* Restrict baudrate settings on LWMON to higher speedsLABEL_2003_01_11_1050

  when watchdog is on

* Update baudrate in bd_info when it gets changed

* Add watchdog trigger points while waiting for serial port
  (so far only 8xx -- needed on LWMON with 100ms watchdog)

* Improve command line tool to access the U-Boot's environment
  (figuration of the utility, using a config file)

13 files changed, 341 insertions, 171 deletions

diff --git a/CHANGELOG b/CHANGELOG
index e16565423e1..309bbf9ea7c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,14 @@
 Changes since U-Boot 0.2.0:
 ======================================================================
 
+* Update baudrate in bd_info when it gets changed
+
+* Add watchdog trigger points while waiting for serial port
+  (so far only 8xx -- needed on LWMON with 100ms watchdog)
+
+* Improve command line tool to access the U-Boot's environment
+  (figuration of the utility, using a config file)
+
 * Add single quote support for (old) command line parser
 
 * Switch LWMON board default config from FRAM to EEPROM;
diff --git a/board/lwmon/lwmon.c b/board/lwmon/lwmon.c
index e797b362814..f255599cf4f 100644
--- a/board/lwmon/lwmon.c
+++ b/board/lwmon/lwmon.c
@@ -833,7 +833,7 @@ int do_kbd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 }
 
 /* Read and set LSB switch */
-#define CFG_PC_TXD1_ENA		0x0008
+#define CFG_PC_TXD1_ENA		0x0008		/* PC.12 */
 
 /***********************************************************************
 F* Function:     int do_lsb (cmd_tbl_t *cmdtp, int flag,
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 9b6d14fe235..c404157acc6 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -232,6 +232,10 @@ int _do_setenv (int flag, int argc, char *argv[])
 				baudrate);
 			udelay(50000);
 			gd->baudrate = baudrate;
+#ifdef CONFIG_PPC
+			gd->bd->bi_baudrate = baudrate;
+#endif
+
 			serial_setbrg ();
 			udelay(50000);
 			for (;;) {
diff --git a/common/cmd_pcmcia.c b/common/cmd_pcmcia.c
index 8a3491ede79..f9bd0ba89b6 100644
--- a/common/cmd_pcmcia.c
+++ b/common/cmd_pcmcia.c
@@ -282,7 +282,7 @@ static int check_ide_device (int slot)
 
 	addr = (volatile uchar *)(CFG_PCMCIA_MEM_ADDR +
 				  CFG_PCMCIA_MEM_SIZE * (slot * 4));
-	debug ("PCMCIA MEM: %08X\n", addr);
+	debug ("PCMCIA MEM: %08lX\n", (ulong)addr);
 
 	start = p = (volatile uchar *) addr;
 
diff --git a/common/environment.c b/common/environment.c
index 74bfd6269d3..1df38729031 100644
--- a/common/environment.c
+++ b/common/environment.c
@@ -167,7 +167,7 @@ env_t environment __PPCENV__ = {
 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 	CONFIG_EXTRA_ENV_SETTINGS
 #endif
-	"\0"		/* Term. env_t.data with 2 NULLs */
+	"\0"		/* Term. env_t.data with 2 NULs */
 	}
 };
 #ifdef CFG_ENV_ADDR_REDUND
diff --git a/common/hush.c b/common/hush.c
index 925474332be..fcc3559235c 100644
--- a/common/hush.c
+++ b/common/hush.c
@@ -117,14 +117,15 @@
 /* #include <dmalloc.h> */
 /* #define DEBUG_SHELL */
 
-#ifdef BB_VER
+#if 1
 #include "busybox.h"
 #include "cmdedit.h"
 #else
 #define applet_name "hush"
 #include "standalone.h"
 #define hush_main main
-#undef BB_FEATURE_SH_FANCY_PROMPT
+#undef CONFIG_FEATURE_SH_FANCY_PROMPT
+#define BB_BANNER
 #endif
 #endif
 #define SPECIAL_VAR_SYMBOL 03
@@ -430,7 +431,7 @@ static void setup_string_in_str(struct in_str *i, const char *s);
 /*  close_me manipulations: */
 static void mark_open(int fd);
 static void mark_closed(int fd);
-static void close_all();
+static void close_all(void);
 #endif
 /*  "run" the final data structures: */
 static char *indenter(int i);
@@ -902,7 +903,7 @@ static void b_reset(o_string *o)
 static void b_free(o_string *o)
 {
 	b_reset(o);
-	if (o->data != NULL) free(o->data);
+	free(o->data);
 	o->data = NULL;
 	o->maxlen = 0;
 }
@@ -958,7 +959,7 @@ static int static_peek(struct in_str *i)
 #ifndef __U_BOOT__
 static inline void cmdedit_set_initial_prompt(void)
 {
-#ifndef BB_FEATURE_SH_FANCY_PROMPT
+#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
 	PS1 = NULL;
 #else
 	PS1 = getenv("PS1");
@@ -970,11 +971,10 @@ static inline void cmdedit_set_initial_prompt(void)
 static inline void setup_prompt_string(int promptmode, char **prompt_str)
 {
 	debug_printf("setup_prompt_string %d ",promptmode);
-#ifndef BB_FEATURE_SH_FANCY_PROMPT
+#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
 	/* Set up the prompt */
 	if (promptmode == 1) {
-		if (PS1)
-			free(PS1);
+		free(PS1);
 		PS1=xmalloc(strlen(cwd)+4);
 		sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ?  "$ ":"# ");
 		*prompt_str = PS1;
@@ -995,7 +995,7 @@ static void get_user_input(struct in_str *i)
 	static char the_command[BUFSIZ];
 
