Increase CFG_MONITOR_LEN for Rattler board to match actual code size.
diff --git a/include/configs/Rattler.h b/include/configs/Rattler.h
index 46dc78b..f98a6c6 100644
--- a/include/configs/Rattler.h
+++ b/include/configs/Rattler.h
@@ -195,7 +195,7 @@
 #define CFG_RAMBOOT
 #endif
 
-#define CFG_MONITOR_LEN		(192 << 10)	/* Reserve 192 kB for Monitor	*/
+#define CFG_MONITOR_LEN		(256 << 10)	/* Reserve 256 kB for Monitor	*/
 
 #define CFG_ENV_IS_IN_FLASH