mpc83xx: increase MONITOR_LEN to offset growing pains

Saving the environment leads to overwriting u-boot itself,
bricking boards.  Increase u-boot's image size so the environment
base address doesn't end up overlapping u-boot text.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC8313ERDB.h b/include/configs/MPC8313ERDB.h
index 5149ce7..049c80d 100644
--- a/include/configs/MPC8313ERDB.h
+++ b/include/configs/MPC8313ERDB.h
@@ -211,7 +211,7 @@
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
 /* CONFIG_SYS_MONITOR_LEN must be a multiple of CONFIG_ENV_SECT_SIZE */
-#define CONFIG_SYS_MONITOR_LEN		(256 * 1024)	/* Reserve 256 kB for Mon */
+#define CONFIG_SYS_MONITOR_LEN		(384 * 1024)	/* Reserve 384 kB for Mon */
 #define CONFIG_SYS_MALLOC_LEN		(512 * 1024)	/* Reserved for malloc */
 
 /*