * @param ret_id output pointer to next char after parse completes (output)
+ * @param dev_type parsed device type (output)
+ * @param dev_num parsed device number (output)
+ * @return 0 on success, 1 otherwise
+ */
+int mtd_id_parse(const char *id, const char **ret_id, u8 *dev_type, u8 *dev_num)
+{
+	const char *p = id;
+
+	*dev_type = 0;
+	if (strncmp(p, "nand", 4) == 0) {
+		*dev_type = MTD_DEV_TYPE_NAND;
+		p += 4;
+	} else if (strncmp(p, "nor", 3) == 0) {
+		*dev_type = MTD_DEV_TYPE_NOR;
+		p += 3;
+	} else if (strncmp(p, "onenand", 7) == 0) {
+		*dev_type = MTD_DEV_TYPE_ONENAND;
+		p += 7;
+	} else {
+		printf("incorrect device type in %s\n", id);
+		return 1;
+	}
+
+	if (!isdigit(*p)) {
+		printf("incorrect device number in %s\n", id);
+		return 1;
+	}
+
+	*dev_num = simple_strtoul(p, (char **)&p, 0);
+	if (ret_id)
+		*ret_id = p;
+	return 0;
+}
+
+/**
+ * Process all devices and generate corresponding mtdparts string describing
+ * all partitions on all devices.
+ *
+ * @param buf output buffer holding generated mtdparts string (output)
+ * @param buflen buffer size
+ * @return 0 on success, 1 otherwise
+ */
+static int generate_mtdparts(char *buf, u32 buflen)
+{
+	struct list_head *pentry, *dentry;
+	struct mtd_device *dev;
+	struct part_info *part, *prev_part;
+	char *p = buf;
+	char tmpbuf[32];
+	u32 size, offset, len, part_cnt;
+	u32 maxlen = buflen - 1;
+
+	debug("--- generate_mtdparts ---\n");
+
+	if (list_empty(&devices)) {
+		buf[0] = '\0';
+		return 0;
+	}
+
+	sprintf(p, "mtdparts=");
+	p += 9;
+
+	list_for_each(dentry, &devices) {
+		dev = list_entry(dentry, struct mtd_device, link);
+
+		/* copy mtd_id */
+		len = strlen(dev->id->mtd_id) + 1;
+		if (len > maxlen)
+			goto cleanup;
+		memcpy(p, dev->id->mtd_id, len - 1);
+		p += len - 1;
+		*(p++) = ':';
+		maxlen -= len;
+
+		/* format partitions */
+		prev_part = NULL;
+		part_cnt = 0;
+		list_for_each(pentry, &dev->parts) {
+			part = list_entry(pentry, struct part_info, link);
+			size = part->size;
+			offset = part->offset;
+			part_cnt++;
+
+			/* partition size */
+			memsize_format(tmpbuf, size);
+			len = strlen(tmpbuf);
+			if (len > maxlen)
+				goto cleanup;
+			memcpy(p, tmpbuf, len);
+			p += len;
+			maxlen -= len;
+
+
+			/* add offset only when there is a gap between
+			 * partitions */
+			if ((!prev_part && (offset != 0)) ||
+					(prev_part && ((prev_part->offset + prev_part->size) != part->offset))) {
+
+				memsize_format(tmpbuf, offset);
+				len = strlen(tmpbuf) + 1;
+				if (len > maxlen)
+					goto cleanup;
+				*(p++) = '@';
+				memcpy(p, tmpbuf, len - 1);
+				p += len - 1;
+				maxlen -= len;
+			}
+
+			/* copy name only if user supplied */
+			if(!part->auto_name) {
+				len = strlen(part->name) + 2;
+				if (len > maxlen)
+					goto cleanup;
+
+				*(p++) = '(';
+				memcpy(p, part->name, len - 2);
+				p += len - 2;
+				*(p++) = ')';
+				maxlen -= len;
+			}
+
+			/* ro mask flag */
+			if (part->mask_flags && MTD_WRITEABLE_CMD) {
+				len = 2;
+				if (len > maxlen)
+					goto cleanup;
+				*(p++) = 'r';
+				*(p++) = 'o';
+				maxlen -= 2;
+			}
+
+			/* print ',' separator if there are other partitions
+			 * following */
+			if (dev->num_parts > part_cnt) {
+				if (1 > maxlen)
+					goto cleanup;
+				*(p++) = ',';
+				maxlen--;
+			}
+			prev_part = part;
+		}
+		/* print ';' separator if there are other devices following */
+		if (dentry->next != &devices) {
+			if (1 > maxlen)
+				goto cleanup;
+			*(p++) = ';';
+			maxlen--;
+		}
+	}
+
+	/* we still have at least one char left, as we decremented maxlen at
+	 * the begining */
+	*p = '\0';
+
+	return 0;
+
+cleanup:
+	last_parts[0] = '\0';
+	return 1;
+}
+
+/**
+ * Call generate_mtdparts to process all devices and generate corresponding
+ * mtdparts string, save it in mtdparts environment variable.
