diff --git a/bsp/stm32f20x/Libraries/SConscript b/bsp/stm32f20x/Libraries/SConscript
index 17d1eff10c..e8a21b1510 100644
--- a/bsp/stm32f20x/Libraries/SConscript
+++ b/bsp/stm32f20x/Libraries/SConscript
@@ -7,7 +7,6 @@ cwd = GetCurrentDir()
 
 # The set of source files associated with this SConscript file.
 src = Split("""
-CMSIS/CM3/CoreSupport/core_cm3.c
 CMSIS/CM3/DeviceSupport/ST/STM32F2xx/system_stm32f2xx.c
 STM32F2xx_StdPeriph_Driver/src/misc.c
 STM32F2xx_StdPeriph_Driver/src/stm32f2xx_adc.c
@@ -54,9 +53,14 @@ elif rtconfig.CROSS_TOOL == 'iar':
     src = src + ['CMSIS/CM3/DeviceSupport/ST/STM32F2xx/startup/iar/' + startup_scripts]
 
 path = [cwd + '/STM32F2xx_StdPeriph_Driver/inc',
-    cwd + '/CMSIS/CM3/CoreSupport',
     cwd + '/CMSIS/CM3/DeviceSupport/ST/STM32F2xx']
 
+if GetDepend(['RT_USING_BSP_CMSIS']):
+    path += [cwd + '/CMSIS/CM3/CoreSupport']
+    src += [cwd + '/CMSIS/CM3/CoreSupport/core_cm3.c']
+elif GetDepend(['RT_USING_RTT_CMSIS']):
+    path += [RTT_ROOT + '/components/CMSIS/Include']
+
 if GetDepend('RT_USING_LWIP') == True:
 	src = src + ['STM32F2x7_ETH_Driver/src/stm32f2x7_eth.c']
 	path = path + [cwd + '/STM32F2x7_ETH_Driver/inc']
diff --git a/bsp/stm32f20x/project.ewp b/bsp/stm32f20x/project.ewp
index 644ff5298e..87026e2397 100644
--- a/bsp/stm32f20x/project.ewp
+++ b/bsp/stm32f20x/project.ewp
@@ -12,7 +12,7 @@
       <name>General</name>
       <archiveVersion>3</archiveVersion>
       <data>
-        <version>20</version>
+        <version>21</version>
         <wantNonLocal>1</wantNonLocal>
         <debug>1</debug>
         <option>
@@ -29,7 +29,7 @@
         </option>
         <option>
           <name>Variant</name>
-          <version>18</version>
+          <version>19</version>
           <state>37</state>
         </option>
         <option>
@@ -38,8 +38,8 @@
         </option>
         <option>
           <name>Input variant</name>
-          <version>1</version>
-          <state>0</state>
+          <version>3</version>
+          <state>1</state>
         </option>
         <option>
           <name>Input description</name>
@@ -47,8 +47,8 @@
         </option>
         <option>
           <name>Output variant</name>
-          <version>0</version>
-          <state>0</state>
+          <version>2</version>
+          <state>1</state>
         </option>
         <option>
           <name>Output description</name>
@@ -87,7 +87,7 @@
         </option>
         <option>
           <name>OGLastSavedByProductVersion</name>
-          <state>6.10.1.52170</state>
+          <state>6.30.6.53380</state>
         </option>
         <option>
           <name>GeneralEnableMisra</name>
@@ -99,7 +99,7 @@
         </option>
         <option>
           <name>OGChipSelectEditMenu</name>
-          <state>STM32F207xx	ST STM32F207xx</state>
+          <state>STM32F207ZG	ST STM32F207ZG</state>
         </option>
         <option>
           <name>GenLowLevelInterface</name>
@@ -137,21 +137,29 @@
         </option>
         <option>
           <name>GFPUCoreSlave</name>
-          <version>18</version>
+          <version>19</version>
           <state>37</state>
         </option>
         <option>
           <name>GBECoreSlave</name>
-          <version>18</version>
+          <version>19</version>
           <state>37</state>
         </option>
+        <option>
+          <name>OGUseCmsis</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>OGUseCmsisDspLib</name>
+          <state>0</state>
+        </option>
       </data>
     </settings>
     <settings>
       <name>ICCARM</name>
       <archiveVersion>2</archiveVersion>
       <data>
-        <version>26</version>
+        <version>28</version>
         <wantNonLocal>1</wantNonLocal>
         <debug>1</debug>
         <option>
@@ -287,13 +295,15 @@
         <option>
           <name>CCIncludePath2</name>
           <state></state>
-          <state>$PROJ_DIR$\..\..\components\finsh</state>
-          <state>$PROJ_DIR$\.</state>
           <state>$PROJ_DIR$\..\..\include</state>
-          <state>$PROJ_DIR$\Libraries\CMSIS\CM3\CoreSupport</state>
-          <state>$PROJ_DIR$\Libraries\STM32F2xx_StdPeriph_Driver\inc</state>
+          <state>$PROJ_DIR$\..\..\components\finsh</state>
+          <state>$PROJ_DIR$\drivers</state>
+          <state>$PROJ_DIR$\..\..\components\CMSIS\Include</state>
+          <state>$PROJ_DIR$\.</state>
+          <state>$PROJ_DIR$\applications</state>
+          <state>$PROJ_DIR$\..\..\libcpu\arm\cortex-m3</state>
           <state>$PROJ_DIR$\..\..\libcpu\arm\common</state>
-          <state>$PROJ_DIR$\..\..\libcpu\arm\stm32</state>
+          <state>$PROJ_DIR$\Libraries\STM32F2xx_StdPeriph_Driver\inc</state>
