* LowLevel function for DataFlash environment support
* Author : Gilles Gastaldi (Atmel)
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
DECLARE_GLOBAL_DATA_PTR;
-env_t *env_ptr = NULL;
-
-char * env_name_spec = "dataflash";
-
-extern int read_dataflash(unsigned long addr, unsigned long size,
- char *result);
-extern int write_dataflash(unsigned long addr_dest,
- unsigned long addr_src, unsigned long size);
-extern int AT91F_DataflashInit(void);
+env_t *env_ptr;
-extern uchar default_environment[];
+char *env_name_spec = "dataflash";
uchar env_get_char_spec(int index)
{
uchar c;
- read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t,data),
+ read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
1, (char *)&c);
- return (c);
+ return c;
}
void env_relocate_spec(void)
{
+ ulong crc, new = 0;
+ unsigned off;
char buf[CONFIG_ENV_SIZE];
+ /* Read old CRC */
+ read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
+ sizeof(ulong), (char *)&crc);
+
+ /* Read whole environment */
read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
- env_import(buf, 1);
+ /* Calculate the CRC */
+ off = offsetof(env_t, data);
+ new = crc32(new, (unsigned char *)(buf + off), ENV_SIZE);
+
+ if (crc == new)
+ env_import(buf, 1);
+ else
+ set_default_env("!bad CRC");
}
#ifdef CONFIG_ENV_OFFSET_REDUND
int saveenv(void)
{
- env_t env_new;
- ssize_t len;
- char *res;
-
- res = (char *)&env_new.data;
- len = hexport('\0', &res, ENV_SIZE);
- if (len < 0) {
- error("Cannot export environment: errno = %d\n", errno);
- return 1;
- }
- env_new.crc = crc32(0, env_new.data, ENV_SIZE);
+ env_t env_new;
+ int ret;
+
+ ret = env_export(&env_new);
+ if (ret)
+ return ret;
return write_dataflash(CONFIG_ENV_ADDR,
(unsigned long)&env_new,
*/
int env_init(void)
{
- ulong crc, len, new;
- unsigned off;
- uchar buf[64];
-
- if (gd->env_valid)
- return 0;
-
- AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
-
- /* read old CRC */
- read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
- sizeof(ulong), (char *)&crc);
-
- new = 0;
- len = ENV_SIZE;
- off = offsetof(env_t,data);
- while (len > 0) {
- int n = (len > sizeof(buf)) ? sizeof(buf) : len;
-
- read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
-
- new = crc32 (new, buf, n);
- len -= n;
- off += n;
- }
-
- if (crc == new) {
- gd->env_addr = offsetof(env_t,data);
- gd->env_valid = 1;
- } else {
- gd->env_addr = (ulong)&default_environment[0];
- gd->env_valid = 0;
- }
+ /* use default */
+ gd->env_addr = (ulong)&default_environment[0];
+ gd->env_valid = 1;
return 0;
}