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

 /*
  * (C) Copyright 2008
  * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
  *
  * (C) Copyright 2004
  * Jian Zhang, Texas Instruments, jzhang@ti.com.

  * (C) Copyright 2000-2006
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (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
  */

 /* #define DEBUG */

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

 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
 #define CMD_SAVEENV
 #elif defined(CONFIG_ENV_OFFSET_REDUND)
 #error Cannot use CONFIG_ENV_OFFSET_REDUND without 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

 #ifdef CONFIG_INFERNO
 #error CONFIG_INFERNO not supported yet
 #endif

 #ifndef CONFIG_ENV_RANGE
 #define CONFIG_ENV_RANGE	CONFIG_ENV_SIZE
 #endif

 /* references to names in env_common.c */
 extern uchar default_environment[];

 char * env_name_spec = "NAND";


 #if defined(ENV_IS_EMBEDDED)
 extern uchar environment[];
 env_t *env_ptr = (env_t *)(&environment[0]);
 #elif defined(CONFIG_NAND_ENV_DST)
 env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
 #else /* ! ENV_IS_EMBEDDED */
 env_t *env_ptr = 0;
 #endif /* ENV_IS_EMBEDDED */


 /* local functions */
 #if !defined(ENV_IS_EMBEDDED)
 static void use_default(void);
 #endif

 DECLARE_GLOBAL_DATA_PTR;

 uchar env_get_char_spec (int index)
 {
 	return ( *((uchar *)(gd->env_addr + index)) );
 }


 /* 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);

 #if defined(CONFIG_SKIP_BAD_BLOCK)
 	uint64_t offset_from_start = 0;
 	int i = 0;
 	while(i * blocksize < nand_info[0].size) {
 		if (!nand_block_isbad(&nand_info[0], offset_from_start))
 			offset_from_start += blocksize;
 		if (offset_from_start >= CONFIG_ENV_OFFSET)
 			break;
 		i++;
 	}
 	if (offset < offset_from_start)
 		offset = offset_from_start;
 #endif

 	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, &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
 int saveenv(void)
 {
 	int ret = 0;
 	nand_erase_options_t nand_erase_options;

 	env_ptr->flags++;

 	nand_erase_options.length = CONFIG_ENV_RANGE;
 	nand_erase_options.quiet = 1;
 	nand_erase_options.jffs2 = 0;
 	nand_erase_options.scrub = 0;

 	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 		return 1;
 	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_ptr);
 	} 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_ptr);
 	}
 	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;
 	nand_erase_options_t nand_erase_options;

 	nand_erase_options.length = CONFIG_ENV_RANGE;
 	nand_erase_options.quiet = 1;
 	nand_erase_options.jffs2 = 0;
 	nand_erase_options.scrub = 0;
 	nand_erase_options.offset = CONFIG_ENV_OFFSET;

 	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
 		return 1;
 	printf("Erasing 0x%x - 0x%x:",CONFIG_ENV_OFFSET, CONFIG_ENV_OFFSET + CONFIG_ENV_RANGE);
 	if (nand_erase_opts(&nand_info[0], &nand_erase_options)) {
 		printf("\t\t[Failed]\n");
 		return 1;
 	}
 	printf("\t\t[Done]\n");
 	puts ("Writing to Nand:");
 	if (writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr)) {
 		printf("\t\t[Failed]\n");
 		return 1;
 	}

 	printf("\t\t[Done]\n");
 	return ret;
 }
 #endif /* CONFIG_ENV_OFFSET_REDUND */
 #endif /* CMD_SAVEENV */
 #if defined(CONFIG_MARVELL)
 uint nandEnvBase;
 #endif
 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;
 	len = min(blocksize, CONFIG_ENV_SIZE);

 #if defined(CONFIG_SKIP_BAD_BLOCK)
 	uint64_t offset_from_start = 0;
 	int i = 0;
 	while(i * blocksize < nand_info[0].size) {
 		if (!nand_block_isbad(&nand_info[0], offset_from_start))
 			offset_from_start += blocksize;
 		if (offset_from_start >= CONFIG_ENV_OFFSET)
 			break;
 		i++;
 	}
 	if (offset < offset_from_start)
 		offset = offset_from_start;
 #endif

 	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 defined(CONFIG_MARVELL)
 			nandEnvBase = offset;
 #endif
 			if (nand_read(&nand_info[0], offset, &len, char_ptr))
 				return 1;
 			offset += blocksize;
 			amount_loaded += len;
 		}
 	}
 	if (amount_loaded != CONFIG_ENV_SIZE)
 		return 1;

 	return 0;
 }

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

 	tmp_env1 = (env_t *) malloc(CONFIG_ENV_SIZE);
 	tmp_env2 = (env_t *) malloc(CONFIG_ENV_SIZE);

 	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 Reundant 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) {
 		free(tmp_env1);
 		free(tmp_env2);
 		return use_default();
 	} 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) {
 		env_ptr = tmp_env1;
 		free(tmp_env2);
 	} else {
 		env_ptr = tmp_env2;
 		free(tmp_env1);
 	}

 #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;

 	ret = readenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
 	if (ret)
 		return use_default();

 	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
 		return use_default();
 #endif /* ! ENV_IS_EMBEDDED */
 }
 #endif /* CONFIG_ENV_OFFSET_REDUND */

 #if !defined(ENV_IS_EMBEDDED)
 static void use_default()
 {
 	puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
 	set_default_env();
 }
 #endif
	/*
	* (C) Copyright 2008
	* Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
	*
	* (C) Copyright 2004
	* Jian Zhang, Texas Instruments, jzhang@ti.com.

