common/env_nand.c - uboot/armada - Git at Google

 /*
  * (C) Copyright 2000-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2008
  * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
  *
  * (C) Copyright 2004
  * Jian Zhang, Texas Instruments, jzhang@ti.com.
  *
  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Andreas Heppel <aheppel@sysgo.de>
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License 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
  */

 #include <common.h>
 #include <command.h>
 #include <environment.h>
 #include <linux/stddef.h>
 #include <malloc.h>
 #include <nand.h>
 #include <search.h>
 #include <errno.h>

 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
 #define CMD_SAVEENV
 #elif defined(CONFIG_ENV_OFFSET_REDUND)
 #error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
 #endif

 #if defined(CONFIG_ENV_SIZE_REDUND) &&	\
 	(CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
 #endif

 #ifndef CONFIG_ENV_RANGE
 #define CONFIG_ENV_RANGE	CONFIG_ENV_SIZE
 #endif

 char *env_name_spec = "NAND";

 #if defined(ENV_IS_EMBEDDED)
 env_t *env_ptr = &environment;
 #elif defined(CONFIG_NAND_ENV_DST)
 env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
 #else /* ! ENV_IS_EMBEDDED */
 env_t *env_ptr;
 #endif /* ENV_IS_EMBEDDED */

 DECLARE_GLOBAL_DATA_PTR;

 /*
  * This is called before nand_init() so we can't read NAND to
  * validate env data.
  *
  * Mark it OK for now. env_relocate() in env_common.c will call our
  * relocate function which does the real validation.
  *
  * When using a NAND boot image (like sequoia_nand), the environment
  * can be embedded or attached to the U-Boot image in NAND flash.
  * This way the SPL loads not only the U-Boot image from NAND but
  * also the environment.
  */
 int env_init(void)
 {
 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
 	int crc1_ok = 0, crc2_ok = 0;
 	env_t *tmp_env1;

 #ifdef CONFIG_ENV_OFFSET_REDUND
 	env_t *tmp_env2;

 	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
 	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
 #endif
 	tmp_env1 = env_ptr;
 	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;

 	if (!crc1_ok && !crc2_ok) {
 		gd->env_addr	= 0;
 		gd->env_valid	= 0;

 		return 0;
 	} else if (crc1_ok && !crc2_ok) {
 		gd->env_valid = 1;
 	}
 #ifdef CONFIG_ENV_OFFSET_REDUND
 	else if (!crc1_ok && crc2_ok) {
 		gd->env_valid = 2;
 	} else {
 		/* both ok - check serial */
 		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 			gd->env_valid = 2;
 		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 			gd->env_valid = 1;
 		else if (tmp_env1->flags > tmp_env2->flags)
 			gd->env_valid = 1;
 		else if (tmp_env2->flags > tmp_env1->flags)
 			gd->env_valid = 2;
 		else /* flags are equal - almost impossible */
 			gd->env_valid = 1;
 	}

 	if (gd->env_valid == 2)
 		env_ptr = tmp_env2;
 	else
 #endif
 	if (gd->env_valid == 1)
 		env_ptr = tmp_env1;

 	gd->env_addr = (ulong)env_ptr->data;

 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
 	gd->env_addr	= (ulong)&default_environment[0];
 	gd->env_valid	= 1;
 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */

 	return 0;
 }

 #ifdef CMD_SAVEENV
 /*
  * The legacy NAND code saved the environment in the first NAND device i.e.,
  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
  */
 int writeenv(size_t offset, u_char *buf)
 {
 	uint64_t end = offset + CONFIG_ENV_RANGE;
 	uint64_t amount_saved = 0;
 	uint64_t blocksize, len;

 	u_char *char_ptr;

 	blocksize = nand_info[0].erasesize;
 	len = min(blocksize, CONFIG_ENV_SIZE);

 	offset = CONFIG_ENV_OFFSET;

