/*
   * (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
   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  /*
   * 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

  DECLARE_GLOBAL_DATA_PTR;

  /* special size referring to all the remaining space in a partition */

  #define SIZE_REMAINING		(~0llu)

  
  /* 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	(~0llu)

  
  /* 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() */

  static struct list_head mtdids;

  
  /* device/partition list, parse_cmdline() parses into here */

  static 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 u64 memsize_parse (const char *const ptr, const char **retptr)

  {

  	u64 ret = simple_strtoull(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, u64 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, "%llug", size/SIZE_GB);

  	else if ((size % SIZE_MB) == 0)

  		sprintf(buf, "%llum", size/SIZE_MB);

  	else if (size % SIZE_KB == 0)

  		sprintf(buf, "%lluk", size/SIZE_KB);

  	else

  		sprintf(buf, "%llu", 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)
  {

  	u16 mtddevnum;
  	struct part_info *part;
  	struct list_head *dentry;
  	struct mtd_device *dev;

  	debug("--- index partitions ---
  ");

  	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;

  				setenv_ulong("mtddevnum", mtddevnum);

  				break;
  			}
  			mtddevnum += dev->num_parts;
  		}

  		part = mtd_part_info(current_mtd_dev, current_mtd_partnum);

  		setenv("mtddevname", part->name);

  		debug("=> mtddevnum %d,
  => mtddevname %s
  ", mtddevnum, part->name);

  	} else {
  		setenv("mtddevnum", NULL);
  		setenv("mtddevname", NULL);

  		debug("=> mtddevnum NULL
  => mtddevname NULL
  ");

  	}
  }
  
  /**
   * Save current device and partition in environment variable 'partition'.
   */
  static void current_save(void)
  {
  	char buf[16];

  	debug("--- current_save ---
  ");

  	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
  ", buf);

  	} else {
  		setenv("partition", NULL);
  		last_partition[0] = '\0';

  		debug("=> partition NULL
  ");

  	}
  	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!
  ", mtd_dev);
  		return 1;
  	}

  	put_mtd_device(*mtd);

  
  	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;

  	u64 offset, size;

  	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
  		 */

  		offset = part->offset;
  		if (do_div(offset, mtd->erasesize)) {

  			printf("%s%d: partition (%s) start offset"
  			       "alignment incorrect
  ",
  			       MTD_DEV_TYPE(id->type), id->num, part->name);
  			return 1;
  		}

  		size = part->size;
  		if (do_div(size, mtd->erasesize)) {

  			printf("%s%d: partition (%s) size alignment incorrect
  ",
  			       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
  ",

  		       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
  ",

  		       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
   * part_validate_eraseblock() 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 %08llx beyond flash size %08llx
  ",

  				id->mtd_id, part->offset, id->size);
  		return 1;
  	}
  
  	if ((part->offset + part->size) <= part->offset) {
  		printf("%s%d: partition (%s) size too big
  ",
  				MTD_DEV_TYPE(id->type), id->num, part->name);
  		return 1;
  	}
  
  	if (part->offset + part->size > id->size) {
  		printf("%s: partitioning exceeds flash size
  ", 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 partition 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
  ");

  				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
  ");

  		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
  ");
  			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;

  	u64 size;
  	u64 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
  ");

  		size = SIZE_REMAINING;
  		p++;
  	} else {
  		size = memsize_parse(p, &p);
  		if (size < MIN_PART_SIZE) {

  			printf("partition size too small (%llx)
  ", 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
  ");
  			return 1;
  		}
  		name_len = p - name + 1;
  		if ((name_len - 1) == 0) {
  			printf("empty partition name
  ");
  			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
  ");
  			return 1;
  		}
  		*ret = ++p;
  	} else if ((*p == ';') || (*p == '\0')) {
  		*ret = p;
  	} else {
  		printf("unexpected character '%c' at the end of partition
  ", *p);
  		*ret = NULL;
  		return 1;
  	}
  
  	/*  allocate memory */
  	part = (struct part_info *)malloc(sizeof(struct part_info) + name_len);
  	if (!part) {
  		printf("out of memory
  ");
  		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%08llx@0x%08llx", size, offset);

  		part->auto_name = 1;
  	}
  
  	part->name[name_len - 1] = '\0';
  	INIT_LIST_HEAD(&part->link);

  	debug("+ partition: name %-22s size 0x%08llx offset 0x%08llx mask flags %d
  ",

  			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
   */

  static int mtd_device_validate(u8 type, u8 num, u64 *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;

  	const char *pend;

