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cmd_mtdparts.c

/*
 * (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.
 *
 *   $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();
}

/**
 * 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;
      char mtd_dev[16];
      int i, j;
      ulong start;

      sprintf(mtd_dev, "%s%d", MTD_DEV_TYPE(id->type), id->num);
      mtd = get_mtd_device_nm(mtd_dev);
      if (IS_ERR(mtd)) {
            printf("Partition %s not found on device %s!\n", part->name, mtd_dev);
            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 dev device to validate
 * @return 0 if device is valid, 1 otherwise
 */
int mtd_device_validate(u8 type, u8 num, u32 *size)
{
      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;
      }

      *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;
}

/**
 * Format and print out a partition list for each device from global device
 * list.
 */
static void list_partitions(void)
{
      struct list_head *dentry, *pentry;
      struct part_info *part;
      struct mtd_device *dev;
      int part_num;

      debug("\n---list_partitions---\n");
      list_for_each(dentry, &devices) {
            dev = list_entry(dentry, struct mtd_device, link);
            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 partitions for given device */
            part_num = 0;
            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);

                  part_num++;
            }
      }
      if (list_empty(&devices))
            printf("no partitions defined\n");

      /* 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;
}

/**
 * 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)) && (strcmp(argv[1], "add") == 0)) {
#define PART_ADD_DESC_MAXLEN 64
            char tmpbuf[PART_ADD_DESC_MAXLEN];
            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);

            if ((dev_tmp = device_find(dev->id->type, dev->id->num)) == NULL) {
                  device_add(dev);
            } else {
                  /* merge new partition with existing ones*/
                  p = list_entry(dev->parts.next, struct part_info, link);
                  if (part_add(dev_tmp, p) != 0) {
                        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]);
      }

      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"
      "mtdparts default\n"
      "    - reset partition table to defaults\n\n"
      "-----\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)"
);
/***************************************************/

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