 	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
 		if (nand_block_isbad(&nand_info[0], offset)) {
 			offset += blocksize;
 		} else {
 			char_ptr = &buf[amount_saved];
 			if (nand_write(&nand_info[0], offset, (size_t *)&len, char_ptr))
 				return 1;

 			offset += blocksize;
 			amount_saved += len;
 		}
 	}
 	if (amount_saved != CONFIG_ENV_SIZE)
 		return 1;

 	return 0;
 }

 #ifdef CONFIG_ENV_OFFSET_REDUND
 static unsigned char env_flags;

 int saveenv(void)
 {
 	env_t	env_new;
 	ssize_t	len;
 	char	*res;
 	int	ret = 0;
 	nand_erase_options_t nand_erase_options;

 	memset(&nand_erase_options, 0, sizeof(nand_erase_options));
 	nand_erase_options.length = CONFIG_ENV_RANGE;
 	nand_erase_options.quiet = 1;


 	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 		return 1;

 	res = (char *)&env_new.data;
 	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
 	if (len < 0) {
 		error("Cannot export environment: errno = %d\n", errno);
 		return 1;
 	}
 	env_new.crc	= crc32(0, env_new.data, ENV_SIZE);
 	env_new.flags	= ++env_flags; /* increase the serial */

 	if (gd->env_valid == 1) {
 		puts("Erasing redundant NAND...\n");
 		nand_erase_options.offset = CONFIG_ENV_OFFSET_REDUND;
 		if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 			return 1;

 		puts("Writing to redundant NAND... ");
 		ret = writeenv(CONFIG_ENV_OFFSET_REDUND, (u_char *)&env_new);
 	} else {
 		puts("Erasing NAND...\n");
 		nand_erase_options.offset = CONFIG_ENV_OFFSET;
 		if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 			return 1;

 		puts("Writing to NAND... ");
 		ret = writeenv(CONFIG_ENV_OFFSET, (u_char *)&env_new);
 	}
 	if (ret) {
 		puts("FAILED!\n");
 		return 1;
 	}

 	puts("done\n");

 	gd->env_valid = gd->env_valid == 2 ? 1 : 2;

 	return ret;
 }
 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 int saveenv(void)
 {
 	int	ret = 0;
 	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
 	ssize_t	len;
 	char	*res;
 	nand_erase_options_t nand_erase_options;

 	memset(&nand_erase_options, 0, sizeof(nand_erase_options));
 	nand_erase_options.length = CONFIG_ENV_RANGE;
 	nand_erase_options.quiet = 1;
 	nand_erase_options.offset = CONFIG_ENV_OFFSET;

 	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 		return 1;

 	res = (char *)&env_new->data;
 	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
 	if (len < 0) {
 		error("Cannot export environment: errno = %d\n", errno);
 		return 1;
 	}
 	env_new->crc = crc32(0, env_new->data, ENV_SIZE);

 	puts("Erasing Nand...\n");
 	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
 		return 1;

 	puts("Writing to Nand... ");
 	if (writeenv(CONFIG_ENV_OFFSET, (u_char *)env_new)) {
 		puts("FAILED!\n");
 		return 1;
 	}

 	puts("done\n");
 	return ret;
 }
 #endif /* CONFIG_ENV_OFFSET_REDUND */
 #endif /* CMD_SAVEENV */

 int readenv(size_t offset, u_char *buf)
 {
 	uint64_t end = offset + CONFIG_ENV_RANGE;
 	uint64_t amount_loaded = 0;
 	uint64_t blocksize, len;

 	u_char *char_ptr;

 	blocksize = nand_info[0].erasesize;
 	if (!blocksize)
 		return 1;

 	len = min(blocksize, CONFIG_ENV_SIZE);

 	offset = CONFIG_ENV_OFFSET;

