[u-boot.git] / common / env_mmc.c

/*
 * (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/* #define DEBUG */

#include <common.h>

#include <command.h>
#include <environment.h>
#include <fdtdec.h>
#include <linux/stddef.h>
#include <malloc.h>
#include <memalign.h>
#include <mmc.h>
#include <search.h>
#include <errno.h>

#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

char *env_name_spec = "MMC";

#ifdef ENV_IS_EMBEDDED
env_t *env_ptr = &environment;
#else /* ! ENV_IS_EMBEDDED */
env_t *env_ptr;
#endif /* ENV_IS_EMBEDDED */

DECLARE_GLOBAL_DATA_PTR;

#if !defined(CONFIG_ENV_OFFSET)
#define CONFIG_ENV_OFFSET 0
#endif

#if CONFIG_IS_ENABLED(OF_CONTROL)
static inline s64 mmc_offset(int copy)
{
	const char *propname = "u-boot,mmc-env-offset";
	s64 defvalue = CONFIG_ENV_OFFSET;

#if defined(CONFIG_ENV_OFFSET_REDUND)
	if (copy) {
		propname = "u-boot,mmc-env-offset-redundant";
		defvalue = CONFIG_ENV_OFFSET_REDUND;
	}
#endif

	return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
}
#else
static inline s64 mmc_offset(int copy)
{
	s64 offset = CONFIG_ENV_OFFSET;

#if defined(CONFIG_ENV_OFFSET_REDUND)
	if (copy)
		offset = CONFIG_ENV_OFFSET_REDUND;
#endif
	return offset;
}
#endif

__weak int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
{
	s64 offset = mmc_offset(copy);

	if (offset < 0)
		offset += mmc->capacity;

	*env_addr = offset;

	return 0;
}

__weak int mmc_get_env_dev(void)
{
	return CONFIG_SYS_MMC_ENV_DEV;
}

int env_init(void)
{
	/* use default */
	gd->env_addr	= (ulong)&default_environment[0];
	gd->env_valid	= 1;

	return 0;
}

#ifdef CONFIG_SYS_MMC_ENV_PART
__weak uint mmc_get_env_part(struct mmc *mmc)
{
	return CONFIG_SYS_MMC_ENV_PART;
}

static unsigned char env_mmc_orig_hwpart;

static int mmc_set_env_part(struct mmc *mmc)
{
	uint part = mmc_get_env_part(mmc);
	int dev = mmc_get_env_dev();
	int ret = 0;

	env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
	ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
	if (ret)
		puts("MMC partition switch failed\n");

	return ret;
}
#else
static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
#endif

static const char *init_mmc_for_env(struct mmc *mmc)
{
	if (!mmc)
		return "!No MMC card found";

#ifndef CONFIG_BLK
	if (mmc_init(mmc))
		return "!MMC init failed";
#endif
	if (mmc_set_env_part(mmc))
		return "!MMC partition switch failed";

	return NULL;
}

static void fini_mmc_for_env(struct mmc *mmc)
{
#ifdef CONFIG_SYS_MMC_ENV_PART
	int dev = mmc_get_env_dev();

	blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
#endif
}

#ifdef CONFIG_CMD_SAVEENV
static inline int write_env(struct mmc *mmc, unsigned long size,
			    unsigned long offset, const void *buffer)
{
	uint blk_start, blk_cnt, n;
	struct blk_desc *desc = mmc_get_blk_desc(mmc);

	blk_start	= ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
	blk_cnt		= ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;

	n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);

	return (n == blk_cnt) ? 0 : -1;
}

#ifdef CONFIG_ENV_OFFSET_REDUND
static unsigned char env_flags;
#endif

int saveenv(void)
{
	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
	int dev = mmc_get_env_dev();
	struct mmc *mmc = find_mmc_device(dev);
	u32	offset;
	int	ret, copy = 0;
	const char *errmsg;

	errmsg = init_mmc_for_env(mmc);
	if (errmsg) {
		printf("%s\n", errmsg);
		return 1;
	}

	ret = env_export(env_new);
	if (ret)
		goto fini;

#ifdef CONFIG_ENV_OFFSET_REDUND
	env_new->flags	= ++env_flags; /* increase the serial */

	if (gd->env_valid == 1)
		copy = 1;
#endif

	if (mmc_get_env_addr(mmc, copy, &offset)) {
		ret = 1;
		goto fini;
	}

	printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
	if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
		puts("failed\n");
		ret = 1;
		goto fini;
	}

	puts("done\n");
	ret = 0;

