[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_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

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)
	int crc1_ok = 0, crc2_ok = 0;
	env_t *tmp_env1, *tmp_env2;

	tmp_env1 = env_ptr;
	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_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 + CONFIG_ENV_RANGE;
	size_t amount_saved = 0;
	size_t blocksize, len;

	u_char *char_ptr;

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

	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 = 0;
	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 = 0;
	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;
	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_ptr)) {
		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)
{
	size_t end = offset + CONFIG_ENV_RANGE;
	size_t amount_loaded = 0;
	size_t blocksize, len;

	u_char *char_ptr;

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

	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(&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
Commit	Line	Data
13a5695b	1	/*
cc49cade SW	2	* (C) Copyright 2008
	3	* Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
	4	*
13a5695b WD	5	* (C) Copyright 2004
	6	* Jian Zhang, Texas Instruments, jzhang@ti.com.
	7
d12ae808	8	* (C) Copyright 2000-2006
13a5695b WD	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>
13a5695b WD	36	#include <command.h>
	37	#include <environment.h>
	38	#include <linux/stddef.h>
e443c944	39	#include <malloc.h>
addb2e16	40	#include <nand.h>
13a5695b	41
bdab39d3	42	#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND)
13a5695b	43	#define CMD_SAVEENV
0e8d1586	44	#elif defined(CONFIG_ENV_OFFSET_REDUND)
bdab39d3	45	#error Cannot use CONFIG_ENV_OFFSET_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
13a5695b WD	46	#endif
13a5695b WD	47
0e8d1586 JCPV	48	#if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
0e8d1586 JCPV	49	#error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
13a5695b WD	50	#endif
13a5695b WD	51
13a5695b WD	52	#ifdef CONFIG_INFERNO
	53	#error CONFIG_INFERNO not supported yet
	54	#endif
	55
0e8d1586 JCPV	56	#ifndef CONFIG_ENV_RANGE
0e8d1586 JCPV	57	#define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
cc49cade SW	58	#endif
cc49cade SW	59
addb2e16	60	int nand_legacy_rw (struct nand_chip* nand, int cmd,
13a5695b WD	61	size_t start, size_t len,
13a5695b WD	62	size_t * retlen, u_char * buf);
addb2e16	63
13a5695b WD	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 */
49822e23	75	env_t *env_ptr = 0;
13a5695b WD	76	#endif /* ENV_IS_EMBEDDED */
	77
	78
	79	/* local functions */
d12ae808	80	#if !defined(ENV_IS_EMBEDDED)
13a5695b	81	static void use_default(void);
d12ae808	82	#endif
13a5695b	83
d87080b7	84	DECLARE_GLOBAL_DATA_PTR;
13a5695b WD	85
	86	uchar env_get_char_spec (int index)
	87	{
13a5695b WD	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
99c2b434 MZ	95	* will call our relocate function which does the real
99c2b434 MZ	96	* validation.
d12ae808 SR	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.
13a5695b WD	102	*/
	103	int env_init(void)
	104	{
d12ae808	105	#if defined(ENV_IS_EMBEDDED)
d12ae808 SR	106	int crc1_ok = 0, crc2_ok = 0;
	107	env_t tmp_env1, tmp_env2;
	108
d12ae808	109	tmp_env1 = env_ptr;
0e8d1586	110	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
d12ae808 SR	111
	112	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	113	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	114
	115	if (!crc1_ok && !crc2_ok)
	116	gd->env_valid = 0;
	117	else if(crc1_ok && !crc2_ok)
	118	gd->env_valid = 1;
	119	else if(!crc1_ok && crc2_ok)
	120	gd->env_valid = 2;
	121	else {
	122	/* both ok - check serial */
	123	if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
	124	gd->env_valid = 2;
	125	else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
