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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 | |
500545cc WD |
50 | # if defined(CFG_ENV_SECT_SIZE) || defined(CFG_ENV_SIZE) |
51 | # ifndef CFG_ENV_SECT_SIZE | |
52 | # define CFG_ENV_SECT_SIZE CFG_ENV_SIZE | |
53 | # endif | |
54 | # ifndef CFG_ENV_SIZE | |
55 | # define CFG_ENV_SIZE CFG_ENV_SECT_SIZE | |
56 | # endif | |
57 | # else | |
58 | # error "Both CFG_ENV_SECT_SIZE and CFG_ENV_SIZE undefined" | |
c609719b WD |
59 | # endif |
60 | # if defined(CFG_ENV_ADDR_REDUND) && !defined(CFG_ENV_SIZE_REDUND) | |
61 | # define CFG_ENV_SIZE_REDUND CFG_ENV_SIZE | |
62 | # endif | |
63 | # if (CFG_ENV_ADDR >= CFG_MONITOR_BASE) && \ | |
64 | (CFG_ENV_ADDR+CFG_ENV_SIZE) <= (CFG_MONITOR_BASE + CFG_MONITOR_LEN) | |
65 | # define ENV_IS_EMBEDDED 1 | |
66 | # endif | |
67 | # if defined(CFG_ENV_ADDR_REDUND) || defined(CFG_ENV_OFFSET_REDUND) | |
68 | # define CFG_REDUNDAND_ENVIRONMENT 1 | |
69 | # endif | |
70 | #endif /* CFG_ENV_IS_IN_FLASH */ | |
71 | ||
e443c944 MK |
72 | #if defined(CFG_ENV_IS_IN_NAND) |
73 | # ifndef CFG_ENV_OFFSET | |
74 | # error "Need to define CFG_ENV_OFFSET when using CFG_ENV_IS_IN_NAND" | |
75 | # endif | |
76 | # ifndef CFG_ENV_SIZE | |
77 | # error "Need to define CFG_ENV_SIZE when using CFG_ENV_IS_IN_NAND" | |
78 | # endif | |
79 | # ifdef CFG_ENV_OFFSET_REDUND | |
80 | # define CFG_REDUNDAND_ENVIRONMENT | |
81 | # endif | |
d1a72545 | 82 | # ifdef CFG_ENV_IS_EMBEDDED |
d12ae808 SR |
83 | # define ENV_IS_EMBEDDED 1 |
84 | # endif | |
e443c944 MK |
85 | #endif /* CFG_ENV_IS_IN_NAND */ |
86 | ||
c609719b WD |
87 | |
88 | #ifdef CFG_REDUNDAND_ENVIRONMENT | |
89 | # define ENV_HEADER_SIZE (sizeof(unsigned long) + 1) | |
90 | #else | |
91 | # define ENV_HEADER_SIZE (sizeof(unsigned long)) | |
92 | #endif | |
93 | ||
94 | ||
95 | #define ENV_SIZE (CFG_ENV_SIZE - ENV_HEADER_SIZE) | |
96 | ||
97 | typedef struct environment_s { | |
98 | unsigned long crc; /* CRC32 over data bytes */ | |
99 | #ifdef CFG_REDUNDAND_ENVIRONMENT | |
100 | unsigned char flags; /* active/obsolete flags */ | |
101 | #endif | |
102 | unsigned char data[ENV_SIZE]; /* Environment data */ | |
103 | } env_t; | |
104 | ||
105 | #endif /* _ENVIRONMENT_H_ */ |