1 files changed, 116 insertions, 0 deletions
diff --git a/common/env_eeprom.c b/common/env_eeprom.c
new file mode 100644
index 0000000..9f1d82a
--- /dev/null
+++ b/common/env_eeprom.c
@@ -0,0 +1,116 @@
+/*
+ * (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>
+
+#if defined(CFG_ENV_IS_IN_EEPROM) /* Environment is in EEPROM */
+
+#include <command.h>
+#include <environment.h>
+#include <cmd_nvedit.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+
+env_t *env_ptr = NULL;
+
+char * env_name_spec = "EEPROM";
+
+extern uchar (*env_get_char)(int);
+extern uchar env_get_char_memory (int index);
+
+
+uchar env_get_char_spec (int index)
+{
+	uchar c;
+
+	eeprom_read (CFG_DEF_EEPROM_ADDR,
+		     CFG_ENV_OFFSET+index+offsetof(env_t,data),
+		     &c, 1);
+
+	return (c);
+}
+
+void env_relocate_spec (void)
+{
+	eeprom_read (CFG_DEF_EEPROM_ADDR,
+		     CFG_ENV_OFFSET,
+		     (uchar*)env_ptr,
+		     CFG_ENV_SIZE);
+}
+
+int saveenv(void)
+{
+	return eeprom_write (CFG_DEF_EEPROM_ADDR,
+			     CFG_ENV_OFFSET,
+			     (uchar *)env_ptr,
+			     CFG_ENV_SIZE);
+}
+
+/************************************************************************
+ * Initialize Environment use
+ *
+ * We are still running from ROM, so data use is limited
+ * Use a (moderately small) buffer on the stack
+ */
+int env_init(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	ulong crc, len, new;
+	unsigned off;
+	uchar buf[64];
+
+	eeprom_init ();	/* prepare for EEPROM read/write */
+
+	/* read old CRC */
+	eeprom_read (CFG_DEF_EEPROM_ADDR,
+		     CFG_ENV_OFFSET+offsetof(env_t,crc),
+		     (uchar *)&crc, sizeof(ulong));
+
+	new = 0;
+	len = ENV_SIZE;
+	off = offsetof(env_t,data);
+	while (len > 0) {
+		int n = (len > sizeof(buf)) ? sizeof(buf) : len;
+
+		eeprom_read (CFG_DEF_EEPROM_ADDR, CFG_ENV_OFFSET+off, buf, n);
+		new = crc32 (new, buf, n);
+		len -= n;
+		off += n;
+	}
+
+	if (crc == new) {
+		gd->env_addr  = offsetof(env_t,data);
+		gd->env_valid = 1;
+	} else {
+		gd->env_addr  = 0;
+		gd->env_valid = 0;
+	}
+
+	return (0);
+}
+
+#endif /* CFG_ENV_IS_IN_EEPROM */