X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=common%2Fcmd_nvedit.c;h=c3d63b8a4329b11ad113b985772809a9c1b437b9;hb=458379d674f256d32132e29c20a223a3c39b9e34;hp=aaf6d98da88c27497c59e85ef81702dfb96665e1;hpb=0a5676befb0c590212a53f7627fa5d0d8a84bf34;p=u-boot

diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index aaf6d98da8..c3d63b8a43 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2000-2002
+ * (C) Copyright 2000-2010
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
@@ -24,24 +24,26 @@
  * MA 02111-1307 USA
  */
 
-/**************************************************************************
- *
+/*
  * Support for persistent environment data
  *
- * The "environment" is stored as a list of '\0' terminated
- * "name=value" strings. The end of the list is marked by a double
- * '\0'. New entries are always added at the end. Deleting an entry
- * shifts the remaining entries to the front. Replacing an entry is a
- * combination of deleting the old value and adding the new one.
- *
- * The environment is preceeded by a 32 bit CRC over the data part.
+ * The "environment" is stored on external storage as a list of '\0'
+ * terminated "name=value" strings. The end of the list is marked by
+ * a double '\0'. The environment is preceeded by a 32 bit CRC over
+ * the data part and, in case of redundant environment, a byte of
+ * flags.
  *
- **************************************************************************
+ * This linearized representation will also be used before
+ * relocation, i. e. as long as we don't have a full C runtime
+ * environment. After that, we use a hash table.
  */
 
 #include <common.h>
 #include <command.h>
 #include <environment.h>
+#include <search.h>
+#include <errno.h>
+#include <malloc.h>
 #include <watchdog.h>
 #include <serial.h>
 #include <linux/stddef.h>
@@ -52,105 +54,122 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#if !defined(CFG_ENV_IS_IN_NVRAM)	&& \
-    !defined(CFG_ENV_IS_IN_EEPROM)	&& \
-    !defined(CFG_ENV_IS_IN_FLASH)	&& \
-    !defined(CFG_ENV_IS_IN_DATAFLASH)	&& \
-    !defined(CFG_ENV_IS_IN_NAND)	&& \
-    !defined(CFG_ENV_IS_IN_ONENAND)	&& \
-    !defined(CFG_ENV_IS_IN_SPI_FLASH)	&& \
-    !defined(CFG_ENV_IS_NOWHERE)
-# error Define one of CFG_ENV_IS_IN_{NVRAM|EEPROM|FLASH|DATAFLASH|ONENAND|SPI_FLASH|NOWHERE}
+#if !defined(CONFIG_ENV_IS_IN_EEPROM)	&& \
+    !defined(CONFIG_ENV_IS_IN_FLASH)	&& \
+    !defined(CONFIG_ENV_IS_IN_DATAFLASH)	&& \
+    !defined(CONFIG_ENV_IS_IN_MG_DISK)	&& \
+    !defined(CONFIG_ENV_IS_IN_MMC)  && \
+    !defined(CONFIG_ENV_IS_IN_NAND)	&& \
+    !defined(CONFIG_ENV_IS_IN_NVRAM)	&& \
+    !defined(CONFIG_ENV_IS_IN_ONENAND)	&& \
+    !defined(CONFIG_ENV_IS_IN_SPI_FLASH)	&& \
+    !defined(CONFIG_ENV_IS_NOWHERE)
+# error Define one of CONFIG_ENV_IS_IN_{EEPROM|FLASH|DATAFLASH|ONENAND|\
+SPI_FLASH|MG_DISK|NVRAM|MMC|NOWHERE}
 #endif
 
 #define XMK_STR(x)	#x
 #define MK_STR(x)	XMK_STR(x)
 
-/************************************************************************
-************************************************************************/
+/*
+ * Maximum expected input data size for import command
+ */
+#define	MAX_ENV_SIZE	(1 << 20)	/* 1 MiB */
 
 /*
  * Table with supported baudrates (defined in config_xyz.h)
  */
-static const unsigned long baudrate_table[] = CFG_BAUDRATE_TABLE;
+static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
 #define	N_BAUDRATES (sizeof(baudrate_table) / sizeof(baudrate_table[0]))
 
-
-/************************************************************************
- * Command interface: print one or all environment variables
+/*
+ * This variable is incremented on each do_env_set(), so it can
+ * be used via get_env_id() as an indication, if the environment
+ * has changed or not. So it is possible to reread an environment
+ * variable only if the environment was changed ... done so for
+ * example in NetInitLoop()
  */
+static int env_id = 1;
 
-int do_printenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int get_env_id (void)
 {
-	int i, j, k, nxt;
-	int rcode = 0;
-
-	if (argc == 1) {		/* Print all env variables	*/
-		for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
-			for (nxt=i; env_get_char(nxt) != '\0'; ++nxt)
-				;
-			for (k=i; k<nxt; ++k)
-				putc(env_get_char(k));
-			putc  ('\n');
+	return env_id;
+}
 
