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;
32 char *env_name_spec = "dataflash";
33 static char env_buf[CONFIG_ENV_SIZE];
35 uchar env_get_char_spec(int index)
39 read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
44 void env_relocate_spec(void)
46 read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, env_buf);
48 env_import(env_buf, 1);
51 #ifdef CONFIG_ENV_OFFSET_REDUND
52 #error No support for redundant environment on dataflash yet!
57 env_t *env_new = (env_t *)env_buf;
61 res = (char *)env_new->data;
62 len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
64 error("Cannot export environment: errno = %d\n", errno);
67 env_new->crc = crc32(0, env_new->data, ENV_SIZE);
69 return write_dataflash(CONFIG_ENV_ADDR,
70 (unsigned long)env_new,
75 * Initialize environment use
77 * We are still running from ROM, so data use is limited.
78 * Use a (moderately small) buffer on the stack
82 ulong crc, len = ENV_SIZE, new = 0;
89 AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
92 read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
93 sizeof(ulong), (char *)&crc);
95 off = offsetof(env_t, data);
97 int n = (len > sizeof(buf)) ? sizeof(buf) : len;
99 read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
101 new = crc32(new, buf, n);
107 gd->env_addr = offsetof(env_t, data);
110 gd->env_addr = (ulong)&default_environment[0];