 	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
 		if (nand_block_isbad(&nand_info[0], offset)) {
 			offset += blocksize;
 		} else {
 			char_ptr = &buf[amount_loaded];
 			if (nand_read_skip_bad(&nand_info[0], offset,
 					       (size_t *)&len, char_ptr))
 				return 1;

 			offset += blocksize;
 			amount_loaded += len;
 		}
 	}

 	if (amount_loaded != CONFIG_ENV_SIZE)
 		return 1;

 	return 0;
 }

 #ifdef CONFIG_ENV_OFFSET_OOB
 int get_nand_env_oob(nand_info_t *nand, unsigned long *result)
 {
 	struct mtd_oob_ops ops;
 	uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
 	int ret;

 	ops.datbuf	= NULL;
 	ops.mode	= MTD_OOB_AUTO;
 	ops.ooboffs	= 0;
 	ops.ooblen	= ENV_OFFSET_SIZE;
 	ops.oobbuf	= (void *)oob_buf;

 	ret = nand->read_oob(nand, ENV_OFFSET_SIZE, &ops);
 	if (ret) {
 		printf("error reading OOB block 0\n");
 		return ret;
 	}

 	if (oob_buf[0] == ENV_OOB_MARKER) {
 		*result = oob_buf[1] * nand->erasesize;
 	} else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
 		*result = oob_buf[1];
 	} else {
 		printf("No dynamic environment marker in OOB block 0\n");
 		return -ENOENT;
 	}

 	return 0;
 }
 #endif

 #ifdef CONFIG_ENV_OFFSET_REDUND
 void env_relocate_spec(void)
 {
 #if !defined(ENV_IS_EMBEDDED)
 	int crc1_ok = 0, crc2_ok = 0;
 	env_t *ep, *tmp_env1, *tmp_env2;

 	tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
 	tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
 	if (tmp_env1 == NULL || tmp_env2 == NULL) {
 		puts("Can't allocate buffers for environment\n");
 		set_default_env("!malloc() failed");
 		goto done;
 	}

 	if (readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1))
 		puts("No Valid Environment Area found\n");

 	if (readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
 		puts("No Valid Redundant Environment Area found\n");

 	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
 	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;

 	if (!crc1_ok && !crc2_ok) {
 		set_default_env("!bad CRC");
 		goto done;
 	} else if (crc1_ok && !crc2_ok) {
 		gd->env_valid = 1;
 	} else if (!crc1_ok && crc2_ok) {
 		gd->env_valid = 2;
 	} else {
 		/* both ok - check serial */
 		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
 			gd->env_valid = 2;
 		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
 			gd->env_valid = 1;
 		else if (tmp_env1->flags > tmp_env2->flags)
 			gd->env_valid = 1;
 		else if (tmp_env2->flags > tmp_env1->flags)
 			gd->env_valid = 2;
 		else /* flags are equal - almost impossible */
 			gd->env_valid = 1;
 	}

 	free(env_ptr);

 	if (gd->env_valid == 1)
 		ep = tmp_env1;
 	else
 		ep = tmp_env2;

 	env_flags = ep->flags;
 	env_import((char *)ep, 0);

 done:
 	free(tmp_env1);
 	free(tmp_env2);

 #endif /* ! ENV_IS_EMBEDDED */
 }
 #else /* ! CONFIG_ENV_OFFSET_REDUND */
 /*
  * The legacy NAND code saved the environment in the first NAND
  * device i.e., nand_dev_desc + 0. This is also the behaviour using
  * the new NAND code.
  */
 void env_relocate_spec(void)
 {
 #if !defined(ENV_IS_EMBEDDED)
 	int ret;
 	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);

 #if defined(CONFIG_ENV_OFFSET_OOB)
 	ret = get_nand_env_oob(&nand_info[0], &nand_env_oob_offset);
 	/*
 	 * If unable to read environment offset from NAND OOB then fall through
 	 * to the normal environment reading code below
 	 */
 	if (!ret) {
 		printf("Found Environment offset in OOB..\n");
 	} else {
 		set_default_env("!no env offset in OOB");
 		return;
 	}
 #endif

