[people/ms/u-boot.git] / common / env_nand.c

/*
 * (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_ENV) && defined(CONFIG_CMD_NAND)
#define CMD_SAVEENV
#elif defined(CFG_ENV_OFFSET_REDUND)
#error Cannot use CFG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_NAND
#endif

#if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
#error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
#endif

#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif

#ifndef CFG_ENV_RANGE
#define CFG_ENV_RANGE	CFG_ENV_SIZE
#endif

int nand_legacy_rw (struct nand_chip* nand, int cmd,
	    size_t start, size_t len,
	    size_t * retlen, u_char * buf);

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

char * env_name_spec = "NAND";


#ifdef ENV_IS_EMBEDDED
extern uchar environment[];
env_t *env_ptr = (env_t *)(&environment[0]);
#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)
	size_t total;
	int crc1_ok = 0, crc2_ok = 0;
	env_t *tmp_env1, *tmp_env2;

	total = CFG_ENV_SIZE;

	tmp_env1 = env_ptr;
	tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);

	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)
		gd->env_valid = 0;
	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;
	}

	if (gd->env_valid == 1)
		env_ptr = tmp_env1;
	else if (gd->env_valid == 2)
		env_ptr = tmp_env2;
#else /* ENV_IS_EMBEDDED */
	gd->env_addr  = (ulong)&default_environment[0];
	gd->env_valid = 1;
#endif /* ENV_IS_EMBEDDED */

	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)
{
	size_t end = offset + CFG_ENV_RANGE;
	size_t amount_saved = 0;
	size_t blocksize, len;

	u_char *char_ptr;

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

	while (amount_saved < CFG_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 != CFG_ENV_SIZE)
		return 1;

	return 0;
}
#ifdef CFG_ENV_OFFSET_REDUND
int saveenv(void)
{
	size_t total;
	int ret = 0;
	nand_erase_options_t nand_erase_options;

	env_ptr->flags++;
	total = CFG_ENV_SIZE;

	nand_erase_options.length = CFG_ENV_RANGE;
	nand_erase_options.quiet = 0;
	nand_erase_options.jffs2 = 0;
	nand_erase_options.scrub = 0;

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

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

		puts ("Writing to Nand... ");
		ret = writeenv(CFG_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 /* ! CFG_ENV_OFFSET_REDUND */
int saveenv(void)
{
	size_t total;
	int ret = 0;
	nand_erase_options_t nand_erase_options;

	nand_erase_options.length = CFG_ENV_RANGE;
	nand_erase_options.quiet = 0;
	nand_erase_options.jffs2 = 0;
	nand_erase_options.scrub = 0;
	nand_erase_options.offset = CFG_ENV_OFFSET;

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

	puts ("Writing to Nand... ");
	total = CFG_ENV_SIZE;
	if (writeenv(CFG_ENV_OFFSET, (u_char *) env_ptr)) {
		puts("FAILED!\n");
		return 1;
	}

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

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

	u_char *char_ptr;

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

	while (amount_loaded < CFG_ENV_SIZE && offset < end) {
		if (nand_block_isbad(&nand_info[0], offset)) {
			offset += blocksize;
		} else {
			char_ptr = &buf[amount_loaded];
			if (nand_read(&nand_info[0], offset, &len, char_ptr))
				return 1;
			offset += blocksize;
			amount_loaded += len;
		}
	}
	if (amount_loaded != CFG_ENV_SIZE)
		return 1;

	return 0;
}

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

	total = CFG_ENV_SIZE;