 	setup_prompt_string(i->promptmode, &prompt_str);
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 	/*
 	 ** enable command line editing only while a command line
 	 ** is actually being read; otherwise, we'll end up bequeathing
@@ -1176,7 +1176,7 @@ static void mark_closed(int fd)
 	free(tmp);
 }
 
-static void close_all()
+static void close_all(void)
 {
 	struct close_me *c;
 	for (c=close_me_head; c; c=c->next) {
@@ -1290,18 +1290,18 @@ static void pseudo_exec(struct child_prog *child)
 		 * really dislike relying on /proc for things.  We could exec ourself
 		 * from global_argv[0], but if we are in a chroot, we may not be able
 		 * to find ourself... */
-#ifdef BB_FEATURE_SH_STANDALONE_SHELL
+#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
 		{
 			int argc_l;
 			char** argv_l=child->argv;
 			char *name = child->argv[0];
 
-#ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN
+#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
 			/* Following discussions from November 2000 on the busybox mailing
 			 * list, the default configuration, (without
 			 * get_last_path_component()) lets the user force use of an
 			 * external command by specifying the full (with slashes) filename.
-			 * If you enable BB_FEATURE_SH_APPLETS_ALWAYS_WIN, then applets
+			 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
 			 * _aways_ override external commands, so if you want to run
 			 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
 			 * filesystem and is _not_ busybox.  Some systems may want this,
@@ -1524,13 +1524,26 @@ static int run_pipe_real(struct pipe *pi)
 	struct child_prog *child;
 	struct built_in_command *x;
 	char *p;
+# if __GNUC__
+	/* Avoid longjmp clobbering */
+	(void) &i;
+	(void) &nextin;
+	(void) &nextout;
+	(void) &child;
+# endif
 #else
 	int nextin;
 	int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
 	struct child_prog *child;
 	cmd_tbl_t *cmdtp;
 	char *p;
-#endif
+# if __GNUC__
+	/* Avoid longjmp clobbering */
+	(void) &i;
+	(void) &nextin;
+	(void) &child;
+# endif
+#endif	/* __U_BOOT__ */
 
 	nextin = 0;
 #ifndef __U_BOOT__
@@ -3194,7 +3207,7 @@ static void *xrealloc(void *ptr, size_t size)
 /* Make sure we have a controlling tty.  If we get started under a job
  * aware app (like bash for example), make sure we are now in charge so
  * we don't fight over who gets the foreground */
-static void setup_job_control()
+static void setup_job_control(void)
 {
 	static pid_t shell_pgrp;
 	/* Loop until we are in the foreground.  */
@@ -3243,7 +3256,7 @@ int hush_main(int argc, char **argv)
 
 	/* Initialize some more globals to non-zero values */
 	set_cwd();
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 	cmdedit_set_initial_prompt();
 #else
 	PS1 = NULL;
@@ -3312,7 +3325,10 @@ int hush_main(int argc, char **argv)
 	debug_printf("\ninteractive=%d\n", interactive);
 	if (interactive) {
 		/* Looks like they want an interactive shell */
-		fprintf(stdout, "\nhush -- the humble shell v0.01 (testing)\n\n");
+#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 
+		printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
+		printf( "Enter 'help' for a list of built-in commands.\n\n");
+#endif
 		setup_job_control();
 	}
 
@@ -3327,7 +3343,7 @@ int hush_main(int argc, char **argv)
 	input = xfopen(argv[optind], "r");
 	opt = parse_file_outer(input);
 
