/* * (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 <linux/stddef.h> DECLARE_GLOBAL_DATA_PTR; 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) { 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 */