	126	gd->env_valid = 1;
	127	else if(tmp_env1->flags > tmp_env2->flags)
	128	gd->env_valid = 1;
	129	else if(tmp_env2->flags > tmp_env1->flags)
	130	gd->env_valid = 2;
	131	else /* flags are equal - almost impossible */
	132	gd->env_valid = 1;
	133	}
	134
	135	if (gd->env_valid == 1)
	136	env_ptr = tmp_env1;
	137	else if (gd->env_valid == 2)
	138	env_ptr = tmp_env2;
	139	#else /* ENV_IS_EMBEDDED */
e443c944	140	gd->env_addr = (ulong)&default_environment[0];
13a5695b	141	gd->env_valid = 1;
d12ae808	142	#endif /* ENV_IS_EMBEDDED */
13a5695b WD	143
	144	return (0);
	145	}
	146
	147	#ifdef CMD_SAVEENV
addb2e16 BS	148	/*
	149	* The legacy NAND code saved the environment in the first NAND device i.e.,
	150	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	151	*/
cc49cade SW	152	int writeenv(size_t offset, u_char *buf)
cc49cade SW	153	{
0e8d1586	154	size_t end = offset + CONFIG_ENV_RANGE;
cc49cade	155	size_t amount_saved = 0;
c3db8c64	156	size_t blocksize, len;
cc49cade SW	157
	158	u_char *char_ptr;
	159
	160	blocksize = nand_info[0].erasesize;
0e8d1586	161	len = min(blocksize, CONFIG_ENV_SIZE);
cc49cade	162
0e8d1586	163	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
cc49cade SW	164	if (nand_block_isbad(&nand_info[0], offset)) {
	165	offset += blocksize;
	166	} else {
	167	char_ptr = &buf[amount_saved];
c3db8c64	168	if (nand_write(&nand_info[0], offset, &len,
cc49cade SW	169	char_ptr))
	170	return 1;
	171	offset += blocksize;
c3db8c64	172	amount_saved += len;
cc49cade SW	173	}
cc49cade SW	174	}
0e8d1586	175	if (amount_saved != CONFIG_ENV_SIZE)
cc49cade SW	176	return 1;
	177
	178	return 0;
	179	}
0e8d1586	180	#ifdef CONFIG_ENV_OFFSET_REDUND
13a5695b WD	181	int saveenv(void)
13a5695b WD	182	{
2770bcb2	183	int ret = 0;
cc49cade	184	nand_erase_options_t nand_erase_options;
e443c944	185
e443c944	186	env_ptr->flags++;
e443c944	187
0e8d1586	188	nand_erase_options.length = CONFIG_ENV_RANGE;
cc49cade SW	189	nand_erase_options.quiet = 0;
	190	nand_erase_options.jffs2 = 0;
	191	nand_erase_options.scrub = 0;
	192
0e8d1586	193	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
cc49cade	194	return 1;
e443c944	195	if(gd->env_valid == 1) {
cc49cade	196	puts ("Erasing redundant Nand...\n");
0e8d1586	197	nand_erase_options.offset = CONFIG_ENV_OFFSET_REDUND;
cc49cade	198	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
e443c944	199	return 1;
cc49cade	200
e443c944	201	puts ("Writing to redundant Nand... ");
0e8d1586	202	ret = writeenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) env_ptr);
e443c944	203	} else {
cc49cade	204	puts ("Erasing Nand...\n");
0e8d1586	205	nand_erase_options.offset = CONFIG_ENV_OFFSET;
cc49cade	206	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
e443c944 MK	207	return 1;
	208
	209	puts ("Writing to Nand... ");
0e8d1586	210	ret = writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
e443c944	211	}
cc49cade SW	212	if (ret) {
cc49cade SW	213	puts("FAILED!\n");
e443c944	214	return 1;
cc49cade	215	}
e443c944 MK	216
	217	puts ("done\n");
	218	gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
	219	return ret;
	220	}
0e8d1586	221	#else /* ! CONFIG_ENV_OFFSET_REDUND */
e443c944 MK	222	int saveenv(void)
e443c944 MK	223	{
d52fb7e3	224	int ret = 0;
9e4006bc	225	nand_erase_options_t nand_erase_options;
e093a247	226
0e8d1586	227	nand_erase_options.length = CONFIG_ENV_RANGE;
cc49cade SW	228	nand_erase_options.quiet = 0;
	229	nand_erase_options.jffs2 = 0;
	230	nand_erase_options.scrub = 0;
0e8d1586	231	nand_erase_options.offset = CONFIG_ENV_OFFSET;
cc49cade	232
0e8d1586	233	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
cc49cade SW	234	return 1;
	235	puts ("Erasing Nand...\n");
	236	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
addb2e16	237	return 1;
13a5695b WD	238
13a5695b WD	239	puts ("Writing to Nand... ");