#ifdef CONFIG_ENV_OFFSET_REDUND
	gd->env_valid = gd->env_valid == 2 ? 1 : 2;
#endif

fini:
	fini_mmc_for_env(mmc);
	return ret;
}
#endif /* CONFIG_CMD_SAVEENV */

static inline int read_env(struct mmc *mmc, unsigned long size,
			   unsigned long offset, const void *buffer)
{
	uint blk_start, blk_cnt, n;
	struct blk_desc *desc = mmc_get_blk_desc(mmc);

	blk_start	= ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
	blk_cnt		= ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;

	n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);

	return (n == blk_cnt) ? 0 : -1;
}

#ifdef CONFIG_ENV_OFFSET_REDUND
void env_relocate_spec(void)
{
#if !defined(ENV_IS_EMBEDDED)
	struct mmc *mmc;
	u32 offset1, offset2;
	int read1_fail = 0, read2_fail = 0;
	int crc1_ok = 0, crc2_ok = 0;
	env_t *ep;
	int ret;
	int dev = mmc_get_env_dev();
	const char *errmsg = NULL;

	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);

	mmc = find_mmc_device(dev);

	errmsg = init_mmc_for_env(mmc);
	if (errmsg) {
		ret = 1;
		goto err;
	}

	if (mmc_get_env_addr(mmc, 0, &offset1) ||
	    mmc_get_env_addr(mmc, 1, &offset2)) {
		ret = 1;
		goto fini;
	}

	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
	read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);

	if (read1_fail && read2_fail)
		puts("*** Error - No Valid Environment Area found\n");
	else if (read1_fail || read2_fail)
		puts("*** Warning - some problems detected "
		     "reading environment; recovered successfully\n");

	crc1_ok = !read1_fail &&
		(crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	crc2_ok = !read2_fail &&
		(crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);

	if (!crc1_ok && !crc2_ok) {
		errmsg = "!bad CRC";
		ret = 1;
		goto fini;
	} 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);
	ret = 0;

fini:
	fini_mmc_for_env(mmc);
err:
	if (ret)
		set_default_env(errmsg);
#endif
}
#else /* ! CONFIG_ENV_OFFSET_REDUND */
void env_relocate_spec(void)
{
#if !defined(ENV_IS_EMBEDDED)
	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
	struct mmc *mmc;
	u32 offset;
	int ret;
	int dev = mmc_get_env_dev();
	const char *errmsg;

	mmc = find_mmc_device(dev);

	errmsg = init_mmc_for_env(mmc);
	if (errmsg) {
		ret = 1;
		goto err;
	}

	if (mmc_get_env_addr(mmc, 0, &offset)) {
		ret = 1;
		goto fini;
	}

	if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
		errmsg = "!read failed";
		ret = 1;
		goto fini;
	}

	env_import(buf, 1);
	ret = 0;

