common/env_flash.c - uboot/prism - Git at Google

 /*
  * (C) Copyright 2000-2002
  * 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>

 DECLARE_GLOBAL_DATA_PTR;

 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
 #define CMD_SAVEENV
 #elif defined(CONFIG_ENV_ADDR_REDUND)
 #error Cannot use CONFIG_ENV_ADDR_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
 #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

 #ifdef CONFIG_INFERNO
 # ifdef CONFIG_ENV_ADDR_REDUND
 #error CONFIG_ENV_ADDR_REDUND is not implemented for CONFIG_INFERNO
 # endif
 #endif

 char * env_name_spec = "Flash";

 #ifdef ENV_IS_EMBEDDED

 extern uchar environment[];
 env_t *env_ptr = (env_t *)(&environment[0]);

 #ifdef CMD_SAVEENV
 /* static env_t *flash_addr = (env_t *)(&environment[0]);-broken on ARM-wd-*/
 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
 #endif

 #else /* ! ENV_IS_EMBEDDED */

 env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
 #ifdef CMD_SAVEENV
 static env_t *flash_addr = (env_t *)CONFIG_ENV_ADDR;
 #endif

 #endif /* ENV_IS_EMBEDDED */

 #ifdef CONFIG_ENV_ADDR_REDUND
 static env_t *flash_addr_new = (env_t *)CONFIG_ENV_ADDR_REDUND;

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

 #define ACTIVE_FLAG   1
 #define OBSOLETE_FLAG 0
 #endif /* CONFIG_ENV_ADDR_REDUND */

 extern uchar default_environment[];


 uchar env_get_char_spec (int index)
 {
 	return ( *((uchar *)(gd->env_addr + index)) );
 }

 #ifdef CONFIG_ENV_ADDR_REDUND

 int  env_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 = 1;
 	} else if (! crc1_ok && crc2_ok) {
 		gd->env_addr  = addr2;
 		gd->env_valid = 1;
 	} else if (! crc1_ok && ! crc2_ok) {
 		gd->env_addr  = addr_default;
 		gd->env_valid = 0;
 	} else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
 		gd->env_addr  = addr1;
 		gd->env_valid = 1;
 	} else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
 		gd->env_addr  = addr2;
 		gd->env_valid = 1;
 	} else if (flag1 == flag2) {
 		gd->env_addr  = addr1;
 		gd->env_valid = 2;
 	} else if (flag1 == 0xFF) {
 		gd->env_addr  = addr1;
 		gd->env_valid = 2;
 	} else if (flag2 == 0xFF) {
 		gd->env_addr  = addr2;
 		gd->env_valid = 2;
 	}

 	return (0);
 }

 #ifdef CMD_SAVEENV
 int saveenv(void)
 {
 	char *saved_data = NULL;
 	int rc = 1;
 	char flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
 #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;
 	}

 #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%x\n", up_data);
 	if (up_data) {
 		if ((saved_data = malloc(up_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%x, len 0x%x) saved at 0x%x\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));
 	if ((rc = flash_write((char *)env_ptr->data,
 			(ulong)&(flash_addr_new->data),
 			sizeof(env_ptr->data))) ||
 	    (rc = flash_write((char *)&(env_ptr->crc),
 			(ulong)&(flash_addr_new->crc),
 			sizeof(env_ptr->crc))) ||
 	    (rc = flash_write(&flag,
 			(ulong)&(flash_addr->flags),
 			sizeof(flash_addr->flags))) ||
 	    (rc = flash_write(&new_flag,
 			(ulong)&(flash_addr_new->flags),
 			sizeof(flash_addr_new->flags))))
 	{
 		flash_perror (rc);
 		goto Done;
 	}
 	puts ("done\n");