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

	if (readenv(CFG_ENV_OFFSET, (u_char *) tmp_env1))
		puts("No Valid Environment Area Found\n");
	if (readenv(CFG_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)
		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 /* ! CFG_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(CFG_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 /* CFG_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
Commit	Line	Data
	1	/*
	2	* (C) Copyright 2008
	3	* Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
	4	*
	5	* (C) Copyright 2004
	6	* Jian Zhang, Texas Instruments, jzhang@ti.com.
	7
	8	* (C) Copyright 2000-2006
	9	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	10	*
	11	* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	12	* Andreas Heppel <aheppel@sysgo.de>
	13
	14	* See file CREDITS for list of people who contributed to this
	15	* project.
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License as
	19	* published by the Free Software Foundation; either version 2 of
	20	* the License, or (at your option) any later version.
	21	*
	22	* This program is distributed in the hope that it will be useful,
	23	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	24	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	25	* GNU General Public License for more details.
	26	*
	27	* You should have received a copy of the GNU General Public License
	28	* along with this program; if not, write to the Free Software
	29	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	30	* MA 02111-1307 USA
	31	*/
	32
	33	/* #define DEBUG */
	34
	35	#include <common.h>
	36	#include <command.h>
	37	#include <environment.h>
	38	#include <linux/stddef.h>
	39	#include <malloc.h>
	40	#include <nand.h>
	41
	42	#if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)
	43	#define CMD_SAVEENV
	44	#elif defined(CFG_ENV_OFFSET_REDUND)
	45	#error Cannot use CFG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_NAND
	46	#endif
	47
	48	#if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
	49	#error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
	50	#endif
	51
	52	#ifdef CONFIG_INFERNO
	53	#error CONFIG_INFERNO not supported yet
	54	#endif
	55
	56	#ifndef CFG_ENV_RANGE
	57	#define CFG_ENV_RANGE CFG_ENV_SIZE
	58	#endif
	59
	60	int nand_legacy_rw (struct nand_chip* nand, int cmd,
	61	size_t start, size_t len,
	62	size_t * retlen, u_char * buf);
	63
	64	/* references to names in env_common.c */
	65	extern uchar default_environment[];
	66	extern int default_environment_size;
	67
	68	char * env_name_spec = "NAND";
	69
	70
	71	#ifdef ENV_IS_EMBEDDED
	72	extern uchar environment[];
	73	env_t env_ptr = (env_t )(&environment[0]);
	74	#else /* ! ENV_IS_EMBEDDED */
	75	env_t *env_ptr = 0;
	76	#endif /* ENV_IS_EMBEDDED */
	77
	78
	79	/* local functions */
	80	#if !defined(ENV_IS_EMBEDDED)
	81	static void use_default(void);
	82	#endif
	83
	84	DECLARE_GLOBAL_DATA_PTR;
	85
	86	uchar env_get_char_spec (int index)
	87	{
	88	return ( ((uchar )(gd->env_addr + index)) );
	89	}
	90
	91
	92	/* this is called before nand_init()
	93	* so we can't read Nand to validate env data.
	94	* Mark it OK for now. env_relocate() in env_common.c
	95	* will call our relocate function which does the real
	96	* validation.
	97	*
	98	* When using a NAND boot image (like sequoia_nand), the environment
	99	* can be embedded or attached to the U-Boot image in NAND flash. This way
	100	* the SPL loads not only the U-Boot image from NAND but also the
	101	* environment.
	102	*/
	103	int env_init(void)
	104	{