-			if (ctrlc()) {
-				puts ("\n ** Abort\n");
-				return 1;
-			}
-		}
+/*
+ * Command interface: print one or all environment variables
+ *
+ * Returns 0 in case of error, or length of printed string
+ */
+static int env_print(char *name)
+{
+	char *res = NULL;
+	size_t len;
+
+	if (name) {		/* print a single name */
+		ENTRY e, *ep;
+
+		e.key = name;
+		e.data = NULL;
+		ep = hsearch (e, FIND);
+		if (ep == NULL)
+			return 0;
+		len = printf ("%s=%s\n", ep->key, ep->data);
+		return len;
+	}
 
-		printf("\nEnvironment size: %d/%ld bytes\n", i, ENV_SIZE);
+	/* print whole list */
+	len = hexport('\n', &res, 0);
 
-		return 0;
+	if (len > 0) {
+		puts(res);
+		free(res);
+		return len;
 	}
 
-	for (i=1; i<argc; ++i) {	/* print single env variables	*/
-		char *name = argv[i];
+	/* should never happen */
+	return 0;
+}
 
-		k = -1;
+int do_env_print (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	int i;
+	int rcode = 0;
 
-		for (j=0; env_get_char(j) != '\0'; j=nxt+1) {
+	if (argc == 1) {
+		/* print all env vars */
+		rcode = env_print(NULL);
+		if (!rcode)
+			return 1;
+		printf("\nEnvironment size: %d/%ld bytes\n",
+			rcode, (ulong)ENV_SIZE);
+		return 0;
+	}
 
-			for (nxt=j; env_get_char(nxt) != '\0'; ++nxt)
-				;
-			k = envmatch((uchar *)name, j);
-			if (k < 0) {
-				continue;
-			}
-			puts (name);
-			putc ('=');
-			while (k < nxt)
-				putc(env_get_char(k++));
-			putc ('\n');
-			break;
-		}
-		if (k < 0) {
-			printf ("## Error: \"%s\" not defined\n", name);
-			rcode ++;
+	/* print selected env vars */
+	for (i = 1; i < argc; ++i) {
+		int rc = env_print(argv[i]);
+		if (!rc) {
+			printf("## Error: \"%s\" not defined\n", argv[i]);
+			++rcode;
 		}
 	}
+
 	return rcode;
 }
 
-/************************************************************************
+/*
  * Set a new environment variable,
  * or replace or delete an existing one.
- *
- * This function will ONLY work with a in-RAM copy of the environment
  */
 
-int _do_setenv (int flag, int argc, char *argv[])
+int _do_env_set (int flag, int argc, char * const argv[])
 {
-	int   i, len, oldval;
+	bd_t  *bd = gd->bd;
+	int   i, len;
 	int   console = -1;
-	uchar *env, *nxt = NULL;
-	char *name;
-	bd_t *bd = gd->bd;
-
-	uchar *env_data = env_get_addr(0);
-
-	if (!env_data)	/* need copy in RAM */
-		return 1;
+	char  *name, *value, *s;
+	ENTRY e, *ep;
 
 	name = argv[1];
 
@@ -159,73 +178,65 @@ int _do_setenv (int flag, int argc, char *argv[])
 		return 1;
 	}
 
+	env_id++;
 	/*
 	 * search if variable with this name already exists
 	 */
-	oldval = -1;
-	for (env=env_data; *env; env=nxt+1) {
-		for (nxt=env; *nxt; ++nxt)
-			;
-		if ((oldval = envmatch((uchar *)name, env-env_data)) >= 0)
-			break;
+	e.key = name;
+	e.data = NULL;
+	ep = hsearch (e, FIND);
+
+	/* Check for console redirection */
+	if (strcmp(name,"stdin") == 0) {
+		console = stdin;
+	} else if (strcmp(name,"stdout") == 0) {
+		console = stdout;
+	} else if (strcmp(name,"stderr") == 0) {
+		console = stderr;
 	}
 
-	/*
-	 * Delete any existing definition
-	 */
-	if (oldval >= 0) {
-#ifndef CONFIG_ENV_OVERWRITE
+	if (console != -1) {
+		if (argc < 3) {		/* Cannot delete it! */
+			printf("Can't delete \"%s\"\n", name);
+			return 1;
+		}
 
