[U-Boot] [PATCH] at91sam9x5: mmc: save environment as a file in FAT partition.

[Josh Wu]

This patch will save U-Boot environment as a file: uboot.env, in FAT partition 
instead of saving it in raw sector of SD card.
Since saving environment in raw sector has risk of corrupting the SD card and 
only can use very small size.
Save as a FAT file has no above limitation.

Signed-off-by: Josh Wu <josh.wu at atmel.com>
---
this patch is based on v2013.01.

 include/configs/at91sam9x5ek.h |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/configs/at91sam9x5ek.h b/include/configs/at91sam9x5ek.h
index 6fac5ac..b01bb30 100644
--- a/include/configs/at91sam9x5ek.h
+++ b/include/configs/at91sam9x5ek.h
@@ -217,11 +217,13 @@
 				"bootm 0x22000000"
 #else /* CONFIG_SYS_USE_MMC */
 /* bootstrap + u-boot + env + linux in mmc */
-#define CONFIG_ENV_IS_IN_MMC
-/* For FAT system, most cases it should be in the reserved sector */
-#define CONFIG_ENV_OFFSET	0x2000
-#define CONFIG_ENV_SIZE		0x1000
-#define CONFIG_SYS_MMC_ENV_DEV	0
+#define CONFIG_ENV_IS_IN_FAT
+#define CONFIG_FAT_WRITE
+#define FAT_ENV_INTERFACE	"mmc"
+#define FAT_ENV_FILE		"uboot.env"
+#define FAT_ENV_DEVICE		0
+#define FAT_ENV_PART		1
+#define CONFIG_ENV_SIZE		0x4000
 #endif
 
 #ifdef CONFIG_SYS_USE_MMC
-- 
1.7.9.5