0e8d1586	240	if (writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr)) {
cc49cade	241	puts("FAILED!\n");
13a5695b	242	return 1;
cc49cade	243	}
13a5695b	244
addb2e16 BS	245	puts ("done\n");
addb2e16 BS	246	return ret;
13a5695b	247	}
0e8d1586	248	#endif /* CONFIG_ENV_OFFSET_REDUND */
13a5695b WD	249	#endif /* CMD_SAVEENV */
13a5695b WD	250
cc49cade SW	251	int readenv (size_t offset, u_char * buf)
cc49cade SW	252	{
0e8d1586	253	size_t end = offset + CONFIG_ENV_RANGE;
cc49cade	254	size_t amount_loaded = 0;
c3db8c64	255	size_t blocksize, len;
cc49cade SW	256
	257	u_char *char_ptr;
	258
	259	blocksize = nand_info[0].erasesize;
0e8d1586	260	len = min(blocksize, CONFIG_ENV_SIZE);
cc49cade	261
0e8d1586	262	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
cc49cade SW	263	if (nand_block_isbad(&nand_info[0], offset)) {
	264	offset += blocksize;
	265	} else {
	266	char_ptr = &buf[amount_loaded];
c3db8c64	267	if (nand_read(&nand_info[0], offset, &len, char_ptr))
cc49cade SW	268	return 1;
cc49cade SW	269	offset += blocksize;
c3db8c64	270	amount_loaded += len;
cc49cade SW	271	}
cc49cade SW	272	}
0e8d1586	273	if (amount_loaded != CONFIG_ENV_SIZE)
cc49cade SW	274	return 1;
	275
	276	return 0;
	277	}
	278
0e8d1586	279	#ifdef CONFIG_ENV_OFFSET_REDUND
e443c944 MK	280	void env_relocate_spec (void)
	281	{
	282	#if !defined(ENV_IS_EMBEDDED)
2770bcb2	283	int crc1_ok = 0, crc2_ok = 0;
e443c944 MK	284	env_t tmp_env1, tmp_env2;
e443c944 MK	285
0e8d1586 JCPV	286	tmp_env1 = (env_t *) malloc(CONFIG_ENV_SIZE);
0e8d1586 JCPV	287	tmp_env2 = (env_t *) malloc(CONFIG_ENV_SIZE);
e443c944	288
0e8d1586	289	if (readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1))
cc49cade	290	puts("No Valid Environment Area Found\n");
0e8d1586	291	if (readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
cc49cade	292	puts("No Valid Reundant Environment Area Found\n");
e443c944 MK	293
	294	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	295	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	296
5a9427dc	297	if(!crc1_ok && !crc2_ok) {
	298	free(tmp_env1);
	299	free(tmp_env2);
e443c944	300	return use_default();
5a9427dc	301	} else if(crc1_ok && !crc2_ok)
e443c944 MK	302	gd->env_valid = 1;
	303	else if(!crc1_ok && crc2_ok)
	304	gd->env_valid = 2;
	305	else {
	306	/* both ok - check serial */
	307	if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
	308	gd->env_valid = 2;
	309	else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
	310	gd->env_valid = 1;
	311	else if(tmp_env1->flags > tmp_env2->flags)
	312	gd->env_valid = 1;
	313	else if(tmp_env2->flags > tmp_env1->flags)
	314	gd->env_valid = 2;
	315	else /* flags are equal - almost impossible */
	316	gd->env_valid = 1;
13a5695b	317
e443c944 MK	318	}
	319
	320	free(env_ptr);
	321	if(gd->env_valid == 1) {
	322	env_ptr = tmp_env1;
	323	free(tmp_env2);
	324	} else {
	325	env_ptr = tmp_env2;
	326	free(tmp_env1);
	327	}
	328
	329	#endif /* ! ENV_IS_EMBEDDED */
	330	}
0e8d1586	331	#else /* ! CONFIG_ENV_OFFSET_REDUND */
addb2e16 BS	332	/*
	333	* The legacy NAND code saved the environment in the first NAND device i.e.,
	334	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	335	*/
13a5695b WD	336	void env_relocate_spec (void)
	337	{
	338	#if !defined(ENV_IS_EMBEDDED)
d52fb7e3	339	int ret;
13a5695b	340
0e8d1586	341	ret = readenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
c3db8c64	342	if (ret)
13a5695b WD	343	return use_default();
	344
	345	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
	346	return use_default();
	347	#endif /* ! ENV_IS_EMBEDDED */
13a5695b	348	}
0e8d1586	349	#endif /* CONFIG_ENV_OFFSET_REDUND */
13a5695b	350
d12ae808	351	#if !defined(ENV_IS_EMBEDDED)
13a5695b WD	352	static void use_default()
13a5695b WD	353	{
13a5695b	354	puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
5bb12dbd	355	set_default_env();
13a5695b	356	}
d12ae808	357	#endif