env/flash.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2000-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Andreas Heppel <aheppel@sysgo.de>
  */

 /* #define DEBUG */

 #include <common.h>
 #include <command.h>
 #include <env.h>
 #include <environment.h>
 #include <linux/stddef.h>
 #include <malloc.h>
 #include <search.h>
 #include <errno.h>

 DECLARE_GLOBAL_DATA_PTR;

 #ifndef CONFIG_SPL_BUILD
 # if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
 #  define CMD_SAVEENV
 # elif defined(CONFIG_ENV_ADDR_REDUND)
 #  error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
 # endif
 #endif

 #if defined(CONFIG_ENV_SIZE_REDUND) &&	\
 	(CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
 #error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
 #endif

 /* TODO(sjg@chromium.org): Figure out all these special cases */
 #if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
 	!defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
 	!defined(CONFIG_TARGET_EDMINIV2)) || \
 	!defined(CONFIG_SPL_BUILD)
 #define LOADENV
 #endif

 #if !defined(CONFIG_TARGET_X600) || !defined(CONFIG_SPL_BUILD)
 #define INITENV
 #endif

 #if defined(CONFIG_ENV_ADDR_REDUND) && defined(CMD_SAVEENV) || \
 	!defined(CONFIG_ENV_ADDR_REDUND) && defined(INITENV)
 #ifdef ENV_IS_EMBEDDED
 static env_t *env_ptr = &embedded_environment;
 #else /* ! ENV_IS_EMBEDDED */

 static env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
 #endif /* ENV_IS_EMBEDDED */
 #endif
 static __maybe_unused env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;

 /* CONFIG_ENV_ADDR is supposed to be on sector boundary */
 static ulong __maybe_unused end_addr =
 		CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;

 #ifdef CONFIG_ENV_ADDR_REDUND

 static env_t __maybe_unused *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;

 /* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
 static ulong __maybe_unused end_addr_new =
 		CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
 #endif /* CONFIG_ENV_ADDR_REDUND */

 #ifdef CONFIG_ENV_ADDR_REDUND
 #ifdef INITENV
 static int env_flash_init(void)
 {
 	int crc1_ok = 0, crc2_ok = 0;

 	uchar flag1 = flash_addr->flags;
 	uchar flag2 = flash_addr_new->flags;

 	ulong addr_default = (ulong)&default_environment[0];
 	ulong addr1 = (ulong)&(flash_addr->data);
 	ulong addr2 = (ulong)&(flash_addr_new->data);

 	crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
 	crc2_ok =
 		crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;

 	if (crc1_ok && !crc2_ok) {
 		gd->env_addr	= addr1;
 		gd->env_valid	= ENV_VALID;
 	} else if (!crc1_ok && crc2_ok) {
 		gd->env_addr	= addr2;
 		gd->env_valid	= ENV_VALID;
 	} else if (!crc1_ok && !crc2_ok) {
 		gd->env_addr	= addr_default;
 		gd->env_valid	= ENV_INVALID;
 	} else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
 		gd->env_addr	= addr1;
 		gd->env_valid	= ENV_VALID;
 	} else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 		gd->env_addr	= addr2;
 		gd->env_valid	= ENV_VALID;
 	} else if (flag1 == flag2) {
 		gd->env_addr	= addr1;
 		gd->env_valid	= ENV_REDUND;
 	} else if (flag1 == 0xFF) {
 		gd->env_addr	= addr1;
 		gd->env_valid	= ENV_REDUND;
 	} else if (flag2 == 0xFF) {
 		gd->env_addr	= addr2;
 		gd->env_valid	= ENV_REDUND;
 	}

 	return 0;
 }
 #endif

 #ifdef CMD_SAVEENV
 static int env_flash_save(void)
 {
 	env_t	env_new;
 	char	*saved_data = NULL;
 	char	flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 	int	rc = 1;
 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 	ulong	up_data = 0;
 #endif

 	debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);

 	if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
 		goto done;

 	debug("Protect off %08lX ... %08lX\n",
 		(ulong)flash_addr_new, end_addr_new);

 	if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
 		goto done;

 	rc = env_export(&env_new);
 	if (rc)
 		return rc;
 	env_new.flags	= new_flag;

