[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

/* 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)
{
	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 ((tmp_env1 == NULL) || (tmp_env2 == NULL)) {
		puts("Can't allocate buffers for environment\n");
		free (tmp_env1);
		free (tmp_env2);
		return use_default();
	}

	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
13a5695b WD	60	/* references to names in env_common.c */
13a5695b WD	61	extern uchar default_environment[];
13a5695b WD	62
	63	char * env_name_spec = "NAND";
	64
	65
b74ab737	66	#if defined(ENV_IS_EMBEDDED)
13a5695b WD	67	extern uchar environment[];
13a5695b WD	68	env_t env_ptr = (env_t )(&environment[0]);
b74ab737 GL	69	#elif defined(CONFIG_NAND_ENV_DST)
b74ab737 GL	70	env_t env_ptr = (env_t )CONFIG_NAND_ENV_DST;
13a5695b	71	#else /* ! ENV_IS_EMBEDDED */
49822e23	72	env_t *env_ptr = 0;
13a5695b WD	73	#endif /* ENV_IS_EMBEDDED */
	74
	75
	76	/* local functions */
d12ae808	77	#if !defined(ENV_IS_EMBEDDED)
13a5695b	78	static void use_default(void);
d12ae808	79	#endif
13a5695b	80
d87080b7	81	DECLARE_GLOBAL_DATA_PTR;
13a5695b WD	82
	83	uchar env_get_char_spec (int index)
	84	{
13a5695b WD	85	return ( ((uchar )(gd->env_addr + index)) );
	86	}
	87
	88
	89	/* this is called before nand_init()
	90	* so we can't read Nand to validate env data.
	91	* Mark it OK for now. env_relocate() in env_common.c
99c2b434 MZ	92	* will call our relocate function which does the real
99c2b434 MZ	93	* validation.
d12ae808 SR	94	*
	95	* When using a NAND boot image (like sequoia_nand), the environment
	96	* can be embedded or attached to the U-Boot image in NAND flash. This way
	97	* the SPL loads not only the U-Boot image from NAND but also the
	98	* environment.
13a5695b WD	99	*/
	100	int env_init(void)
	101	{
b74ab737	102	#if defined(ENV_IS_EMBEDDED) \|\| defined(CONFIG_NAND_ENV_DST)
d12ae808	103	int crc1_ok = 0, crc2_ok = 0;
b74ab737 GL	104	env_t *tmp_env1;
	105
	106	#ifdef CONFIG_ENV_OFFSET_REDUND
	107	env_t *tmp_env2;
d12ae808	108
0e8d1586	109	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
b74ab737 GL	110	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	111	#endif
	112
	113	tmp_env1 = env_ptr;
d12ae808 SR	114
d12ae808 SR	115	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
d12ae808	116
b74ab737 GL	117	if (!crc1_ok && !crc2_ok) {
b74ab737 GL	118	gd->env_addr = 0;
d12ae808	119	gd->env_valid = 0;
b74ab737 GL	120
	121	return 0;
	122	} else if (crc1_ok && !crc2_ok) {
d12ae808	123	gd->env_valid = 1;
b74ab737 GL	124	}
	125	#ifdef CONFIG_ENV_OFFSET_REDUND
	126	else if (!crc1_ok && crc2_ok) {
d12ae808	127	gd->env_valid = 2;
b74ab737	128	} else {
d12ae808 SR	129	/* both ok - check serial */
	130	if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
	131	gd->env_valid = 2;
	132	else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
	133	gd->env_valid = 1;
	134	else if(tmp_env1->flags > tmp_env2->flags)
	135	gd->env_valid = 1;
	136	else if(tmp_env2->flags > tmp_env1->flags)
	137	gd->env_valid = 2;
	138	else /* flags are equal - almost impossible */
	139	gd->env_valid = 1;
	140	}
	141
b74ab737 GL	142	if (gd->env_valid == 2)
	143	env_ptr = tmp_env2;
	144	else
	145	#endif
d12ae808 SR	146	if (gd->env_valid == 1)
d12ae808 SR	147	env_ptr = tmp_env1;
b74ab737 GL	148
	149	gd->env_addr = (ulong)env_ptr->data;
	150
	151	#else /* ENV_IS_EMBEDDED \|\| CONFIG_NAND_ENV_DST */
e443c944	152	gd->env_addr = (ulong)&default_environment[0];
13a5695b	153	gd->env_valid = 1;
b74ab737	154	#endif /* ENV_IS_EMBEDDED \|\| CONFIG_NAND_ENV_DST */
13a5695b WD	155
	156	return (0);
	157	}
	158
	159	#ifdef CMD_SAVEENV
addb2e16 BS	160	/*
