[U-Boot] [PATCH] mx53loco: Fix U-Boot corruption after saving the environment

[Fabio Estevam <festevam@gmail.com>]

U-Boot binary has grown in such a way that it goes beyond the reserved
area for the environment variables.
    
Running "saveenv" causes U-Boot to hang because of this overlap.
    
Fix this problem by increasing the CONFIG_ENV_OFFSET size.
    
Also, in order to prevent this same problem in the future, use
CONFIG_BOARD_SIZE_LIMIT, which will detect the overlap in build-time.
    
CONFIG_BOARD_SIZE_LIMIT does not accept math expressions, so declare
CONFIG_ENV_OFFSET with its direct value instead.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
 include/configs/mx53loco.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/configs/mx53loco.h b/include/configs/mx53loco.h
index b734b822dd..65a5993f61 100644
--- a/include/configs/mx53loco.h
+++ b/include/configs/mx53loco.h
@@ -163,8 +163,18 @@
 #define CONFIG_SYS_INIT_SP_ADDR \
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
 
-/* environment organization */
-#define CONFIG_ENV_OFFSET      (6 * 64 * 1024)
+/* Environment starts at 768k = 768 * 1024 = 786432 */
+#define CONFIG_ENV_OFFSET		786432
+/*
+ * Detect overlap between U-Boot image and environment area in build-time
+ *
+ * CONFIG_BOARD_SIZE_LIMIT = CONFIG_ENV_OFFSET - u-boot.imx offset
+ * CONFIG_BOARD_SIZE_LIMIT = 768k - 1k = 767k = 785408
+ *
+ * Currently CONFIG_BOARD_SIZE_LIMIT does not handle expressions, so
+ * write the direct value here
+ */
+#define CONFIG_BOARD_SIZE_LIMIT		785408
 #define CONFIG_ENV_SIZE        (8 * 1024)
 #define CONFIG_SYS_MMC_ENV_DEV 0
 
-- 
2.17.1