common/cmd_jffs2.c - u-boot - Git at Google

 /*
  * (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)
  *
  */

 /*
  * JFFS2/CRAMFS support
  */
 #include <common.h>
 #include <command.h>
 #include <malloc.h>
 #include <jffs2/jffs2.h>
 #include <linux/list.h>
 #include <linux/ctype.h>
 #include <cramfs/cramfs_fs.h>

 #if defined(CONFIG_CMD_NAND)
 #include <linux/mtd/nand.h>
 #include <nand.h>
 #endif

 #if defined(CONFIG_CMD_ONENAND)
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/onenand.h>
 #include <onenand_uboot.h>
 #endif

 /* enable/disable debugging messages */
 #define	DEBUG_JFFS
 #undef	DEBUG_JFFS

 #ifdef  DEBUG_JFFS
 # define DEBUGF(fmt, args...)	printf(fmt ,##args)
 #else
 # define DEBUGF(fmt, args...)
 #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

 /* current active device and partition number */
 #ifdef CONFIG_CMD_MTDPARTS
 /* Use the ones declared in cmd_mtdparts.c */
 extern struct mtd_device *current_mtd_dev;
 extern u8 current_mtd_partnum;
 #else
 /* Use local ones */
 struct mtd_device *current_mtd_dev = NULL;
 u8 current_mtd_partnum = 0;
 #endif

 #if defined(CONFIG_CMD_CRAMFS)
 extern int cramfs_check (struct part_info *info);
 extern int cramfs_load (char *loadoffset, struct part_info *info, char *filename);
 extern int cramfs_ls (struct part_info *info, char *filename);
 extern int cramfs_info (struct part_info *info);
 #else
 /* defining empty macros for function names is ugly but avoids ifdef clutter
  * all over the code */
 #define cramfs_check(x)		(0)
 #define cramfs_load(x,y,z)	(-1)
 #define cramfs_ls(x,y)		(0)
 #define cramfs_info(x)		(0)
 #endif

 #ifndef CONFIG_CMD_MTDPARTS
 /**
  * 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
  */
 static int mtd_device_validate(u8 type, u8 num, u32 *size)
 {
 	if (type == MTD_DEV_TYPE_NOR) {
 #if defined(CONFIG_CMD_FLASH)
 		if (num < CONFIG_SYS_MAX_FLASH_BANKS) {
 			extern flash_info_t flash_info[];
 			*size = flash_info[num].size;

 			return 0;
 		}

 		printf("no such FLASH device: %s%d (valid range 0 ... %d\n",
 				MTD_DEV_TYPE(type), num, CONFIG_SYS_MAX_FLASH_BANKS - 1);
 #else
 		printf("support for FLASH devices not present\n");
 #endif
 	} else if (type == MTD_DEV_TYPE_NAND) {
 #if defined(CONFIG_JFFS2_NAND) && defined(CONFIG_CMD_NAND)
 		if (num < CONFIG_SYS_MAX_NAND_DEVICE) {
 			*size = nand_info[num].size;
 			return 0;
 		}

 		printf("no such NAND device: %s%d (valid range 0 ... %d)\n",
 				MTD_DEV_TYPE(type), num, CONFIG_SYS_MAX_NAND_DEVICE - 1);
 #else
 		printf("support for NAND devices not present\n");
 #endif
 	} else if (type == MTD_DEV_TYPE_ONENAND) {
 #if defined(CONFIG_CMD_ONENAND)
 		*size = onenand_mtd.size;
 		return 0;
 #else
 		printf("support for OneNAND devices not present\n");
 #endif
 	} else
 		printf("Unknown defice type %d\n", type);

 	return 1;
 }

 /**
  * 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
  */
 static 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;
 }

 /*
  * 'Static' version of command line mtdparts_init() routine. Single partition on
  * a single device configuration.
  */