+ *
+ * @param buf output buffer holding generated mtdparts string (output)
+ * @param buflen buffer size
+ * @return 0 on success, 1 otherwise
+ */
+static int generate_mtdparts_save(char *buf, u32 buflen)
+{
+	int ret;
+
+	ret = generate_mtdparts(buf, buflen);
+
+	if ((buf[0] != '\0') && (ret == 0))
+		setenv("mtdparts", buf);
+	else
+		setenv("mtdparts", NULL);
+
+	return ret;
+}
+
+#if defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES)
+/**
+ * Get the net size (w/o bad blocks) of the given partition.
+ *
+ * @param mtd the mtd info
+ * @param part the partition
+ * @return the calculated net size of this partition
+ */
+static uint64_t net_part_size(struct mtd_info *mtd, struct part_info *part)
+{
+	uint64_t i, net_size = 0;
+
+	if (!mtd->block_isbad)
+		return part->size;
+
+	for (i = 0; i < part->size; i += mtd->erasesize) {
+		if (!mtd->block_isbad(mtd, part->offset + i))
+			net_size += mtd->erasesize;
+	}
+
+	return net_size;
+}
+#endif
+
+static void print_partition_table(void)
+{
+	struct list_head *dentry, *pentry;
+	struct part_info *part;
+	struct mtd_device *dev;
+	int part_num;
+
+	list_for_each(dentry, &devices) {
+		dev = list_entry(dentry, struct mtd_device, link);
+		/* list partitions for given device */
+		part_num = 0;
+#if defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES)
+		struct mtd_info *mtd;
+
+		if (get_mtd_info(dev->id->type, dev->id->num, &mtd))
+			return;
+
+		printf("\ndevice %s%d <%s>, # parts = %d\n",
+				MTD_DEV_TYPE(dev->id->type), dev->id->num,
+				dev->id->mtd_id, dev->num_parts);
+		printf(" #: name\t\tsize\t\tnet size\toffset\t\tmask_flags\n");
+
+		list_for_each(pentry, &dev->parts) {
+			u32 net_size;
+			char *size_note;
+
+			part = list_entry(pentry, struct part_info, link);
+			net_size = net_part_size(mtd, part);
+			size_note = part->size == net_size ? " " : " (!)";
+			printf("%2d: %-20s0x%08x\t0x%08x%s\t0x%08x\t%d\n",
+					part_num, part->name, part->size,
+					net_size, size_note, part->offset,
+					part->mask_flags);
+#else /* !defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) */
+		printf("\ndevice %s%d <%s>, # parts = %d\n",
+				MTD_DEV_TYPE(dev->id->type), dev->id->num,
+				dev->id->mtd_id, dev->num_parts);
+		printf(" #: name\t\tsize\t\toffset\t\tmask_flags\n");
+
+		list_for_each(pentry, &dev->parts) {
+			part = list_entry(pentry, struct part_info, link);
+			printf("%2d: %-20s0x%08x\t0x%08x\t%d\n",
+					part_num, part->name, part->size,
+					part->offset, part->mask_flags);
+#endif /* defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) */
+			part_num++;
+		}
+	}
+
+	if (list_empty(&devices))
+		printf("no partitions defined\n");
+}
+
+/**
+ * Format and print out a partition list for each device from global device
+ * list.
+ */
+static void list_partitions(void)
+{
+	struct part_info *part;
+
+	debug("\n---list_partitions---\n");
+	print_partition_table();
+
+	/* current_mtd_dev is not NULL only when we have non empty device list */
+	if (current_mtd_dev) {
+		part = mtd_part_info(current_mtd_dev, current_mtd_partnum);
+		if (part) {
+			printf("\nactive partition: %s%d,%d - (%s) 0x%08x @ 0x%08x\n",
+					MTD_DEV_TYPE(current_mtd_dev->id->type),
+					current_mtd_dev->id->num, current_mtd_partnum,
+					part->name, part->size, part->offset);
+		} else {
+			printf("could not get current partition info\n\n");
+		}
+	}
+
+	printf("\ndefaults:\n");
+	printf("mtdids  : %s\n",
+		mtdids_default ? mtdids_default : "none");
+	/*
+	 * Using printf() here results in printbuffer overflow
+	 * if default mtdparts string is greater than console
+	 * printbuffer. Use puts() to prevent system crashes.