 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 	up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
 	debug("Data to save 0x%lX\n", up_data);
 	if (up_data) {
 		saved_data = malloc(up_data);
 		if (saved_data == NULL) {
 			printf("Unable to save the rest of sector (%ld)\n",
 				up_data);
 			goto done;
 		}
 		memcpy(saved_data,
 			(void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
 			up_data);
 		debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
 			(long)flash_addr_new + CONFIG_ENV_SIZE,
 			up_data, saved_data);
 	}
 #endif
 	puts("Erasing Flash...");
 	debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);

 	if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
 		goto done;

 	puts("Writing to Flash... ");
 	debug(" %08lX ... %08lX ...",
 		(ulong)&(flash_addr_new->data),
 		sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
 	rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
 			 sizeof(env_new));
 	if (rc)
 		goto perror;

 	rc = flash_write(&flag, (ulong)&(flash_addr->flags),
 			 sizeof(flash_addr->flags));
 	if (rc)
 		goto perror;

 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 	if (up_data) { /* restore the rest of sector */
 		debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
 			(long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
 		if (flash_write(saved_data,
 				(long)flash_addr_new + CONFIG_ENV_SIZE,
 				up_data))
 			goto perror;
 	}
 #endif
 	puts("done\n");

 	{
 		env_t *etmp = flash_addr;
 		ulong ltmp = end_addr;

 		flash_addr = flash_addr_new;
 		flash_addr_new = etmp;

 		end_addr = end_addr_new;
 		end_addr_new = ltmp;
 	}

 	rc = 0;
 	goto done;
 perror:
 	flash_perror(rc);
 done:
 	if (saved_data)
 		free(saved_data);
 	/* try to re-protect */
 	flash_sect_protect(1, (ulong)flash_addr, end_addr);
 	flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);

 	return rc;
 }
 #endif /* CMD_SAVEENV */

 #else /* ! CONFIG_ENV_ADDR_REDUND */

 #ifdef INITENV
 static int env_flash_init(void)
 {
 	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 		gd->env_addr	= (ulong)&(env_ptr->data);
 		gd->env_valid	= ENV_VALID;
 		return 0;
 	}

 	gd->env_addr	= (ulong)&default_environment[0];
 	gd->env_valid	= ENV_INVALID;
 	return 0;
 }
 #endif

 #ifdef CMD_SAVEENV
 static int env_flash_save(void)
 {
 	env_t	env_new;
 	int	rc = 1;
 	char	*saved_data = NULL;
 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 	ulong	up_data = 0;

 	up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
 	debug("Data to save 0x%lx\n", up_data);
 	if (up_data) {
 		saved_data = malloc(up_data);
 		if (saved_data == NULL) {
 			printf("Unable to save the rest of sector (%ld)\n",
 				up_data);
 			goto done;
 		}
 		memcpy(saved_data,
 			(void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
 		debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
 			(ulong)flash_addr + CONFIG_ENV_SIZE,
 			up_data,
 			(ulong)saved_data);
 	}
 #endif	/* CONFIG_ENV_SECT_SIZE */

 	debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);

 	if (flash_sect_protect(0, (long)flash_addr, end_addr))
 		goto done;

 	rc = env_export(&env_new);
 	if (rc)
 		goto done;

 	puts("Erasing Flash...");
 	if (flash_sect_erase((long)flash_addr, end_addr))
 		goto done;

 	puts("Writing to Flash... ");
 	rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
 	if (rc != 0)
 		goto perror;

 #if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
 	if (up_data) {	/* restore the rest of sector */
 		debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
 			(ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
 		if (flash_write(saved_data,
 				(long)flash_addr + CONFIG_ENV_SIZE,
 				up_data))
 			goto perror;
 	}
 #endif
 	puts("done\n");
 	rc = 0;
 	goto done;
 perror:
 	flash_perror(rc);
 done:
 	if (saved_data)
 		free(saved_data);
 	/* try to re-protect */
 	flash_sect_protect(1, (long)flash_addr, end_addr);
 	return rc;
 }
 #endif /* CMD_SAVEENV */