-		/*
-		 * Ethernet Address and serial# can be set only once,
-		 * ver is readonly.
-		 */
-		if (
-#ifdef CONFIG_HAS_UID
-		/* Allow serial# forced overwrite with 0xdeaf4add flag */
-		    ((strcmp (name, "serial#") == 0) && (flag != 0xdeaf4add)) ||
+#ifdef CONFIG_CONSOLE_MUX
+		i = iomux_doenv(console, argv[2]);
+		if (i)
+			return i;
 #else
-		    (strcmp (name, "serial#") == 0) ||
+		/* Try assigning specified device */
+		if (console_assign (console, argv[2]) < 0)
+			return 1;
+
+#ifdef CONFIG_SERIAL_MULTI
+		if (serial_assign (argv[2]) < 0)
+			return 1;
 #endif
+#endif /* CONFIG_CONSOLE_MUX */
+	}
+
+	/*
+	 * Some variables like "ethaddr" and "serial#" can be set only
+	 * once and cannot be deleted; also, "ver" is readonly.
+	 */
+	if (ep) {		/* variable exists */
+#ifndef CONFIG_ENV_OVERWRITE
+		if ((strcmp (name, "serial#") == 0) ||
 		    ((strcmp (name, "ethaddr") == 0)
 #if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
-		     && (strcmp ((char *)env_get_addr(oldval),MK_STR(CONFIG_ETHADDR)) != 0)
+		     && (strcmp (ep->data,MK_STR(CONFIG_ETHADDR)) != 0)
 #endif	/* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
 		    ) ) {
 			printf ("Can't overwrite \"%s\"\n", name);
 			return 1;
 		}
 #endif
-
-		/* Check for console redirection */
-		if (strcmp(name,"stdin") == 0) {
-			console = stdin;
-		} else if (strcmp(name,"stdout") == 0) {
-			console = stdout;
-		} else if (strcmp(name,"stderr") == 0) {
-			console = stderr;
-		}
-
-		if (console != -1) {
-			if (argc < 3) {		/* Cannot delete it! */
-				printf("Can't delete \"%s\"\n", name);
-				return 1;
-			}
-
-			/* Try assigning specified device */
-			if (console_assign (console, argv[2]) < 0)
-				return 1;
-
-#ifdef CONFIG_SERIAL_MULTI
-			if (serial_assign (argv[2]) < 0)
-				return 1;
-#endif
-		}
-
 		/*
 		 * Switch to new baudrate if new baudrate is supported
 		 */
-		if (strcmp(argv[1],"baudrate") == 0) {
+		if (strcmp(name,"baudrate") == 0) {
 			int baudrate = simple_strtoul(argv[2], NULL, 10);
 			int i;
 			for (i=0; i<N_BAUDRATES; ++i) {
@@ -252,97 +263,50 @@ int _do_setenv (int flag, int argc, char *argv[])
 				      break;
 			}
 		}
-
-		if (*++nxt == '\0') {
-			if (env > env_data) {
-				env--;
-			} else {
-				*env = '\0';
-			}
-		} else {
-			for (;;) {
-				*env = *nxt++;
-				if ((*env == '\0') && (*nxt == '\0'))
-					break;
-				++env;
-			}
-		}
-		*++env = '\0';
 	}
 
-#ifdef CONFIG_NET_MULTI
-	if (strncmp(name, "eth", 3) == 0) {
-		char *end;
-		int   num = simple_strtoul(name+3, &end, 10);
-
-		if (strcmp(end, "addr") == 0) {
-			eth_set_enetaddr(num, argv[2]);
-		}
-	}
-#endif
-
-
 	/* Delete only ? */
 	if ((argc < 3) || argv[2] == NULL) {
-		env_crc_update ();
-		return 0;
+		int rc = hdelete(name);
+		return !rc;
 	}
 
 	/*
-	 * Append new definition at the end
-	 */
-	for (env=env_data; *env || *(env+1); ++env)
-		;
-	if (env > env_data)
-		++env;
-	/*
-	 * Overflow when:
-	 * "name" + "=" + "val" +"\0\0"  > ENV_SIZE - (env-env_data)
+	 * Insert / replace new value
 	 */
-	len = strlen(name) + 2;
-	/* add '=' for first arg, ' ' for all others */
-	for (i=2; i<argc; ++i) {
+	for (i=2,len=0; i<argc; ++i) {
 		len += strlen(argv[i]) + 1;
 	}
-	if (len > (&env_data[ENV_SIZE]-env)) {
-		printf ("## Error: environment overflow, \"%s\" deleted\n", name);
+	if ((value = malloc(len)) == NULL) {
+		printf("## Can't malloc %d bytes\n", len);
 		return 1;
 	}
-	while ((*env = *name++) != '\0')
-		env++;
-	for (i=2; i<argc; ++i) {
-		char *val = argv[i];
+	for (i=2,s=value; i<argc; ++i) {
+		char *v = argv[i];
 