+	 */
+	puts("mtdparts: ");
+	puts(mtdparts_default ? mtdparts_default : "none");
+	puts("\n");
+}
+
+/**
+ * Given partition identifier in form of <dev_type><dev_num>,<part_num> find
+ * corresponding device and verify partition number.
+ *
+ * @param id string describing device and partition or partition name
+ * @param dev pointer to the requested device (output)
+ * @param part_num verified partition number (output)
+ * @param part pointer to requested partition (output)
+ * @return 0 on success, 1 otherwise
+ */
+int find_dev_and_part(const char *id, struct mtd_device **dev,
+		u8 *part_num, struct part_info **part)
+{
+	struct list_head *dentry, *pentry;
+	u8 type, dnum, pnum;
+	const char *p;
+
+	debug("--- find_dev_and_part ---\nid = %s\n", id);
+
+	list_for_each(dentry, &devices) {
+		*part_num = 0;
+		*dev = list_entry(dentry, struct mtd_device, link);
+		list_for_each(pentry, &(*dev)->parts) {
+			*part = list_entry(pentry, struct part_info, link);
+			if (strcmp((*part)->name, id) == 0)
+				return 0;
+			(*part_num)++;
+		}
+	}
+
+	p = id;
+	*dev = NULL;
+	*part = NULL;
+	*part_num = 0;
+
+	if (mtd_id_parse(p, &p, &type, &dnum) != 0)
+		return 1;
+
+	if ((*p++ != ',') || (*p == '\0')) {
+		printf("no partition number specified\n");
+		return 1;
+	}
+	pnum = simple_strtoul(p, (char **)&p, 0);
+	if (*p != '\0') {
+		printf("unexpected trailing character '%c'\n", *p);
+		return 1;
+	}
+
+	if ((*dev = device_find(type, dnum)) == NULL) {
+		printf("no such device %s%d\n", MTD_DEV_TYPE(type), dnum);
+		return 1;
+	}
+
+	if ((*part = mtd_part_info(*dev, pnum)) == NULL) {
+		printf("no such partition\n");
+		*dev = NULL;
+		return 1;
+	}
+
+	*part_num = pnum;
+
+	return 0;
+}
+
+/**
+ * Find and delete partition. For partition id format see find_dev_and_part().
+ *
+ * @param id string describing device and partition
+ * @return 0 on success, 1 otherwise
+ */
+static int delete_partition(const char *id)
+{
+	u8 pnum;
+	struct mtd_device *dev;
+	struct part_info *part;
+
+	if (find_dev_and_part(id, &dev, &pnum, &part) == 0) {
+
+		debug("delete_partition: device = %s%d, partition %d = (%s) 0x%08x@0x%08x\n",
+				MTD_DEV_TYPE(dev->id->type), dev->id->num, pnum,
+				part->name, part->size, part->offset);
+
+		if (part_del(dev, part) != 0)
+			return 1;
+
+		if (generate_mtdparts_save(last_parts, MTDPARTS_MAXLEN) != 0) {
+			printf("generated mtdparts too long, reseting to null\n");
+			return 1;
+		}
+		return 0;
+	}
+
+	printf("partition %s not found\n", id);
+	return 1;
+}
+
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+/**
+ * Increase the size of the given partition so that it's net size is at least
+ * as large as the size member and such that the next partition would start on a
+ * good block if it were adjacent to this partition.
+ *
+ * @param mtd the mtd device
+ * @param part the partition
+ * @param next_offset pointer to the offset of the next partition after this
+ *                    partition's size has been modified (output)
+ */
+static void spread_partition(struct mtd_info *mtd, struct part_info *part,
+			     uint64_t *next_offset)
+{
+	uint64_t net_size, padding_size = 0;
+	int truncated;
+
+	mtd_get_len_incl_bad(mtd, part->offset, part->size, &net_size,
+			     &truncated);
+
+	/*
+	 * Absorb bad blocks immediately following this
+	 * partition also into the partition, such that
+	 * the next partition starts with a good block.