  	LIST_HEAD(tmp_list);
  	struct list_head *entry, *n;
  	u16 num_parts;

  	u64 offset;

  	int err = 1;

  	debug("===device_parse===
  ");

  
  	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
  ");
  		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'
  ", mtd_id_len - 1, mtd_id);
  		return 1;
  	}

  #ifdef DEBUG
  	pend = strchr(p, ';');
  #endif

  	debug("dev type = %d (%s), dev num = %d, mtd-id = %s
  ",

  			id->type, MTD_DEV_TYPE(id->type),
  			id->num, id->mtd_id);

  	debug("parsing partitions %.*s
  ", (int)(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)
  ",
  				MTD_DEV_TYPE(id->type), id->num, id->mtd_id);
  		return 1;
  	}

  	debug("
  total partitions: %d
  ", 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
  ", *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
  ");
  		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("===
  
  ");

  	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)
  ",

  			mtd_id_len, mtd_id, mtd_id_len);
  
  	list_for_each(entry, &mtdids) {
  		id = list_entry(entry, struct mtdids, link);

  		debug("entry: '%s' (len = %zu)
  ",

  				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
  ", id);
  		return 1;
  	}
  
  	if (!isdigit(*p)) {
  		printf("incorrect device number in %s
  ", 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];

  	u64 size, offset;
  	u32 len, part_cnt;

  	u32 maxlen = buflen - 1;

  	debug("--- generate_mtdparts ---
  ");

  
  	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("
  device %s%d <%s>, # parts = %d
  ",
  				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
  ");
  
  		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
  ",
  					part_num, part->name, part->size,
  					net_size, size_note, part->offset,
  					part->mask_flags);
  #else /* !defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) */

  		printf("
  device %s%d <%s>, # parts = %d
  ",
  				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
  ");

  		list_for_each(pentry, &dev->parts) {
  			part = list_entry(pentry, struct part_info, link);

  			printf("%2d: %-20s0x%08llx\t0x%08llx\t%d
  ",

  					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
  ");

  }
  
  /**
   * Format and print out a partition list for each device from global device
   * list.
   */
  static void list_partitions(void)
  {
  	struct part_info *part;
  
  	debug("
  ---list_partitions---
  ");
  	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("
  active partition: %s%d,%d - (%s) 0x%08llx @ 0x%08llx
  ",

  					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
  
  ");
  		}
  	}
  
  	printf("
  defaults:
  ");

  	printf("mtdids  : %s
  ",
  		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("
  ");

  }
  
  /**
   * 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 ---
  id = %s
  ", 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
  ");
  		return 1;
  	}
  	pnum = simple_strtoul(p, (char **)&p, 0);
  	if (*p != '\0') {
  		printf("unexpected trailing character '%c'
  ", *p);
  		return 1;
  	}
  
  	if ((*dev = device_find(type, dnum)) == NULL) {
  		printf("no such device %s%d
  ", MTD_DEV_TYPE(type), dnum);
  		return 1;
  	}
  
  	if ((*part = mtd_part_info(*dev, pnum)) == NULL) {
  		printf("no such partition
  ");
  		*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%08llx@0x%08llx
  ",

  				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, resetting to null
  ");

  			return 1;
  		}
  		return 0;
  	}
  
  	printf("partition %s not found
  ", 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
  ", 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
  ",
  				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, resetting to null
  ");

  		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;

  	char tmp_parts[MTDPARTS_MAXLEN];

  	debug("
  ---parse_mtdparts---
  mtdparts = %s
  
  ", p);

  
  	/* delete all devices and partitions */
  	if (mtd_devices_init() != 0) {
  		printf("could not initialise device list
  ");
  		return err;
  	}
  
  	/* re-read 'mtdparts' variable, mtd_devices_init may be updating env */

  	if (gd->flags & GD_FLG_ENV_READY) {
  		p = getenv("mtdparts");
  	} else {
  		p = tmp_parts;
  		getenv_f("mtdparts", tmp_parts, MTDPARTS_MAXLEN);
  	}

  
  	if (strncmp(p, "mtdparts=", 9) != 0) {
  		printf("mtdparts variable doesn't start with 'mtdparts='
  ");
  		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
  ", 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
  ",
  					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;

  	u64 size;

  	int ret = 1;

  	debug("
  ---parse_mtdids---
  mtdids = %s
  
  ", 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
  ", 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>
  ");
  			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
  ");
  			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
  ",
  					MTD_DEV_TYPE(type), num);
  			break;
  		}
  
