Add U-Boot environment tools, move custom Makefile entries

7 files changed, 1413 insertions, 0 deletions

diff --git a/env/Makefile b/env/Makefile
new file mode 100644
index 0000000..2004a39
--- /dev/null
+++ b/env/Makefile
@@ -0,0 +1,20 @@
+EXEC = fw_env
+OBJS = crc32.o fw_env.o fw_env_main.o
+
+CPPFLAGS += -DUSE_HOSTCC
+
+all: $(EXEC)
+
+$(EXEC): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(EXTRALIBS) $(LDLIBS)
+
+romfs:
+	$(ROMFSINST) -d /bin/fw_env
+	test -e $(ROMFSDIR)/etc/fw_env.config || $(ROMFSINST) -d /etc/fw_env.config
+	$(ROMFSINST) -s fw_env /bin/fw_printenv
+	$(ROMFSINST) -s fw_env /bin/fw_setenv
+
+clean:
+	-rm -f *.o fw_env *.gdb
+
+.PHONY: all fw_env clean romfs
diff --git a/env/README b/env/README
new file mode 100644
index 0000000..91e679a
--- /dev/null
+++ b/env/README
@@ -0,0 +1,54 @@
+
+This is a demo implementation of a Linux command line tool to access
+the U-Boot's environment variables.
+
+For the run-time utiltity configuration uncomment the line
+#define CONFIG_FILE  "/etc/fw_env.config"
+in fw_env.h.
+
+For building against older versions of the MTD headers (meaning before
+v2.6.8-rc1) it is required to pass the argument "MTD_VERSION=old" to
+make.
+
+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 DEVICE1_OFFSET    0x0000
+#define ENV1_SIZE         0x4000
+#define DEVICE1_ESIZE     0x4000
+#define DEVICE1_ENVSECTORS     2
+#define DEVICE2_OFFSET    0x0000
+#define ENV2_SIZE         0x4000
+#define DEVICE2_ESIZE     0x4000
+#define DEVICE2_ENVSECTORS     2
+
+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.
+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.
+
+DEVICEx_ENVSECTORS defines the number of sectors that may be used for
+this environment instance. On NAND this is used to limit the range
+within which bad blocks are skipped, on NOR it is not used.
diff --git a/env/crc32.c b/env/crc32.c
new file mode 100644
index 0000000..9e03df0
--- /dev/null
+++ b/env/crc32.c
@@ -0,0 +1,71 @@
+#include <stdlib.h>
+#include <stdint.h>
+
+#define BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL << (n)) - 1))
+
+/* Table computed with Mark Adler's makecrc.c utility.  */
+static const uint32_t crc32_table[256] = {
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
+	0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
+	0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
+	0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
+	0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
+	0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
+	0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
+	0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
+	0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
+	0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
+	0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
+	0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
+	0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
+	0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
+	0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
+	0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
+	0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
+	0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
+	0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
+	0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
+	0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
+	0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
+	0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
+	0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
+	0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
+	0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
+	0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
+	0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
+	0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
+	0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
+	0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
+	0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
+	0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
+	0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
+	0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
+	0x2d02ef8d
+};
+
+uint32_t crc32(uint32_t crc, uint8_t *buf, size_t len)
+{
+	uint8_t *end;
+
+	crc = ~crc;
+	for (end = buf + len; buf < end; buf++)