 #endif /* CONFIG_ENV_ADDR_REDUND */

 #ifdef LOADENV
 static int env_flash_load(void)
 {
 #ifdef CONFIG_ENV_ADDR_REDUND
 	if (gd->env_addr != (ulong)&(flash_addr->data)) {
 		env_t *etmp = flash_addr;
 		ulong ltmp = end_addr;

 		flash_addr = flash_addr_new;
 		flash_addr_new = etmp;

 		end_addr = end_addr_new;
 		end_addr_new = ltmp;
 	}

 	if (flash_addr_new->flags != OBSOLETE_FLAG &&
 	    crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
 		char flag = OBSOLETE_FLAG;

 		gd->env_valid = ENV_REDUND;
 		flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
 		flash_write(&flag,
 			    (ulong)&(flash_addr_new->flags),
 			    sizeof(flash_addr_new->flags));
 		flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
 	}

 	if (flash_addr->flags != ACTIVE_FLAG &&
 	    (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
 		char flag = ACTIVE_FLAG;

 		gd->env_valid = ENV_REDUND;
 		flash_sect_protect(0, (ulong)flash_addr, end_addr);
 		flash_write(&flag,
 			    (ulong)&(flash_addr->flags),
 			    sizeof(flash_addr->flags));
 		flash_sect_protect(1, (ulong)flash_addr, end_addr);
 	}

 	if (gd->env_valid == ENV_REDUND)
 		puts("*** Warning - some problems detected "
 		     "reading environment; recovered successfully\n\n");
 #endif /* CONFIG_ENV_ADDR_REDUND */

 	return env_import((char *)flash_addr, 1);
 }
 #endif /* LOADENV */

 U_BOOT_ENV_LOCATION(flash) = {
 	.location	= ENVL_FLASH,
 	ENV_NAME("Flash")
 #ifdef LOADENV
 	.load		= env_flash_load,
 #endif
 #ifdef CMD_SAVEENV
 	.save		= env_save_ptr(env_flash_save),
 #endif
 #ifdef INITENV
 	.init		= env_flash_init,
 #endif
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2000-2010
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Andreas Heppel <aheppel@sysgo.de>
	*/

	/* #define DEBUG */

	#include <common.h>
	#include <command.h>
	#include <env.h>
	#include <environment.h>
	#include <linux/stddef.h>
	#include <malloc.h>
	#include <search.h>
	#include <errno.h>

	DECLARE_GLOBAL_DATA_PTR;

	#ifndef CONFIG_SPL_BUILD
	# if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
	# define CMD_SAVEENV
	# elif defined(CONFIG_ENV_ADDR_REDUND)
	# error CONFIG_ENV_ADDR_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
	# endif
	#endif

	#if defined(CONFIG_ENV_SIZE_REDUND) && \
	(CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE)
	#error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE
	#endif

	/* TODO(sjg@chromium.org): Figure out all these special cases */
	#if (!defined(CONFIG_MICROBLAZE) && !defined(CONFIG_ARCH_ZYNQ) && \
	!defined(CONFIG_TARGET_MCCMON6) && !defined(CONFIG_TARGET_X600) && \
	!defined(CONFIG_TARGET_EDMINIV2)) \|\| \
	!defined(CONFIG_SPL_BUILD)
	#define LOADENV
	#endif

	#if !defined(CONFIG_TARGET_X600) \|\| !defined(CONFIG_SPL_BUILD)
	#define INITENV
	#endif

	#if defined(CONFIG_ENV_ADDR_REDUND) && defined(CMD_SAVEENV) \|\| \
	!defined(CONFIG_ENV_ADDR_REDUND) && defined(INITENV)
	#ifdef ENV_IS_EMBEDDED
	static env_t *env_ptr = &embedded_environment;
	#else /* ! ENV_IS_EMBEDDED */

	static env_t env_ptr = (env_t )CONFIG_ENV_ADDR;
	#endif /* ENV_IS_EMBEDDED */
	#endif
	static __maybe_unused env_t flash_addr = (env_t )CONFIG_ENV_ADDR;

	/* CONFIG_ENV_ADDR is supposed to be on sector boundary */
	static ulong __maybe_unused end_addr =
	CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1;

	#ifdef CONFIG_ENV_ADDR_REDUND

	static env_t __maybe_unused flash_addr_new = (env_t )CONFIG_ENV_ADDR_REDUND;

	/* CONFIG_ENV_ADDR_REDUND is supposed to be on sector boundary */
	static ulong __maybe_unused end_addr_new =
	CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
	#endif /* CONFIG_ENV_ADDR_REDUND */

