Initial revision

common/env_common.c

+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <command.h>
+#include <environment.h>
+#include <cmd_nvedit.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+
+#ifdef CONFIG_SHOW_BOOT_PROGRESS
+# include <status_led.h>
+# define SHOW_BOOT_PROGRESS(arg)	show_boot_progress(arg)
+#else
+# define SHOW_BOOT_PROGRESS(arg)
+#endif
+
+#undef DEBUG_ENV
+#ifdef DEBUG_ENV
+#define DEBUGF(fmt,args...) printf(fmt ,##args)
+#else
+#define DEBUGF(fmt,args...)
+#endif
+
+extern env_t *env_ptr;
+
+extern void env_relocate_spec (void);
+extern uchar env_get_char_spec(int);
+
+static uchar env_get_char_init (int index);
+uchar (*env_get_char)(int) = env_get_char_init;
+
+/************************************************************************
+ * Default settings to be used when no valid environment is found
+ */
+#define XMK_STR(x)	#x
+#define MK_STR(x)	XMK_STR(x)
+
+uchar default_environment[] = {
+#ifdef	CONFIG_BOOTARGS
+	"bootargs="	CONFIG_BOOTARGS			"\0"
+#endif
+#ifdef	CONFIG_BOOTCOMMAND
+	"bootcmd="	CONFIG_BOOTCOMMAND		"\0"
+#endif
+#ifdef	CONFIG_RAMBOOTCOMMAND
+	"ramboot="	CONFIG_RAMBOOTCOMMAND		"\0"
+#endif
+#ifdef	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_IPADDR
+	"ipaddr="	MK_STR(CONFIG_IPADDR)		"\0"
+#endif
+#ifdef	CONFIG_SERVERIP
+	"serverip="	MK_STR(CONFIG_SERVERIP)		"\0"
+#endif
+#ifdef	CFG_AUTOLOAD
+	"autoload="	CFG_AUTOLOAD			"\0"
+#endif
+#ifdef	CONFIG_PREBOOT
+	"preboot="	CONFIG_PREBOOT			"\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_CLOCKS_IN_MHZ
+	"clocks_in_mhz=1\0"
+#endif
+#ifdef  CONFIG_EXTRA_ENV_SETTINGS
+	CONFIG_EXTRA_ENV_SETTINGS
+#endif
+	"\0"
+};
+
+
+void env_crc_update (void)
+{
+	env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
+}
+
+static uchar env_get_char_init (int index)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	uchar c;
+
+	/* if crc was bad, use the default environment */
+	if (gd->env_valid)
+	{
+		c = env_get_char_spec(index);
+	} else {
+		c = default_environment[index];
+	}
+
+	return (c);
+}
+
+uchar env_get_char_memory (int index)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	if (gd->env_valid) {
+		return ( *((uchar *)(gd->env_addr + index)) );
+	} else {
+		return ( default_environment[index] );
+	}
+}
+
+uchar *env_get_addr (int index)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	if (gd->env_valid) {
+		return ( ((uchar *)(gd->env_addr + index)) );
+	} else {
+		return (&default_environment[index]);
+	}
+}
+
+void env_relocate (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
+		gd->reloc_off);
+
+#ifdef ENV_IS_EMBEDDED
+	/*
+	 * The environment buffer is embedded with the text segment,
+	 * just relocate the environment pointer
+	 */
+	env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
+	DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
+#else
+	/*
+	 * We must allocate a buffer for the environment
+	 */
+	env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
+	DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
+#endif
+
+	/*
+	 * After relocation to RAM, we can always use the "memory" functions
+	 */
+	env_get_char = env_get_char_memory;
+
+	if (gd->env_valid == 0) {
+#if defined(CONFIG_GTH)	|| defined(CFG_ENV_IS_NOWHERE)	/* Environment not changable */
+		puts ("Using default environment\n\n");
+#else
+		puts ("*** Warning - bad CRC, using default environment\n\n");
+		SHOW_BOOT_PROGRESS (-1);
+#endif
+
+		if (sizeof(default_environment) > ENV_SIZE)
+		{
+			puts ("*** Error - default environment is too large\n\n");
+			return;
+		}
+
+		memset (env_ptr, 0, sizeof(env_t));
+		memcpy (env_ptr->data,
+			default_environment,
+			sizeof(default_environment));
+#ifdef CFG_REDUNDAND_ENVIRONMENT
+		env_ptr->flags = 0xFF;
+#endif
+		env_crc_update ();
+		gd->env_valid = 1;
+	}
+	else {
+		env_relocate_spec ();
+	}
+	gd->env_addr = (ulong)&(env_ptr->data);
+}