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

 	if (saved_data)
 		free (saved_data);
 	/* try to re-protect */
 	(void) flash_sect_protect (1, (ulong)flash_addr, end_addr);
 	(void) flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);

 	return rc;
 }
 #endif /* CMD_SAVEENV */

 #else /* ! CONFIG_ENV_ADDR_REDUND */

 int  env_init(void)
 {
 	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 		gd->env_addr  = (ulong)&(env_ptr->data);
 		gd->env_valid = 1;
 #if 0
 #ifdef CONFIG_MARVELL
         mvMPPConfigToSPI();
         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
             gd->env_addr  = (ulong)&(env_ptr->data);
             gd->env_valid = 1;
         mvMPPConfigToDefault();
 #else
         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
             gd->env_addr  = (ulong)&(env_ptr->data);
             gd->env_valid = 1;
 #endif
 #endif
 		return(0);
 	}

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

 #ifdef CMD_SAVEENV

 int saveenv(void)
 {
 	int	len, rc;
 	ulong	end_addr;
 	ulong	flash_sect_addr;
 #if defined(CONFIG_ENV_SECT_SIZE) && (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE)
 	ulong	flash_offset;
 	uchar	env_buffer[CONFIG_ENV_SECT_SIZE];
 #else
 	uchar *env_buffer = (uchar *)env_ptr;
 #endif	/* CONFIG_ENV_SECT_SIZE */
 	int rcode = 0;

 #if defined(CONFIG_ENV_SECT_SIZE) && (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE)

 	flash_offset    = ((ulong)flash_addr) & (CONFIG_ENV_SECT_SIZE-1);
 	flash_sect_addr = ((ulong)flash_addr) & ~(CONFIG_ENV_SECT_SIZE-1);

 	debug ( "copy old content: "
 		"sect_addr: %08lX  env_addr: %08lX  offset: %08lX\n",
 		flash_sect_addr, (ulong)flash_addr, flash_offset);

 	/* copy old contents to temporary buffer */
 	memcpy (env_buffer, (void *)flash_sect_addr, CONFIG_ENV_SECT_SIZE);

 	/* copy current environment to temporary buffer */
 	memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
 		env_ptr,
 		CONFIG_ENV_SIZE);

 	len	 = CONFIG_ENV_SECT_SIZE;
 #else
 	flash_sect_addr = (ulong)flash_addr;
 	len	 = CONFIG_ENV_SIZE;
 #endif	/* CONFIG_ENV_SECT_SIZE */

 #ifndef CONFIG_INFERNO
 	end_addr = flash_sect_addr + len - 1;
 #else
 	/* this is the last sector, and the size is hardcoded here */
 	/* otherwise we will get stack problems on loading 128 KB environment */
 	end_addr = flash_sect_addr + 0x20000 - 1;
 #endif

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

 	if (flash_sect_protect (0, flash_sect_addr, end_addr))
 		return 1;

 	puts ("Erasing Flash...");
 	if (flash_sect_erase (flash_sect_addr, end_addr))
 		return 1;

 	puts ("Writing to Flash... ");
 	rc = flash_write((char *)env_buffer, flash_sect_addr, len);
 	if (rc != 0) {
 		flash_perror (rc);
 		rcode = 1;
 	} else {
 		puts ("done\n");
 	}

 	/* try to re-protect */
 	(void) flash_sect_protect (1, flash_sect_addr, end_addr);
 	return rcode;
 }

 #endif /* CMD_SAVEENV */

 #endif /* CONFIG_ENV_ADDR_REDUND */

 void env_relocate_spec (void)
 {
 #if !defined(ENV_IS_EMBEDDED) || defined(CONFIG_ENV_ADDR_REDUND)
 #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 = 2;
 		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 = 2;
 		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 == 2)
 		puts ("*** Warning - some problems detected "
 		      "reading environment; recovered successfully\n\n");
 #endif /* CONFIG_ENV_ADDR_REDUND */
 #ifdef CMD_SAVEENV
 	memcpy (env_ptr, (void*)flash_addr, CONFIG_ENV_SIZE);
 #endif
 #endif /* ! ENV_IS_EMBEDDED || CONFIG_ENV_ADDR_REDUND */
 }
	/*
	* (C) Copyright 2000-2002
	* 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>