-#ifdef BB_FEATURE_CLEAN_UP
+#ifdef CONFIG_FEATURE_CLEAN_UP
 	fclose(input);
 	if (cwd && cwd != unknown)
 		free((char*)cwd);
diff --git a/cpu/mpc8xx/serial.c b/cpu/mpc8xx/serial.c
index 0690300b24e..2871084fcdd 100644
--- a/cpu/mpc8xx/serial.c
+++ b/cpu/mpc8xx/serial.c
@@ -24,6 +24,7 @@
 #include <common.h>
 #include <commproc.h>
 #include <command.h>
+#include <watchdog.h>
 
 #if !defined(CONFIG_8xx_CONS_NONE)	/* No Console at all */
 
@@ -265,20 +266,16 @@ serial_putc(const char c)
 	*/
 
 	buf = (char *)tbdf->cbd_bufaddr;
-#if 0
-	__asm__("eieio");
-	while (tbdf->cbd_sc & BD_SC_READY)
-		__asm__("eieio");
-#endif
 
 	*buf = c;
 	tbdf->cbd_datlen = 1;
 	tbdf->cbd_sc |= BD_SC_READY;
 	__asm__("eieio");
-#if 1
-	while (tbdf->cbd_sc & BD_SC_READY)
+
+	while (tbdf->cbd_sc & BD_SC_READY) {
+		WATCHDOG_RESET ();
 		__asm__("eieio");
-#endif
+	}
 }
 
 int
@@ -298,8 +295,10 @@ serial_getc(void)
 	/* Wait for character to show up.
 	*/
 	buf = (unsigned char *)rbdf->cbd_bufaddr;
+
 	while (rbdf->cbd_sc & BD_SC_EMPTY)
-		;
+		WATCHDOG_RESET ();
+
 	c = *buf;
 	rbdf->cbd_sc |= BD_SC_EMPTY;
 
@@ -524,20 +523,16 @@ serial_putc(const char c)
 	*/
 
 	buf = (char *)tbdf->cbd_bufaddr;
-#if 0
-	__asm__("eieio");
-	while (tbdf->cbd_sc & BD_SC_READY)
-		__asm__("eieio");
-#endif
 
 	*buf = c;
 	tbdf->cbd_datlen = 1;
 	tbdf->cbd_sc |= BD_SC_READY;
 	__asm__("eieio");
-#if 1
-	while (tbdf->cbd_sc & BD_SC_READY)
+
+	while (tbdf->cbd_sc & BD_SC_READY) {
 		__asm__("eieio");
-#endif
+		WATCHDOG_RESET ();
+	}
 }
 
 int
@@ -557,8 +552,10 @@ serial_getc(void)
 	/* Wait for character to show up.
 	*/
 	buf = (unsigned char *)rbdf->cbd_bufaddr;
+
 	while (rbdf->cbd_sc & BD_SC_EMPTY)
-		;
+		WATCHDOG_RESET ();
+
 	c = *buf;
 	rbdf->cbd_sc |= BD_SC_EMPTY;
 
diff --git a/cpu/mpc8xx/start.S b/cpu/mpc8xx/start.S
index a1b7effe8f6..213c9a9bedd 100644
--- a/cpu/mpc8xx/start.S
+++ b/cpu/mpc8xx/start.S
@@ -583,7 +583,7 @@ relocate_code:
 
 	/* First our own GOT */
 	add	r14, r14, r15
-	/* the the one used by the C code */
+	/* then the one used by the C code */
 	add	r30, r30, r15
 
 	/*
diff --git a/include/configs/lwmon.h b/include/configs/lwmon.h
index dc0099de4cc..66c79356f4a 100644
--- a/include/configs/lwmon.h
+++ b/include/configs/lwmon.h
@@ -203,7 +203,14 @@
 
 #define CFG_HZ			1000	/* decrementer freq: 1 ms ticks */
 
-#define CFG_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }
+/*
+ * When the watchdog is enabled, output must be fast enough in Linux.
+ */
+#ifdef CONFIG_WATCHDOG
+#define CFG_BAUDRATE_TABLE	{		38400, 57600, 115200 }
+#else
+#define CFG_BAUDRATE_TABLE	{  9600, 19200, 38400, 57600, 115200 }
+#endif
 
 /*
  * Low Level Configuration Settings
diff --git a/tools/env/README b/tools/env/README
index 2b54adf76bd..d8386f7f2d6 100644
--- a/tools/env/README
+++ b/tools/env/README
@@ -2,28 +2,43 @@
 This is a demo implementation of a Linux command line tool to access
 the U-Boot's environment variables.
 
