projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| c609719b WD |
1 | /* |
| 2 | * (C) Copyright 2002 | |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
| 4 | * | |
| 5 | * See file CREDITS for list of people who contributed to this | |
| 6 | * project. | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or | |
| 9 | * modify it under the terms of the GNU General Public License as | |
| 10 | * published by the Free Software Foundation; either version 2 of | |
| 11 | * the License, or (at your option) any later version. | |
| 12 | * | |
| 13 | * This program is distributed in the hope that it will be useful, | |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | * GNU General Public License for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU General Public License | |
| 19 | * along with this program; if not, write to the Free Software | |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 21 | * MA 02111-1307 USA | |
| 22 | */ | |
| 23 | ||
| 24 | #ifndef _ENVIRONMENT_H_ | |
| 25 | #define _ENVIRONMENT_H_ 1 | |
| 26 | ||
| 27 | /************************************************************************** | |
| 28 | * | |
| 29 | * The "environment" is stored as a list of '\0' terminated | |
| 30 | * "name=value" strings. The end of the list is marked by a double | |
| 31 | * '\0'. New entries are always added at the end. Deleting an entry | |
| 32 | * shifts the remaining entries to the front. Replacing an entry is a | |
| 33 | * combination of deleting the old value and adding the new one. | |
| 34 | * | |
| 35 | * The environment is preceeded by a 32 bit CRC over the data part. | |
| 36 | * | |
| 37 | ************************************************************************** | |
| 38 | */ | |
| 39 | ||
| 40 | #if defined(CFG_ENV_IS_IN_FLASH) | |
| 41 | # ifndef CFG_ENV_ADDR | |
| 42 | # define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET) | |
| 43 | # endif | |
| 44 | # ifndef CFG_ENV_OFFSET | |
| 45 | # define CFG_ENV_OFFSET (CFG_ENV_ADDR - CFG_FLASH_BASE) | |
| 46 | # endif | |
| 47 | # if !defined(CFG_ENV_ADDR_REDUND) && defined(CFG_ENV_OFFSET_REDUND) | |
| 48 | # define CFG_ENV_ADDR_REDUND (CFG_FLASH_BASE + CFG_ENV_OFFSET_REDUND) | |
| 49 | # endif | |
| 50 | # ifndef CFG_ENV_SIZE | |
| 51 | # define CFG_ENV_SIZE CFG_ENV_SECT_SIZE | |
| 52 | # endif | |
| 53 | # if defined(CFG_ENV_ADDR_REDUND) && !defined(CFG_ENV_SIZE_REDUND) | |
| 54 | # define CFG_ENV_SIZE_REDUND CFG_ENV_SIZE | |
| 55 | # endif | |
| 56 | # if (CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \ | |
| 57 | (CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN) | |
| 58 | # define ENV_IS_EMBEDDED 1 | |
| 59 | # endif | |
| 60 | # if defined(CFG_ENV_ADDR_REDUND) || defined(CFG_ENV_OFFSET_REDUND) | |
| 61 | # define CFG_REDUNDAND_ENVIRONMENT 1 | |
| 62 | # endif | |
| 63 | #endif /* CFG_ENV_IS_IN_FLASH */ | |
| 64 | ||
| 65 | ||
| 66 | #ifdef CFG_REDUNDAND_ENVIRONMENT | |
| 67 | # define ENV_HEADER_SIZE (sizeof(unsigned long) + 1) | |
| 68 | #else | |
| 69 | # define ENV_HEADER_SIZE (sizeof(unsigned long)) | |
| 70 | #endif | |
| 71 | ||
| 72 | ||
| 73 | #define ENV_SIZE (CFG_ENV_SIZE - ENV_HEADER_SIZE) | |
| 74 | ||
| 75 | typedef struct environment_s { | |
| 76 | unsigned long crc; /* CRC32 over data bytes */ | |
| 77 | #ifdef CFG_REDUNDAND_ENVIRONMENT | |
| 78 | unsigned char flags; /* active/obsolete flags */ | |
| 79 | #endif | |
| 80 | unsigned char data[ENV_SIZE]; /* Environment data */ | |
| 81 | } env_t; | |
| 82 | ||
| 83 | #endif /* _ENVIRONMENT_H_ */ |