	#ifdef CONFIG_ENV_ADDR_REDUND
	#ifdef INITENV
	static int env_flash_init(void)
	{
	int crc1_ok = 0, crc2_ok = 0;

	uchar flag1 = flash_addr->flags;
	uchar flag2 = flash_addr_new->flags;

	ulong addr_default = (ulong)&default_environment[0];
	ulong addr1 = (ulong)&(flash_addr->data);
	ulong addr2 = (ulong)&(flash_addr_new->data);

	crc1_ok = crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc;
	crc2_ok =
	crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc;

	if (crc1_ok && !crc2_ok) {
	gd->env_addr = addr1;
	gd->env_valid = ENV_VALID;
	} else if (!crc1_ok && crc2_ok) {
	gd->env_addr = addr2;
	gd->env_valid = ENV_VALID;
	} else if (!crc1_ok && !crc2_ok) {
	gd->env_addr = addr_default;
	gd->env_valid = ENV_INVALID;
	} else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
	gd->env_addr = addr1;
	gd->env_valid = ENV_VALID;
	} else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
	gd->env_addr = addr2;
	gd->env_valid = ENV_VALID;
	} else if (flag1 == flag2) {
	gd->env_addr = addr1;
	gd->env_valid = ENV_REDUND;
	} else if (flag1 == 0xFF) {
	gd->env_addr = addr1;
	gd->env_valid = ENV_REDUND;
	} else if (flag2 == 0xFF) {
	gd->env_addr = addr2;
	gd->env_valid = ENV_REDUND;
	}

	return 0;
	}
	#endif

	#ifdef CMD_SAVEENV
	static int env_flash_save(void)
	{
	env_t env_new;
	char *saved_data = NULL;
	char flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
	int rc = 1;
	#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
	ulong up_data = 0;
	#endif

	debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);

	if (flash_sect_protect(0, (ulong)flash_addr, end_addr))
	goto done;

	debug("Protect off %08lX ... %08lX\n",
	(ulong)flash_addr_new, end_addr_new);

	if (flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new))
	goto done;

	rc = env_export(&env_new);
	if (rc)
	return rc;
	env_new.flags = new_flag;

	#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
	up_data = end_addr_new + 1 - ((long)flash_addr_new + CONFIG_ENV_SIZE);
	debug("Data to save 0x%lX\n", up_data);
	if (up_data) {
	saved_data = malloc(up_data);
	if (saved_data == NULL) {
	printf("Unable to save the rest of sector (%ld)\n",
	up_data);
	goto done;
	}
	memcpy(saved_data,
	(void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
	up_data);
	debug("Data (start 0x%lX, len 0x%lX) saved at 0x%p\n",
	(long)flash_addr_new + CONFIG_ENV_SIZE,
	up_data, saved_data);
	}
	#endif
	puts("Erasing Flash...");
	debug(" %08lX ... %08lX ...", (ulong)flash_addr_new, end_addr_new);

	if (flash_sect_erase((ulong)flash_addr_new, end_addr_new))
	goto done;

	puts("Writing to Flash... ");
	debug(" %08lX ... %08lX ...",
	(ulong)&(flash_addr_new->data),
	sizeof(env_ptr->data) + (ulong)&(flash_addr_new->data));
	rc = flash_write((char *)&env_new, (ulong)flash_addr_new,
	sizeof(env_new));
	if (rc)
	goto perror;

	rc = flash_write(&flag, (ulong)&(flash_addr->flags),
	sizeof(flash_addr->flags));
	if (rc)
	goto perror;

	#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
	if (up_data) { /* restore the rest of sector */
	debug("Restoring the rest of data to 0x%lX len 0x%lX\n",
	(long)flash_addr_new + CONFIG_ENV_SIZE, up_data);
	if (flash_write(saved_data,
	(long)flash_addr_new + CONFIG_ENV_SIZE,
	up_data))
	goto perror;
	}
	#endif
	puts("done\n");

	{
	env_t *etmp = flash_addr;
	ulong ltmp = end_addr;

	flash_addr = flash_addr_new;
	flash_addr_new = etmp;

	end_addr = end_addr_new;
	end_addr_new = ltmp;
	}

	rc = 0;
	goto done;
	perror:
	flash_perror(rc);
	done:
	if (saved_data)
	free(saved_data);
	/* try to re-protect */
	flash_sect_protect(1, (ulong)flash_addr, end_addr);
	flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);

	return rc;
	}
	#endif /* CMD_SAVEENV */

	#else /* ! CONFIG_ENV_ADDR_REDUND */

	#ifdef INITENV
	static int env_flash_init(void)
	{
	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
	gd->env_addr = (ulong)&(env_ptr->data);
	gd->env_valid = ENV_VALID;
	return 0;
	}

	gd->env_addr = (ulong)&default_environment[0];
	gd->env_valid = ENV_INVALID;
	return 0;
	}
	#endif