+		crc = crc32_table[(crc ^ *buf) & BIT_MASK(8)] ^ (crc >> 8);
+
+	return ~crc;
+}
diff --git a/env/fw_env.c b/env/fw_env.c
new file mode 100644
index 0000000..a46205d
--- /dev/null
+++ b/env/fw_env.c
@@ -0,0 +1,1122 @@
+/*
+ * (C) Copyright 2000-2008
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2008
+ * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.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
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#ifdef MTD_OLD
+# include <stdint.h>
+# include <linux/mtd/mtd.h>
+#else
+# define  __user	/* nothing */
+# include <mtd/mtd-user.h>
+#endif
+
+#include "fw_env.h"
+
+#define	CMD_GETENV	"fw_printenv"
+#define	CMD_SETENV	"fw_setenv"
+
+#define min(x, y) ({				\
+	typeof(x) _min1 = (x);			\
+	typeof(y) _min2 = (y);			\
+	(void) (&_min1 == &_min2);		\
+	_min1 < _min2 ? _min1 : _min2; })
+
+struct envdev_s {
+	char devname[16];		/* Device name */
+	ulong devoff;			/* Device offset */
+	ulong env_size;			/* environment size */
+	ulong erase_size;		/* device erase size */
+	ulong env_sectors;		/* number of environment sectors */
+	uint8_t mtd_type;		/* type of the MTD device */
+};
+
+static struct envdev_s envdevices[2] =
+{
+	{
+		.mtd_type = MTD_ABSENT,
+	}, {
+		.mtd_type = MTD_ABSENT,
+	},
+};
+static int dev_current;
+
+#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 ENVSECTORS(i) envdevices[(i)].env_sectors
+#define DEVTYPE(i)    envdevices[(i)].mtd_type
+
+#define CONFIG_ENV_SIZE ENVSIZE(dev_current)
+
+#define ENV_SIZE      getenvsize()
+
+struct env_image_single {
+	uint32_t	crc;	/* CRC32 over data bytes    */
+	char		data[];
+};
+
+struct env_image_redundant {
+	uint32_t	crc;	/* CRC32 over data bytes    */
+	unsigned char	flags;	/* active or obsolete */
+	char		data[];
+};
+
+enum flag_scheme {
+	FLAG_NONE,
+	FLAG_BOOLEAN,
+	FLAG_INCREMENTAL,
+};
+
+struct environment {
+	void			*image;
+	uint32_t		*crc;
+	unsigned char		*flags;
+	char			*data;
+	enum flag_scheme	flag_scheme;
+};
+
+static struct environment environment = {
+	.flag_scheme = FLAG_NONE,
+};
+
+static int HaveRedundEnv = 0;
+
+static unsigned char active_flag = 1;
+/* obsolete_flag must be 0 to efficiently set it on NOR flash without erasing */
+static unsigned char obsolete_flag = 0;
+
+
+#define XMK_STR(x)	#x
+#define MK_STR(x)	XMK_STR(x)
+
+static char default_environment[] = {
+#if defined(CONFIG_BOOTARGS)
+	"bootargs=" CONFIG_BOOTARGS "\0"
+#endif
+#if defined(CONFIG_BOOTCOMMAND)
+	"bootcmd=" CONFIG_BOOTCOMMAND "\0"
+#endif
+#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 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_ETH3ADDR
+	"eth3addr=" MK_STR (CONFIG_ETH3ADDR) "\0"
+#endif
+#ifdef	CONFIG_ETH4ADDR
+	"eth4addr=" MK_STR (CONFIG_ETH4ADDR) "\0"
+#endif
+#ifdef	CONFIG_ETH5ADDR
+	"eth5addr=" MK_STR (CONFIG_ETH5ADDR) "\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
+#ifdef	CONFIG_SYS_AUTOLOAD
+	"autoload=" CONFIG_SYS_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
+#if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
+	"pcidelay=" MK_STR (CONFIG_PCI_BOOTDELAY) "\0"
+#endif
+#ifdef  CONFIG_EXTRA_ENV_SETTINGS
+	CONFIG_EXTRA_ENV_SETTINGS
+#endif
+	"\0"		/* Termimate struct environment data with 2 NULs */
+};
+
+static int flash_io (int mode);
+static char *envmatch (char * s1, char * 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 = CONFIG_ENV_SIZE - sizeof (long);
+
+	if (HaveRedundEnv)
+		rc -= sizeof (char);
+	return rc;
+}
+
+/*
+ * Search the environment for a variable.
+ * Return the value, if found, or NULL, if not found.
+ */
+char *fw_getenv (char *name)
+{
+	char *env, *nxt;
+
+	if (env_init ())
+		return NULL;
+
+	for (env = environment.data; *env; env = nxt + 1) {
+		char *val;
+
+		for (nxt = env; *nxt; ++nxt) {
+			if (nxt >= &environment.data[ENV_SIZE]) {
+				fprintf (stderr, "## Error: "
+					"environment not terminated\n");
+				return NULL;
+			}
+		}
+		val = envmatch (name, env);
+		if (!val)
+			continue;
+		return val;
+	}
+	return NULL;
+}
+
+/*
+ * Print the current definition of one, or more, or all
+ * environment variables
+ */
+int fw_printenv (int argc, char *argv[])
+{
+	char *env, *nxt;
+	int i, n_flag;
+	int rc = 0;
+
+	if (env_init ())
+		return -1;
+
+	if (argc == 1) {		/* Print all env variables  */
+		for (env = environment.data; *env; env = nxt + 1) {
+			for (nxt = env; *nxt; ++nxt) {