+	 */
+	if (!truncated) {
+		mtd_get_len_incl_bad(mtd, part->offset + net_size,
+				     mtd->erasesize, &padding_size, &truncated);
+		if (truncated)
+			padding_size = 0;
+		else
+			padding_size -= mtd->erasesize;
+	}
+
+	if (truncated) {
+		printf("truncated partition %s to %lld bytes\n", part->name,
+		       (uint64_t) net_size + padding_size);
+	}
+
+	part->size = net_size + padding_size;
+	*next_offset = part->offset + part->size;
+}
+
+/**
+ * Adjust all of the partition sizes, such that all partitions are at least
+ * as big as their mtdparts environment variable sizes and they each start
+ * on a good block.
+ *
+ * @return 0 on success, 1 otherwise
+ */
+static int spread_partitions(void)
+{
+	struct list_head *dentry, *pentry;
+	struct mtd_device *dev;
+	struct part_info *part;
+	struct mtd_info *mtd;
+	int part_num;
+	uint64_t cur_offs;
+
+	list_for_each(dentry, &devices) {
+		dev = list_entry(dentry, struct mtd_device, link);
+
+		if (get_mtd_info(dev->id->type, dev->id->num, &mtd))
+			return 1;
+
+		part_num = 0;
+		cur_offs = 0;
+		list_for_each(pentry, &dev->parts) {
+			part = list_entry(pentry, struct part_info, link);
+
+			debug("spread_partitions: device = %s%d, partition %d ="
+				" (%s) 0x%08x@0x%08x\n",
+				MTD_DEV_TYPE(dev->id->type), dev->id->num,
+				part_num, part->name, part->size,
+				part->offset);
+
+			if (cur_offs > part->offset)
+				part->offset = cur_offs;
+
+			spread_partition(mtd, part, &cur_offs);
+
+			part_num++;
+		}
+	}
+
+	index_partitions();
+
+	if (generate_mtdparts_save(last_parts, MTDPARTS_MAXLEN) != 0) {
+		printf("generated mtdparts too long, reseting to null\n");
+		return 1;
+	}
+	return 0;
+}
+#endif /* CONFIG_CMD_MTDPARTS_SPREAD */
+
+/**
+ * Accept character string describing mtd partitions and call device_parse()
+ * for each entry. Add created devices to the global devices list.
+ *
+ * @param mtdparts string specifing mtd partitions
+ * @return 0 on success, 1 otherwise
+ */
+static int parse_mtdparts(const char *const mtdparts)
+{
+	const char *p = mtdparts;
+	struct mtd_device *dev;
+	int err = 1;
+
+	debug("\n---parse_mtdparts---\nmtdparts = %s\n\n", p);
+
+	/* delete all devices and partitions */
+	if (mtd_devices_init() != 0) {
+		printf("could not initialise device list\n");
+		return err;
+	}
+
+	/* re-read 'mtdparts' variable, mtd_devices_init may be updating env */
+	p = getenv("mtdparts");
+
+	if (strncmp(p, "mtdparts=", 9) != 0) {
+		printf("mtdparts variable doesn't start with 'mtdparts='\n");
+		return err;
+	}
+	p += 9;
+
+	while (p && (*p != '\0')) {
+		err = 1;
+		if ((device_parse(p, &p, &dev) != 0) || (!dev))
+			break;
+
+		debug("+ device: %s\t%d\t%s\n", MTD_DEV_TYPE(dev->id->type),
+				dev->id->num, dev->id->mtd_id);
+
+		/* check if parsed device is already on the list */
+		if (device_find(dev->id->type, dev->id->num) != NULL) {
+			printf("device %s%d redefined, please correct mtdparts variable\n",
+					MTD_DEV_TYPE(dev->id->type), dev->id->num);
+			break;
+		}
+
+		list_add_tail(&dev->link, &devices);
+		err = 0;
+	}
+	if (err == 1) {
+		device_delall(&devices);
+		return 1;
+	}
+
+	return 0;
+}
+
+/**
+ * Parse provided string describing mtdids mapping (see file header for mtdids
+ * variable format). Allocate memory for each entry and add all found entries
+ * to the global mtdids list.
