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git.ipfire.org Git - thirdparty/u-boot.git/blob - env/nvram.c
1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2000-2010
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7 * Andreas Heppel <aheppel@sysgo.de>
11 * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
13 * It might not be possible in all cases to use 'memcpy()' to copy
14 * the environment to NVRAM, as the NVRAM might not be mapped into
15 * the memory space. (I.e. this is the case for the BAB750). In those
16 * cases it might be possible to access the NVRAM using a different
17 * method. For example, the RTC on the BAB750 is accessible in IO
18 * space using its address and data registers. To enable usage of
19 * NVRAM in those cases I invented the functions 'nvram_read()' and
20 * 'nvram_write()', which will be activated upon the configuration
21 * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
22 * strongly dependent on the used HW, and must be redefined for each
23 * board that wants to use them.
28 #include <environment.h>
29 #include <linux/stddef.h>
33 DECLARE_GLOBAL_DATA_PTR
;
35 #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
36 extern void *nvram_read(void *dest
, const long src
, size_t count
);
37 extern void nvram_write(long dest
, const void *src
, size_t count
);
39 env_t
*env_ptr
= (env_t
*)CONFIG_ENV_ADDR
;
42 #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
43 /** Call this function from overridden env_get_char_spec() if you need
46 int env_nvram_get_char(int index
)
50 nvram_read(&c
, CONFIG_ENV_ADDR
+ index
, 1);
56 static int env_nvram_load(void)
58 char buf
[CONFIG_ENV_SIZE
];
60 #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
61 nvram_read(buf
, CONFIG_ENV_ADDR
, CONFIG_ENV_SIZE
);
63 memcpy(buf
, (void *)CONFIG_ENV_ADDR
, CONFIG_ENV_SIZE
);
65 return env_import(buf
, 1);
68 static int env_nvram_save(void)
73 rcode
= env_export(&env_new
);
77 #ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
78 nvram_write(CONFIG_ENV_ADDR
, &env_new
, CONFIG_ENV_SIZE
);
80 if (memcpy((char *)CONFIG_ENV_ADDR
, &env_new
, CONFIG_ENV_SIZE
) == NULL
)
87 * Initialize Environment use
89 * We are still running from ROM, so data use is limited
91 static int env_nvram_init(void)
93 #if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
97 nvram_read(&crc
, CONFIG_ENV_ADDR
, sizeof(ulong
));
98 nvram_read(data
, CONFIG_ENV_ADDR
+ sizeof(ulong
), ENV_SIZE
);
100 if (crc32(0, data
, ENV_SIZE
) == crc
) {
101 gd
->env_addr
= (ulong
)CONFIG_ENV_ADDR
+ sizeof(long);
103 if (crc32(0, env_ptr
->data
, ENV_SIZE
) == env_ptr
->crc
) {
104 gd
->env_addr
= (ulong
)&env_ptr
->data
;
106 gd
->env_valid
= ENV_VALID
;
108 gd
->env_addr
= (ulong
)&default_environment
[0];
109 gd
->env_valid
= ENV_INVALID
;
115 U_BOOT_ENV_LOCATION(nvram
) = {
116 .location
= ENVL_NVRAM
,
118 .load
= env_nvram_load
,
119 .save
= env_save_ptr(env_nvram_save
),
120 .init
= env_nvram_init
,