-		*env = (i==2) ? '=' : ' ';
-		while ((*++env = *val++) != '\0')
+		while ((*s++ = *v++) != '\0')
 			;
+		*(s-1) = ' ';
+	}
+	if (s != value)
+		*--s = '\0';
+
+	e.key  = name;
+	e.data = value;
+	ep = hsearch(e, ENTER);
+	free(value);
+	if (!ep) {
+		printf("## Error inserting \"%s\" variable, errno=%d\n",
+			name, errno);
+		return 1;
 	}
-
-	/* end is marked with double '\0' */
-	*++env = '\0';
-
-	/* Update CRC */
-	env_crc_update ();
 
 	/*
 	 * Some variables should be updated when the corresponding
-	 * entry in the enviornment is changed
+	 * entry in the environment is changed
 	 */
 
-	if (strcmp(argv[1],"ethaddr") == 0) {
-		char *s = argv[2];	/* always use only one arg */
-		char *e;
-		for (i=0; i<6; ++i) {
-			bd->bi_enetaddr[i] = s ? simple_strtoul(s, &e, 16) : 0;
-			if (s) s = (*e) ? e+1 : e;
-		}
-#ifdef CONFIG_NET_MULTI
-		eth_set_enetaddr(0, argv[2]);
-#endif
-		return 0;
-	}
-
-	if (strcmp(argv[1],"ipaddr") == 0) {
+	if (strcmp(name,"ipaddr") == 0) {
 		char *s = argv[2];	/* always use only one arg */
 		char *e;
 		unsigned long addr;
@@ -355,70 +319,46 @@ int _do_setenv (int flag, int argc, char *argv[])
 		}
 		bd->bi_ip_addr = htonl(addr);
 		return 0;
-	}
-	if (strcmp(argv[1],"loadaddr") == 0) {
+	} else if (strcmp(argv[1],"loadaddr") == 0) {
 		load_addr = simple_strtoul(argv[2], NULL, 16);
 		return 0;
 	}
 #if defined(CONFIG_CMD_NET)
-	if (strcmp(argv[1],"bootfile") == 0) {
+	else if (strcmp(argv[1],"bootfile") == 0) {
 		copy_filename (BootFile, argv[2], sizeof(BootFile));
 		return 0;
 	}
 #endif
-
-#ifdef CONFIG_AMIGAONEG3SE
-	if (strcmp(argv[1], "vga_fg_color") == 0 ||
-	    strcmp(argv[1], "vga_bg_color") == 0 ) {
-		extern void video_set_color(unsigned char attr);
-		extern unsigned char video_get_attr(void);
-
-		video_set_color(video_get_attr());
-		return 0;
-	}
-#endif	/* CONFIG_AMIGAONEG3SE */
-
 	return 0;
 }
 
 int setenv (char *varname, char *varvalue)
 {
-	char *argv[4] = { "setenv", varname, varvalue, NULL };
-	if (varvalue == NULL)
-		return _do_setenv (0, 2, argv);
+	char * const argv[4] = { "setenv", varname, varvalue, NULL };
+	if ((varvalue == NULL) || (varvalue[0] == '\0'))
+		return _do_env_set(0, 2, argv);
 	else
-		return _do_setenv (0, 3, argv);
-}
-
-#ifdef CONFIG_HAS_UID
-void forceenv (char *varname, char *varvalue)
-{
-	char *argv[4] = { "forceenv", varname, varvalue, NULL };
-	_do_setenv (0xdeaf4add, 3, argv);
+		return _do_env_set(0, 3, argv);
 }
-#endif
 
-int do_setenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_env_set (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
-	if (argc < 2) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
-		return 1;
-	}
+	if (argc < 2)
+		return cmd_usage(cmdtp);
 
-	return _do_setenv (flag, argc, argv);
+	return _do_env_set(flag, argc, argv);
 }
 
-/************************************************************************
+/*
  * Prompt for environment variable
  */
-
 #if defined(CONFIG_CMD_ASKENV)
-int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+int do_env_ask ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
-	extern char console_buffer[CFG_CBSIZE];
-	char message[CFG_CBSIZE];
-	int size = CFG_CBSIZE - 1;
-	int len;
+	extern char console_buffer[CONFIG_SYS_CBSIZE];
+	char message[CONFIG_SYS_CBSIZE];
+	int size = CONFIG_SYS_CBSIZE - 1;
+	int i, len, pos;
 	char *local_args[4];
 
 	local_args[0] = argv[0];
@@ -426,51 +366,41 @@ int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	local_args[2] = NULL;
 	local_args[3] = NULL;
 
-	if (argc < 2) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
-		return 1;
-	}
 	/* Check the syntax */
 	switch (argc) {
 	case 1:
-		printf ("Usage:\n%s\n", cmdtp->usage);
-		return 1;
+		return cmd_usage(cmdtp);
 
-	case 2:		/* askenv envname */
-		sprintf (message, "Please enter '%s':", argv[1]);
+	case 2:		/* env_ask envname */
+		sprintf(message, "Please enter '%s':", argv[1]);
 		break;
 