 /**
  * Calculate sector size.
  *
  * @return sector size
  */
 static inline u32 get_part_sector_size_nand(struct mtdids *id)
 {
 #if defined(CONFIG_JFFS2_NAND) && defined(CONFIG_CMD_NAND)
 	nand_info_t *nand;

 	nand = &nand_info[id->num];

 	return nand->erasesize;
 #else
 	BUG();
 	return 0;
 #endif
 }

 static inline u32 get_part_sector_size_nor(struct mtdids *id, struct part_info *part)
 {
 #if defined(CONFIG_CMD_FLASH)
 	extern flash_info_t flash_info[];

 	u32 end_phys, start_phys, sector_size = 0, size = 0;
 	int i;
 	flash_info_t *flash;

 	flash = &flash_info[id->num];

 	start_phys = flash->start[0] + part->offset;
 	end_phys = start_phys + part->size;

 	for (i = 0; i < flash->sector_count; i++) {
 		if (flash->start[i] >= end_phys)
 			break;

 		if (flash->start[i] >= start_phys) {
 			if (i == flash->sector_count - 1) {
 				size = flash->start[0] + flash->size - flash->start[i];
 			} else {
 				size = flash->start[i+1] - flash->start[i];
 			}

 			if (sector_size < size)
 				sector_size = size;
 		}
 	}

 	return sector_size;
 #else
 	BUG();
 	return 0;
 #endif
 }

 static inline u32 get_part_sector_size_onenand(void)
 {
 #if defined(CONFIG_CMD_ONENAND)
 	struct mtd_info *mtd;

 	mtd = &onenand_mtd;

 	return mtd->erasesize;
 #else
 	BUG();
 	return 0;
 #endif
 }

 static inline u32 get_part_sector_size(struct mtdids *id, struct part_info *part)
 {
 	if (id->type == MTD_DEV_TYPE_NAND)
 		return get_part_sector_size_nand(id);
 	else if (id->type == MTD_DEV_TYPE_NOR)
 		return get_part_sector_size_nor(id, part);
 	else if (id->type == MTD_DEV_TYPE_ONENAND)
 		return get_part_sector_size_onenand();
 	else
 		DEBUGF("Error: Unknown device type.\n");

 	return 0;
 }

 /**
  * Parse and initialize global mtdids mapping and create global
  * device/partition list.
  *
  * 'Static' version of command line mtdparts_init() routine. Single partition on
  * a single device configuration.
  *
  * @return 0 on success, 1 otherwise
  */
 int mtdparts_init(void)
 {
 	static int initialized = 0;
 	u32 size;
 	char *dev_name;

 	DEBUGF("\n---mtdparts_init---\n");
 	if (!initialized) {
 		struct mtdids *id;
 		struct part_info *part;

 		initialized = 1;
 		current_mtd_dev = (struct mtd_device *)
 			malloc(sizeof(struct mtd_device) +
 					sizeof(struct part_info) +
 					sizeof(struct mtdids));
 		if (!current_mtd_dev) {
 			printf("out of memory\n");
 			return 1;
 		}
 		memset(current_mtd_dev, 0, sizeof(struct mtd_device) +
 		       sizeof(struct part_info) + sizeof(struct mtdids));

 		id = (struct mtdids *)(current_mtd_dev + 1);
 		part = (struct part_info *)(id + 1);

 		/* id */
 		id->mtd_id = "single part";

 #if defined(CONFIG_JFFS2_DEV)
 		dev_name = CONFIG_JFFS2_DEV;
 #else
 		dev_name = "nor0";
 #endif

 		if ((mtd_id_parse(dev_name, NULL, &id->type, &id->num) != 0) ||
 				(mtd_device_validate(id->type, id->num, &size) != 0)) {
 			printf("incorrect device: %s%d\n", MTD_DEV_TYPE(id->type), id->num);
 			free(current_mtd_dev);
 			return 1;
 		}
 		id->size = size;
 		INIT_LIST_HEAD(&id->link);

 		DEBUGF("dev id: type = %d, num = %d, size = 0x%08lx, mtd_id = %s\n",
 				id->type, id->num, id->size, id->mtd_id);

 		/* partition */
 		part->name = "static";
 		part->auto_name = 0;

 #if defined(CONFIG_JFFS2_PART_SIZE)
 		part->size = CONFIG_JFFS2_PART_SIZE;
 #else
 		part->size = SIZE_REMAINING;
 #endif

 #if defined(CONFIG_JFFS2_PART_OFFSET)
 		part->offset = CONFIG_JFFS2_PART_OFFSET;
 #else
 		part->offset = 0x00000000;
 #endif

 		part->sector_size = get_part_sector_size(id, part);

 		part->dev = current_mtd_dev;
 		INIT_LIST_HEAD(&part->link);

 		/* recalculate size if needed */
 		if (part->size == SIZE_REMAINING)
 			part->size = id->size - part->offset;

 		DEBUGF("part  : name = %s, size = 0x%08lx, offset = 0x%08lx\n",
 				part->name, part->size, part->offset);