-Configuration is done via #defines in the fw_env.h file. The
+For the run-time utiltity configuration uncomment the line
+#define CONFIG_FILE  "/etc/fw_env.config"
+in fw_env.h.
+
+See comments in the fw_env.config file for definitions for the
+particular board.
+
+Configuration can also be done via #defines in the fw_env.h file. The
 following lines are relevant:
 
 #define HAVE_REDUND	/* For systems with 2 env sectors */
 #define DEVICE1_NAME	"/dev/mtd1"
 #define DEVICE2_NAME	"/dev/mtd2"
-#define ENV1_SIZE	0x4000
-#define DEVICE1_ESIZE	0x4000
-#define ENV2_SIZE	0x4000
-#define DEVICE2_ESIZE	0x4000
+#define DEVICE1_OFFSET    0x0000
+#define ENV1_SIZE         0x4000
+#define DEVICE1_ESIZE     0x4000
+#define DEVICE2_OFFSET    0x0000
+#define ENV2_SIZE         0x4000
+#define DEVICE2_ESIZE     0x4000
 
 Current configuration matches the environment layout of the TRAB
 board.
 
 Un-define HAVE_REDUND, if you want to use the utlities on a system
-that does not have support for redundant environment enabled. The
-DEVICEx_NAME constants define which MTD character device(s) is (are)
-to be used to access the environment. If HAVE_REDUND is undefined,
-DEVICE2_NAME is ignored, as is ENV2_SIZE and DEVICE2_ESIZE. ENVx_SIZE
-defines the size in bytes taken by the environment, which may be less
-then flash sector size, if the environment takes less then 1 sector.
+that does not have support for redundant environment enabled.
+If HAVE_REDUND is undefined, DEVICE2_NAME is ignored,
+as is ENV2_SIZE and DEVICE2_ESIZE.
+
+The DEVICEx_NAME constants define which MTD character devices are to
+be used to access the environment.
+
+The DEVICEx_OFFSET constants define the environment offset within the
+MTD character device.
+
+ENVx_SIZE defines the size in bytes taken by the environment, which
+may be less then flash sector size, if the environment takes less
+then 1 sector.
+
 DEVICEx_ESIZE defines the size of the first sector in the flash
-partition where the environment resides. It is assumed that the
-environment is located in the first ENVx_SIZE bytes of the device
-DEVICEx_NAME.
+partition where the environment resides.
diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index 5bf75ac2c20..87b41ea5940 100644
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -41,6 +41,7 @@ typedef	unsigned char	uchar;
 
 typedef struct envdev_s {
 	uchar devname[16]; /* Device name */
+	ulong devoff;      /* Device offset */
 	ulong env_size;    /* environment size */
 	ulong erase_size;  /* device erase size */
 } envdev_t;
@@ -49,16 +50,13 @@ static envdev_t envdevices[2];
 static int curdev;
 
 #define DEVNAME(i)    envdevices[(i)].devname
+#define DEVOFFSET(i)  envdevices[(i)].devoff
 #define ENVSIZE(i)    envdevices[(i)].env_size
 #define DEVESIZE(i)   envdevices[(i)].erase_size
 
 #define CFG_ENV_SIZE ENVSIZE(curdev)
 
-#ifdef HAVE_REDUND
-#define ENV_SIZE (CFG_ENV_SIZE - sizeof(long) - 1)
-#else
-#define ENV_SIZE (CFG_ENV_SIZE - sizeof(long))
-#endif
+#define ENV_SIZE      getenvsize()
 
 typedef struct environment_s {
 	ulong	crc;		/* CRC32 over data bytes	*/
@@ -67,46 +65,103 @@ typedef struct environment_s {
 } env_t;
 
 static env_t environment;
-static int valid = 0;
 
-#ifdef HAVE_REDUND
+static int HaveRedundEnv = 0;
+
 static uchar active_flag = 1;
 static uchar obsolete_flag = 0;
-#endif
+
 
 #define XMK_STR(x)	#x
 #define MK_STR(x)	XMK_STR(x)
 