-	case 3:		/* askenv envname size */
-		sprintf (message, "Please enter '%s':", argv[1]);
-		size = simple_strtoul (argv[2], NULL, 10);
+	case 3:		/* env_ask envname size */
+		sprintf(message, "Please enter '%s':", argv[1]);
+		size = simple_strtoul(argv[2], NULL, 10);
 		break;
 
-	default:	/* askenv envname message1 ... messagen size */
-	    {
-		int i;
-		int pos = 0;
-
-		for (i = 2; i < argc - 1; i++) {
+	default:	/* env_ask envname message1 ... messagen size */
+		for (i=2,pos=0; i < argc - 1; i++) {
 			if (pos) {
 				message[pos++] = ' ';
 			}
-			strcpy (message+pos, argv[i]);
+			strcpy(message+pos, argv[i]);
 			pos += strlen(argv[i]);
 		}
 		message[pos] = '\0';
-		size = simple_strtoul (argv[argc - 1], NULL, 10);
-	    }
+		size = simple_strtoul(argv[argc - 1], NULL, 10);
 		break;
 	}
 
-	if (size >= CFG_CBSIZE)
-		size = CFG_CBSIZE - 1;
+	if (size >= CONFIG_SYS_CBSIZE)
+		size = CONFIG_SYS_CBSIZE - 1;
 
 	if (size <= 0)
 		return 1;
 
 	/* prompt for input */
-	len = readline (message);
+	len = readline(message);
 
 	if (size < len)
 		console_buffer[size] = '\0';
@@ -482,39 +412,67 @@ int do_askenv ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	}
 
 	/* Continue calling setenv code */
-	return _do_setenv (flag, len, local_args);
+	return _do_env_set(flag, len, local_args);
 }
 #endif
 
-/************************************************************************
+/*
+ * Interactively edit an environment variable
+ */
+#if defined(CONFIG_CMD_EDITENV)
+int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	char buffer[CONFIG_SYS_CBSIZE];
+	char *init_val;
+	int len;
+
+	if (argc < 2)
+		return cmd_usage(cmdtp);
+
+	/* Set read buffer to initial value or empty sting */
+	init_val = getenv(argv[1]);
+	if (init_val)
+		len = sprintf(buffer, "%s", init_val);
+	else
+		buffer[0] = '\0';
+
+	readline_into_buffer("edit: ", buffer);
+
+	return setenv(argv[1], buffer);
+}
+#endif /* CONFIG_CMD_EDITENV */
+
+/*
  * Look up variable from environment,
  * return address of storage for that variable,
  * or NULL if not found
  */
-
 char *getenv (char *name)
 {
-	int i, nxt;
+	if (gd->flags & GD_FLG_ENV_READY) {	/* after import into hashtable */
+		ENTRY e, *ep;
 
-	WATCHDOG_RESET();
+		WATCHDOG_RESET();
 
-	for (i=0; env_get_char(i) != '\0'; i=nxt+1) {
-		int val;
+		e.key  = name;
+		e.data = NULL;
+		ep = hsearch (e, FIND);
 
-		for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
-			if (nxt >= CFG_ENV_SIZE) {
-				return (NULL);
-			}
-		}
-		if ((val=envmatch((uchar *)name, i)) < 0)
-			continue;
-		return ((char *)env_get_addr(val));
+		return (ep ? ep->data : NULL);
 	}
 
-	return (NULL);
+	/* restricted capabilities before import */
+
+	if (getenv_f(name, (char *)(gd->env_buf), sizeof(gd->env_buf)) > 0)
+		return (char *)(gd->env_buf);
+
+	return NULL;
 }
 
-int getenv_r (char *name, char *buf, unsigned len)
+/*
+ * Look up variable from environment for restricted C runtime env.
+ */
+int getenv_f (char *name, char *buf, unsigned len)
 {
 	int i, nxt;
 
@@ -522,29 +480,32 @@ int getenv_r (char *name, char *buf, unsigned len)
 		int val, n;
 
 		for (nxt=i; env_get_char(nxt) != '\0'; ++nxt) {
-			if (nxt >= CFG_ENV_SIZE) {
+			if (nxt >= CONFIG_ENV_SIZE) {
 				return (-1);
 			}
 		}
 		if ((val=envmatch((uchar *)name, i)) < 0)
 			continue;
+
 		/* found; copy out */
-		n = 0;
-		while ((len > n++) && (*buf++ = env_get_char(val++)) != '\0')
-			;
-		if (len == n)
-			*buf = '\0';
-		return (n);
+		for (n=0; n<len; ++n, ++buf) {
+			if ((*buf = env_get_char(val++)) == '\0')
+				return n;
+		}
+
+		if (n)
+			*--buf = '\0';
+
+		printf("env_buf too small [%d]\n", len);
+
+		return n;
 	}
 	return (-1);
 }
 
