diff --git a/bsp/lm4f232/rtconfig.py b/bsp/lm4f232/rtconfig.py
index b2b9fabd629c02b94489bc64b4d5436363d5ff25..b34cab7f8e6cbbf9d5fe7c8acbdd4044853d5088 100644
--- a/bsp/lm4f232/rtconfig.py
+++ b/bsp/lm4f232/rtconfig.py
@@ -15,10 +15,10 @@ PART_TYPE = 'PART_LM4F232H5QD'
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
-	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+	EXEC_PATH 	= r'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
-	EXEC_PATH 	= 'C:/Keil'
+	EXEC_PATH 	= r'C:/Keil'
 elif CROSS_TOOL == 'iar':
     print '================ERROR============================'
     print 'Not support iar yet!'
@@ -44,7 +44,7 @@ if PLATFORM == 'gcc':
 
     DEVICE = ' -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections'
     CFLAGS = DEVICE 
-    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp'
+    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb,'
     LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-lm4f.map,-cref,-u,Reset_Handler -T lm4f_rom.ld'
 
     CPATH = ''
diff --git a/bsp/stm32f40x/rtconfig.py b/bsp/stm32f40x/rtconfig.py
index 6105fc66b70af75944868220d66cc68dc7a6d8a4..97ffb66f4754be53e25c0f807ecfbff75f80a77b 100644
--- a/bsp/stm32f40x/rtconfig.py
+++ b/bsp/stm32f40x/rtconfig.py
@@ -12,10 +12,10 @@ if os.getenv('RTT_CC'):
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
-	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+	EXEC_PATH 	= r'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
-	EXEC_PATH 	= 'C:/Keil'
+	EXEC_PATH 	= r'C:/Keil'
 elif CROSS_TOOL == 'iar':
     print '================ERROR============================'
     print 'Not support iar yet!'
@@ -42,7 +42,7 @@ if PLATFORM == 'gcc':
 
     DEVICE = ' -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections'
     CFLAGS = DEVICE 
-    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp'
+    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb,'
     LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-stm32.map,-cref,-u,Reset_Handler -T stm32_rom.ld'
 
     CPATH = ''
diff --git a/bsp/xplorer4330/m4/rtconfig.py b/bsp/xplorer4330/m4/rtconfig.py
index 4b400455351f5ed374029cd2ffc9eb9cfb762339..a691578c90ea05667b51ea1a66b389e7388d044b 100644
--- a/bsp/xplorer4330/m4/rtconfig.py
+++ b/bsp/xplorer4330/m4/rtconfig.py
@@ -12,10 +12,10 @@ if os.getenv('RTT_CC'):
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
-	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+	EXEC_PATH 	= r'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
-	EXEC_PATH 	= 'C:/Keil'
+	EXEC_PATH 	= r'C:/Keil'
 elif CROSS_TOOL == 'iar':
     print '================ERROR============================'
     print 'Not support iar yet!'
@@ -48,7 +48,7 @@ if PLATFORM == 'gcc':
 
     DEVICE = ' -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections'
     CFLAGS = DEVICE 
-    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp'
+    AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb,'
     LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-lpc4330.map,-cref,-u,Reset_Handler -T lpc4330_xplorer_spifi32mb.ld'
 
     CPATH = ''