+				if (nxt >= &environment.data[ENV_SIZE]) {
+					fprintf (stderr, "## Error: "
+						"environment not terminated\n");
+					return -1;
+				}
+			}
+
+			printf ("%s\n", env);
+		}
+		return 0;
+	}
+
+	if (strcmp (argv[1], "-n") == 0) {
+		n_flag = 1;
+		++argv;
+		--argc;
+		if (argc != 2) {
+			fprintf (stderr, "## Error: "
+				"`-n' option requires exactly one argument\n");
+			return -1;
+		}
+	} else {
+		n_flag = 0;
+	}
+
+	for (i = 1; i < argc; ++i) {	/* print single env variables   */
+		char *name = argv[i];
+		char *val = NULL;
+
+		for (env = environment.data; *env; env = nxt + 1) {
+
+			for (nxt = env; *nxt; ++nxt) {
+				if (nxt >= &environment.data[ENV_SIZE]) {
+					fprintf (stderr, "## Error: "
+						"environment not terminated\n");
+					return -1;
+				}
+			}
+			val = envmatch (name, env);
+			if (val) {
+				if (!n_flag) {
+					fputs (name, stdout);
+					putc ('=', stdout);
+				}
+				puts (val);
+				break;
+			}
+		}
+		if (!val) {
+			fprintf (stderr, "## Error: \"%s\" not defined\n", name);
+			rc = -1;
+		}
+	}
+
+	return rc;
+}
+
+/*
+ * Deletes or sets environment variables. Returns -1 and sets errno error codes:
+ * 0	  - OK
+ * EINVAL - need at least 1 argument
+ * EROFS  - certain variables ("ethaddr", "serial#") cannot be
+ *	    modified or deleted
+ *
+ */
+int fw_setenv (int argc, char *argv[])
+{
+	int i, len;
+	char *env, *nxt;
+	char *oldval = NULL;
+	char *name;
+
+	if (argc < 2) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (env_init ())
+		return -1;
+
+	name = argv[1];
+
+	/*
+	 * search if variable with this name already exists
+	 */
+	for (nxt = env = environment.data; *env; env = nxt + 1) {
+		for (nxt = env; *nxt; ++nxt) {
+			if (nxt >= &environment.data[ENV_SIZE]) {
+				fprintf (stderr, "## Error: "
+					"environment not terminated\n");
+				errno = EINVAL;
+				return -1;
+			}
+		}
+		if ((oldval = envmatch (name, env)) != NULL)
+			break;
+	}
+
+	/*
+	 * Delete any existing definition
+	 */
+	if (oldval) {
+		/*
+		 * Ethernet Address and serial# can be set only once
+		 */
+		if ((strcmp (name, "ethaddr") == 0) ||
+			(strcmp (name, "serial#") == 0)) {
+			fprintf (stderr, "Can't overwrite \"%s\"\n", name);
+			errno = EROFS;
+			return -1;
+		}
+
+		if (*++nxt == '\0') {
+			*env = '\0';
+		} else {
+			for (;;) {
+				*env = *nxt++;
+				if ((*env == '\0') && (*nxt == '\0'))
+					break;
+				++env;
+			}
+		}
+		*++env = '\0';
+	}
+
+	/* Delete only ? */
+	if (argc < 3)
+		goto WRITE_FLASH;
+
+	/*
+	 * Append new definition at the end
+	 */
+	for (env = environment.data; *env || *(env + 1); ++env);
+	if (env > environment.data)
+		++env;
+	/*
+	 * Overflow when:
+	 * "name" + "=" + "val" +"\0\0"  > CONFIG_ENV_SIZE - (env-environment)
+	 */
+	len = strlen (name) + 2;
+	/* add '=' for first arg, ' ' for all others */
+	for (i = 2; i < argc; ++i) {
+		len += strlen (argv[i]) + 1;
+	}
+	if (len > (&environment.data[ENV_SIZE] - env)) {
+		fprintf (stderr,
+			"Error: environment overflow, \"%s\" deleted\n",
+			name);
+		return -1;
+	}
+	while ((*env = *name++) != '\0')
+		env++;
+	for (i = 2; i < argc; ++i) {
+		char *val = argv[i];
+
+		*env = (i == 2) ? '=' : ' ';
+		while ((*++env = *val++) != '\0');
+	}
+
+	/* end is marked with double '\0' */
+	*++env = '\0';
+
+  WRITE_FLASH:
+
+	/*
+	 * Update CRC
+	 */
+	*environment.crc = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
+
+	/* write environment back to flash */
+	if (flash_io (O_RDWR)) {
+		fprintf (stderr, "Error: can't write fw_env to flash\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * Test for bad block on NAND, just returns 0 on NOR, on NAND:
+ * 0	- block is good
+ * > 0	- block is bad
+ * < 0	- failed to test
+ */
+static int flash_bad_block (int fd, uint8_t mtd_type, loff_t *blockstart)
+{
+	if (mtd_type == MTD_NANDFLASH) {
+		int badblock = ioctl (fd, MEMGETBADBLOCK, blockstart);
+
+		if (badblock < 0) {
+			perror ("Cannot read bad block mark");
+			return badblock;
+		}
+
+		if (badblock) {
+#ifdef DEBUG
+			fprintf (stderr, "Bad block at 0x%llx, "
+				 "skipping\n", *blockstart);
+#endif
+			return badblock;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Read data from flash at an offset into a provided buffer. On NAND it skips
+ * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
+ * the DEVOFFSET (dev) block. On NOR the loop is only run once.
