3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
24 #ifndef _ENVIRONMENT_H_
25 #define _ENVIRONMENT_H_ 1
27 /**************************************************************************
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.
35 * The environment is preceeded by a 32 bit CRC over the data part.
37 **************************************************************************
40 #if defined(CONFIG_ENV_IS_IN_FLASH)
41 # ifndef CONFIG_ENV_ADDR
42 # define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
44 # ifndef CONFIG_ENV_OFFSET
45 # define CONFIG_ENV_OFFSET (CONFIG_ENV_ADDR - CONFIG_SYS_FLASH_BASE)
47 # if !defined(CONFIG_ENV_ADDR_REDUND) && defined(CONFIG_ENV_OFFSET_REDUND)
48 # define CONFIG_ENV_ADDR_REDUND (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
50 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
51 # ifndef CONFIG_ENV_SECT_SIZE
52 # define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
54 # ifndef CONFIG_ENV_SIZE
55 # define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
58 # error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
60 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
61 # define CONFIG_ENV_SIZE_REDUND CONFIG_ENV_SIZE
63 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
64 (CONFIG_ENV_ADDR+CONFIG_ENV_SIZE) <= (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
65 # define ENV_IS_EMBEDDED 1
67 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
68 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT 1
70 # ifdef CONFIG_ENV_IS_EMBEDDED
71 # error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
72 # error "it is calculated automatically for you"
74 #endif /* CONFIG_ENV_IS_IN_FLASH */
76 #if defined(CONFIG_ENV_IS_IN_NAND)
77 # if defined(CONFIG_ENV_OFFSET_OOB)
78 # ifdef CONFIG_ENV_OFFSET_REDUND
79 # error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
82 extern unsigned long nand_env_oob_offset;
83 # define CONFIG_ENV_OFFSET nand_env_oob_offset
85 # ifndef CONFIG_ENV_OFFSET
86 # error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
88 # ifdef CONFIG_ENV_OFFSET_REDUND
89 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
91 # endif /* CONFIG_ENV_OFFSET_OOB */
92 # ifndef CONFIG_ENV_SIZE
93 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
95 #endif /* CONFIG_ENV_IS_IN_NAND */
97 #if defined(CONFIG_ENV_IS_IN_MG_DISK)
98 # ifndef CONFIG_ENV_ADDR
99 # error "Need to define CONFIG_ENV_ADDR when using CONFIG_ENV_IS_IN_MG_DISK"
101 # ifndef CONFIG_ENV_SIZE
102 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_MG_DISK"
104 #endif /* CONFIG_ENV_IS_IN_MG_DISK */
106 /* Embedded env is only supported for some flash types */
107 #ifdef CONFIG_ENV_IS_EMBEDDED
108 # if !defined(CONFIG_ENV_IS_IN_FLASH) && \
109 !defined(CONFIG_ENV_IS_IN_NAND) && \
110 !defined(CONFIG_ENV_IS_IN_ONENAND) && \
111 !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
112 # error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
117 * For the flash types where embedded env is supported, but it cannot be
118 * calculated automatically (i.e. NAND), take the board opt-in.
120 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
121 # define ENV_IS_EMBEDDED 1
124 /* The build system likes to know if the env is embedded */
126 # ifdef ENV_IS_EMBEDDED
127 # ifndef CONFIG_ENV_IS_EMBEDDED
128 # define CONFIG_ENV_IS_EMBEDDED
133 #include "compiler.h"
135 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
136 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
138 # define ACTIVE_FLAG 1
139 # define OBSOLETE_FLAG 0
141 # define ENV_HEADER_SIZE (sizeof(uint32_t))
145 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
147 typedef struct environment_s {
148 uint32_t crc; /* CRC32 over data bytes */
149 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
150 unsigned char flags; /* active/obsolete flags */
152 unsigned char data[ENV_SIZE]; /* Environment data */
159 extern struct hsearch_data env_htab;
161 /* Function that returns a character from the environment */
162 unsigned char env_get_char (int);
164 /* Function that returns a pointer to a value from the environment */
165 const unsigned char *env_get_addr(int);
166 unsigned char env_get_char_memory (int index);
168 /* Function that updates CRC of the enironment */
169 void env_crc_update (void);
171 /* [re]set to the default environment */
172 void set_default_env(const char *s);
174 /* Import from binary representation into hash table */
175 int env_import(const char *buf, int check);
179 #endif /* _ENVIRONMENT_H_ */