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_
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 \
49 (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET_REDUND)
51 # if defined(CONFIG_ENV_SECT_SIZE) || defined(CONFIG_ENV_SIZE)
52 # ifndef CONFIG_ENV_SECT_SIZE
53 # define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
55 # ifndef CONFIG_ENV_SIZE
56 # define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
59 # error "Both CONFIG_ENV_SECT_SIZE and CONFIG_ENV_SIZE undefined"
61 # if defined(CONFIG_ENV_ADDR_REDUND) && !defined(CONFIG_ENV_SIZE_REDUND)
62 # define CONFIG_ENV_SIZE_REDUND CONFIG_ENV_SIZE
64 # if (CONFIG_ENV_ADDR >= CONFIG_SYS_MONITOR_BASE) && \
65 (CONFIG_ENV_ADDR + CONFIG_ENV_SIZE) <= \
66 (CONFIG_SYS_MONITOR_BASE + CONFIG_SYS_MONITOR_LEN)
67 # define ENV_IS_EMBEDDED
69 # if defined(CONFIG_ENV_ADDR_REDUND) || defined(CONFIG_ENV_OFFSET_REDUND)
70 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
72 # ifdef CONFIG_ENV_IS_EMBEDDED
73 # error "do not define CONFIG_ENV_IS_EMBEDDED in your board config"
74 # error "it is calculated automatically for you"
76 #endif /* CONFIG_ENV_IS_IN_FLASH */
78 #if defined(CONFIG_ENV_IS_IN_NAND)
79 # if defined(CONFIG_ENV_OFFSET_OOB)
80 # ifdef CONFIG_ENV_OFFSET_REDUND
81 # error "CONFIG_ENV_OFFSET_REDUND is not supported when CONFIG_ENV_OFFSET_OOB"
84 extern unsigned long nand_env_oob_offset;
85 # define CONFIG_ENV_OFFSET nand_env_oob_offset
87 # ifndef CONFIG_ENV_OFFSET
88 # error "Need to define CONFIG_ENV_OFFSET when using CONFIG_ENV_IS_IN_NAND"
90 # ifdef CONFIG_ENV_OFFSET_REDUND
91 # define CONFIG_SYS_REDUNDAND_ENVIRONMENT
93 # endif /* CONFIG_ENV_OFFSET_OOB */
94 # ifndef CONFIG_ENV_SIZE
95 # error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_NAND"
97 #endif /* CONFIG_ENV_IS_IN_NAND */
99 /* Embedded env is only supported for some flash types */
100 #ifdef CONFIG_ENV_IS_EMBEDDED
101 # if !defined(CONFIG_ENV_IS_IN_FLASH) && \
102 !defined(CONFIG_ENV_IS_IN_NAND) && \
103 !defined(CONFIG_ENV_IS_IN_ONENAND) && \
104 !defined(CONFIG_ENV_IS_IN_SPI_FLASH)
105 # error "CONFIG_ENV_IS_EMBEDDED not supported for your flash type"
110 * For the flash types where embedded env is supported, but it cannot be
111 * calculated automatically (i.e. NAND), take the board opt-in.
113 #if defined(CONFIG_ENV_IS_EMBEDDED) && !defined(ENV_IS_EMBEDDED)
114 # define ENV_IS_EMBEDDED
117 /* The build system likes to know if the env is embedded */
119 # ifdef ENV_IS_EMBEDDED
120 # ifndef CONFIG_ENV_IS_EMBEDDED
121 # define CONFIG_ENV_IS_EMBEDDED
126 #include "compiler.h"
128 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
129 # define ENV_HEADER_SIZE (sizeof(uint32_t) + 1)
131 # define ACTIVE_FLAG 1
132 # define OBSOLETE_FLAG 0
134 # define ENV_HEADER_SIZE (sizeof(uint32_t))
137 #if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
138 extern char *env_name_spec;
141 #define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
143 typedef struct environment_s {
144 uint32_t crc; /* CRC32 over data bytes */
145 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
146 unsigned char flags; /* active/obsolete flags */
148 unsigned char data[ENV_SIZE]; /* Environment data */
151 #ifdef ENV_IS_EMBEDDED
152 extern env_t environment;
153 #endif /* ENV_IS_EMBEDDED */
155 extern const unsigned char default_environment[];
156 extern env_t *env_ptr;
158 extern void env_relocate_spec(void);
159 extern unsigned char env_get_char_spec(int);
161 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
162 extern void env_reloc(void);
169 extern struct hsearch_data env_htab;
171 /* Function that returns a character from the environment */
172 unsigned char env_get_char(int);
174 /* Function that returns a pointer to a value from the environment */
175 const unsigned char *env_get_addr(int);
176 unsigned char env_get_char_memory(int index);
178 /* Function that updates CRC of the enironment */
179 void env_crc_update(void);
181 /* [re]set to the default environment */
182 void set_default_env(const char *s);
184 /* Import from binary representation into hash table */
185 int env_import(const char *buf, int check);
187 #endif /* DO_DEPS_ONLY */
189 #endif /* _ENVIRONMENT_H_ */