+ */
+static int flash_read_buf (int dev, int fd, void *buf, size_t count,
+			   off_t offset, uint8_t mtd_type)
+{
+	size_t blocklen;	/* erase / write length - one block on NAND,
+				   0 on NOR */
+	size_t processed = 0;	/* progress counter */
+	size_t readlen = count;	/* current read length */
+	off_t top_of_range;	/* end of the last block we may use */
+	off_t block_seek;	/* offset inside the current block to the start
+				   of the data */
+	loff_t blockstart;	/* running start of the current block -
+				   MEMGETBADBLOCK needs 64 bits */
+	int rc;
+
+	/*
+	 * Start of the first block to be read, relies on the fact, that
+	 * erase sector size is always a power of 2
+	 */
+	blockstart = offset & ~(DEVESIZE (dev) - 1);
+
+	/* Offset inside a block */
+	block_seek = offset - blockstart;
+
+	if (mtd_type == MTD_NANDFLASH) {
+		/*
+		 * NAND: calculate which blocks we are reading. We have
+		 * to read one block at a time to skip bad blocks.
+		 */
+		blocklen = DEVESIZE (dev);
+
+		/*
+		 * To calculate the top of the range, we have to use the
+		 * global DEVOFFSET (dev), which can be different from offset
+		 */
+		top_of_range = (DEVOFFSET (dev) & ~(blocklen - 1)) +
+			ENVSECTORS (dev) * blocklen;
+
+		/* Limit to one block for the first read */
+		if (readlen > blocklen - block_seek)
+			readlen = blocklen - block_seek;
+	} else {
+		blocklen = 0;
+		top_of_range = offset + count;
+	}
+
+	/* This only runs once on NOR flash */
+	while (processed < count) {
+		rc = flash_bad_block (fd, mtd_type, &blockstart);
+		if (rc < 0)		/* block test failed */
+			return -1;
+
+		if (blockstart + block_seek + readlen > top_of_range) {
+			/* End of range is reached */
+			fprintf (stderr,
+				 "Too few good blocks within range\n");
+			return -1;
+		}
+
+		if (rc) {		/* block is bad */
+			blockstart += blocklen;
+			continue;
+		}
+
+		/*
+		 * If a block is bad, we retry in the next block at the same
+		 * offset - see common/env_nand.c::writeenv()
+		 */
+		lseek (fd, blockstart + block_seek, SEEK_SET);
+
+		rc = read (fd, buf + processed, readlen);
+		if (rc != readlen) {
+			fprintf (stderr, "Read error on %s: %s\n",
+				 DEVNAME (dev), strerror (errno));
+			return -1;
+		}
+#ifdef DEBUG
+		fprintf (stderr, "Read 0x%x bytes at 0x%llx\n",
+			 rc, blockstart + block_seek);
+#endif
+		processed += readlen;
+		readlen = min (blocklen, count - processed);
+		block_seek = 0;
+		blockstart += blocklen;
+	}
+
+	return processed;
+}
+
+/*
+ * Write count bytes at offset, but stay within ENVSETCORS (dev) sectors of
+ * DEVOFFSET (dev). Similar to the read case above, on NOR we erase and write
+ * the whole data at once.
+ */
+static int flash_write_buf (int dev, int fd, void *buf, size_t count,
+			    off_t offset, uint8_t mtd_type)
+{
+	void *data;
+	struct erase_info_user erase;
+	size_t blocklen;	/* length of NAND block / NOR erase sector */
+	size_t erase_len;	/* whole area that can be erased - may include
+				   bad blocks */
+	size_t erasesize;	/* erase / write length - one block on NAND,
+				   whole area on NOR */
+	size_t processed = 0;	/* progress counter */
+	size_t write_total;	/* total size to actually write - excludinig
+				   bad blocks */
+	off_t erase_offset;	/* offset to the first erase block (aligned)
+				   below offset */
+	off_t block_seek;	/* offset inside the erase block to the start
+				   of the data */
+	off_t top_of_range;	/* end of the last block we may use */
+	loff_t blockstart;	/* running start of the current block -
+				   MEMGETBADBLOCK needs 64 bits */
+	int rc;
+
+	blocklen = DEVESIZE (dev);
+
+	/* Erase sector size is always a power of 2 */
+	top_of_range = (DEVOFFSET (dev) & ~(blocklen - 1)) +
+		ENVSECTORS (dev) * blocklen;
+
+	erase_offset = offset & ~(blocklen - 1);
+
+	/* Maximum area we may use */
+	erase_len = top_of_range - erase_offset;
+
+	blockstart = erase_offset;
+	/* Offset inside a block */
+	block_seek = offset - erase_offset;
+
+	/*
+	 * Data size we actually have to write: from the start of the block
+	 * to the start of the data, then count bytes of data, and to the
+	 * end of the block
+	 */
+	write_total = (block_seek + count + blocklen - 1) & ~(blocklen - 1);
+
+	/*
+	 * Support data anywhere within erase sectors: read out the complete
+	 * area to be erased, replace the environment image, write the whole
+	 * block back again.