 	ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
 	if (ret) {
 		set_default_env("!readenv() failed");
 		return;
 	}

 	env_import(buf, 1);
 #endif /* ! ENV_IS_EMBEDDED */
 }
 #endif /* CONFIG_ENV_OFFSET_REDUND */
	/*
	* (C) Copyright 2000-2010
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2008
	* Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
	*
	* (C) Copyright 2004
	* Jian Zhang, Texas Instruments, jzhang@ti.com.
	*
	* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Andreas Heppel <aheppel@sysgo.de>
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License 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
	*/

	#include <common.h>
	#include <command.h>
	#include <environment.h>
	#include <linux/stddef.h>
	#include <malloc.h>
	#include <nand.h>
	#include <search.h>
	#include <errno.h>

	#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
	#define CMD_SAVEENV
	#elif defined(CONFIG_ENV_OFFSET_REDUND)
	#error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
	#endif

	#if defined(CONFIG_ENV_SIZE_REDUND) && \
	(CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
	#error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
	#endif

	#ifndef CONFIG_ENV_RANGE
	#define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
	#endif

	char *env_name_spec = "NAND";

	#if defined(ENV_IS_EMBEDDED)
	env_t *env_ptr = &environment;
	#elif defined(CONFIG_NAND_ENV_DST)
	env_t env_ptr = (env_t )CONFIG_NAND_ENV_DST;
	#else /* ! ENV_IS_EMBEDDED */
	env_t *env_ptr;
	#endif /* ENV_IS_EMBEDDED */

	DECLARE_GLOBAL_DATA_PTR;

	/*
	* This is called before nand_init() so we can't read NAND to
	* validate env data.
	*
	* Mark it OK for now. env_relocate() in env_common.c will call our
	* relocate function which does the real validation.
	*
	* When using a NAND boot image (like sequoia_nand), the environment
	* can be embedded or attached to the U-Boot image in NAND flash.
	* This way the SPL loads not only the U-Boot image from NAND but
	* also the environment.
	*/
	int env_init(void)
	{
	#if defined(ENV_IS_EMBEDDED) \|\| defined(CONFIG_NAND_ENV_DST)
	int crc1_ok = 0, crc2_ok = 0;
	env_t *tmp_env1;

	#ifdef CONFIG_ENV_OFFSET_REDUND
	env_t *tmp_env2;

	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
	#endif
	tmp_env1 = env_ptr;
	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;

	if (!crc1_ok && !crc2_ok) {
	gd->env_addr = 0;
	gd->env_valid = 0;

	return 0;
	} else if (crc1_ok && !crc2_ok) {
	gd->env_valid = 1;
	}
	#ifdef CONFIG_ENV_OFFSET_REDUND
	else if (!crc1_ok && crc2_ok) {
	gd->env_valid = 2;
	} else {
	/* both ok - check serial */
	if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
	gd->env_valid = 2;
	else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
	gd->env_valid = 1;
	else if (tmp_env1->flags > tmp_env2->flags)
	gd->env_valid = 1;
	else if (tmp_env2->flags > tmp_env1->flags)
	gd->env_valid = 2;
	else /* flags are equal - almost impossible */
	gd->env_valid = 1;
	}

	if (gd->env_valid == 2)
	env_ptr = tmp_env2;
	else
	#endif
	if (gd->env_valid == 1)
	env_ptr = tmp_env1;

	gd->env_addr = (ulong)env_ptr->data;

	#else /* ENV_IS_EMBEDDED \|\| CONFIG_NAND_ENV_DST */
	gd->env_addr = (ulong)&default_environment[0];
	gd->env_valid = 1;
	#endif /* ENV_IS_EMBEDDED \|\| CONFIG_NAND_ENV_DST */

	return 0;
	}

	#ifdef CMD_SAVEENV
	/*
	* The legacy NAND code saved the environment in the first NAND device i.e.,
	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	*/
	int writeenv(size_t offset, u_char *buf)
	{
	uint64_t end = offset + CONFIG_ENV_RANGE;
	uint64_t amount_saved = 0;
	uint64_t blocksize, len;

	u_char *char_ptr;

	blocksize = nand_info[0].erasesize;
	len = min(blocksize, CONFIG_ENV_SIZE);

	offset = CONFIG_ENV_OFFSET;