	161	* The legacy NAND code saved the environment in the first NAND device i.e.,
	162	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	163	*/
cc49cade SW	164	int writeenv(size_t offset, u_char *buf)
cc49cade SW	165	{
0e8d1586	166	size_t end = offset + CONFIG_ENV_RANGE;
cc49cade	167	size_t amount_saved = 0;
c3db8c64	168	size_t blocksize, len;
cc49cade SW	169
	170	u_char *char_ptr;
	171
	172	blocksize = nand_info[0].erasesize;
0e8d1586	173	len = min(blocksize, CONFIG_ENV_SIZE);
cc49cade	174
0e8d1586	175	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
cc49cade SW	176	if (nand_block_isbad(&nand_info[0], offset)) {
	177	offset += blocksize;
	178	} else {
	179	char_ptr = &buf[amount_saved];
c3db8c64	180	if (nand_write(&nand_info[0], offset, &len,
cc49cade SW	181	char_ptr))
	182	return 1;
	183	offset += blocksize;
c3db8c64	184	amount_saved += len;
cc49cade SW	185	}
cc49cade SW	186	}
0e8d1586	187	if (amount_saved != CONFIG_ENV_SIZE)
cc49cade SW	188	return 1;
	189
	190	return 0;
	191	}
0e8d1586	192	#ifdef CONFIG_ENV_OFFSET_REDUND
13a5695b WD	193	int saveenv(void)
13a5695b WD	194	{
2770bcb2	195	int ret = 0;
cc49cade	196	nand_erase_options_t nand_erase_options;
e443c944	197
e443c944	198	env_ptr->flags++;
e443c944	199
0e8d1586	200	nand_erase_options.length = CONFIG_ENV_RANGE;
cc49cade SW	201	nand_erase_options.quiet = 0;
	202	nand_erase_options.jffs2 = 0;
	203	nand_erase_options.scrub = 0;
	204
0e8d1586	205	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
cc49cade	206	return 1;
e443c944	207	if(gd->env_valid == 1) {
cc49cade	208	puts ("Erasing redundant Nand...\n");
0e8d1586	209	nand_erase_options.offset = CONFIG_ENV_OFFSET_REDUND;
cc49cade	210	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
e443c944	211	return 1;
cc49cade	212
e443c944	213	puts ("Writing to redundant Nand... ");
0e8d1586	214	ret = writeenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) env_ptr);
e443c944	215	} else {
cc49cade	216	puts ("Erasing Nand...\n");
0e8d1586	217	nand_erase_options.offset = CONFIG_ENV_OFFSET;
cc49cade	218	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
e443c944 MK	219	return 1;
	220
	221	puts ("Writing to Nand... ");
0e8d1586	222	ret = writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
e443c944	223	}
cc49cade SW	224	if (ret) {
cc49cade SW	225	puts("FAILED!\n");
e443c944	226	return 1;
cc49cade	227	}
e443c944 MK	228
	229	puts ("done\n");
	230	gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
	231	return ret;
	232	}
0e8d1586	233	#else /* ! CONFIG_ENV_OFFSET_REDUND */
e443c944 MK	234	int saveenv(void)
e443c944 MK	235	{
d52fb7e3	236	int ret = 0;
9e4006bc	237	nand_erase_options_t nand_erase_options;
e093a247	238
0e8d1586	239	nand_erase_options.length = CONFIG_ENV_RANGE;
cc49cade SW	240	nand_erase_options.quiet = 0;
	241	nand_erase_options.jffs2 = 0;
	242	nand_erase_options.scrub = 0;
0e8d1586	243	nand_erase_options.offset = CONFIG_ENV_OFFSET;
cc49cade	244
0e8d1586	245	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
cc49cade SW	246	return 1;
	247	puts ("Erasing Nand...\n");
	248	if (nand_erase_opts(&nand_info[0], &nand_erase_options))
addb2e16	249	return 1;
13a5695b WD	250
13a5695b WD	251	puts ("Writing to Nand... ");
0e8d1586	252	if (writeenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr)) {
cc49cade	253	puts("FAILED!\n");
13a5695b	254	return 1;
cc49cade	255	}
13a5695b	256
addb2e16 BS	257	puts ("done\n");
addb2e16 BS	258	return ret;
13a5695b	259	}
0e8d1586	260	#endif /* CONFIG_ENV_OFFSET_REDUND */
13a5695b WD	261	#endif /* CMD_SAVEENV */
13a5695b WD	262
cc49cade SW	263	int readenv (size_t offset, u_char * buf)
cc49cade SW	264	{