+	 */
+	if (write_total > count) {
+		data = malloc (erase_len);
+		if (!data) {
+			fprintf (stderr,
+				 "Cannot malloc %u bytes: %s\n",
+				 erase_len, strerror (errno));
+			return -1;
+		}
+
+		rc = flash_read_buf (dev, fd, data, write_total, erase_offset,
+				     mtd_type);
+		if (write_total != rc)
+			return -1;
+
+		/* Overwrite the old environment */
+		memcpy (data + block_seek, buf, count);
+	} else {
+		/*
+		 * We get here, iff offset is block-aligned and count is a
+		 * multiple of blocklen - see write_total calculation above
+		 */
+		data = buf;
+	}
+
+	if (mtd_type == MTD_NANDFLASH) {
+		/*
+		 * NAND: calculate which blocks we are writing. We have
+		 * to write one block at a time to skip bad blocks.
+		 */
+		erasesize = blocklen;
+	} else {
+		erasesize = erase_len;
+	}
+
+	erase.length = erasesize;
+
+	/* This only runs once on NOR flash */
+	while (processed < write_total) {
+		rc = flash_bad_block (fd, mtd_type, &blockstart);
+		if (rc < 0)		/* block test failed */
+			return rc;
+
+		if (blockstart + erasesize > top_of_range) {
+			fprintf (stderr, "End of range reached, aborting\n");
+			return -1;
+		}
+
+		if (rc) {		/* block is bad */
+			blockstart += blocklen;
+			continue;
+		}
+
+		erase.start = blockstart;
+		ioctl (fd, MEMUNLOCK, &erase);
+
+		if (ioctl (fd, MEMERASE, &erase) != 0) {
+			fprintf (stderr, "MTD erase error on %s: %s\n",
+				 DEVNAME (dev),
+				 strerror (errno));
+			return -1;
+		}
+
+		if (lseek (fd, blockstart, SEEK_SET) == -1) {
+			fprintf (stderr,
+				 "Seek error on %s: %s\n",
+				 DEVNAME (dev), strerror (errno));
+			return -1;
+		}
+
+#ifdef DEBUG
+		printf ("Write 0x%x bytes at 0x%llx\n", erasesize, blockstart);
+#endif
+		if (write (fd, data + processed, erasesize) != erasesize) {
+			fprintf (stderr, "Write error on %s: %s\n",
+				 DEVNAME (dev), strerror (errno));
+			return -1;
+		}
+
+		ioctl (fd, MEMLOCK, &erase);
+
+		processed  += blocklen;
+		block_seek = 0;
+		blockstart += blocklen;
+	}
+
+	if (write_total > count)
+		free (data);
+
+	return processed;
+}
+
+/*
+ * Set obsolete flag at offset - NOR flash only
+ */
+static int flash_flag_obsolete (int dev, int fd, off_t offset)
+{
+	int rc;
+
+	/* This relies on the fact, that obsolete_flag == 0 */
+	rc = lseek (fd, offset, SEEK_SET);
+	if (rc < 0) {
+		fprintf (stderr, "Cannot seek to set the flag on %s \n",
+			 DEVNAME (dev));
+		return rc;
+	}
+	rc = write (fd, &obsolete_flag, sizeof (obsolete_flag));
+	if (rc < 0)
+		perror ("Could not set obsolete flag");
+
+	return rc;
+}
+
+static int flash_write (int fd_current, int fd_target, int dev_target)
+{
+	int rc;
+
+	switch (environment.flag_scheme) {
+	case FLAG_NONE:
+		break;
+	case FLAG_INCREMENTAL:
+		(*environment.flags)++;
+		break;
+	case FLAG_BOOLEAN:
+		*environment.flags = active_flag;