+ *
+ * @param ids mapping string
+ * @return 0 on success, 1 otherwise
+ */
+static int parse_mtdids(const char *const ids)
+{
+	const char *p = ids;
+	const char *mtd_id;
+	int mtd_id_len;
+	struct mtdids *id;
+	struct list_head *entry, *n;
+	struct mtdids *id_tmp;
+	u8 type, num;
+	u32 size;
+	int ret = 1;
+
+	debug("\n---parse_mtdids---\nmtdids = %s\n\n", ids);
+
+	/* clean global mtdids list */
+	list_for_each_safe(entry, n, &mtdids) {
+		id_tmp = list_entry(entry, struct mtdids, link);
+		debug("mtdids del: %d %d\n", id_tmp->type, id_tmp->num);
+		list_del(entry);
+		free(id_tmp);
+	}
+	last_ids[0] = '\0';
+	INIT_LIST_HEAD(&mtdids);
+
+	while(p && (*p != '\0')) {
+
+		ret = 1;
+		/* parse 'nor'|'nand'|'onenand'<dev-num> */
+		if (mtd_id_parse(p, &p, &type, &num) != 0)
+			break;
+
+		if (*p != '=') {
+			printf("mtdids: incorrect <dev-num>\n");
+			break;
+		}
+		p++;
+
+		/* check if requested device exists */
+		if (mtd_device_validate(type, num, &size) != 0)
+			return 1;
+
+		/* locate <mtd-id> */
+		mtd_id = p;
+		if ((p = strchr(mtd_id, ',')) != NULL) {
+			mtd_id_len = p - mtd_id + 1;
+			p++;
+		} else {
+			mtd_id_len = strlen(mtd_id) + 1;
+		}
+		if (mtd_id_len == 0) {
+			printf("mtdids: no <mtd-id> identifier\n");
+			break;
+		}
+
+		/* check if this id is already on the list */
+		int double_entry = 0;
+		list_for_each(entry, &mtdids) {
+			id_tmp = list_entry(entry, struct mtdids, link);
+			if ((id_tmp->type == type) && (id_tmp->num == num)) {
+				double_entry = 1;
+				break;
+			}
+		}
+		if (double_entry) {
+			printf("device id %s%d redefined, please correct mtdids variable\n",
+					MTD_DEV_TYPE(type), num);
+			break;
+		}
+
+		/* allocate mtdids structure */
+		if (!(id = (struct mtdids *)malloc(sizeof(struct mtdids) + mtd_id_len))) {
+			printf("out of memory\n");
+			break;
+		}
+		memset(id, 0, sizeof(struct mtdids) + mtd_id_len);
+		id->num = num;
+		id->type = type;
+		id->size = size;
+		id->mtd_id = (char *)(id + 1);
+		strncpy(id->mtd_id, mtd_id, mtd_id_len - 1);
+		id->mtd_id[mtd_id_len - 1] = '\0';
+		INIT_LIST_HEAD(&id->link);
+
+		debug("+ id %s%d\t%16d bytes\t%s\n",
+				MTD_DEV_TYPE(id->type), id->num,
+				id->size, id->mtd_id);
+
+		list_add_tail(&id->link, &mtdids);
+		ret = 0;
+	}
+	if (ret == 1) {
+		/* clean mtdids list and free allocated memory */
+		list_for_each_safe(entry, n, &mtdids) {
+			id_tmp = list_entry(entry, struct mtdids, link);
+			list_del(entry);
+			free(id_tmp);
+		}
+		return 1;
+	}
+
+	return 0;
+}
+
+/**
+ * Parse and initialize global mtdids mapping and create global
+ * device/partition list.