	105	#if defined(ENV_IS_EMBEDDED)
	106	size_t total;
	107	int crc1_ok = 0, crc2_ok = 0;
	108	env_t tmp_env1, tmp_env2;
	109
	110	total = CFG_ENV_SIZE;
	111
	112	tmp_env1 = env_ptr;
	113	tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);
	114
	115	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	116	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	117
	118	if (!crc1_ok && !crc2_ok)
	119	gd->env_valid = 0;
	120	else if(crc1_ok && !crc2_ok)
	121	gd->env_valid = 1;
	122	else if(!crc1_ok && crc2_ok)
	123	gd->env_valid = 2;
	124	else {
	125	/* both ok - check serial */
	126	if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
	127	gd->env_valid = 2;
	128	else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
	129	gd->env_valid = 1;
	130	else if(tmp_env1->flags > tmp_env2->flags)
	131	gd->env_valid = 1;
	132	else if(tmp_env2->flags > tmp_env1->flags)
	133	gd->env_valid = 2;
	134	else /* flags are equal - almost impossible */
	135	gd->env_valid = 1;
	136	}
	137
	138	if (gd->env_valid == 1)
	139	env_ptr = tmp_env1;
	140	else if (gd->env_valid == 2)
	141	env_ptr = tmp_env2;
	142	#else /* ENV_IS_EMBEDDED */
	143	gd->env_addr = (ulong)&default_environment[0];
	144	gd->env_valid = 1;
	145	#endif /* ENV_IS_EMBEDDED */
	146
	147	return (0);
	148	}
	149
	150	#ifdef CMD_SAVEENV
	151	/*
	152	* The legacy NAND code saved the environment in the first NAND device i.e.,
	153	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	154	*/
	155	int writeenv(size_t offset, u_char *buf)
	156	{
	157	size_t end = offset + CFG_ENV_RANGE;
	158	size_t amount_saved = 0;
	159	size_t blocksize, len;
	160
	161	u_char *char_ptr;
	162
	163	blocksize = nand_info[0].erasesize;
	164	len = min(blocksize, CFG_ENV_SIZE);
	165
	166	while (amount_saved < CFG_ENV_SIZE && offset < end) {
	167	if (nand_block_isbad(&nand_info[0], offset)) {
	168	offset += blocksize;
	169	} else {
	170	char_ptr = &buf[amount_saved];
	171	if (nand_write(&nand_info[0], offset, &len,
	172	char_ptr))
	173	return 1;
	174	offset += blocksize;
	175	amount_saved += len;
	176	}
	177	}
	178	if (amount_saved != CFG_ENV_SIZE)
	179	return 1;
	180
	181	return 0;
	182	}
	183	#ifdef CFG_ENV_OFFSET_REDUND
	184	int saveenv(void)
	185	{
	186	size_t total;
	187	int ret = 0;
	188	nand_erase_options_t nand_erase_options;
	189
	190	env_ptr->flags++;
	191	total = CFG_ENV_SIZE;
	192
	193	nand_erase_options.length = CFG_ENV_RANGE;
	194	nand_erase_options.quiet = 0;
	195	nand_erase_options.jffs2 = 0;
	196	nand_erase_options.scrub = 0;
	197
	198	if (CFG_ENV_RANGE < CFG_ENV_SIZE)
	199	return 1;
	200	if(gd->env_valid == 1) {
	201	puts ("Erasing redundant Nand...\n");
	202	nand_erase_options.offset = CFG_ENV_OFFSET_REDUND;
	203	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
	204	return 1;
	205
	206	puts ("Writing to redundant Nand... ");
	207	ret = writeenv(CFG_ENV_OFFSET_REDUND, (u_char *) env_ptr);
	208	} else {
	209	puts ("Erasing Nand...\n");
	210	nand_erase_options.offset = CFG_ENV_OFFSET;
	211	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
	212	return 1;
	213
	214	puts ("Writing to Nand... ");
	215	ret = writeenv(CFG_ENV_OFFSET, (u_char *) env_ptr);
	216	}
	217	if (ret) {
	218	puts("FAILED!\n");
	219	return 1;
	220	}
	221
	222	puts ("done\n");
	223	gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
	224	return ret;
	225	}
	226	#else /* ! CFG_ENV_OFFSET_REDUND */
	227	int saveenv(void)
	228	{
	229	size_t total;
	230	int ret = 0;
	231	nand_erase_options_t nand_erase_options;
	232
	233	nand_erase_options.length = CFG_ENV_RANGE;
	234	nand_erase_options.quiet = 0;
