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+/*
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+ * (C) Copyright 2000-2002
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+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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+ *
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+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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+ * Andreas Heppel <aheppel@sysgo.de>
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+
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+ * See file CREDITS for list of people who contributed to this
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+ * project.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of
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+ * the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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+ * MA 02111-1307 USA
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+ */
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+
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+#include <common.h>
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+
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+#if defined(CFG_ENV_IS_IN_EEPROM) /* Environment is in EEPROM */
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+
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+#include <command.h>
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+#include <environment.h>
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+#include <cmd_nvedit.h>
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+#include <linux/stddef.h>
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+#include <malloc.h>
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+
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+env_t *env_ptr = NULL;
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+
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+char * env_name_spec = "EEPROM";
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+
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+extern uchar (*env_get_char)(int);
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+extern uchar env_get_char_memory (int index);
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+
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+
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+uchar env_get_char_spec (int index)
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+{
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+ uchar c;
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+
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+ eeprom_read (CFG_DEF_EEPROM_ADDR,
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+ CFG_ENV_OFFSET+index+offsetof(env_t,data),
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+ &c, 1);
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+
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+ return (c);
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+}
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+
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+void env_relocate_spec (void)
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+{
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+ eeprom_read (CFG_DEF_EEPROM_ADDR,
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+ CFG_ENV_OFFSET,
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+ (uchar*)env_ptr,
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+ CFG_ENV_SIZE);
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+}
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+
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+int saveenv(void)
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+{
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+ return eeprom_write (CFG_DEF_EEPROM_ADDR,
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+ CFG_ENV_OFFSET,
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+ (uchar *)env_ptr,
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+ CFG_ENV_SIZE);
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+}
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+
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+/************************************************************************
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+ * Initialize Environment use
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+ *
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+ * We are still running from ROM, so data use is limited
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+ * Use a (moderately small) buffer on the stack
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+ */
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+int env_init(void)
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+{
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+ DECLARE_GLOBAL_DATA_PTR;
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+
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+ ulong crc, len, new;
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+ unsigned off;
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+ uchar buf[64];
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+
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+ eeprom_init (); /* prepare for EEPROM read/write */
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+
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+ /* read old CRC */
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+ eeprom_read (CFG_DEF_EEPROM_ADDR,
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+ CFG_ENV_OFFSET+offsetof(env_t,crc),
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+ (uchar *)&crc, sizeof(ulong));
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+
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+ new = 0;
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+ len = ENV_SIZE;
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+ off = offsetof(env_t,data);
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+ while (len > 0) {
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+ int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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+
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+ eeprom_read (CFG_DEF_EEPROM_ADDR, CFG_ENV_OFFSET+off, buf, n);
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+ new = crc32 (new, buf, n);
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+ len -= n;
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+ off += n;
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+ }
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+
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+ if (crc == new) {
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+ gd->env_addr = offsetof(env_t,data);
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+ gd->env_valid = 1;
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+ } else {
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+ gd->env_addr = 0;
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+ gd->env_valid = 0;
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+ }
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+
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+ return (0);
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+}
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+
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+#endif /* CFG_ENV_IS_IN_EEPROM */
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wdenk