+		break;
+	default:
+		fprintf (stderr, "Unimplemented flash scheme %u \n",
+			 environment.flag_scheme);
+		return -1;
+	}
+
+#ifdef DEBUG
+	printf ("Writing new environment at 0x%lx on %s\n",
+		DEVOFFSET (dev_target), DEVNAME (dev_target));
+#endif
+	rc = flash_write_buf (dev_target, fd_target, environment.image,
+			      CONFIG_ENV_SIZE, DEVOFFSET (dev_target),
+			      DEVTYPE(dev_target));
+	if (rc < 0)
+		return rc;
+
+	if (environment.flag_scheme == FLAG_BOOLEAN) {
+		/* Have to set obsolete flag */
+		off_t offset = DEVOFFSET (dev_current) +
+			offsetof (struct env_image_redundant, flags);
+#ifdef DEBUG
+		printf ("Setting obsolete flag in environment at 0x%lx on %s\n",
+			DEVOFFSET (dev_current), DEVNAME (dev_current));
+#endif
+		flash_flag_obsolete (dev_current, fd_current, offset);
+	}
+
+	return 0;
+}
+
+static int flash_read (int fd)
+{
+	struct mtd_info_user mtdinfo;
+	int rc;
+
+	rc = ioctl (fd, MEMGETINFO, &mtdinfo);
+	if (rc < 0) {
+		perror ("Cannot get MTD information");
+		return -1;
+	}
+
+	if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) {
+		fprintf (stderr, "Unsupported flash type %u\n", mtdinfo.type);
+		return -1;
+	}
+
+	DEVTYPE(dev_current) = mtdinfo.type;
+
+	rc = flash_read_buf (dev_current, fd, environment.image, CONFIG_ENV_SIZE,
+			     DEVOFFSET (dev_current), mtdinfo.type);
+
+	return (rc != CONFIG_ENV_SIZE) ? -1 : 0;
+}
+
+static int flash_io (int mode)
+{
+	int fd_current, fd_target, rc, dev_target;
+
+	/* dev_current: fd_current, erase_current */
+	fd_current = open (DEVNAME (dev_current), mode);
+	if (fd_current < 0) {
+		fprintf (stderr,
+			 "Can't open %s: %s\n",
+			 DEVNAME (dev_current), strerror (errno));
+		return -1;
+	}
+
+	if (mode == O_RDWR) {
+		if (HaveRedundEnv) {
+			/* switch to next partition for writing */
+			dev_target = !dev_current;
+			/* dev_target: fd_target, erase_target */
+			fd_target = open (DEVNAME (dev_target), mode);
+			if (fd_target < 0) {
+				fprintf (stderr,
+					 "Can't open %s: %s\n",
+					 DEVNAME (dev_target),
+					 strerror (errno));
+				rc = -1;
+				goto exit;
+			}
+		} else {
+			dev_target = dev_current;
+			fd_target = fd_current;
+		}
+
+		rc = flash_write (fd_current, fd_target, dev_target);
+
+		if (HaveRedundEnv) {
+			if (close (fd_target)) {
+				fprintf (stderr,
+					"I/O error on %s: %s\n",
+					DEVNAME (dev_target),
+					strerror (errno));
+				rc = -1;
+			}
+		}
+	} else {
+		rc = flash_read (fd_current);
+	}
+
+exit:
+	if (close (fd_current)) {
+		fprintf (stderr,
+			 "I/O error on %s: %s\n",
+			 DEVNAME (dev_current), strerror (errno));
+		return -1;
+	}
+
+	return rc;
+}
+
+/*
+ * s1 is either a simple 'name', or a 'name=value' pair.
+ * s2 is a 'name=value' pair.
+ * If the names match, return the value of s2, else NULL.
