]>
git.ipfire.org Git - people/ms/u-boot.git/blob - env/dataflash.c
2 * LowLevel function for DataFlash environment support
3 * Author : Gilles Gastaldi (Atmel)
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <environment.h>
10 #include <linux/stddef.h>
11 #include <dataflash.h>
15 DECLARE_GLOBAL_DATA_PTR
;
19 static unsigned char env_dataflash_get_char(int index
)
23 read_dataflash(CONFIG_ENV_ADDR
+ index
+ offsetof(env_t
, data
),
28 static void env_dataflash_load(void)
32 char buf
[CONFIG_ENV_SIZE
];
35 read_dataflash(CONFIG_ENV_ADDR
+ offsetof(env_t
, crc
),
36 sizeof(ulong
), (char *)&crc
);
38 /* Read whole environment */
39 read_dataflash(CONFIG_ENV_ADDR
, CONFIG_ENV_SIZE
, buf
);
41 /* Calculate the CRC */
42 off
= offsetof(env_t
, data
);
43 new = crc32(new, (unsigned char *)(buf
+ off
), ENV_SIZE
);
48 set_default_env("!bad CRC");
51 #ifdef CONFIG_ENV_OFFSET_REDUND
52 #error No support for redundant environment on dataflash yet!
55 static int env_dataflash_save(void)
60 ret
= env_export(&env_new
);
64 return write_dataflash(CONFIG_ENV_ADDR
,
65 (unsigned long)&env_new
,
69 U_BOOT_ENV_LOCATION(dataflash
) = {
70 .location
= ENVL_DATAFLASH
,
72 .get_char
= env_dataflash_get_char
,
73 .load
= env_dataflash_load
,
74 .save
= env_save_ptr(env_dataflash_save
),