 static uchar default_environment[] = {
-#ifdef	CONFIG_BOOTARGS
+#if defined(CONFIG_BOOTARGS)
 	"bootargs="	CONFIG_BOOTARGS			"\0"
 #endif
-#ifdef	CONFIG_BOOTCOMMAND
+#if defined(CONFIG_BOOTCOMMAND)
 	"bootcmd="	CONFIG_BOOTCOMMAND		"\0"
 #endif
-#if (CONFIG_BOOTDELAY >= 0)
+#if defined(CONFIG_RAMBOOTCOMMAND)
+	"ramboot="	CONFIG_RAMBOOTCOMMAND		"\0"
+#endif
+#if defined(CONFIG_NFSBOOTCOMMAND)
+	"nfsboot="	CONFIG_NFSBOOTCOMMAND		"\0"
+#endif
+#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
 	"bootdelay="	MK_STR(CONFIG_BOOTDELAY)	"\0"
 #endif
-#if (CONFIG_BAUDRATE >= 0)
+#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
 	"baudrate="	MK_STR(CONFIG_BAUDRATE)		"\0"
 #endif
+#ifdef	CONFIG_LOADS_ECHO
+	"loads_echo="	MK_STR(CONFIG_LOADS_ECHO)	"\0"
+#endif
 #ifdef	CONFIG_ETHADDR
 	"ethaddr="	MK_STR(CONFIG_ETHADDR)		"\0"
 #endif
+#ifdef	CONFIG_ETH1ADDR
+	"eth1addr="	MK_STR(CONFIG_ETH1ADDR)		"\0"
+#endif
+#ifdef	CONFIG_ETH2ADDR
+	"eth2addr="	MK_STR(CONFIG_ETH2ADDR)		"\0"
+#endif
+#ifdef	CONFIG_ETHPRIME
+	"ethprime="	CONFIG_ETHPRIME			"\0"
+#endif
 #ifdef	CONFIG_IPADDR
 	"ipaddr="	MK_STR(CONFIG_IPADDR)		"\0"
 #endif
 #ifdef	CONFIG_SERVERIP
 	"serverip="	MK_STR(CONFIG_SERVERIP)		"\0"
 #endif
-	"\0"
+#ifdef	CFG_AUTOLOAD
+	"autoload="	CFG_AUTOLOAD			"\0"
+#endif
+#ifdef	CONFIG_ROOTPATH
+	"rootpath="	MK_STR(CONFIG_ROOTPATH)		"\0"
+#endif
+#ifdef	CONFIG_GATEWAYIP
+	"gatewayip="	MK_STR(CONFIG_GATEWAYIP)	"\0"
+#endif
+#ifdef	CONFIG_NETMASK
+	"netmask="	MK_STR(CONFIG_NETMASK)		"\0"
+#endif
+#ifdef	CONFIG_HOSTNAME
+	"hostname="	MK_STR(CONFIG_HOSTNAME)		"\0"
+#endif
+#ifdef	CONFIG_BOOTFILE
+	"bootfile="	MK_STR(CONFIG_BOOTFILE)		"\0"
+#endif
+#ifdef	CONFIG_LOADADDR
+	"loadaddr="	MK_STR(CONFIG_LOADADDR)		"\0"
+#endif
+#ifdef	CONFIG_PREBOOT
+	"preboot="	CONFIG_PREBOOT			"\0"
+#endif
+#ifdef	CONFIG_CLOCKS_IN_MHZ
+	"clocks_in_mhz=" "1"				"\0"
+#endif
+#ifdef  CONFIG_EXTRA_ENV_SETTINGS
+	CONFIG_EXTRA_ENV_SETTINGS
+#endif
+	"\0"		/* Termimate env_t data with 2 NULs */
 };
 
 static int  flash_io (int mode);
 static uchar *envmatch(uchar *s1, uchar *s2);
 static int env_init(void);
 static int parse_config(void);
-
+#if defined(CONFIG_FILE)
+static int get_config(char *);
+#endif
+static inline ulong getenvsize(void)
+{
+	ulong rc = CFG_ENV_SIZE - sizeof(long);
+	if (HaveRedundEnv)
+		rc -= sizeof(char);
+	return rc;
+}
 
 /*
  * Search the environment for a variable.
@@ -338,34 +393,37 @@ static int flash_io (int mode)
 		return (-1);
 	}
 
-	len = sizeof(environment.crc) + sizeof(environment.flags);
+	len = sizeof(environment.crc);
+	if (HaveRedundEnv) {
+		len += sizeof(environment.flags);
+	}
 
 	if (mode == O_RDWR) {
-#ifdef HAVE_REDUND
-		/* switch to next partition for writing */
-		otherdev = !curdev;
-		if ((fdr = open(DEVNAME(otherdev), mode)) < 0) {
-			fprintf (stderr, 
-					 "Can't open %s: %s\n", 
-					 DEVNAME(otherdev), strerror(errno));
-			return (-1);
+		if (HaveRedundEnv) {
+			/* switch to next partition for writing */
+			otherdev = !curdev;
+			if ((fdr = open(DEVNAME(otherdev), mode)) < 0) {
+				fprintf (stderr, 
+						 "Can't open %s: %s\n", 
+						 DEVNAME(otherdev), strerror(errno));
+				return (-1);
+			}
+		} else {
+			otherdev = curdev;
+			fdr = fd;
 		}
-#else
-		otherdev = curdev;
-		fdr = fd;
-		len = sizeof(environment.crc);
-#endif
 		printf("Unlocking flash...\n");
 		erase.length = DEVESIZE(otherdev);
-		erase.start = 0;
+		erase.start = DEVOFFSET(otherdev);
 		ioctl (fdr, MEMUNLOCK, &erase);
 
