diff --git a/bsp/stm32f20x/rtconfig.py b/bsp/stm32f20x/rtconfig.py
index c083c43708..e7b78f2f7c 100644
--- a/bsp/stm32f20x/rtconfig.py
+++ b/bsp/stm32f20x/rtconfig.py
@@ -13,7 +13,7 @@ if  CROSS_TOOL == 'gcc':
 	EXEC_PATH 	= 'C:/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
-	EXEC_PATH 	= 'C:/Keil/ARM/BIN40'
+	EXEC_PATH 	= 'C:/Keil'
 elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'C:/Program Files/IAR Systems/Embedded Workbench 6.0 Evaluation'	
@@ -47,7 +47,7 @@ if PLATFORM == 'gcc':
         CFLAGS += ' -O0 -gdwarf-2'
         AFLAGS += ' -gdwarf-2'
     else:
-        CFLAGS += ' -O2'
+        CFLAGS += ' -O3'
 
     POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' + SIZE + ' $TARGET \n'