2 * LowLevel function for DataFlash environment support
3 * Author : Gilles Gastaldi (Atmel)
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 #include <environment.h>
23 #include <linux/stddef.h>
24 #include <dataflash.h>
28 DECLARE_GLOBAL_DATA_PTR;
30 env_t *env_ptr = NULL;
32 char * env_name_spec = "dataflash";
34 extern int read_dataflash(unsigned long addr, unsigned long size,
36 extern int write_dataflash(unsigned long addr_dest,
37 unsigned long addr_src, unsigned long size);
38 extern int AT91F_DataflashInit(void);
40 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 char buf[CONFIG_ENV_SIZE];
53 read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
58 #ifdef CONFIG_ENV_OFFSET_REDUND
59 #error No support for redundant environment on dataflash yet!
68 res = (char *)&env_new.data;
69 len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, 0, NULL);
71 error("Cannot export environment: errno = %d\n", errno);
74 env_new.crc = crc32(0, env_new.data, ENV_SIZE);
76 return write_dataflash(CONFIG_ENV_ADDR,
77 (unsigned long)&env_new,
82 * Initialize environment use
84 * We are still running from ROM, so data use is limited.
85 * Use a (moderately small) buffer on the stack
96 AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
99 read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
100 sizeof(ulong), (char *)&crc);
104 off = offsetof(env_t,data);
106 int n = (len > sizeof(buf)) ? sizeof(buf) : len;
108 read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
110 new = crc32 (new, buf, n);
116 gd->env_addr = offsetof(env_t,data);
119 gd->env_addr = (ulong)&default_environment[0];