-#if ((defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) \
-    || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_FLASH)) \
-    || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)) \
-    || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_ONENAND))) \
-    && !defined(CFG_ENV_IS_NOWHERE))
-int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
+
+int do_env_save (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	extern char * env_name_spec;
 
@@ -553,10 +514,16 @@ int do_saveenv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	return (saveenv() ? 1 : 0);
 }
 
+U_BOOT_CMD(
+	saveenv, 1, 0,	do_env_save,
+	"save environment variables to persistent storage",
+	""
+);
+
 #endif
 
 
-/************************************************************************
+/*
  * Match a name / name=value pair
  *
  * s1 is either a simple 'name', or a 'name=value' pair.
@@ -575,44 +542,373 @@ int envmatch (uchar *s1, int i2)
 	return(-1);
 }
 
+static int do_env_default(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+{
+	if ((argc != 2) || (strcmp(argv[1], "-f") != 0)) {
+		cmd_usage(cmdtp);
+		return 1;
+	}
+	set_default_env("## Resetting to default environment\n");
+	return 0;
+}
+
+static int do_env_delete(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+{
+	printf("Not implemented yet\n");
+	return 0;
+}
+
+/*
+ * env export [-t | -b | -c] addr [size]
+ *	-t:	export as text format; if size is given, data will be
+ *		padded with '\0' bytes; if not, one terminating '\0'
+ *		will be added (which is included in the "filesize"
+ *		setting so you can for exmple copy this to flash and
+ *		keep the termination).
+ *	-b:	export as binary format (name=value pairs separated by
+ *		'\0', list end marked by double "\0\0")
+ *	-c:	export as checksum protected environment format as
+ *		used for example by "saveenv" command
+ *	addr:	memory address where environment gets stored
+ *	size:	size of output buffer
+ *
+ * With "-c" and size is NOT given, then the export command will
+ * format the data as currently used for the persistent storage,
+ * i. e. it will use CONFIG_ENV_SECT_SIZE as output block size and
+ * prepend a valid CRC32 checksum and, in case of resundant
+ * environment, a "current" redundancy flag. If size is given, this
+ * value will be used instead of CONFIG_ENV_SECT_SIZE; again, CRC32
+ * checksum and redundancy flag will be inserted.
+ *
+ * With "-b" and "-t", always only the real data (including a
+ * terminating '\0' byte) will be written; here the optional size
+ * argument will be used to make sure not to overflow the user
+ * provided buffer; the command will abort if the size is not
+ * sufficient. Any remainign space will be '\0' padded.
+ *
+ * On successful return, the variable "filesize" will be set.
+ * Note that filesize includes the trailing/terminating '\0' byte(s).
+ *
+ * Usage szenario:  create a text snapshot/backup of the current settings:
+ *
+ *	=> env export -t 100000
+ *	=> era ${backup_addr} +${filesize}
+ *	=> cp.b 100000 ${backup_addr} ${filesize}
+ *
+ * Re-import this snapshot, deleting all other settings:
+ *
+ *	=> env import -d -t ${backup_addr}
+ */
+static int do_env_export(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	char	buf[32];
+	char	*addr, *cmd, *res;
+	size_t	size;
+	ssize_t	len;
+	env_t	*envp;
+	char	sep = '\n';
+	int	chk = 0;
+	int	fmt = 0;
+
+	cmd = *argv;
+
+	while (--argc > 0 && **++argv == '-') {
+		char *arg = *argv;
+		while (*++arg) {
+			switch (*arg) {
+			case 'b':		/* raw binary format */
+				if (fmt++)
+					goto sep_err;
+				sep = '\0';
+				break;
+			case 'c':		/* external checksum format */
+				if (fmt++)
+					goto sep_err;
+				sep = '\0';
+				chk = 1;
+				break;
+			case 't':		/* text format */
+				if (fmt++)
+					goto sep_err;
+				sep = '\n';
+				break;
+			default:
+				cmd_usage(cmdtp);
+				return 1;
+			}
+		}
+	}
+
+	if (argc < 1) {
+		cmd_usage(cmdtp);
+		return 1;
+	}
+
+	addr = (char *)simple_strtoul(argv[0], NULL, 16);
+
+	if (argc == 2) {
+		size = simple_strtoul(argv[1], NULL, 16);
+		memset(addr, '\0', size);
+	} else {
+		size = 0;
+	}
+
+	if (sep) {		/* export as text file */
+		len = hexport(sep, &addr, size);
+		if (len < 0) {
+			error("Cannot export environment: errno = %d\n",
+				errno);
+			return 1;
+		}
+		sprintf(buf, "%zX", len);
+		setenv("filesize", buf);
+
+		return 0;
+	}
+
+	envp = (env_t *)addr;
+
+	if (chk)		/* export as checksum protected block */
+		res = (char *)envp->data;
+	else			/* export as raw binary data */
+		res = addr;
+
+	len = hexport('\0', &res, ENV_SIZE);
+	if (len < 0) {
+		error("Cannot export environment: errno = %d\n",
+			errno);
+		return 1;
+	}
+
+	if (chk) {
+		envp->crc   = crc32(0, envp->data, ENV_SIZE);