 		/* device */
 		current_mtd_dev->id = id;
 		INIT_LIST_HEAD(&current_mtd_dev->link);
 		current_mtd_dev->num_parts = 1;
 		INIT_LIST_HEAD(&current_mtd_dev->parts);
 		list_add(&part->link, &current_mtd_dev->parts);
 	}

 	return 0;
 }
 #endif /* #ifndef CONFIG_CMD_MTDPARTS */

 /**
  * 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* jffs2_part_info(struct mtd_device *dev, unsigned int part_num)
 {
 	struct list_head *entry;
 	struct part_info *part;
 	int num;

 	if (!dev)
 		return NULL;

 	DEBUGF("\n--- jffs2_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				   */
 /***************************************************/

 /**
  * Routine implementing fsload u-boot command. This routine tries to load
  * a requested file from jffs2/cramfs filesystem on a current partition.
  *
  * @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_jffs2_fsload(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
 	char *fsname;
 	char *filename;
 	int size;
 	struct part_info *part;
 	ulong offset = load_addr;

 	/* pre-set Boot file name */
 	if ((filename = getenv("bootfile")) == NULL) {
 		filename = "uImage";
 	}

 	if (argc == 2) {
 		filename = argv[1];
 	}
 	if (argc == 3) {
 		offset = simple_strtoul(argv[1], NULL, 16);
 		load_addr = offset;
 		filename = argv[2];
 	}

 	/* make sure we are in sync with env variables */
 	if (mtdparts_init() !=0)
 		return 1;

 	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){

 		/* check partition type for cramfs */
 		fsname = (cramfs_check(part) ? "CRAMFS" : "JFFS2");
 		printf("### %s loading '%s' to 0x%lx\n", fsname, filename, offset);

 		if (cramfs_check(part)) {
 			size = cramfs_load ((char *) offset, part, filename);
 		} else {
 			/* if this is not cramfs assume jffs2 */
 			size = jffs2_1pass_load((char *)offset, part, filename);
 		}

 		if (size > 0) {
 			char buf[10];
 			printf("### %s load complete: %d bytes loaded to 0x%lx\n",
 				fsname, size, offset);
 			sprintf(buf, "%x", size);
 			setenv("filesize", buf);
 		} else {
 			printf("### %s LOAD ERROR<%x> for %s!\n", fsname, size, filename);
 		}

 		return !(size > 0);
 	}
 	return 1;
 }

 /**
  * Routine implementing u-boot ls command which lists content of a given
  * directory on a current partition.
  *
  * @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_jffs2_ls(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
 	char *filename = "/";
 	int ret;
 	struct part_info *part;

 	if (argc == 2)
 		filename = argv[1];

 	/* make sure we are in sync with env variables */
 	if (mtdparts_init() !=0)
 		return 1;

 	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){

 		/* check partition type for cramfs */
 		if (cramfs_check(part)) {
 			ret = cramfs_ls (part, filename);
 		} else {
 			/* if this is not cramfs assume jffs2 */
 			ret = jffs2_1pass_ls(part, filename);
 		}

 		return ret ? 0 : 1;
 	}
 	return 1;
 }

 /**
  * Routine implementing u-boot fsinfo command. This routine prints out
  * miscellaneous filesystem informations/statistics.
  *
  * @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_jffs2_fsinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
 	struct part_info *part;
 	char *fsname;
 	int ret;

 	/* make sure we are in sync with env variables */
 	if (mtdparts_init() !=0)
 		return 1;

 	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){

 		/* check partition type for cramfs */
 		fsname = (cramfs_check(part) ? "CRAMFS" : "JFFS2");
 		printf("### filesystem type is %s\n", fsname);

 		if (cramfs_check(part)) {
 			ret = cramfs_info (part);
 		} else {
 			/* if this is not cramfs assume jffs2 */
 			ret = jffs2_1pass_info(part);
 		}

 		return ret ? 0 : 1;
 	}
 	return 1;
 }

 /***************************************************/
 U_BOOT_CMD(
 	fsload,	3,	0,	do_jffs2_fsload,
 	"load binary file from a filesystem image",
 	"[ off ] [ filename ]\n"
 	"    - load binary file from flash bank\n"
 	"      with offset 'off'"
 );
 U_BOOT_CMD(
 	ls,	2,	1,	do_jffs2_ls,
 	"list files in a directory (default /)",
 	"[ directory ]"
 );