0e8d1586	265	size_t end = offset + CONFIG_ENV_RANGE;
cc49cade	266	size_t amount_loaded = 0;
c3db8c64	267	size_t blocksize, len;
cc49cade SW	268
	269	u_char *char_ptr;
	270
	271	blocksize = nand_info[0].erasesize;
0e8d1586	272	len = min(blocksize, CONFIG_ENV_SIZE);
cc49cade	273
0e8d1586	274	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
cc49cade SW	275	if (nand_block_isbad(&nand_info[0], offset)) {
	276	offset += blocksize;
	277	} else {
	278	char_ptr = &buf[amount_loaded];
c3db8c64	279	if (nand_read(&nand_info[0], offset, &len, char_ptr))
cc49cade SW	280	return 1;
cc49cade SW	281	offset += blocksize;
c3db8c64	282	amount_loaded += len;
cc49cade SW	283	}
cc49cade SW	284	}
0e8d1586	285	if (amount_loaded != CONFIG_ENV_SIZE)
cc49cade SW	286	return 1;
	287
	288	return 0;
	289	}
	290
0e8d1586	291	#ifdef CONFIG_ENV_OFFSET_REDUND
e443c944 MK	292	void env_relocate_spec (void)
	293	{
	294	#if !defined(ENV_IS_EMBEDDED)
2770bcb2	295	int crc1_ok = 0, crc2_ok = 0;
e443c944 MK	296	env_t tmp_env1, tmp_env2;
e443c944 MK	297
0e8d1586 JCPV	298	tmp_env1 = (env_t *) malloc(CONFIG_ENV_SIZE);
0e8d1586 JCPV	299	tmp_env2 = (env_t *) malloc(CONFIG_ENV_SIZE);
e443c944	300
15b86c3d WD	301	if ((tmp_env1 == NULL) \|\| (tmp_env2 == NULL)) {
	302	puts("Can't allocate buffers for environment\n");
	303	free (tmp_env1);
	304	free (tmp_env2);
	305	return use_default();
	306	}
	307
0e8d1586	308	if (readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1))
cc49cade	309	puts("No Valid Environment Area Found\n");
0e8d1586	310	if (readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2))
cc49cade	311	puts("No Valid Reundant Environment Area Found\n");
e443c944 MK	312
	313	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	314	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	315
5a9427dc	316	if(!crc1_ok && !crc2_ok) {
	317	free(tmp_env1);
	318	free(tmp_env2);
e443c944	319	return use_default();
5a9427dc	320	} else if(crc1_ok && !crc2_ok)
e443c944 MK	321	gd->env_valid = 1;
	322	else if(!crc1_ok && crc2_ok)
	323	gd->env_valid = 2;
	324	else {
	325	/* both ok - check serial */
	326	if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
	327	gd->env_valid = 2;
	328	else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
	329	gd->env_valid = 1;
	330	else if(tmp_env1->flags > tmp_env2->flags)
	331	gd->env_valid = 1;
	332	else if(tmp_env2->flags > tmp_env1->flags)
	333	gd->env_valid = 2;
	334	else /* flags are equal - almost impossible */
	335	gd->env_valid = 1;
13a5695b	336
e443c944 MK	337	}
	338
	339	free(env_ptr);
	340	if(gd->env_valid == 1) {
	341	env_ptr = tmp_env1;
	342	free(tmp_env2);
	343	} else {
	344	env_ptr = tmp_env2;
	345	free(tmp_env1);
	346	}
	347
	348	#endif /* ! ENV_IS_EMBEDDED */
	349	}
0e8d1586	350	#else /* ! CONFIG_ENV_OFFSET_REDUND */
addb2e16 BS	351	/*
	352	* The legacy NAND code saved the environment in the first NAND device i.e.,
	353	* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
	354	*/
13a5695b WD	355	void env_relocate_spec (void)
	356	{
	357	#if !defined(ENV_IS_EMBEDDED)
d52fb7e3	358	int ret;
13a5695b	359
0e8d1586	360	ret = readenv(CONFIG_ENV_OFFSET, (u_char *) env_ptr);
c3db8c64	361	if (ret)
13a5695b WD	362	return use_default();
	363
	364	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
	365	return use_default();
	366	#endif /* ! ENV_IS_EMBEDDED */
13a5695b	367	}
0e8d1586	368	#endif /* CONFIG_ENV_OFFSET_REDUND */
13a5695b	369
d12ae808	370	#if !defined(ENV_IS_EMBEDDED)
13a5695b WD	371	static void use_default()
13a5695b WD	372	{
13a5695b	373	puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
5bb12dbd	374	set_default_env();
13a5695b	375	}
d12ae808	376	#endif