	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
	if (nand_block_isbad(&nand_info[0], offset)) {
	offset += blocksize;
	} else {
	char_ptr = &buf[amount_saved];
	if (nand_write(&nand_info[0], offset, (size_t *)&len, char_ptr))
	return 1;

	offset += blocksize;
	amount_saved += len;
	}
	}
	if (amount_saved != CONFIG_ENV_SIZE)
	return 1;

	return 0;
	}

	#ifdef CONFIG_ENV_OFFSET_REDUND
	static unsigned char env_flags;

	int saveenv(void)
	{
	env_t env_new;
	ssize_t len;
	char *res;
	int ret = 0;
	nand_erase_options_t nand_erase_options;

	memset(&nand_erase_options, 0, sizeof(nand_erase_options));
	nand_erase_options.length = CONFIG_ENV_RANGE;
	nand_erase_options.quiet = 1;


	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
	return 1;

	res = (char *)&env_new.data;
	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
	if (len < 0) {
	error("Cannot export environment: errno = %d\n", errno);
	return 1;
	}
	env_new.crc = crc32(0, env_new.data, ENV_SIZE);
	env_new.flags = ++env_flags; /* increase the serial */

	if (gd->env_valid == 1) {
	puts("Erasing redundant NAND...\n");
	nand_erase_options.offset = CONFIG_ENV_OFFSET_REDUND;
	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
	return 1;

	puts("Writing to redundant NAND... ");
	ret = writeenv(CONFIG_ENV_OFFSET_REDUND, (u_char *)&env_new);
	} else {
	puts("Erasing NAND...\n");
	nand_erase_options.offset = CONFIG_ENV_OFFSET;
	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
	return 1;

	puts("Writing to NAND... ");
	ret = writeenv(CONFIG_ENV_OFFSET, (u_char *)&env_new);
	}
	if (ret) {
	puts("FAILED!\n");
	return 1;
	}

	puts("done\n");

	gd->env_valid = gd->env_valid == 2 ? 1 : 2;

	return ret;
	}
	#else /* ! CONFIG_ENV_OFFSET_REDUND */
	int saveenv(void)
	{
	int ret = 0;
	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
	ssize_t len;
	char *res;
	nand_erase_options_t nand_erase_options;

	memset(&nand_erase_options, 0, sizeof(nand_erase_options));
	nand_erase_options.length = CONFIG_ENV_RANGE;
	nand_erase_options.quiet = 1;
	nand_erase_options.offset = CONFIG_ENV_OFFSET;

	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
	return 1;

	res = (char *)&env_new->data;
	len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
	if (len < 0) {
	error("Cannot export environment: errno = %d\n", errno);
	return 1;
	}
	env_new->crc = crc32(0, env_new->data, ENV_SIZE);

	puts("Erasing Nand...\n");
	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
	return 1;

	puts("Writing to Nand... ");
	if (writeenv(CONFIG_ENV_OFFSET, (u_char *)env_new)) {
	puts("FAILED!\n");
	return 1;
	}

	puts("done\n");
	return ret;
	}
	#endif /* CONFIG_ENV_OFFSET_REDUND */
	#endif /* CMD_SAVEENV */

	int readenv(size_t offset, u_char *buf)
	{
	uint64_t end = offset + CONFIG_ENV_RANGE;
	uint64_t amount_loaded = 0;
	uint64_t blocksize, len;

	u_char *char_ptr;

	blocksize = nand_info[0].erasesize;
	if (!blocksize)
	return 1;

	len = min(blocksize, CONFIG_ENV_SIZE);

	offset = CONFIG_ENV_OFFSET;