-#ifdef HAVE_REDUND
-		erase.length = DEVESIZE(curdev);
-		erase.start = 0;
-		ioctl (fd, MEMUNLOCK, &erase);
-		environment.flags = active_flag;
-#endif
+		if (HaveRedundEnv) {
+			erase.length = DEVESIZE(curdev);
+			erase.start = DEVOFFSET(curdev);
+			ioctl (fd, MEMUNLOCK, &erase);
+			environment.flags = active_flag;
+		}
+
 		printf("Done\n");
 		resid = DEVESIZE(otherdev) - CFG_ENV_SIZE;
 		if (resid) {
@@ -375,22 +433,16 @@ static int flash_io (int mode)
 				  resid, strerror(errno));
 				return (-1);
 			}
-			if (lseek (fdr, CFG_ENV_SIZE, SEEK_SET) == -1) {
+			if (lseek (fdr, DEVOFFSET(otherdev) + CFG_ENV_SIZE, SEEK_SET) == -1) {
 				fprintf (stderr,
 				  "seek error on %s: %s\n", 
-				   DEVNAME(curdev), strerror(errno));
+				   DEVNAME(otherdev), strerror(errno));
 				return (-1);
 			}
 			if ((rc = read (fdr, data, resid)) != resid) {
 				fprintf (stderr,
 				  "read error on %s: %s\n", 
-				  DEVNAME(curdev), strerror(errno));
-				return (-1);
-			}
-			if (lseek (fdr, 0, SEEK_SET) == -1) {
-				fprintf (stderr,
-				  "seek error on %s: %s\n", 
-				  DEVNAME(curdev), strerror(errno));
+				  DEVNAME(otherdev), strerror(errno));
 				return (-1);
 			}
 		}
@@ -398,6 +450,7 @@ static int flash_io (int mode)
 		printf("Erasing old environment...\n");
 
 		erase.length = DEVESIZE(otherdev);
+		erase.start = DEVOFFSET(otherdev);
 		if (ioctl (fdr, MEMERASE, &erase) != 0) {
 			fprintf (stderr, "MTD erase error on %s: %s\n",
 			  DEVNAME(otherdev), strerror(errno));
@@ -407,6 +460,12 @@ static int flash_io (int mode)
 		printf("Done\n");
 
 		printf("Writing environment to %s...\n",DEVNAME(otherdev));
+		if (lseek (fdr, DEVOFFSET(otherdev), SEEK_SET) == -1) {
+			fprintf (stderr,
+			  "seek error on %s: %s\n", 
+			  DEVNAME(otherdev), strerror(errno));
+			return (-1);
+		}
 		if (write(fdr, &environment, len) != len) {
 			fprintf (stderr,
 			  "CRC write error on %s: %s\n", 
@@ -428,43 +487,47 @@ static int flash_io (int mode)
 			}
 			free(data);
 		}
-#ifdef HAVE_REDUND
-		/* change flag on current active env partition */
-		if (lseek (fd, sizeof(ulong), SEEK_SET) == -1) {
-			fprintf (stderr,
-			  "seek error on %s: %s\n", 
-			  DEVNAME(curdev), strerror(errno));
-			return (-1);
-		}
-		if (write (fd, &obsolete_flag, sizeof(obsolete_flag)) != 
-			sizeof(obsolete_flag)) {
-			fprintf (stderr,
-			 "Write error on %s: %s\n", 
-			 DEVNAME(curdev), strerror(errno));
-			return (-1);
+		if (HaveRedundEnv) {
+			/* change flag on current active env partition */
+			if (lseek (fd, DEVOFFSET(curdev) + sizeof(ulong), SEEK_SET) == -1) {
+				fprintf (stderr,
+						 "seek error on %s: %s\n", 
+						 DEVNAME(curdev), strerror(errno));
+				return (-1);
+			}
+			if (write (fd, &obsolete_flag, sizeof(obsolete_flag)) != 
+				sizeof(obsolete_flag)) {
+				fprintf (stderr,
+						 "Write error on %s: %s\n", 
+						 DEVNAME(curdev), strerror(errno));
+				return (-1);
+			}
 		}
-#endif
 		printf("Done\n");
 		printf("Locking ...\n");
 		erase.length = DEVESIZE(otherdev);
-		erase.start = 0;
+		erase.start = DEVOFFSET(otherdev);
 		ioctl (fdr, MEMLOCK, &erase);
-#ifdef HAVE_REDUND
-		erase.length = DEVESIZE(curdev);
-		erase.start = 0;
-		ioctl (fd, MEMLOCK, &erase);
-		if (close(fdr)) {
-			fprintf (stderr,
-			 "I/O error on %s: %s\n", 
-			 DEVNAME(otherdev), strerror(errno));
-			return (-1);
+		if (HaveRedundEnv) {
+			erase.length = DEVESIZE(curdev);
+			erase.start = DEVOFFSET(curdev);
+			ioctl (fd, MEMLOCK, &erase);
+			if (close(fdr)) {
+				fprintf (stderr,
+						 "I/O error on %s: %s\n", 
+						 DEVNAME(otherdev), strerror(errno));
+				return (-1);
+			}
 		}
-#endif
 		printf("Done\n");
 	} else {
-#ifndef HAVE_REDUND
-		len = sizeof(environment.crc);
-#endif
+
+		if (lseek (fd, DEVOFFSET(curdev), SEEK_SET) == -1) {
+			fprintf (stderr,
+					 "seek error on %s: %s\n", 
+					 DEVNAME(curdev), strerror(errno));
+			return (-1);
+		}
 		if (read (fd, &environment, len) != len) {
 			fprintf (stderr,
 			 "CRC read error on %s: %s\n", 
@@ -515,56 +578,52 @@ static int env_init(void)
 {
 	int crc1, crc1_ok;
 	uchar *addr1;
-#ifdef HAVE_REDUND
+
 	int crc2, crc2_ok;
 	uchar flag1, flag2, *addr2;
-#endif
 
