projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 0bc4a1ac WD |
1 | /* |
| 2 | * (C) Copyright 2000-2002 | |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
| 4 | * | |
| 5 | * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
| 6 | * Andreas Heppel <aheppel@sysgo.de> | |
| 7 | ||
| 8 | * See file CREDITS for list of people who contributed to this | |
| 9 | * project. | |
| 10 | * | |
| 11 | * This program is free software; you can redistribute it and/or | |
| 12 | * modify it under the terms of the GNU General Public License as | |
| 13 | * published by the Free Software Foundation; either version 2 of | |
| 14 | * the License, or (at your option) any later version. | |
| 15 | * | |
| 16 | * This program is distributed in the hope that it will be useful, | |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 | * GNU General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU General Public License | |
| 22 | * along with this program; if not, write to the Free Software | |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 24 | * MA 02111-1307 USA | |
| 25 | */ | |
| 26 | ||
| 27 | #include <common.h> | |
| 28 | ||
| 29 | #if defined(CFG_ENV_IS_IN_EEPROM) /* Environment is in EEPROM */ | |
| 30 | ||
| 31 | #include <command.h> | |
| 32 | #include <environment.h> | |
| 0bc4a1ac | 33 | #include <linux/stddef.h> |
| 0bc4a1ac | 34 | |
| d87080b7 WD |
35 | DECLARE_GLOBAL_DATA_PTR; |
| 36 | ||
| 0bc4a1ac WD |
37 | env_t *env_ptr = NULL; |
| 38 | ||
| 39 | char * env_name_spec = "EEPROM"; | |
| 40 | ||
| 0bc4a1ac WD |
41 | uchar env_get_char_spec (int index) |
| 42 | { | |
| 43 | uchar c; | |
| 44 | ||
| 45 | eeprom_read (CFG_DEF_EEPROM_ADDR, | |
| 46 | CFG_ENV_OFFSET+index+offsetof(env_t,data), | |
| 47 | &c, 1); | |
| 48 | ||
| 49 | return (c); | |
| 50 | } | |
| 51 | ||
| 52 | void env_relocate_spec (void) | |
| 53 | { | |
| 54 | eeprom_read (CFG_DEF_EEPROM_ADDR, | |
| 55 | CFG_ENV_OFFSET, | |
| 56 | (uchar*)env_ptr, | |
| 57 | CFG_ENV_SIZE); | |
| 58 | } | |
| 59 | ||
| 60 | int saveenv(void) | |
| 61 | { | |
| 62 | return eeprom_write (CFG_DEF_EEPROM_ADDR, | |
| 63 | CFG_ENV_OFFSET, | |
| 64 | (uchar *)env_ptr, | |
| 65 | CFG_ENV_SIZE); | |
| 66 | } | |
| 67 | ||
| 68 | /************************************************************************ | |
| 69 | * Initialize Environment use | |
| 70 | * | |
| 71 | * We are still running from ROM, so data use is limited | |
| 72 | * Use a (moderately small) buffer on the stack | |
| 73 | */ | |
| 74 | int env_init(void) | |
| 75 | { | |
| 0bc4a1ac WD |
76 | ulong crc, len, new; |
| 77 | unsigned off; | |
| 78 | uchar buf[64]; | |
| 79 | ||
| 80 | eeprom_init (); /* prepare for EEPROM read/write */ | |
| 81 | ||
| 82 | /* read old CRC */ | |
| 83 | eeprom_read (CFG_DEF_EEPROM_ADDR, | |
| 84 | CFG_ENV_OFFSET+offsetof(env_t,crc), | |
| 85 | (uchar *)&crc, sizeof(ulong)); | |
| 86 | ||
| 87 | new = 0; | |
| 88 | len = ENV_SIZE; | |
| 89 | off = offsetof(env_t,data); | |
| 90 | while (len > 0) { | |
| 91 | int n = (len > sizeof(buf)) ? sizeof(buf) : len; | |
| 92 | ||
| 93 | eeprom_read (CFG_DEF_EEPROM_ADDR, CFG_ENV_OFFSET+off, buf, n); | |
| 94 | new = crc32 (new, buf, n); | |
| 95 | len -= n; | |
| 96 | off += n; | |
| 97 | } | |
| 98 | ||
| 99 | if (crc == new) { | |
| 100 | gd->env_addr = offsetof(env_t,data); | |
| 101 | gd->env_valid = 1; | |
| 102 | } else { | |
| 103 | gd->env_addr = 0; | |
| 104 | gd->env_valid = 0; | |
| 105 | } | |
| 106 | ||
| 107 | return (0); | |
| 108 | } | |
| 109 | ||
| 110 | #endif /* CFG_ENV_IS_IN_EEPROM */ |