fini:
	fini_mmc_for_env(mmc);
err:
	if (ret)
		set_default_env(errmsg);
#endif
}
#endif /* CONFIG_ENV_OFFSET_REDUND */
Commit	Line	Data
a8060359	1	/*
97039ab9	2	* (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
a8060359	3	*
3765b3e7	4	* SPDX-License-Identifier: GPL-2.0+
a8060359 TL	5	*/
	6
	7	/* #define DEBUG */
	8
	9	#include <common.h>
	10
	11	#include <command.h>
	12	#include <environment.h>
f8b8a554	13	#include <fdtdec.h>
a8060359 TL	14	#include <linux/stddef.h>
a8060359 TL	15	#include <malloc.h>
cf92e05c	16	#include <memalign.h>
a8060359	17	#include <mmc.h>
6d1d51b3	18	#include <search.h>
e79f4839	19	#include <errno.h>
a8060359	20
d196bd88 MH	21	#if defined(CONFIG_ENV_SIZE_REDUND) && \
	22	(CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
	23	#error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
	24	#endif
	25
a8060359 TL	26	char *env_name_spec = "MMC";
	27
	28	#ifdef ENV_IS_EMBEDDED
994bc671	29	env_t *env_ptr = &environment;
a8060359	30	#else /* ! ENV_IS_EMBEDDED */
e8db8f71	31	env_t *env_ptr;
a8060359 TL	32	#endif /* ENV_IS_EMBEDDED */
a8060359 TL	33
a8060359 TL	34	DECLARE_GLOBAL_DATA_PTR;
a8060359 TL	35
97039ab9 MH	36	#if !defined(CONFIG_ENV_OFFSET)
	37	#define CONFIG_ENV_OFFSET 0
	38	#endif
	39
f8b8a554 PT	40	#if CONFIG_IS_ENABLED(OF_CONTROL)
	41	static inline s64 mmc_offset(int copy)
	42	{
	43	const char *propname = "u-boot,mmc-env-offset";
	44	s64 defvalue = CONFIG_ENV_OFFSET;
	45
	46	#if defined(CONFIG_ENV_OFFSET_REDUND)
	47	if (copy) {
	48	propname = "u-boot,mmc-env-offset-redundant";
	49	defvalue = CONFIG_ENV_OFFSET_REDUND;
	50	}
	51	#endif
	52
	53	return fdtdec_get_config_int(gd->fdt_blob, propname, defvalue);
	54	}
	55	#else
	56	static inline s64 mmc_offset(int copy)
97039ab9	57	{
f8b8a554	58	s64 offset = CONFIG_ENV_OFFSET;
5c088ee8	59
f8b8a554	60	#if defined(CONFIG_ENV_OFFSET_REDUND)
d196bd88	61	if (copy)
5c088ee8	62	offset = CONFIG_ENV_OFFSET_REDUND;
d196bd88	63	#endif
f8b8a554 PT	64	return offset;
	65	}
	66	#endif
	67
	68	__weak int mmc_get_env_addr(struct mmc mmc, int copy, u32 env_addr)
	69	{
	70	s64 offset = mmc_offset(copy);
5c088ee8 SW	71
	72	if (offset < 0)
	73	offset += mmc->capacity;
	74
	75	*env_addr = offset;
	76
97039ab9 MH	77	return 0;
97039ab9 MH	78	}
97039ab9	79
e92029c0 CG	80	__weak int mmc_get_env_dev(void)
	81	{
	82	return CONFIG_SYS_MMC_ENV_DEV;
	83	}
	84
a8060359 TL	85	int env_init(void)
	86	{
	87	/* use default */
e8db8f71 IG	88	gd->env_addr = (ulong)&default_environment[0];
e8db8f71 IG	89	gd->env_valid = 1;
a8060359 TL	90
	91	return 0;
	92	}
	93
b9c8ccab	94	#ifdef CONFIG_SYS_MMC_ENV_PART
6e7b7df4 DL	95	__weak uint mmc_get_env_part(struct mmc *mmc)
	96	{
	97	return CONFIG_SYS_MMC_ENV_PART;
	98	}
	99
873cc1d7 SW	100	static unsigned char env_mmc_orig_hwpart;
873cc1d7 SW	101
6e7b7df4 DL	102	static int mmc_set_env_part(struct mmc *mmc)
	103	{
	104	uint part = mmc_get_env_part(mmc);
e92029c0	105	int dev = mmc_get_env_dev();
6e7b7df4	106	int ret = 0;
b9c8ccab	107
69f45cd5 SG	108	env_mmc_orig_hwpart = mmc_get_blk_desc(mmc)->hwpart;
69f45cd5 SG	109	ret = blk_select_hwpart_devnum(IF_TYPE_MMC, dev, part);
873cc1d7 SW	110	if (ret)
873cc1d7 SW	111	puts("MMC partition switch failed\n");
6e7b7df4 DL	112
	113	return ret;
	114	}
	115	#else
	116	static inline int mmc_set_env_part(struct mmc *mmc) {return 0; };
b9c8ccab TR	117	#endif
b9c8ccab TR	118
c75648d7	119	static const char init_mmc_for_env(struct mmc mmc)
6e7b7df4	120	{