+	if (parse_config()) /* should fill envdevices */
+		return 1;
 	
-	if (!valid) {
-
-		if (parse_config()) /* should fill envdevices */
-			return 1;
-
-		if ((addr1 = calloc (1, ENV_SIZE)) == NULL) {
-			fprintf (stderr, 
-			 "Not enough memory for environment (%ld bytes)\n",
-			 ENV_SIZE);
-			return (errno);
-		}
-
-		/* read environment from FLASH to local buffer */
-		environment.data = addr1;
-		curdev = 0;
-		if (flash_io (O_RDONLY)) {
-			return (errno);
-		}
-
-		crc1_ok = ((crc1 = crc32(0, environment.data, ENV_SIZE)) 
-			 == environment.crc);
-#ifndef HAVE_REDUND
+	if ((addr1 = calloc (1, ENV_SIZE)) == NULL) {
+		fprintf (stderr, 
+				 "Not enough memory for environment (%ld bytes)\n",
+				 ENV_SIZE);
+		return (errno);
+	}
+	
+	/* read environment from FLASH to local buffer */
+	environment.data = addr1;
+	curdev = 0;
+	if (flash_io (O_RDONLY)) {
+		return (errno);
+	}
+	
+	crc1_ok = ((crc1 = crc32(0, environment.data, ENV_SIZE)) 
+			   == environment.crc);
+	if (!HaveRedundEnv) {
 		if (!crc1_ok) {
 			fprintf (stderr, 
-			 "Warning: Bad CRC, using default environment\n");
+					 "Warning: Bad CRC, using default environment\n");
 			environment.data = default_environment;
 			free(addr1);
 		}
-#else
+	} else {
 		flag1 = environment.flags;
 		
 		curdev = 1;
 		if ((addr2 = calloc (1, ENV_SIZE)) == NULL) {
 			fprintf (stderr, 
-			 "Not enough memory for environment (%ld bytes)\n",
-			 ENV_SIZE);
+					 "Not enough memory for environment (%ld bytes)\n",
+					 ENV_SIZE);
 			return (errno);
 		}		
 		environment.data = addr2;
-
+		
 		if (flash_io (O_RDONLY)) {
 			return (errno);
 		}
-
+		
 		crc2_ok = ((crc2 = crc32(0, environment.data, ENV_SIZE)) 
 				   == environment.crc);
 		flag2 = environment.flags;
@@ -585,7 +644,7 @@ static int env_init(void)
 		}
 		else if (! crc1_ok && ! crc2_ok) {
 			fprintf (stderr, 
-			 "Warning: Bad CRC, using default environment\n");
+					 "Warning: Bad CRC, using default environment\n");
 			environment.data = default_environment;
 			curdev = 0;
 			free(addr2);
@@ -626,8 +685,6 @@ static int env_init(void)
 			curdev = 1;
 			free(addr1);
 		}
-#endif		
-		valid = 1;
 	}
 	return (0);
 }
@@ -637,26 +694,75 @@ static int parse_config()
 {
 	struct stat st;
 