	#ifdef CMD_SAVEENV
	static int env_flash_save(void)
	{
	env_t env_new;
	int rc = 1;
	char *saved_data = NULL;
	#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
	ulong up_data = 0;

	up_data = end_addr + 1 - ((long)flash_addr + CONFIG_ENV_SIZE);
	debug("Data to save 0x%lx\n", up_data);
	if (up_data) {
	saved_data = malloc(up_data);
	if (saved_data == NULL) {
	printf("Unable to save the rest of sector (%ld)\n",
	up_data);
	goto done;
	}
	memcpy(saved_data,
	(void *)((long)flash_addr + CONFIG_ENV_SIZE), up_data);
	debug("Data (start 0x%lx, len 0x%lx) saved at 0x%lx\n",
	(ulong)flash_addr + CONFIG_ENV_SIZE,
	up_data,
	(ulong)saved_data);
	}
	#endif /* CONFIG_ENV_SECT_SIZE */

	debug("Protect off %08lX ... %08lX\n", (ulong)flash_addr, end_addr);

	if (flash_sect_protect(0, (long)flash_addr, end_addr))
	goto done;

	rc = env_export(&env_new);
	if (rc)
	goto done;

	puts("Erasing Flash...");
	if (flash_sect_erase((long)flash_addr, end_addr))
	goto done;

	puts("Writing to Flash... ");
	rc = flash_write((char *)&env_new, (long)flash_addr, CONFIG_ENV_SIZE);
	if (rc != 0)
	goto perror;

	#if CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE
	if (up_data) { /* restore the rest of sector */
	debug("Restoring the rest of data to 0x%lx len 0x%lx\n",
	(ulong)flash_addr + CONFIG_ENV_SIZE, up_data);
	if (flash_write(saved_data,
	(long)flash_addr + CONFIG_ENV_SIZE,
	up_data))
	goto perror;
	}
	#endif
	puts("done\n");
	rc = 0;
	goto done;
	perror:
	flash_perror(rc);
	done:
	if (saved_data)
	free(saved_data);
	/* try to re-protect */
	flash_sect_protect(1, (long)flash_addr, end_addr);
	return rc;
	}
	#endif /* CMD_SAVEENV */

	#endif /* CONFIG_ENV_ADDR_REDUND */

	#ifdef LOADENV
	static int env_flash_load(void)
	{
	#ifdef CONFIG_ENV_ADDR_REDUND
	if (gd->env_addr != (ulong)&(flash_addr->data)) {
	env_t *etmp = flash_addr;
	ulong ltmp = end_addr;

	flash_addr = flash_addr_new;
	flash_addr_new = etmp;

	end_addr = end_addr_new;
	end_addr_new = ltmp;
	}

	if (flash_addr_new->flags != OBSOLETE_FLAG &&
	crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc) {
	char flag = OBSOLETE_FLAG;

	gd->env_valid = ENV_REDUND;
	flash_sect_protect(0, (ulong)flash_addr_new, end_addr_new);
	flash_write(&flag,
	(ulong)&(flash_addr_new->flags),
	sizeof(flash_addr_new->flags));
	flash_sect_protect(1, (ulong)flash_addr_new, end_addr_new);
	}

	if (flash_addr->flags != ACTIVE_FLAG &&
	(flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
	char flag = ACTIVE_FLAG;

	gd->env_valid = ENV_REDUND;
	flash_sect_protect(0, (ulong)flash_addr, end_addr);
	flash_write(&flag,
	(ulong)&(flash_addr->flags),
	sizeof(flash_addr->flags));
	flash_sect_protect(1, (ulong)flash_addr, end_addr);
	}

	if (gd->env_valid == ENV_REDUND)
	puts("*** Warning - some problems detected "
	"reading environment; recovered successfully\n\n");
	#endif /* CONFIG_ENV_ADDR_REDUND */

	return env_import((char *)flash_addr, 1);
	}
	#endif /* LOADENV */

	U_BOOT_ENV_LOCATION(flash) = {
	.location = ENVL_FLASH,
	ENV_NAME("Flash")
	#ifdef LOADENV
	.load = env_flash_load,
	#endif
	#ifdef CMD_SAVEENV
	.save = env_save_ptr(env_flash_save),
	#endif
	#ifdef INITENV
	.init = env_flash_init,
	#endif
	};