 U_BOOT_CMD(
 	fsinfo,	1,	1,	do_jffs2_fsinfo,
 	"print information about filesystems",
 	""
 );
 /***************************************************/
	/*
	* (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)
	*
	*/

	/*
	* JFFS2/CRAMFS support
	*/
	#include <common.h>
	#include <command.h>
	#include <malloc.h>
	#include <jffs2/jffs2.h>
	#include <linux/list.h>
	#include <linux/ctype.h>
	#include <cramfs/cramfs_fs.h>

	#if defined(CONFIG_CMD_NAND)
	#include <linux/mtd/nand.h>
	#include <nand.h>
	#endif

	#if defined(CONFIG_CMD_ONENAND)
	#include <linux/mtd/mtd.h>
	#include <linux/mtd/onenand.h>
	#include <onenand_uboot.h>
	#endif

	/* enable/disable debugging messages */
	#define DEBUG_JFFS
	#undef DEBUG_JFFS

	#ifdef DEBUG_JFFS
	# define DEBUGF(fmt, args...) printf(fmt ,##args)
	#else
	# define DEBUGF(fmt, args...)
	#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

	/* current active device and partition number */
	#ifdef CONFIG_CMD_MTDPARTS
	/* Use the ones declared in cmd_mtdparts.c */
	extern struct mtd_device *current_mtd_dev;
	extern u8 current_mtd_partnum;
	#else
	/* Use local ones */
	struct mtd_device *current_mtd_dev = NULL;
	u8 current_mtd_partnum = 0;
	#endif

	#if defined(CONFIG_CMD_CRAMFS)
	extern int cramfs_check (struct part_info *info);
	extern int cramfs_load (char loadoffset, struct part_info info, char *filename);
	extern int cramfs_ls (struct part_info info, char filename);
	extern int cramfs_info (struct part_info *info);
	#else
	/* defining empty macros for function names is ugly but avoids ifdef clutter
	* all over the code */
	#define cramfs_check(x) (0)
	#define cramfs_load(x,y,z) (-1)
	#define cramfs_ls(x,y) (0)
	#define cramfs_info(x) (0)
	#endif

	#ifndef CONFIG_CMD_MTDPARTS
	/**
	* 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
	*/
	static int mtd_device_validate(u8 type, u8 num, u32 *size)
	{
	if (type == MTD_DEV_TYPE_NOR) {
	#if defined(CONFIG_CMD_FLASH)
	if (num < CONFIG_SYS_MAX_FLASH_BANKS) {
	extern flash_info_t flash_info[];
	*size = flash_info[num].size;

	return 0;
	}

	printf("no such FLASH device: %s%d (valid range 0 ... %d\n",
	MTD_DEV_TYPE(type), num, CONFIG_SYS_MAX_FLASH_BANKS - 1);
	#else
	printf("support for FLASH devices not present\n");
	#endif
	} else if (type == MTD_DEV_TYPE_NAND) {
	#if defined(CONFIG_JFFS2_NAND) && defined(CONFIG_CMD_NAND)
	if (num < CONFIG_SYS_MAX_NAND_DEVICE) {
	*size = nand_info[num].size;
	return 0;
	}

	printf("no such NAND device: %s%d (valid range 0 ... %d)\n",
	MTD_DEV_TYPE(type), num, CONFIG_SYS_MAX_NAND_DEVICE - 1);
	#else
	printf("support for NAND devices not present\n");
	#endif
	} else if (type == MTD_DEV_TYPE_ONENAND) {
	#if defined(CONFIG_CMD_ONENAND)
	*size = onenand_mtd.size;
	return 0;
	#else
	printf("support for OneNAND devices not present\n");
	#endif
	} else
	printf("Unknown defice type %d\n", type);

	return 1;
	}

	/**
	* 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
	*/
	static 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;
	}

	/*
	* 'Static' version of command line mtdparts_init() routine. Single partition on
	* a single device configuration.
	*/

