1 /* LowLevel function for DataFlash environment support
2 * Author : Gilles Gastaldi (Atmel)
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 #include <environment.h>
23 #include <linux/stddef.h>
24 #include <dataflash.h>
26 DECLARE_GLOBAL_DATA_PTR
;
28 env_t
*env_ptr
= NULL
;
30 char * env_name_spec
= "dataflash";
32 extern int read_dataflash (unsigned long addr
, unsigned long size
, char
34 extern int write_dataflash (unsigned long addr_dest
, unsigned long addr_src
,
36 extern int AT91F_DataflashInit (void);
37 extern uchar default_environment
[];
38 /* extern int default_environment_size; */
41 uchar
env_get_char_spec (int index
)
44 read_dataflash(CONFIG_ENV_ADDR
+ index
+ offsetof(env_t
,data
),
49 void env_relocate_spec (void)
51 read_dataflash(CONFIG_ENV_ADDR
, CONFIG_ENV_SIZE
, (char *)env_ptr
);
56 /* env must be copied to do not alter env structure in memory*/
57 unsigned char temp
[CONFIG_ENV_SIZE
];
58 memcpy(temp
, env_ptr
, CONFIG_ENV_SIZE
);
59 return write_dataflash(CONFIG_ENV_ADDR
, (unsigned long)temp
, CONFIG_ENV_SIZE
);
62 /************************************************************************
63 * Initialize Environment use
65 * We are still running from ROM, so data use is limited
66 * Use a (moderately small) buffer on the stack
73 if (gd
->env_valid
== 0){
74 AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
77 read_dataflash(CONFIG_ENV_ADDR
+ offsetof(env_t
, crc
),
78 sizeof(ulong
), (char *)&crc
);
81 off
= offsetof(env_t
,data
);
83 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
84 read_dataflash(CONFIG_ENV_ADDR
+ off
, n
, (char *)buf
);
85 new = crc32 (new, buf
, n
);
90 gd
->env_addr
= offsetof(env_t
,data
);
93 gd
->env_addr
= (ulong
)&default_environment
[0];