	DECLARE_GLOBAL_DATA_PTR;

	#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_FLASH)
	#define CMD_SAVEENV
	#elif defined(CONFIG_ENV_ADDR_REDUND)
	#error Cannot use CONFIG_ENV_ADDR_REDUND without CONFIG_CMD_SAVEENV & CONFIG_CMD_FLASH
	#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

	#ifdef CONFIG_INFERNO
	# ifdef CONFIG_ENV_ADDR_REDUND
	#error CONFIG_ENV_ADDR_REDUND is not implemented for CONFIG_INFERNO
	# endif
	#endif

	char * env_name_spec = "Flash";

	#ifdef ENV_IS_EMBEDDED

	extern uchar environment[];
	env_t env_ptr = (env_t )(&environment[0]);

	#ifdef CMD_SAVEENV
	/* static env_t flash_addr = (env_t )(&environment[0]);-broken on ARM-wd-*/
	static env_t flash_addr = (env_t )CONFIG_ENV_ADDR;
	#endif

	#else /* ! ENV_IS_EMBEDDED */

	env_t env_ptr = (env_t )CONFIG_ENV_ADDR;
	#ifdef CMD_SAVEENV
	static env_t flash_addr = (env_t )CONFIG_ENV_ADDR;
	#endif

	#endif /* ENV_IS_EMBEDDED */

	#ifdef CONFIG_ENV_ADDR_REDUND
	static env_t flash_addr_new = (env_t )CONFIG_ENV_ADDR_REDUND;

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

	#define ACTIVE_FLAG 1
	#define OBSOLETE_FLAG 0
	#endif /* CONFIG_ENV_ADDR_REDUND */

	extern uchar default_environment[];


	uchar env_get_char_spec (int index)
	{
	return ( ((uchar )(gd->env_addr + index)) );
	}

	#ifdef CONFIG_ENV_ADDR_REDUND

	int env_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 = 1;
	} else if (! crc1_ok && crc2_ok) {
	gd->env_addr = addr2;
	gd->env_valid = 1;
	} else if (! crc1_ok && ! crc2_ok) {
	gd->env_addr = addr_default;
	gd->env_valid = 0;
	} else if (flag1 == ACTIVE_FLAG && flag2 == OBSOLETE_FLAG) {
	gd->env_addr = addr1;
	gd->env_valid = 1;
	} else if (flag1 == OBSOLETE_FLAG && flag2 == ACTIVE_FLAG) {
	gd->env_addr = addr2;
	gd->env_valid = 1;
	} else if (flag1 == flag2) {
	gd->env_addr = addr1;
	gd->env_valid = 2;
	} else if (flag1 == 0xFF) {
	gd->env_addr = addr1;
	gd->env_valid = 2;
	} else if (flag2 == 0xFF) {
	gd->env_addr = addr2;
	gd->env_valid = 2;
	}

	return (0);
	}

	#ifdef CMD_SAVEENV
	int saveenv(void)
	{
	char *saved_data = NULL;
	int rc = 1;
	char flag = OBSOLETE_FLAG, new_flag = ACTIVE_FLAG;
	#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;
	}

	#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%x\n", up_data);
	if (up_data) {
	if ((saved_data = malloc(up_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%x, len 0x%x) saved at 0x%x\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));
	if ((rc = flash_write((char *)env_ptr->data,
	(ulong)&(flash_addr_new->data),
	sizeof(env_ptr->data))) \|\|
	(rc = flash_write((char *)&(env_ptr->crc),
	(ulong)&(flash_addr_new->crc),
	sizeof(env_ptr->crc))) \|\|
	(rc = flash_write(&flag,
	(ulong)&(flash_addr->flags),
	sizeof(flash_addr->flags))) \|\|
	(rc = flash_write(&new_flag,
	(ulong)&(flash_addr_new->flags),
	sizeof(flash_addr_new->flags))))
	{
	flash_perror (rc);
	goto Done;
	}
	puts ("done\n");