+ *
+ * @return 0 on success, 1 otherwise
+ */
+int mtdparts_init(void)
+{
+	static int initialized = 0;
+	const char *ids, *parts;
+	const char *current_partition;
+	int ids_changed;
+	char tmp_ep[PARTITION_MAXLEN];
+
+	debug("\n---mtdparts_init---\n");
+	if (!initialized) {
+		INIT_LIST_HEAD(&mtdids);
+		INIT_LIST_HEAD(&devices);
+		memset(last_ids, 0, MTDIDS_MAXLEN);
+		memset(last_parts, 0, MTDPARTS_MAXLEN);
+		memset(last_partition, 0, PARTITION_MAXLEN);
+		initialized = 1;
+	}
+
+	/* get variables */
+	ids = getenv("mtdids");
+	parts = getenv("mtdparts");
+	current_partition = getenv("partition");
+
+	/* save it for later parsing, cannot rely on current partition pointer
+	 * as 'partition' variable may be updated during init */
+	tmp_ep[0] = '\0';
+	if (current_partition)
+		strncpy(tmp_ep, current_partition, PARTITION_MAXLEN);
+
+	debug("last_ids  : %s\n", last_ids);
+	debug("env_ids   : %s\n", ids);
+	debug("last_parts: %s\n", last_parts);
+	debug("env_parts : %s\n\n", parts);
+
+	debug("last_partition : %s\n", last_partition);
+	debug("env_partition  : %s\n", current_partition);
+
+	/* if mtdids varible is empty try to use defaults */
+	if (!ids) {
+		if (mtdids_default) {
+			debug("mtdids variable not defined, using default\n");
+			ids = mtdids_default;
+			setenv("mtdids", (char *)ids);
+		} else {
+			printf("mtdids not defined, no default present\n");
+			return 1;
+		}
+	}
+	if (strlen(ids) > MTDIDS_MAXLEN - 1) {
+		printf("mtdids too long (> %d)\n", MTDIDS_MAXLEN);
+		return 1;
+	}
+
+	/* do no try to use defaults when mtdparts variable is not defined,
+	 * just check the length */
+	if (!parts)
+		printf("mtdparts variable not set, see 'help mtdparts'\n");
+
+	if (parts && (strlen(parts) > MTDPARTS_MAXLEN - 1)) {
+		printf("mtdparts too long (> %d)\n", MTDPARTS_MAXLEN);
+		return 1;
+	}
+
+	/* check if we have already parsed those mtdids */
+	if ((last_ids[0] != '\0') && (strcmp(last_ids, ids) == 0)) {
+		ids_changed = 0;
+	} else {
+		ids_changed = 1;
+
+		if (parse_mtdids(ids) != 0) {
+			mtd_devices_init();
+			return 1;
+		}
+
+		/* ok it's good, save new ids */
+		strncpy(last_ids, ids, MTDIDS_MAXLEN);
+	}
+
+	/* parse partitions if either mtdparts or mtdids were updated */
+	if (parts && ((last_parts[0] == '\0') || ((strcmp(last_parts, parts) != 0)) || ids_changed)) {
+		if (parse_mtdparts(parts) != 0)
+			return 1;
+
+		if (list_empty(&devices)) {
+			printf("mtdparts_init: no valid partitions\n");
+			return 1;
+		}
+
+		/* ok it's good, save new parts */
+		strncpy(last_parts, parts, MTDPARTS_MAXLEN);
+
+		/* reset first partition from first dev from the list as current */
+		current_mtd_dev = list_entry(devices.next, struct mtd_device, link);
+		current_mtd_partnum = 0;
+		current_save();
+
+		debug("mtdparts_init: current_mtd_dev  = %s%d, current_mtd_partnum = %d\n",
+				MTD_DEV_TYPE(current_mtd_dev->id->type),
+				current_mtd_dev->id->num, current_mtd_partnum);
+	}
+
+	/* mtdparts variable was reset to NULL, delete all devices/partitions */
+	if (!parts && (last_parts[0] != '\0'))
+		return mtd_devices_init();
+
+	/* do not process current partition if mtdparts variable is null */
+	if (!parts)
+		return 0;
+
+	/* is current partition set in environment? if so, use it */
+	if ((tmp_ep[0] != '\0') && (strcmp(tmp_ep, last_partition) != 0)) {
+		struct part_info *p;
+		struct mtd_device *cdev;
+		u8 pnum;
+
+		debug("--- getting current partition: %s\n", tmp_ep);
+
+		if (find_dev_and_part(tmp_ep, &cdev, &pnum, &p) == 0) {
+			current_mtd_dev = cdev;
+			current_mtd_partnum = pnum;
+			current_save();
+		}
+	} else if (getenv("partition") == NULL) {
+		debug("no partition variable set, setting...\n");
+		current_save();
+	}
+
+	return 0;
+}
+
+/**
+ * Return pointer to the partition of a requested number from a requested
+ * device.