+#ifdef CONFIG_ENV_ADDR_REDUND
+		envp->flags = ACTIVE_FLAG;
+#endif
+	}
+	sprintf(buf, "%zX", len + offsetof(env_t,data));
+	setenv("filesize", buf);
+
+	return 0;
+
+sep_err:
+	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
+		cmd);
+	return 1;
+}
+
+/*
+ * env import [-d] [-t | -b | -c] addr [size]
+ *	-d:	delete existing environment before importing;
+ *		otherwise overwrite / append to existion definitions
+ *	-t:	assume text format; either "size" must be given or the
+ *		text data must be '\0' terminated
+ *	-b:	assume binary format ('\0' separated, "\0\0" terminated)
+ *	-c:	assume checksum protected environment format
+ *	addr:	memory address to read from
+ *	size:	length of input data; if missing, proper '\0'
+ *		termination is mandatory
+ */
+static int do_env_import(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
+{
+	char	*cmd, *addr;
+	char	sep = '\n';
+	int	chk = 0;
+	int	fmt = 0;
+	int	del = 0;
+	size_t	size;
+
+	cmd = *argv;
+
+	while (--argc > 0 && **++argv == '-') {
+		char *arg = *argv;
+		while (*++arg) {
+			switch (*arg) {
+			case 'b':		/* raw binary format */
+				if (fmt++)
+					goto sep_err;
+				sep = '\0';
+				break;
+			case 'c':		/* external checksum format */
+				if (fmt++)
+					goto sep_err;
+				sep = '\0';
+				chk = 1;
+				break;
+			case 't':		/* text format */
+				if (fmt++)
+					goto sep_err;
+				sep = '\n';
+				break;
+			case 'd':
+				del = 1;
+				break;
+			default:
+				cmd_usage(cmdtp);
+				return 1;
+			}
+		}
+	}
+
+	if (argc < 1) {
+		cmd_usage(cmdtp);
+		return 1;
+	}
+
+	if (!fmt)
+		printf("## Warning: defaulting to text format\n");
+
+	addr = (char *)simple_strtoul(argv[0], NULL, 16);
+
+	if (argc == 2) {
+		size = simple_strtoul(argv[1], NULL, 16);
+	} else {
+		char *s = addr;
+
+		size = 0;
+
+		while (size < MAX_ENV_SIZE) {
+			if ((*s == sep) && (*(s+1) == '\0'))
+				break;
+			++s;
+			++size;
+		}
+		if (size == MAX_ENV_SIZE) {
+			printf("## Warning: Input data exceeds %d bytes"
+				" - truncated\n", MAX_ENV_SIZE);
+		}
+		++size;
+		printf("## Info: input data size = %zd = 0x%zX\n", size, size);
+	}
+
+	if (chk) {
+		uint32_t crc;
+		env_t *ep = (env_t *)addr;
+
+		size -= offsetof(env_t, data);
+		memcpy(&crc, &ep->crc, sizeof(crc));
+
+		if (crc32(0, ep->data, size) != crc) {
+			puts("## Error: bad CRC, import failed\n");
+			return 1;
+		}
+		addr = (char *)ep->data;
+	}
+
+	if (himport(addr, size, sep, del ? 0 : H_NOCLEAR) == 0) {
+		error("Environment import failed: errno = %d\n", errno);
+		return 1;
+	}
+	gd->flags |= GD_FLG_ENV_READY;
+
+	return 0;
+
+sep_err:
+	printf("## %s: only one of \"-b\", \"-c\" or \"-t\" allowed\n",
+		cmd);
+	return 1;
+}
+
+#if defined(CONFIG_CMD_RUN)
+extern int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
+#endif
+
+/*
+ * New command line interface: "env" command with subcommands
+ */
+static cmd_tbl_t cmd_env_sub[] = {
+#if defined(CONFIG_CMD_ASKENV)
+	U_BOOT_CMD_MKENT(ask, CONFIG_SYS_MAXARGS, 1, do_env_ask, "", ""),
+#endif
+	U_BOOT_CMD_MKENT(default, 1, 0, do_env_default, "", ""),
+	U_BOOT_CMD_MKENT(delete, 2, 0, do_env_delete, "", ""),
+#if defined(CONFIG_CMD_EDITENV)
+	U_BOOT_CMD_MKENT(edit, 2, 0, do_env_edit, "", ""),
+#endif
+	U_BOOT_CMD_MKENT(export, 4, 0, do_env_export, "", ""),
+	U_BOOT_CMD_MKENT(import, 5, 0, do_env_import, "", ""),
+	U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
+#if defined(CONFIG_CMD_RUN)
+	U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
+#endif
+#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
+	U_BOOT_CMD_MKENT(save, 1, 0, do_env_save, "", ""),
+#endif
+	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 0, do_env_set, "", ""),
+};
+
+static int do_env (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	cmd_tbl_t *cp;
+
+	/* drop initial "env" arg */
+	argc--;
+	argv++;
+
+	cp = find_cmd_tbl(argv[0], cmd_env_sub, ARRAY_SIZE(cmd_env_sub));
+
+	if (cp)
+		return cp->cmd(cmdtp, flag, argc, argv);
+
+	cmd_usage(cmdtp);
+	return 1;
+}
+
+U_BOOT_CMD(
+	env, CONFIG_SYS_MAXARGS, 1, do_env,
+	"environment handling commands",
+#if defined(CONFIG_CMD_ASKENV)
+	"ask name [message] [size] - ask for environment variable\nenv "
+#endif
+	"default -f - reset default environment\n"
+#if defined(CONFIG_CMD_EDITENV)
+	"env edit name - edit environment variable\n"
+#endif
+	"env export [-t | -b | -c] addr [size] - export environmnt\n"
+	"env import [-d] [-t | -b | -c] addr [size] - import environmnt\n"
+	"env print [name ...] - print environment\n"
+#if defined(CONFIG_CMD_RUN)
+	"env run var [...] - run commands in an environment variable\n"
+#endif
+	"env save - save environment\n"
+	"env set [-f] name [arg ...]\n"
+);
+
+/*
+ * Old command line interface, kept for compatibility
+ */
 