	/**
	* Calculate sector size.
	*
	* @return sector size
	*/
	static inline u32 get_part_sector_size_nand(struct mtdids *id)
	{
	#if defined(CONFIG_JFFS2_NAND) && defined(CONFIG_CMD_NAND)
	nand_info_t *nand;

	nand = &nand_info[id->num];

	return nand->erasesize;
	#else
	BUG();
	return 0;
	#endif
	}

	static inline u32 get_part_sector_size_nor(struct mtdids id, struct part_info part)
	{
	#if defined(CONFIG_CMD_FLASH)
	extern flash_info_t flash_info[];

	u32 end_phys, start_phys, sector_size = 0, size = 0;
	int i;
	flash_info_t *flash;

	flash = &flash_info[id->num];

	start_phys = flash->start[0] + part->offset;
	end_phys = start_phys + part->size;

	for (i = 0; i < flash->sector_count; i++) {
	if (flash->start[i] >= end_phys)
	break;

	if (flash->start[i] >= start_phys) {
	if (i == flash->sector_count - 1) {
	size = flash->start[0] + flash->size - flash->start[i];
	} else {
	size = flash->start[i+1] - flash->start[i];
	}

	if (sector_size < size)
	sector_size = size;
	}
	}

	return sector_size;
	#else
	BUG();
	return 0;
	#endif
	}

	static inline u32 get_part_sector_size_onenand(void)
	{
	#if defined(CONFIG_CMD_ONENAND)
	struct mtd_info *mtd;

	mtd = &onenand_mtd;

	return mtd->erasesize;
	#else
	BUG();
	return 0;
	#endif
	}

	static inline u32 get_part_sector_size(struct mtdids id, struct part_info part)
	{
	if (id->type == MTD_DEV_TYPE_NAND)
	return get_part_sector_size_nand(id);
	else if (id->type == MTD_DEV_TYPE_NOR)
	return get_part_sector_size_nor(id, part);
	else if (id->type == MTD_DEV_TYPE_ONENAND)
	return get_part_sector_size_onenand();
	else
	DEBUGF("Error: Unknown device type.\n");

	return 0;
	}

	/**
	* Parse and initialize global mtdids mapping and create global
	* device/partition list.
	*
	* 'Static' version of command line mtdparts_init() routine. Single partition on
	* a single device configuration.
	*
	* @return 0 on success, 1 otherwise
	*/
	int mtdparts_init(void)
	{
	static int initialized = 0;
	u32 size;
	char *dev_name;

	DEBUGF("\n---mtdparts_init---\n");
	if (!initialized) {
	struct mtdids *id;
	struct part_info *part;

	initialized = 1;
	current_mtd_dev = (struct mtd_device *)
	malloc(sizeof(struct mtd_device) +
	sizeof(struct part_info) +
	sizeof(struct mtdids));
	if (!current_mtd_dev) {
	printf("out of memory\n");
	return 1;
	}
	memset(current_mtd_dev, 0, sizeof(struct mtd_device) +
	sizeof(struct part_info) + sizeof(struct mtdids));

	id = (struct mtdids *)(current_mtd_dev + 1);
	part = (struct part_info *)(id + 1);

	/* id */
	id->mtd_id = "single part";

	#if defined(CONFIG_JFFS2_DEV)
	dev_name = CONFIG_JFFS2_DEV;
	#else
	dev_name = "nor0";
	#endif

	if ((mtd_id_parse(dev_name, NULL, &id->type, &id->num) != 0) \|\|
	(mtd_device_validate(id->type, id->num, &size) != 0)) {
	printf("incorrect device: %s%d\n", MTD_DEV_TYPE(id->type), id->num);
	free(current_mtd_dev);
	return 1;
	}
	id->size = size;
	INIT_LIST_HEAD(&id->link);

	DEBUGF("dev id: type = %d, num = %d, size = 0x%08lx, mtd_id = %s\n",
	id->type, id->num, id->size, id->mtd_id);

	/* partition */
	part->name = "static";
	part->auto_name = 0;

	#if defined(CONFIG_JFFS2_PART_SIZE)
	part->size = CONFIG_JFFS2_PART_SIZE;
	#else
	part->size = SIZE_REMAINING;
	#endif

	#if defined(CONFIG_JFFS2_PART_OFFSET)
	part->offset = CONFIG_JFFS2_PART_OFFSET;
	#else
	part->offset = 0x00000000;
	#endif

	part->sector_size = get_part_sector_size(id, part);

	part->dev = current_mtd_dev;
	INIT_LIST_HEAD(&part->link);

	/* recalculate size if needed */
	if (part->size == SIZE_REMAINING)
	part->size = id->size - part->offset;

	DEBUGF("part : name = %s, size = 0x%08lx, offset = 0x%08lx\n",
	part->name, part->size, part->offset);