	* (C) Copyright 2000-2006
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (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
	*/

	/* #define DEBUG */

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

	#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
	#define CMD_SAVEENV
	#elif defined(CONFIG_ENV_OFFSET_REDUND)
	#error Cannot use CONFIG_ENV_OFFSET_REDUND without 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

	#ifdef CONFIG_INFERNO
	#error CONFIG_INFERNO not supported yet
	#endif

	#ifndef CONFIG_ENV_RANGE
	#define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
	#endif

	/* references to names in env_common.c */
	extern uchar default_environment[];

	char * env_name_spec = "NAND";


	#if defined(ENV_IS_EMBEDDED)
	extern uchar environment[];
	env_t env_ptr = (env_t )(&environment[0]);
	#elif defined(CONFIG_NAND_ENV_DST)
	env_t env_ptr = (env_t )CONFIG_NAND_ENV_DST;
	#else /* ! ENV_IS_EMBEDDED */
	env_t *env_ptr = 0;
	#endif /* ENV_IS_EMBEDDED */


	/* local functions */
	#if !defined(ENV_IS_EMBEDDED)
	static void use_default(void);
	#endif

	DECLARE_GLOBAL_DATA_PTR;

	uchar env_get_char_spec (int index)
	{
	return ( ((uchar )(gd->env_addr + index)) );
	}


	/* 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);

	#if defined(CONFIG_SKIP_BAD_BLOCK)
	uint64_t offset_from_start = 0;
	int i = 0;
	while(i * blocksize < nand_info[0].size) {
	if (!nand_block_isbad(&nand_info[0], offset_from_start))
	offset_from_start += blocksize;
	if (offset_from_start >= CONFIG_ENV_OFFSET)
	break;
	i++;
	}
	if (offset < offset_from_start)
	offset = offset_from_start;
	#endif

	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, &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
	int saveenv(void)
	{
	int ret = 0;
	nand_erase_options_t nand_erase_options;

	env_ptr->flags++;

	nand_erase_options.length = CONFIG_ENV_RANGE;
	nand_erase_options.quiet = 1;
	nand_erase_options.jffs2 = 0;
	nand_erase_options.scrub = 0;

	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
	return 1;
	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_ptr);
	} 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_ptr);
	}
	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;
	nand_erase_options_t nand_erase_options;

	nand_erase_options.length = CONFIG_ENV_RANGE;
	nand_erase_options.quiet = 1;
	nand_erase_options.jffs2 = 0;
	nand_erase_options.scrub = 0;
	nand_erase_options.offset = CONFIG_ENV_OFFSET;

	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
	return 1;
	printf("Erasing 0x%x - 0x%x:",CONFIG_ENV_OFFSET, CONFIG_ENV_OFFSET + CONFIG_ENV_RANGE);
	if (nand_erase_opts(&nand_info[0], &nand_erase_options)) {
	printf("\t\t[Failed]\n");
	return 1;
	}
	printf("\t\t[Done]\n");
	puts ("Writing to Nand:");
	if (writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr)) {
	printf("\t\t[Failed]\n");
	return 1;
	}

	printf("\t\t[Done]\n");
	return ret;
	}
	#endif /* CONFIG_ENV_OFFSET_REDUND */
	#endif /* CMD_SAVEENV */
	#if defined(CONFIG_MARVELL)
	uint nandEnvBase;
	#endif
	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;
	len = min(blocksize, CONFIG_ENV_SIZE);

	#if defined(CONFIG_SKIP_BAD_BLOCK)
	uint64_t offset_from_start = 0;
	int i = 0;
	while(i * blocksize < nand_info[0].size) {
	if (!nand_block_isbad(&nand_info[0], offset_from_start))
	offset_from_start += blocksize;
	if (offset_from_start >= CONFIG_ENV_OFFSET)
	break;
	i++;
	}
	if (offset < offset_from_start)
	offset = offset_from_start;
	#endif

	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 defined(CONFIG_MARVELL)
	nandEnvBase = offset;
	#endif
	if (nand_read(&nand_info[0], offset, &len, char_ptr))
	return 1;
	offset += blocksize;
	amount_loaded += len;
	}
	}
	if (amount_loaded != CONFIG_ENV_SIZE)
	return 1;

	return 0;
	}

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

	tmp_env1 = (env_t *) malloc(CONFIG_ENV_SIZE);
	tmp_env2 = (env_t *) malloc(CONFIG_ENV_SIZE);

	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 Reundant 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) {
	free(tmp_env1);
	free(tmp_env2);
	return use_default();
	} 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) {
	env_ptr = tmp_env1;
	free(tmp_env2);
	} else {
	env_ptr = tmp_env2;
	free(tmp_env1);
	}

	#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;

	ret = readenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
	if (ret)
	return use_default();

	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
	return use_default();
	#endif /* ! ENV_IS_EMBEDDED */
	}
	#endif /* CONFIG_ENV_OFFSET_REDUND */

	#if !defined(ENV_IS_EMBEDDED)
	static void use_default()
	{
	puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
	set_default_env();
	}
	#endif