blackfin: fix building error by enlarging the memory size

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
diff --git a/include/configs/bf561-acvilon.h b/include/configs/bf561-acvilon.h
index ee585c0..15ca1af 100644
--- a/include/configs/bf561-acvilon.h
+++ b/include/configs/bf561-acvilon.h
@@ -53,7 +53,7 @@
 #define CONFIG_EBIU_AMBCTL0_VAL		0xffc2ffc2
 #define CONFIG_EBIU_AMBCTL1_VAL		0x99b35554
 
-#define CONFIG_SYS_MONITOR_LEN		(256 * 1024)
+#define CONFIG_SYS_MONITOR_LEN		(384 * 1024)
 #define CONFIG_SYS_MALLOC_LEN		(128 * 1024)