	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
	if (nand_block_isbad(&nand_info[0], offset)) {
	offset += blocksize;
	} else {
	char_ptr = &buf[amount_loaded];
	if (nand_read_skip_bad(&nand_info[0], offset,
	(size_t *)&len, char_ptr))
	return 1;

	offset += blocksize;
	amount_loaded += len;
	}
	}

	if (amount_loaded != CONFIG_ENV_SIZE)
	return 1;

	return 0;
	}

	#ifdef CONFIG_ENV_OFFSET_OOB
	int get_nand_env_oob(nand_info_t nand, unsigned long result)
	{
	struct mtd_oob_ops ops;
	uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
	int ret;

	ops.datbuf = NULL;
	ops.mode = MTD_OOB_AUTO;
	ops.ooboffs = 0;
	ops.ooblen = ENV_OFFSET_SIZE;
	ops.oobbuf = (void *)oob_buf;

	ret = nand->read_oob(nand, ENV_OFFSET_SIZE, &ops);
	if (ret) {
	printf("error reading OOB block 0\n");
	return ret;
	}

	if (oob_buf[0] == ENV_OOB_MARKER) {
	result = oob_buf[1] nand->erasesize;
	} else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
	*result = oob_buf[1];
	} else {
	printf("No dynamic environment marker in OOB block 0\n");
	return -ENOENT;
	}

	return 0;
	}
	#endif

	#ifdef CONFIG_ENV_OFFSET_REDUND
	void env_relocate_spec(void)
	{
	#if !defined(ENV_IS_EMBEDDED)
	int crc1_ok = 0, crc2_ok = 0;
	env_t ep, tmp_env1, *tmp_env2;

	tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
	tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
	if (tmp_env1 == NULL \|\| tmp_env2 == NULL) {
	puts("Can't allocate buffers for environment\n");
	set_default_env("!malloc() failed");
	goto done;
	}

	if (readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1))
	puts("No Valid Environment Area found\n");

	if (readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
	puts("No Valid Redundant Environment Area found\n");

	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;

	if (!crc1_ok && !crc2_ok) {
	set_default_env("!bad CRC");
	goto done;
	} else if (crc1_ok && !crc2_ok) {
	gd->env_valid = 1;
	} else if (!crc1_ok && crc2_ok) {
	gd->env_valid = 2;
	} else {
	/* both ok - check serial */
	if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
	gd->env_valid = 2;
	else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
	gd->env_valid = 1;
	else if (tmp_env1->flags > tmp_env2->flags)
	gd->env_valid = 1;
	else if (tmp_env2->flags > tmp_env1->flags)
	gd->env_valid = 2;
	else /* flags are equal - almost impossible */
	gd->env_valid = 1;
	}

	free(env_ptr);

	if (gd->env_valid == 1)
	ep = tmp_env1;
	else
	ep = tmp_env2;

	env_flags = ep->flags;
	env_import((char *)ep, 0);

	done:
	free(tmp_env1);
	free(tmp_env2);

	#endif /* ! ENV_IS_EMBEDDED */
	}
	#else /* ! CONFIG_ENV_OFFSET_REDUND */
	/*
	* The legacy NAND code saved the environment in the first NAND
	* device i.e., nand_dev_desc + 0. This is also the behaviour using
	* the new NAND code.
	*/
	void env_relocate_spec(void)
	{
	#if !defined(ENV_IS_EMBEDDED)
	int ret;
	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);

	#if defined(CONFIG_ENV_OFFSET_OOB)
	ret = get_nand_env_oob(&nand_info[0], &nand_env_oob_offset);
	/*
	* If unable to read environment offset from NAND OOB then fall through
	* to the normal environment reading code below
	*/
	if (!ret) {
	printf("Found Environment offset in OOB..\n");
	} else {
	set_default_env("!no env offset in OOB");
	return;
	}
	#endif

	ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
	if (ret) {
	set_default_env("!readenv() failed");
	return;
	}

	env_import(buf, 1);
	#endif /* ! ENV_IS_EMBEDDED */
	}
	#endif /* CONFIG_ENV_OFFSET_REDUND */