+ *
+ * @param dev device that is to be searched for a partition
+ * @param part_num requested partition number
+ * @return pointer to the part_info, NULL otherwise
+ */
+static struct part_info* mtd_part_info(struct mtd_device *dev, unsigned int part_num)
+{
+	struct list_head *entry;
+	struct part_info *part;
+	int num;
+
+	if (!dev)
+		return NULL;
+
+	debug("\n--- mtd_part_info: partition number %d for device %s%d (%s)\n",
+			part_num, MTD_DEV_TYPE(dev->id->type),
+			dev->id->num, dev->id->mtd_id);
+
+	if (part_num >= dev->num_parts) {
+		printf("invalid partition number %d for device %s%d (%s)\n",
+				part_num, MTD_DEV_TYPE(dev->id->type),
+				dev->id->num, dev->id->mtd_id);
+		return NULL;
+	}
+
+	/* locate partition number, return it */
+	num = 0;
+	list_for_each(entry, &dev->parts) {
+		part = list_entry(entry, struct part_info, link);
+
+		if (part_num == num++) {
+			return part;
+		}
+	}
+
+	return NULL;
+}
+
+/***************************************************/
+/* U-boot commands				   */
+/***************************************************/
+/* command line only */
+/**
+ * Routine implementing u-boot chpart command. Sets new current partition based
+ * on the user supplied partition id. For partition id format see find_dev_and_part().
+ *
+ * @param cmdtp command internal data
+ * @param flag command flag
+ * @param argc number of arguments supplied to the command
+ * @param argv arguments list
+ * @return 0 on success, 1 otherwise
+ */
+int do_chpart(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+/* command line only */
+	struct mtd_device *dev;
+	struct part_info *part;
+	u8 pnum;
+
+	if (mtdparts_init() !=0)
+		return 1;
+
+	if (argc < 2) {
+		printf("no partition id specified\n");
+		return 1;
+	}
+
+	if (find_dev_and_part(argv[1], &dev, &pnum, &part) != 0)
+		return 1;
+
+	current_mtd_dev = dev;
+	current_mtd_partnum = pnum;
+	current_save();
+
+	printf("partition changed to %s%d,%d\n",
+			MTD_DEV_TYPE(dev->id->type), dev->id->num, pnum);
+
+	return 0;
+}
+
+/**
+ * Routine implementing u-boot mtdparts command. Initialize/update default global
+ * partition list and process user partition request (list, add, del).
+ *
+ * @param cmdtp command internal data
+ * @param flag command flag
+ * @param argc number of arguments supplied to the command
+ * @param argv arguments list
+ * @return 0 on success, 1 otherwise
+ */
+int do_mtdparts(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	if (argc == 2) {
+		if (strcmp(argv[1], "default") == 0) {
+			setenv("mtdids", (char *)mtdids_default);
+			setenv("mtdparts", (char *)mtdparts_default);
+			setenv("partition", NULL);
+
+			mtdparts_init();
+			return 0;
+		} else if (strcmp(argv[1], "delall") == 0) {
+			/* this may be the first run, initialize lists if needed */
+			mtdparts_init();
+
+			setenv("mtdparts", NULL);
+
+			/* mtd_devices_init() calls current_save() */
+			return mtd_devices_init();
+		}
+	}
+
+	/* make sure we are in sync with env variables */
+	if (mtdparts_init() != 0)
+		return 1;
+
+	if (argc == 1) {
+		list_partitions();
+		return 0;
+	}
+
+	/* mtdparts add <mtd-dev> <size>[@<offset>] <name> [ro] */
+	if (((argc == 5) || (argc == 6)) && (strncmp(argv[1], "add", 3) == 0)) {
+#define PART_ADD_DESC_MAXLEN 64
+		char tmpbuf[PART_ADD_DESC_MAXLEN];
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+		struct mtd_info *mtd;
+		uint64_t next_offset;
+#endif
+		u8 type, num, len;
+		struct mtd_device *dev;
+		struct mtd_device *dev_tmp;
+		struct mtdids *id;
+		struct part_info *p;
+
+		if (mtd_id_parse(argv[2], NULL, &type, &num) != 0)
+			return 1;
+
+		if ((id = id_find(type, num)) == NULL) {
+			printf("no such device %s defined in mtdids variable\n", argv[2]);
+			return 1;
+		}
+
+		len = strlen(id->mtd_id) + 1;	/* 'mtd_id:' */
+		len += strlen(argv[3]);		/* size@offset */
+		len += strlen(argv[4]) + 2;	/* '(' name ')' */
