* Patch by Nicolas Lacressonnière, 12 Nov 2003:
update for for Atmel AT91RM9200DK development kit:
- support for environment variables in DataFlash
- Atmel DataFlash AT45DB1282 support
* Patch by Jeff Carr, 11 Nov 2003:
add support for new version of 8270 processors
* Patches by George G. Davis, 05 Nov 2003:
- only pass the ARM linux initrd tag to the kernel when an initrd
is actually present
- update omap1510inn configuration file
diff --git a/common/env_dataflash.c b/common/env_dataflash.c
new file mode 100644
index 0000000..8bfbbc9
--- /dev/null
+++ b/common/env_dataflash.c
@@ -0,0 +1,104 @@
+/* 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
+ *
+ */
+#include <common.h>
+
+#if defined(CFG_ENV_IS_IN_DATAFLASH) /* Environment is in DataFlash */
+
+#include <command.h>
+#include <environment.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+#include <dataflash.h>
+
+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);
+extern uchar default_environment[];
+/* extern int default_environment_size; */
+
+
+uchar env_get_char_spec (int index)
+{
+ uchar c;
+ read_dataflash (CFG_ENV_ADDR+index+offsetof(env_t,data),1,&c);
+ return (c);
+}
+
+void env_relocate_spec (void)
+{
+ read_dataflash (CFG_ENV_ADDR,CFG_ENV_SIZE,(uchar *)env_ptr);
+}
+
+int saveenv(void)
+{
+/* env must be copied to do not alter env structure in memory*/
+unsigned char temp[CFG_ENV_SIZE];
+int i;
+ memcpy(temp, env_ptr, CFG_ENV_SIZE);
+ return write_dataflash (CFG_ENV_ADDR, (unsigned long)temp, CFG_ENV_SIZE);
+}
+
+/************************************************************************
+ * Initialize Environment use
+ *
+ * We are still running from ROM, so data use is limited
+ * Use a (moderately small) buffer on the stack
+ */
+int env_init(void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ ulong crc, len, new;
+ unsigned off;
+ uchar buf[64];
+ if (gd->env_valid == 0){
+ AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
+
+ /* read old CRC */
+ read_dataflash (CFG_ENV_ADDR+offsetof(env_t,crc),sizeof(ulong),&crc);
+ new = 0;
+ len = ENV_SIZE;
+ off = offsetof(env_t,data);
+ while (len > 0) {
+ int n = (len > sizeof(buf)) ? sizeof(buf) : len;
+ read_dataflash (CFG_ENV_ADDR+off,n , 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;
+ }
+ }
+
+ return (0);
+}
+
+#endif /* CFG_ENV_IS_IN_DATAFLASH */
