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 #if defined(CFG_ENV_IS_IN_DATAFLASH) /* Environment is in DataFlash */
25 #include <environment.h>
26 #include <linux/stddef.h>
27 #include <dataflash.h>
29 DECLARE_GLOBAL_DATA_PTR
;
31 env_t
*env_ptr
= NULL
;
33 char * env_name_spec
= "dataflash";
35 extern int read_dataflash (unsigned long addr
, unsigned long size
, char
37 extern int write_dataflash (unsigned long addr_dest
, unsigned long addr_src
,
39 extern int AT91F_DataflashInit (void);
40 extern uchar default_environment
[];
41 /* extern int default_environment_size; */
44 uchar
env_get_char_spec (int index
)
47 read_dataflash (CFG_ENV_ADDR
+index
+offsetof(env_t
,data
),1,&c
);
51 void env_relocate_spec (void)
53 read_dataflash (CFG_ENV_ADDR
,CFG_ENV_SIZE
,(uchar
*)env_ptr
);
58 /* env must be copied to do not alter env structure in memory*/
59 unsigned char temp
[CFG_ENV_SIZE
];
61 memcpy(temp
, env_ptr
, CFG_ENV_SIZE
);
62 return write_dataflash (CFG_ENV_ADDR
, (unsigned long)temp
, CFG_ENV_SIZE
);
65 /************************************************************************
66 * Initialize Environment use
68 * We are still running from ROM, so data use is limited
69 * Use a (moderately small) buffer on the stack
76 if (gd
->env_valid
== 0){
77 AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
80 read_dataflash (CFG_ENV_ADDR
+offsetof(env_t
,crc
),sizeof(ulong
),&crc
);
83 off
= offsetof(env_t
,data
);
85 int n
= (len
> sizeof(buf
)) ? sizeof(buf
) : len
;
86 read_dataflash (CFG_ENV_ADDR
+off
,n
, buf
);
87 new = crc32 (new, buf
, n
);
92 gd
->env_addr
= offsetof(env_t
,data
);
95 gd
->env_addr
= (ulong
)&default_environment
[0];
103 #endif /* CFG_ENV_IS_IN_DATAFLASH */