+		if (argv[5] && (strlen(argv[5]) == 2))
+			len += 2;		/* 'ro' */
+
+		if (len >= PART_ADD_DESC_MAXLEN) {
+			printf("too long partition description\n");
+			return 1;
+		}
+		sprintf(tmpbuf, "%s:%s(%s)%s",
+				id->mtd_id, argv[3], argv[4], argv[5] ? argv[5] : "");
+		debug("add tmpbuf: %s\n", tmpbuf);
+
+		if ((device_parse(tmpbuf, NULL, &dev) != 0) || (!dev))
+			return 1;
+
+		debug("+ %s\t%d\t%s\n", MTD_DEV_TYPE(dev->id->type),
+				dev->id->num, dev->id->mtd_id);
+
+		p = list_entry(dev->parts.next, struct part_info, link);
+
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+		if (get_mtd_info(dev->id->type, dev->id->num, &mtd))
+			return 1;
+
+		if (!strcmp(&argv[1][3], ".spread")) {
+			spread_partition(mtd, p, &next_offset);
+			debug("increased %s to %d bytes\n", p->name, p->size);
+		}
+#endif
+
+		dev_tmp = device_find(dev->id->type, dev->id->num);
+		if (dev_tmp == NULL) {
+			device_add(dev);
+		} else if (part_add(dev_tmp, p) != 0) {
+			/* merge new partition with existing ones*/
+			device_del(dev);
+			return 1;
+		}
+
+		if (generate_mtdparts_save(last_parts, MTDPARTS_MAXLEN) != 0) {
+			printf("generated mtdparts too long, reseting to null\n");
+			return 1;
+		}
+
+		return 0;
+	}
+
+	/* mtdparts del part-id */
+	if ((argc == 3) && (strcmp(argv[1], "del") == 0)) {
+		debug("del: part-id = %s\n", argv[2]);
+
+		return delete_partition(argv[2]);
+	}
+
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+	if ((argc == 2) && (strcmp(argv[1], "spread") == 0))
+		return spread_partitions();
+#endif /* CONFIG_CMD_MTDPARTS_SPREAD */
+
+	return cmd_usage(cmdtp);
+}
+
+/***************************************************/
+U_BOOT_CMD(
+	chpart,	2,	0,	do_chpart,
+	"change active partition",
+	"part-id\n"
+	"    - change active partition (e.g. part-id = nand0,1)"
+);
+
+U_BOOT_CMD(
+	mtdparts,	6,	0,	do_mtdparts,
+	"define flash/nand partitions",
+	"\n"
+	"    - list partition table\n"
+	"mtdparts delall\n"
+	"    - delete all partitions\n"
+	"mtdparts del part-id\n"
+	"    - delete partition (e.g. part-id = nand0,1)\n"
+	"mtdparts add <mtd-dev> <size>[@<offset>] [<name>] [ro]\n"
+	"    - add partition\n"
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+	"mtdparts add.spread <mtd-dev> <size>[@<offset>] [<name>] [ro]\n"
+	"    - add partition, padding size by skipping bad blocks\n"
+#endif
+	"mtdparts default\n"
+	"    - reset partition table to defaults\n"
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+	"mtdparts spread\n"
+	"    - adjust the sizes of the partitions so they are\n"
+	"      at least as big as the mtdparts variable specifies\n"
+	"      and they each start on a good block\n\n"
+#else
+	"\n"
+#endif /* CONFIG_CMD_MTDPARTS_SPREAD */
+	"-----\n\n"
+	"this command uses three environment variables:\n\n"
+	"'partition' - keeps current partition identifier\n\n"
+	"partition  := <part-id>\n"
+	"<part-id>  := <dev-id>,part_num\n\n"
+	"'mtdids' - linux kernel mtd device id <-> u-boot device id mapping\n\n"
+	"mtdids=<idmap>[,<idmap>,...]\n\n"
+	"<idmap>    := <dev-id>=<mtd-id>\n"
+	"<dev-id>   := 'nand'|'nor'|'onenand'<dev-num>\n"
+	"<dev-num>  := mtd device number, 0...\n"
+	"<mtd-id>   := unique device tag used by linux kernel to find mtd device (mtd->name)\n\n"
+	"'mtdparts' - partition list\n\n"
+	"mtdparts=mtdparts=<mtd-def>[;<mtd-def>...]\n\n"
+	"<mtd-def>  := <mtd-id>:<part-def>[,<part-def>...]\n"
+	"<mtd-id>   := unique device tag used by linux kernel to find mtd device (mtd->name)\n"
+	"<part-def> := <size>[@<offset>][<name>][<ro-flag>]\n"
+	"<size>     := standard linux memsize OR '-' to denote all remaining space\n"
+	"<offset>   := partition start offset within the device\n"
+	"<name>     := '(' NAME ')'\n"
+	"<ro-flag>  := when set to 'ro' makes partition read-only (not used, passed to kernel)"
+);
+/***************************************************/