-	if (stat (DEVICE1_NAME, &st)) {
-		fprintf (stderr, 
-		 "Cannot access MTD device %s: %s\n", 
-		 DEVICE1_NAME, strerror(errno));
+#if defined(CONFIG_FILE)
+	/* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
+	if (get_config(CONFIG_FILE)) {
+		fprintf (stderr,
+				 "Cannot parse config file: %s\n",
+				 strerror(errno));
 		return 1;
 	}
 
+#else
 	strcpy(DEVNAME(0), DEVICE1_NAME);
+	DEVOFFSET(0) = DEVICE1_OFFSET;
 	ENVSIZE(0) = ENV1_SIZE;
 	DEVESIZE(0) = DEVICE1_ESIZE;
 #ifdef HAVE_REDUND
-	if (stat (DEVICE2_NAME, &st)) {
-		fprintf (stderr, 
-		 "Cannot access MTD device %s: %s\n", 
-		 DEVICE2_NAME, strerror(errno));
-		return 1;
-	}
 	strcpy(DEVNAME(1), DEVICE2_NAME);
+	DEVOFFSET(1) = DEVICE2_OFFSET;
 	ENVSIZE(1) = ENV2_SIZE;
 	DEVESIZE(1) = DEVICE2_ESIZE;
+	HaveRedundEnv = 1;
 #endif
+#endif
+	if (stat (DEVNAME(0), &st)) {
+		fprintf (stderr, 
+		 "Cannot access MTD device %s: %s\n", 
+		 DEVNAME(0), strerror(errno));
+		return 1;
+	}
+	
+	if (HaveRedundEnv && stat (DEVNAME(1), &st)) {
+		fprintf (stderr, 
+		 "Cannot access MTD device %s: %s\n", 
+		 DEVNAME(2), strerror(errno));
+		return 1;
+	}
 	return 0;
 }
+
+#if defined(CONFIG_FILE)
+static int get_config (char *fname)
+{
+	FILE *fp;
+	int i = 0;
+	int rc;
+	char dump[128];
+
+	if ((fp = fopen(fname, "r")) == NULL) {
+		return 1;
+	}
+
+	while ((i < 2) && 
+		   ((rc = fscanf (fp, "%s %lx %lx %lx",
+						  DEVNAME(i), &DEVOFFSET(i), &ENVSIZE(i), &DEVESIZE(i))) != EOF)) {
+
+		/* Skip incomplete conversions and comment strings */
+		if ((rc < 3) || (*DEVNAME(i) == '#')) { 
+			fgets (dump, sizeof(dump), fp); /* Consume till end */
+			continue;
+		}
+
+		i++;
+	}
+	fclose(fp);
+	
+	HaveRedundEnv = i - 1;
+	if (!i) { /* No valid entries found */
+		errno = EINVAL;
+		return 1;
+	} else
+		return 0;
+}
+#endif
diff --git a/tools/env/fw_env.config b/tools/env/fw_env.config
new file mode 100644
index 00000000000..2432bd866c5
--- /dev/null
+++ b/tools/env/fw_env.config
@@ -0,0 +1,7 @@
+# Configuration file for fw_(printenv/saveenv) utility.
+# Up to two entries are valid, in this case the redundand
+# environment sector is assumed present.
+
+# MTD device name	Device offset	Env. size	Flash sector size
+/dev/mtd1		0x0000		0x4000		0x4000
+/dev/mtd2		0x0000		0x4000		0x4000
diff --git a/tools/env/fw_env.h b/tools/env/fw_env.h
index d98edc9975d..7d7be041573 100644
--- a/tools/env/fw_env.h
+++ b/tools/env/fw_env.h
@@ -21,11 +21,21 @@
  * MA 02111-1307 USA
  */
 
+/* 
+ * To build the utility with the run-time configuration 
+ * uncomment the next line.
+ * See included "fw_env.config" sample file (TRAB board)
+ * for notes on configuration.
+ */
+/*#define CONFIG_FILE     "/etc/fw_env.config" */
+
 #define HAVE_REDUND /* For systems with 2 env sectors */
 #define DEVICE1_NAME      "/dev/mtd1"
 #define DEVICE2_NAME      "/dev/mtd2"
+#define DEVICE1_OFFSET    0x0000
 #define ENV1_SIZE         0x4000
 #define DEVICE1_ESIZE     0x4000
+#define DEVICE2_OFFSET    0x0000
 #define ENV2_SIZE         0x4000
 #define DEVICE2_ESIZE     0x4000