c75648d7	121	if (!mmc)
a85da21f	122	return "!No MMC card found";
a8060359	123
e7017a3c	124	#ifndef CONFIG_BLK
c75648d7	125	if (mmc_init(mmc))
a85da21f	126	return "!MMC init failed";
e7017a3c	127	#endif
c75648d7	128	if (mmc_set_env_part(mmc))
a85da21f	129	return "!MMC partition switch failed";
a8060359	130
c75648d7	131	return NULL;
a8060359 TL	132	}
a8060359 TL	133
9404a5fc SW	134	static void fini_mmc_for_env(struct mmc *mmc)
	135	{
	136	#ifdef CONFIG_SYS_MMC_ENV_PART
e92029c0	137	int dev = mmc_get_env_dev();
b9c8ccab	138
69f45cd5	139	blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart);
9404a5fc SW	140	#endif
	141	}
	142
a8060359	143	#ifdef CONFIG_CMD_SAVEENV
e8db8f71 IG	144	static inline int write_env(struct mmc *mmc, unsigned long size,
e8db8f71 IG	145	unsigned long offset, const void *buffer)
a8060359 TL	146	{
a8060359 TL	147	uint blk_start, blk_cnt, n;
5461acba	148	struct blk_desc *desc = mmc_get_blk_desc(mmc);
a8060359	149
e8db8f71 IG	150	blk_start = ALIGN(offset, mmc->write_bl_len) / mmc->write_bl_len;
e8db8f71 IG	151	blk_cnt = ALIGN(size, mmc->write_bl_len) / mmc->write_bl_len;
a8060359	152
5461acba	153	n = blk_dwrite(desc, blk_start, blk_cnt, (u_char *)buffer);
a8060359 TL	154
	155	return (n == blk_cnt) ? 0 : -1;
	156	}
	157
d196bd88 MH	158	#ifdef CONFIG_ENV_OFFSET_REDUND
	159	static unsigned char env_flags;
	160	#endif
	161
a8060359 TL	162	int saveenv(void)
a8060359 TL	163	{
cd0f4fa1	164	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
e92029c0 CG	165	int dev = mmc_get_env_dev();
e92029c0 CG	166	struct mmc *mmc = find_mmc_device(dev);
e8db8f71	167	u32 offset;
d196bd88	168	int ret, copy = 0;
c75648d7	169	const char *errmsg;
a8060359	170
c75648d7 TH	171	errmsg = init_mmc_for_env(mmc);
	172	if (errmsg) {
	173	printf("%s\n", errmsg);
97039ab9	174	return 1;
c75648d7	175	}
97039ab9	176
7ce1526e MV	177	ret = env_export(env_new);
7ce1526e MV	178	if (ret)
9404a5fc	179	goto fini;
d196bd88 MH	180
	181	#ifdef CONFIG_ENV_OFFSET_REDUND
	182	env_new->flags = ++env_flags; /* increase the serial */
	183
	184	if (gd->env_valid == 1)
	185	copy = 1;
	186	#endif
	187
	188	if (mmc_get_env_addr(mmc, copy, &offset)) {
	189	ret = 1;
	190	goto fini;
	191	}
	192
e92029c0	193	printf("Writing to %sMMC(%d)... ", copy ? "redundant " : "", dev);
4036b630	194	if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)env_new)) {
a8060359	195	puts("failed\n");
9404a5fc SW	196	ret = 1;
9404a5fc SW	197	goto fini;
a8060359 TL	198	}
	199
	200	puts("done\n");
9404a5fc SW	201	ret = 0;
9404a5fc SW	202
d196bd88 MH	203	#ifdef CONFIG_ENV_OFFSET_REDUND
	204	gd->env_valid = gd->env_valid == 2 ? 1 : 2;
	205	#endif
	206
9404a5fc SW	207	fini:
	208	fini_mmc_for_env(mmc);
	209	return ret;
a8060359 TL	210	}
	211	#endif /* CONFIG_CMD_SAVEENV */
	212
e8db8f71 IG	213	static inline int read_env(struct mmc *mmc, unsigned long size,
e8db8f71 IG	214	unsigned long offset, const void *buffer)
a8060359 TL	215	{
a8060359 TL	216	uint blk_start, blk_cnt, n;
5461acba	217	struct blk_desc *desc = mmc_get_blk_desc(mmc);
a8060359	218
e8db8f71 IG	219	blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
e8db8f71 IG	220	blk_cnt = ALIGN(size, mmc->read_bl_len) / mmc->read_bl_len;
a8060359	221
5461acba	222	n = blk_dread(desc, blk_start, blk_cnt, (uchar *)buffer);
a8060359 TL	223
	224	return (n == blk_cnt) ? 0 : -1;
	225	}
	226
d196bd88 MH	227	#ifdef CONFIG_ENV_OFFSET_REDUND
	228	void env_relocate_spec(void)
	229	{