+ */
+
+static char *envmatch (char * s1, char * s2)
+{
+
+	while (*s1 == *s2++)
+		if (*s1++ == '=')
+			return s2;
+	if (*s1 == '\0' && *(s2 - 1) == '=')
+		return s2;
+	return NULL;
+}
+
+/*
+ * Prevent confusion if running from erased flash memory
+ */
+static int env_init (void)
+{
+	int crc0, crc0_ok;
+	char flag0;
+	void *addr0;
+
+	int crc1, crc1_ok;
+	char flag1;
+	void *addr1;
+
+	struct env_image_single *single;
+	struct env_image_redundant *redundant;
+
+	if (parse_config ())		/* should fill envdevices */
+		return -1;
+
+	addr0 = calloc (1, CONFIG_ENV_SIZE);
+	if (addr0 == NULL) {
+		fprintf (stderr,
+			"Not enough memory for environment (%ld bytes)\n",
+			CONFIG_ENV_SIZE);
+		return -1;
+	}
+
+	/* read environment from FLASH to local buffer */
+	environment.image = addr0;
+
+	if (HaveRedundEnv) {
+		redundant = addr0;
+		environment.crc		= &redundant->crc;
+		environment.flags	= &redundant->flags;
+		environment.data	= redundant->data;
+	} else {
+		single = addr0;
+		environment.crc		= &single->crc;
+		environment.flags	= NULL;
+		environment.data	= single->data;
+	}
+
+	dev_current = 0;
+	if (flash_io (O_RDONLY))
+		return -1;
+
+	crc0 = crc32 (0, (uint8_t *) environment.data, ENV_SIZE);
+	crc0_ok = (crc0 == *environment.crc);
+	if (!HaveRedundEnv) {
+		if (!crc0_ok) {
+			fprintf (stderr,
+				"Warning: Bad CRC, using default environment\n");
+			memcpy(environment.data, default_environment, sizeof default_environment);
+		}
+	} else {
+		flag0 = *environment.flags;
+
+		dev_current = 1;
+		addr1 = calloc (1, CONFIG_ENV_SIZE);
+		if (addr1 == NULL) {
+			fprintf (stderr,
+				"Not enough memory for environment (%ld bytes)\n",
+				CONFIG_ENV_SIZE);
+			return -1;
+		}
+		redundant = addr1;
+
+		/*
+		 * have to set environment.image for flash_read(), careful -
+		 * other pointers in environment still point inside addr0
+		 */
+		environment.image = addr1;
+		if (flash_io (O_RDONLY))
+			return -1;
+
+		/* Check flag scheme compatibility */
+		if (DEVTYPE(dev_current) == MTD_NORFLASH &&
+		    DEVTYPE(!dev_current) == MTD_NORFLASH) {
+			environment.flag_scheme = FLAG_BOOLEAN;
+		} else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
+			   DEVTYPE(!dev_current) == MTD_NANDFLASH) {
+			environment.flag_scheme = FLAG_INCREMENTAL;
+		} else {
+			fprintf (stderr, "Incompatible flash types!\n");
+			return -1;
+		}
+
+		crc1 = crc32 (0, (uint8_t *) redundant->data, ENV_SIZE);
+		crc1_ok = (crc1 == redundant->crc);
+		flag1 = redundant->flags;
+
+		if (crc0_ok && !crc1_ok) {
+			dev_current = 0;
+		} else if (!crc0_ok && crc1_ok) {
+			dev_current = 1;
+		} else if (!crc0_ok && !crc1_ok) {
+			fprintf (stderr,
+				"Warning: Bad CRC, using default environment\n");
+			memcpy (environment.data, default_environment,
+				sizeof default_environment);
+			dev_current = 0;
+		} else {
+			switch (environment.flag_scheme) {
+			case FLAG_BOOLEAN:
+				if (flag0 == active_flag &&
+				    flag1 == obsolete_flag) {
+					dev_current = 0;
+				} else if (flag0 == obsolete_flag &&
+					   flag1 == active_flag) {
+					dev_current = 1;
+				} else if (flag0 == flag1) {
+					dev_current = 0;
+				} else if (flag0 == 0xFF) {
+					dev_current = 0;
+				} else if (flag1 == 0xFF) {
+					dev_current = 1;
+				} else {
+					dev_current = 0;
+				}
+				break;
+			case FLAG_INCREMENTAL:
+				if ((flag0 == 255 && flag1 == 0) ||
+				    flag1 > flag0)
+					dev_current = 1;
+				else if ((flag1 == 255 && flag0 == 0) ||
+					 flag0 > flag1)
+					dev_current = 0;
+				else /* flags are equal - almost impossible */
+					dev_current = 0;
+				break;
+			default:
+				fprintf (stderr, "Unknown flag scheme %u \n",
+					 environment.flag_scheme);
+				return -1;
+			}
+		}
+
+		/*
+		 * If we are reading, we don't need the flag and the CRC any
+		 * more, if we are writing, we will re-calculate CRC and update
+		 * flags before writing out
+		 */
+		if (dev_current) {
+			environment.image	= addr1;
+			environment.crc		= &redundant->crc;
+			environment.flags	= &redundant->flags;
+			environment.data	= redundant->data;
+			free (addr0);
+		} else {
+			environment.image	= addr0;
+			/* Other pointers are already set */
+			free (addr1);
+		}
+	}
+	return 0;
+}
+
+
+static int parse_config ()
+{
+	struct stat st;
+
+#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;
+	ENVSECTORS (0) = DEVICE1_ENVSECTORS;
+#ifdef HAVE_REDUND
+	strcpy (DEVNAME (1), DEVICE2_NAME);
+	DEVOFFSET (1) = DEVICE2_OFFSET;
+	ENVSIZE (1) = ENV2_SIZE;
+	DEVESIZE (1) = DEVICE2_ESIZE;
+	ENVSECTORS (1) = DEVICE2_ENVSECTORS;
+	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 (1), 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];
+
+	fp = fopen (fname, "r");
+	if (fp == NULL)
+		return -1;
+
+	while (i < 2 && fgets (dump, sizeof (dump), fp)) {
+		/* Skip incomplete conversions and comment strings */
+		if (dump[0] == '#')
+			continue;
+
+		rc = sscanf (dump, "%s %lx %lx %lx %lx",
+			     DEVNAME (i),
+			     &DEVOFFSET (i),
+			     &ENVSIZE (i),
+			     &DEVESIZE (i),
+			     &ENVSECTORS (i));
+
+		if (rc < 4)
+			continue;
+
+		if (rc < 5)
+			/* Default - 1 sector */
+			ENVSECTORS (i) = 1;
+
+		i++;
+	}
+	fclose (fp);
+
+	HaveRedundEnv = i - 1;
+	if (!i) {			/* No valid entries found */
+		errno = EINVAL;
+		return -1;
+	} else
+		return 0;
+}
+#endif
diff --git a/env/fw_env.config b/env/fw_env.config
new file mode 100644
index 0000000..6fba6ee
--- /dev/null
+++ b/env/fw_env.config
@@ -0,0 +1,11 @@
+# Configuration file for fw_(printenv/saveenv) utility.