-/**************************************************/
+#if defined(CONFIG_CMD_EDITENV)
+U_BOOT_CMD(
+	editenv, 2, 0,	do_env_edit,
+	"edit environment variable",
+	"name\n"
+	"    - edit environment variable 'name'"
+);
+#endif
 
 U_BOOT_CMD(
-	printenv, CFG_MAXARGS, 1,	do_printenv,
-	"printenv- print environment variables\n",
+	printenv, CONFIG_SYS_MAXARGS, 1,	do_env_print,
+	"print environment variables",
 	"\n    - print values of all environment variables\n"
 	"printenv name ...\n"
-	"    - print value of environment variable 'name'\n"
+	"    - print value of environment variable 'name'"
 );
 
 U_BOOT_CMD(
-	setenv, CFG_MAXARGS, 0,	do_setenv,
-	"setenv  - set environment variables\n",
+	setenv, CONFIG_SYS_MAXARGS, 0,	do_env_set,
+	"set environment variables",
 	"name value ...\n"
 	"    - set environment variable 'name' to 'value ...'\n"
 	"setenv name\n"
-	"    - delete environment variable 'name'\n"
-);
-
-#if ((defined(CFG_ENV_IS_IN_NVRAM) || defined(CFG_ENV_IS_IN_EEPROM) \
-    || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_FLASH)) \
-    || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)) \
-    || (defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_ONENAND))) \
-    && !defined(CFG_ENV_IS_NOWHERE))
-U_BOOT_CMD(
-	saveenv, 1, 0,	do_saveenv,
-	"saveenv - save environment variables to persistent storage\n",
-	NULL
+	"    - delete environment variable 'name'"
 );
 
-#endif
-
 #if defined(CONFIG_CMD_ASKENV)
 
 U_BOOT_CMD(
-	askenv,	CFG_MAXARGS,	1,	do_askenv,
-	"askenv  - get environment variables from stdin\n",
+	askenv,	CONFIG_SYS_MAXARGS,	1,	do_env_ask,
+	"get environment variables from stdin",
 	"name [message] [size]\n"
 	"    - get environment variable 'name' from stdin (max 'size' chars)\n"
 	"askenv name\n"
@@ -621,16 +917,15 @@ U_BOOT_CMD(
 	"    - get environment variable 'name' from stdin (max 'size' chars)\n"
 	"askenv name [message] size\n"
 	"    - display 'message' string and get environment variable 'name'"
-	"from stdin (max 'size' chars)\n"
+	"from stdin (max 'size' chars)"
 );
 #endif
 
 #if defined(CONFIG_CMD_RUN)
-int do_run (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 U_BOOT_CMD(
-	run,	CFG_MAXARGS,	1,	do_run,
-	"run     - run commands in an environment variable\n",
+	run,	CONFIG_SYS_MAXARGS,	1,	do_run,
+	"run commands in an environment variable",
 	"var [...]\n"
-	"    - run the commands in the environment variable(s) 'var'\n"
+	"    - run the commands in the environment variable(s) 'var'"
 );
 #endif