	235	nand_erase_options.jffs2 = 0;
	236	nand_erase_options.scrub = 0;
	237	nand_erase_options.offset = CFG_ENV_OFFSET;
	238
	239	if (CFG_ENV_RANGE < CFG_ENV_SIZE)
	240	return 1;
	241	puts ("Erasing Nand...\n");
	242	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
	243	return 1;
	244
	245	puts ("Writing to Nand... ");
	246	total = CFG_ENV_SIZE;
	247	if (writeenv(CFG_ENV_OFFSET, (u_char *) env_ptr)) {
	248	puts("FAILED!\n");
	249	return 1;
	250	}
	251
	252	puts ("done\n");
	253	return ret;
	254	}
	255	#endif /* CFG_ENV_OFFSET_REDUND */
	256	#endif /* CMD_SAVEENV */
	257
	258	int readenv (size_t offset, u_char * buf)
	259	{
	260	size_t end = offset + CFG_ENV_RANGE;
	261	size_t amount_loaded = 0;
	262	size_t blocksize, len;
	263
	264	u_char *char_ptr;
	265
	266	blocksize = nand_info[0].erasesize;
	267	len = min(blocksize, CFG_ENV_SIZE);
	268
	269	while (amount_loaded < CFG_ENV_SIZE && offset < end) {
	270	if (nand_block_isbad(&nand_info[0], offset)) {
	271	offset += blocksize;
	272	} else {
	273	char_ptr = &buf[amount_loaded];
	274	if (nand_read(&nand_info[0], offset, &len, char_ptr))
	275	return 1;
	276	offset += blocksize;
	277	amount_loaded += len;
	278	}
	279	}
	280	if (amount_loaded != CFG_ENV_SIZE)
	281	return 1;
	282
	283	return 0;
	284	}
	285
	286	#ifdef CFG_ENV_OFFSET_REDUND
	287	void env_relocate_spec (void)
	288	{
	289	#if !defined(ENV_IS_EMBEDDED)
	290	size_t total;
	291	int crc1_ok = 0, crc2_ok = 0;
	292	env_t tmp_env1, tmp_env2;
	293
	294	total = CFG_ENV_SIZE;
	295
	296	tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
	297	tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
	298
	299	if (readenv(CFG_ENV_OFFSET, (u_char *) tmp_env1))
	300	puts("No Valid Environment Area Found\n");
	301	if (readenv(CFG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
	302	puts("No Valid Reundant Environment Area Found\n");
	303
	304	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	305	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	306
	307	if(!crc1_ok && !crc2_ok)
	308	return use_default();
	309	else if(crc1_ok && !crc2_ok)
	310	gd->env_valid = 1;
	311	else if(!crc1_ok && crc2_ok)
	312	gd->env_valid = 2;
	313	else {
	314	/* both ok - check serial */
	315	if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
	316	gd->env_valid = 2;
	317	else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
	318	gd->env_valid = 1;
	319	else if(tmp_env1->flags > tmp_env2->flags)
	320	gd->env_valid = 1;
	321	else if(tmp_env2->flags > tmp_env1->flags)
	322	gd->env_valid = 2;
	323	else /* flags are equal - almost impossible */
	324	gd->env_valid = 1;
	325
	326	}
	327
	328	free(env_ptr);
	329	if(gd->env_valid == 1) {
	330	env_ptr = tmp_env1;
	331	free(tmp_env2);
	332	} else {
	333	env_ptr = tmp_env2;
	334	free(tmp_env1);
	335	}
	336
	337	#endif /* ! ENV_IS_EMBEDDED */
	338	}
	339	#else /* ! CFG_ENV_OFFSET_REDUND */
	340	/*
	341	* The legacy NAND code saved the environment in the first NAND device i.e.,
	342	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	343	*/
	344	void env_relocate_spec (void)
	345	{
	346	#if !defined(ENV_IS_EMBEDDED)
	347	int ret;
	348
	349	ret = readenv(CFG_ENV_OFFSET, (u_char *) env_ptr);
	350	if (ret)
	351	return use_default();
	352
	353	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
	354	return use_default();
	355	#endif /* ! ENV_IS_EMBEDDED */
	356	}
	357	#endif /* CFG_ENV_OFFSET_REDUND */
	358
	359	#if !defined(ENV_IS_EMBEDDED)
	360	static void use_default()
	361	{
	362	puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
	363	set_default_env();
	364	}
	365	#endif