+# Up to two entries are valid, in this case the redundant
+# environment sector is assumed present.
+# Notice, that the "Number of sectors" is ignored on NOR.
+
+# MTD device name	Device offset	Env. size	Flash sector size	Number of sectors
+/dev/mtd1		0x0000		0x10000		0x10000
+#/dev/mtd2		0x0000		0x4000		0x4000
+
+# NAND example
+#/dev/mtd0		0x4000		0x4000		0x20000			2
diff --git a/env/fw_env.h b/env/fw_env.h
new file mode 100644
index 0000000..6673cf8
--- /dev/null
+++ b/env/fw_env.h
@@ -0,0 +1,54 @@
+/*
+ * (C) Copyright 2002-2008
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.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
+ */
+
+/*
+ * 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
+
+#define CONFIG_BAUDRATE		115200
+#define CONFIG_BOOTDELAY	5	/* autoboot after 5 seconds	*/
+#define CONFIG_BOOTCOMMAND							\
+	"bootp; "								\
+	"setenv bootargs root=/dev/nfs nfsroot=${serverip}:${rootpath} "	\
+	"ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; "	\
+	"bootm"
+
+extern int   fw_printenv(int argc, char *argv[]);
+extern char *fw_getenv  (char *name);
+extern int fw_setenv  (int argc, char *argv[]);
+
+extern unsigned	long  crc32	 (unsigned long, const unsigned char *, unsigned);
diff --git a/env/fw_env_main.c b/env/fw_env_main.c
new file mode 100644
index 0000000..7f631c4
--- /dev/null
+++ b/env/fw_env_main.c
@@ -0,0 +1,81 @@
+/*
+ * (C) Copyright 2000-2008
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.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
+ */
+
+/*
+ * Command line user interface to firmware (=U-Boot) environment.
+ *
+ * Implements:
+ *	fw_printenv [[ -n name ] | [ name ... ]]
+ *              - prints the value of a single environment variable
+ *                "name", the ``name=value'' pairs of one or more
+ *                environment variables "name", or the whole
+ *                environment if no names are specified.
+ *	fw_setenv name [ value ... ]
+ *		- If a name without any values is given, the variable
+ *		  with this name is deleted from the environment;
+ *		  otherwise, all "value" arguments are concatenated,
+ *		  separated by single blank characters, and the
+ *		  resulting string is assigned to the environment
+ *		  variable "name"
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "fw_env.h"
+
+#define	CMD_PRINTENV	"fw_printenv"
+#define CMD_SETENV	"fw_setenv"
+
+int
+main(int argc, char *argv[])
+{
+	char *p;
+	char *cmdname = *argv;
+
+	if ((p = strrchr (cmdname, '/')) != NULL) {
+		cmdname = p + 1;
+	}
+
+	if (strcmp(cmdname, CMD_PRINTENV) == 0) {
+
+		if (fw_printenv (argc, argv) != 0)
+			return (EXIT_FAILURE);
+
+		return (EXIT_SUCCESS);
+
+	} else if (strcmp(cmdname, CMD_SETENV) == 0) {
+
+		if (fw_setenv (argc, argv) != 0)
+			return (EXIT_FAILURE);
+
+		return (EXIT_SUCCESS);
+
+	}
+
+	fprintf (stderr,
+		"Identity crisis - may be called as `" CMD_PRINTENV
+		"' or as `" CMD_SETENV "' but not as `%s'\n",
+		cmdname);
+	return (EXIT_FAILURE);
+}