  		/* allocate mtdids structure */
  		if (!(id = (struct mtdids *)malloc(sizeof(struct mtdids) + mtd_id_len))) {
  			printf("out of memory
  ");
  			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%16lld bytes\t%s
  ",

  				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];

  	char tmp_parts[MTDPARTS_MAXLEN];

  	debug("
  ---mtdparts_init---
  ");

  	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");

  	/*
  	 * The mtdparts variable tends to be long. If we need to access it
  	 * before the env is relocated, then we need to use our own stack
  	 * buffer.  gd->env_buf will be too small.
  	 */
  	if (gd->flags & GD_FLG_ENV_READY) {
  		parts = getenv("mtdparts");
  	} else {
  		parts = tmp_parts;
  		getenv_f("mtdparts", tmp_parts, MTDPARTS_MAXLEN);
  	}

  	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
  ", last_ids);
  	debug("env_ids   : %s
  ", ids);
  	debug("last_parts: %s
  ", last_parts);
  	debug("env_parts : %s
  
  ", parts);

  	debug("last_partition : %s
  ", last_partition);
  	debug("env_partition  : %s
  ", current_partition);

  
  	/* if mtdids varible is empty try to use defaults */
  	if (!ids) {
  		if (mtdids_default) {

  			debug("mtdids variable not defined, using default
  ");

  			ids = mtdids_default;
  			setenv("mtdids", (char *)ids);
  		} else {
  			printf("mtdids not defined, no default present
  ");
  			return 1;
  		}
  	}
  	if (strlen(ids) > MTDIDS_MAXLEN - 1) {
  		printf("mtdids too long (> %d)
  ", 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'
  ");
  
  	if (parts && (strlen(parts) > MTDPARTS_MAXLEN - 1)) {
  		printf("mtdparts too long (> %d)
  ", 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
  ");
  			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
  ",

  				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
  ", 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...
  ");

  		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("
  --- mtd_part_info: partition number %d for device %s%d (%s)
  ",

  			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)
  ",
  				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
   */

  static 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
  ");
  		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
  ",
  			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
   */

  static 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
  ", 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
  ");
  			return 1;
  		}
  		sprintf(tmpbuf, "%s:%s(%s)%s",
  				id->mtd_id, argv[3], argv[4], argv[5] ? argv[5] : "");

  		debug("add tmpbuf: %s
  ", tmpbuf);

  
  		if ((device_parse(tmpbuf, NULL, &dev) != 0) || (!dev))
  			return 1;

  		debug("+ %s\t%d\t%s
  ", 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
  ", 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, resetting to null
  ");

  			return 1;
  		}
  
  		return 0;
  	}
  
  	/* mtdparts del part-id */
  	if ((argc == 3) && (strcmp(argv[1], "del") == 0)) {

  		debug("del: part-id = %s
  ", 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_RET_USAGE;

  }
  
  /***************************************************/
  U_BOOT_CMD(
  	chpart,	2,	0,	do_chpart,
  	"change active partition",
  	"part-id
  "

  	"    - change active partition (e.g. part-id = nand0,1)"

  );

  #ifdef CONFIG_SYS_LONGHELP
  static char mtdparts_help_text[] =

  	"
  "
  	"    - list partition table
  "
  	"mtdparts delall
  "
  	"    - delete all partitions
  "
  	"mtdparts del part-id
  "
  	"    - delete partition (e.g. part-id = nand0,1)
  "
  	"mtdparts add <mtd-dev> <size>[@<offset>] [<name>] [ro]
  "
  	"    - add partition
  "

  #if defined(CONFIG_CMD_MTDPARTS_SPREAD)
  	"mtdparts add.spread <mtd-dev> <size>[@<offset>] [<name>] [ro]
  "
  	"    - add partition, padding size by skipping bad blocks
  "
  #endif

  	"mtdparts default
  "

  	"    - reset partition table to defaults
  "
  #if defined(CONFIG_CMD_MTDPARTS_SPREAD)
  	"mtdparts spread
  "
  	"    - adjust the sizes of the partitions so they are
  "
  	"      at least as big as the mtdparts variable specifies
  "
  	"      and they each start on a good block
  
  "
  #else
  	"
  "
  #endif /* CONFIG_CMD_MTDPARTS_SPREAD */

  	"-----
  
  "
  	"this command uses three environment variables:
  
  "
  	"'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)";
  #endif
  
  U_BOOT_CMD(
  	mtdparts,	6,	0,	do_mtdparts,
  	"define flash/nand partitions", mtdparts_help_text

  );
  /***************************************************/