	230	#if !defined(ENV_IS_EMBEDDED)
b9c8ccab	231	struct mmc *mmc;
d196bd88 MH	232	u32 offset1, offset2;
	233	int read1_fail = 0, read2_fail = 0;
	234	int crc1_ok = 0, crc2_ok = 0;
452a2722	235	env_t *ep;
d196bd88	236	int ret;
e92029c0	237	int dev = mmc_get_env_dev();
c75648d7	238	const char *errmsg = NULL;
d196bd88	239
452a2722 MN	240	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env1, 1);
	241	ALLOC_CACHE_ALIGN_BUFFER(env_t, tmp_env2, 1);
	242
b9c8ccab TR	243	mmc = find_mmc_device(dev);
b9c8ccab TR	244
c75648d7 TH	245	errmsg = init_mmc_for_env(mmc);
c75648d7 TH	246	if (errmsg) {
d196bd88 MH	247	ret = 1;
	248	goto err;
	249	}
	250
	251	if (mmc_get_env_addr(mmc, 0, &offset1) \|\|
	252	mmc_get_env_addr(mmc, 1, &offset2)) {
	253	ret = 1;
	254	goto fini;
	255	}
	256
	257	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
	258	read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
	259
	260	if (read1_fail && read2_fail)
	261	puts("*** Error - No Valid Environment Area found\n");
	262	else if (read1_fail \|\| read2_fail)
	263	puts("*** Warning - some problems detected "
	264	"reading environment; recovered successfully\n");
	265
	266	crc1_ok = !read1_fail &&
	267	(crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
	268	crc2_ok = !read2_fail &&
	269	(crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
	270
	271	if (!crc1_ok && !crc2_ok) {
c75648d7	272	errmsg = "!bad CRC";
d196bd88 MH	273	ret = 1;
	274	goto fini;
	275	} else if (crc1_ok && !crc2_ok) {
	276	gd->env_valid = 1;
	277	} else if (!crc1_ok && crc2_ok) {
	278	gd->env_valid = 2;
	279	} else {
	280	/* both ok - check serial */
	281	if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
	282	gd->env_valid = 2;
	283	else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
	284	gd->env_valid = 1;
	285	else if (tmp_env1->flags > tmp_env2->flags)
	286	gd->env_valid = 1;
	287	else if (tmp_env2->flags > tmp_env1->flags)
	288	gd->env_valid = 2;
	289	else /* flags are equal - almost impossible */
	290	gd->env_valid = 1;
	291	}
	292
	293	free(env_ptr);
	294
	295	if (gd->env_valid == 1)
	296	ep = tmp_env1;
	297	else
	298	ep = tmp_env2;
	299
	300	env_flags = ep->flags;
	301	env_import((char *)ep, 0);
	302	ret = 0;
	303
	304	fini:
	305	fini_mmc_for_env(mmc);
	306	err:
	307	if (ret)
c75648d7	308	set_default_env(errmsg);
d196bd88 MH	309	#endif
	310	}
	311	#else /* ! CONFIG_ENV_OFFSET_REDUND */
a8060359 TL	312	void env_relocate_spec(void)
	313	{
	314	#if !defined(ENV_IS_EMBEDDED)
cd0f4fa1	315	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
b9c8ccab	316	struct mmc *mmc;
97039ab9	317	u32 offset;
9404a5fc	318	int ret;
e92029c0	319	int dev = mmc_get_env_dev();
c75648d7	320	const char *errmsg;
b9c8ccab	321
b9c8ccab	322	mmc = find_mmc_device(dev);
a8060359	323
c75648d7 TH	324	errmsg = init_mmc_for_env(mmc);
c75648d7 TH	325	if (errmsg) {
9404a5fc SW	326	ret = 1;
	327	goto err;
	328	}
a8060359	329
d196bd88	330	if (mmc_get_env_addr(mmc, 0, &offset)) {
9404a5fc SW	331	ret = 1;
	332	goto fini;
	333	}
	334
cd0f4fa1	335	if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
c75648d7	336	errmsg = "!read failed";
9404a5fc SW	337	ret = 1;
	338	goto fini;
	339	}
a8060359	340
cd0f4fa1	341	env_import(buf, 1);
9404a5fc SW	342	ret = 0;
	343
	344	fini:
	345	fini_mmc_for_env(mmc);
	346	err:
	347	if (ret)
c75648d7	348	set_default_env(errmsg);
a8060359 TL	349	#endif
a8060359 TL	350	}
d196bd88	351	#endif /* CONFIG_ENV_OFFSET_REDUND */