	/* device */
	current_mtd_dev->id = id;
	INIT_LIST_HEAD(&current_mtd_dev->link);
	current_mtd_dev->num_parts = 1;
	INIT_LIST_HEAD(&current_mtd_dev->parts);
	list_add(&part->link, &current_mtd_dev->parts);
	}

	return 0;
	}
	#endif /* #ifndef CONFIG_CMD_MTDPARTS */

	/**
	* 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* jffs2_part_info(struct mtd_device *dev, unsigned int part_num)
	{
	struct list_head *entry;
	struct part_info *part;
	int num;

	if (!dev)
	return NULL;

	DEBUGF("\n--- jffs2_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 */
	/***************************************************/

	/**
	* Routine implementing fsload u-boot command. This routine tries to load
	* a requested file from jffs2/cramfs filesystem on a current partition.
	*
	* @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_jffs2_fsload(cmd_tbl_t cmdtp, int flag, int argc, char argv[])
	{
	char *fsname;
	char *filename;
	int size;
	struct part_info *part;
	ulong offset = load_addr;

	/* pre-set Boot file name */
	if ((filename = getenv("bootfile")) == NULL) {
	filename = "uImage";
	}

	if (argc == 2) {
	filename = argv[1];
	}
	if (argc == 3) {
	offset = simple_strtoul(argv[1], NULL, 16);
	load_addr = offset;
	filename = argv[2];
	}

	/* make sure we are in sync with env variables */
	if (mtdparts_init() !=0)
	return 1;

	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){

	/* check partition type for cramfs */
	fsname = (cramfs_check(part) ? "CRAMFS" : "JFFS2");
	printf("### %s loading '%s' to 0x%lx\n", fsname, filename, offset);

	if (cramfs_check(part)) {
	size = cramfs_load ((char *) offset, part, filename);
	} else {
	/* if this is not cramfs assume jffs2 */
	size = jffs2_1pass_load((char *)offset, part, filename);
	}

	if (size > 0) {
	char buf[10];
	printf("### %s load complete: %d bytes loaded to 0x%lx\n",
	fsname, size, offset);
	sprintf(buf, "%x", size);
	setenv("filesize", buf);
	} else {
	printf("### %s LOAD ERROR<%x> for %s!\n", fsname, size, filename);
	}

	return !(size > 0);
	}
	return 1;
	}

	/**
	* Routine implementing u-boot ls command which lists content of a given
	* directory on a current partition.
	*
	* @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_jffs2_ls(cmd_tbl_t cmdtp, int flag, int argc, char argv[])
	{
	char *filename = "/";
	int ret;
	struct part_info *part;

	if (argc == 2)
	filename = argv[1];

	/* make sure we are in sync with env variables */
	if (mtdparts_init() !=0)
	return 1;

	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){

	/* check partition type for cramfs */
	if (cramfs_check(part)) {
	ret = cramfs_ls (part, filename);
	} else {
	/* if this is not cramfs assume jffs2 */
	ret = jffs2_1pass_ls(part, filename);
	}

	return ret ? 0 : 1;
	}
	return 1;
	}

	/**
	* Routine implementing u-boot fsinfo command. This routine prints out
	* miscellaneous filesystem informations/statistics.
	*
	* @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_jffs2_fsinfo(cmd_tbl_t cmdtp, int flag, int argc, char argv[])
	{
	struct part_info *part;
	char *fsname;
	int ret;

	/* make sure we are in sync with env variables */
	if (mtdparts_init() !=0)
	return 1;

	if ((part = jffs2_part_info(current_mtd_dev, current_mtd_partnum))){

	/* check partition type for cramfs */
	fsname = (cramfs_check(part) ? "CRAMFS" : "JFFS2");
	printf("### filesystem type is %s\n", fsname);

	if (cramfs_check(part)) {
	ret = cramfs_info (part);
	} else {
	/* if this is not cramfs assume jffs2 */
	ret = jffs2_1pass_info(part);
	}

	return ret ? 0 : 1;
	}
	return 1;
	}

	/***************************************************/
	U_BOOT_CMD(
	fsload, 3, 0, do_jffs2_fsload,
	"load binary file from a filesystem image",
	"[ off ] [ filename ]\n"
	" - load binary file from flash bank\n"
	" with offset 'off'"
	);
	U_BOOT_CMD(
	ls, 2, 1, do_jffs2_ls,
	"list files in a directory (default /)",
	"[ directory ]"
	);

	U_BOOT_CMD(
	fsinfo, 1, 1, do_jffs2_fsinfo,
	"print information about filesystems",
	""
	);
	/***************************************************/