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

	if (saved_data)
	free (saved_data);
	/* try to re-protect */
	(void) flash_sect_protect (1, (ulong)flash_addr, end_addr);
	(void) flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);

	return rc;
	}
	#endif /* CMD_SAVEENV */

	#else /* ! CONFIG_ENV_ADDR_REDUND */

	int env_init(void)
	{
	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
	gd->env_addr = (ulong)&(env_ptr->data);
	gd->env_valid = 1;
	#if 0
	#ifdef CONFIG_MARVELL
	mvMPPConfigToSPI();
	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
	gd->env_addr = (ulong)&(env_ptr->data);
	gd->env_valid = 1;
	mvMPPConfigToDefault();
	#else
	if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
	gd->env_addr = (ulong)&(env_ptr->data);
	gd->env_valid = 1;
	#endif
	#endif
	return(0);
	}

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

	#ifdef CMD_SAVEENV

	int saveenv(void)
	{
	int len, rc;
	ulong end_addr;
	ulong flash_sect_addr;
	#if defined(CONFIG_ENV_SECT_SIZE) && (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE)
	ulong flash_offset;
	uchar env_buffer[CONFIG_ENV_SECT_SIZE];
	#else
	uchar env_buffer = (uchar )env_ptr;
	#endif /* CONFIG_ENV_SECT_SIZE */
	int rcode = 0;

	#if defined(CONFIG_ENV_SECT_SIZE) && (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE)

	flash_offset = ((ulong)flash_addr) & (CONFIG_ENV_SECT_SIZE-1);
	flash_sect_addr = ((ulong)flash_addr) & ~(CONFIG_ENV_SECT_SIZE-1);

	debug ( "copy old content: "
	"sect_addr: %08lX env_addr: %08lX offset: %08lX\n",
	flash_sect_addr, (ulong)flash_addr, flash_offset);

	/* copy old contents to temporary buffer */
	memcpy (env_buffer, (void *)flash_sect_addr, CONFIG_ENV_SECT_SIZE);

	/* copy current environment to temporary buffer */
	memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
	env_ptr,
	CONFIG_ENV_SIZE);

	len = CONFIG_ENV_SECT_SIZE;
	#else
	flash_sect_addr = (ulong)flash_addr;
	len = CONFIG_ENV_SIZE;
	#endif /* CONFIG_ENV_SECT_SIZE */

	#ifndef CONFIG_INFERNO
	end_addr = flash_sect_addr + len - 1;
	#else
	/* this is the last sector, and the size is hardcoded here */
	/* otherwise we will get stack problems on loading 128 KB environment */
	end_addr = flash_sect_addr + 0x20000 - 1;
	#endif

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

	if (flash_sect_protect (0, flash_sect_addr, end_addr))
	return 1;

	puts ("Erasing Flash...");
	if (flash_sect_erase (flash_sect_addr, end_addr))
	return 1;

	puts ("Writing to Flash... ");
	rc = flash_write((char *)env_buffer, flash_sect_addr, len);
	if (rc != 0) {
	flash_perror (rc);
	rcode = 1;
	} else {
	puts ("done\n");
	}

	/* try to re-protect */
	(void) flash_sect_protect (1, flash_sect_addr, end_addr);
	return rcode;
	}

	#endif /* CMD_SAVEENV */

	#endif /* CONFIG_ENV_ADDR_REDUND */

	void env_relocate_spec (void)
	{
	#if !defined(ENV_IS_EMBEDDED) \|\| defined(CONFIG_ENV_ADDR_REDUND)
	#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 = 2;
	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 = 2;
	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 == 2)
	puts ("*** Warning - some problems detected "
	"reading environment; recovered successfully\n\n");
	#endif /* CONFIG_ENV_ADDR_REDUND */
	#ifdef CMD_SAVEENV
	memcpy (env_ptr, (void*)flash_addr, CONFIG_ENV_SIZE);
	#endif
	#endif /* ! ENV_IS_EMBEDDED \|\| CONFIG_ENV_ADDR_REDUND */
	}