           <state>$PROJ_DIR$\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F2xx</state>
         </option>
         <option>
@@ -376,11 +386,15 @@
           <state>1</state>
         </option>
         <option>
-          <name>IccRelaxedFpPrecision</name>
+          <name>IccCppInlineSemantics</name>
           <state>0</state>
         </option>
         <option>
-          <name>IccCppInlineSemantics</name>
+          <name>IccCmsis</name>
+          <state>1</state>
+        </option>
+        <option>
+          <name>IccFloatSemantics</name>
           <state>0</state>
         </option>
       </data>
@@ -602,7 +616,7 @@
       <name>ILINK</name>
       <archiveVersion>0</archiveVersion>
       <data>
-        <version>11</version>
+        <version>14</version>
         <wantNonLocal>1</wantNonLocal>
         <debug>1</debug>
         <option>
@@ -848,6 +862,34 @@
           <name>IlinkOptExceptionsForce</name>
           <state>0</state>
         </option>
+        <option>
+          <name>IlinkCmsis</name>
+          <state>1</state>
+        </option>
+        <option>
+          <name>IlinkOptMergeDuplSections</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>IlinkOptUseVfe</name>
+          <state>1</state>
+        </option>
+        <option>
+          <name>IlinkOptForceVfe</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>IlinkStackAnalysisEnable</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>IlinkStackControlFile</name>
+          <state></state>
+        </option>
+        <option>
+          <name>IlinkStackCallGraphFile</name>
+          <state></state>
+        </option>
       </data>
     </settings>
     <settings>
@@ -887,7 +929,7 @@
       <name>General</name>
       <archiveVersion>3</archiveVersion>
       <data>
-        <version>20</version>
+        <version>21</version>
         <wantNonLocal>1</wantNonLocal>
         <debug>0</debug>
         <option>
@@ -904,7 +946,7 @@
         </option>
         <option>
           <name>Variant</name>
-          <version>18</version>
+          <version>19</version>
           <state>0</state>
         </option>
         <option>
@@ -913,8 +955,8 @@
         </option>
         <option>
           <name>Input variant</name>
-          <version>1</version>
-          <state>0</state>
+          <version>3</version>
+          <state>1</state>
         </option>
         <option>
           <name>Input description</name>
@@ -922,8 +964,8 @@
         </option>
         <option>
           <name>Output variant</name>
-          <version>0</version>
-          <state>0</state>
+          <version>2</version>
+          <state>1</state>
         </option>
         <option>
           <name>Output description</name>
@@ -962,7 +1004,7 @@
         </option>
         <option>
           <name>OGLastSavedByProductVersion</name>
-          <state></state>
+          <state>6.30.6.53380</state>
         </option>
         <option>
           <name>GeneralEnableMisra</name>
@@ -1012,12 +1054,20 @@
         </option>
         <option>
           <name>GFPUCoreSlave</name>
-          <version>18</version>
+          <version>19</version>
           <state>0</state>
         </option>
         <option>
           <name>GBECoreSlave</name>
-          <version>18</version>
+          <version>19</version>
+          <state>0</state>
+        </option>
+        <option>
+          <name>OGUseCmsis</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>OGUseCmsisDspLib</name>
           <state>0</state>
         </option>
       </data>
@@ -1026,7 +1076,7 @@
       <name>ICCARM</name>
       <archiveVersion>2</archiveVersion>
       <data>
-        <version>26</version>
+        <version>28</version>
         <wantNonLocal>1</wantNonLocal>
         <debug>0</debug>
         <option>
@@ -1162,13 +1212,15 @@
         <option>
           <name>CCIncludePath2</name>
           <state></state>
-          <state>$PROJ_DIR$\..\..\components\finsh</state>
-          <state>$PROJ_DIR$\.</state>
           <state>$PROJ_DIR$\..\..\include</state>
-          <state>$PROJ_DIR$\Libraries\CMSIS\CM3\CoreSupport</state>
-          <state>$PROJ_DIR$\Libraries\STM32F2xx_StdPeriph_Driver\inc</state>
+          <state>$PROJ_DIR$\..\..\components\finsh</state>
+          <state>$PROJ_DIR$\drivers</state>
+          <state>$PROJ_DIR$\..\..\components\CMSIS\Include</state>
+          <state>$PROJ_DIR$\.</state>
+          <state>$PROJ_DIR$\applications</state>
+          <state>$PROJ_DIR$\..\..\libcpu\arm\cortex-m3</state>
           <state>$PROJ_DIR$\..\..\libcpu\arm\common</state>
-          <state>$PROJ_DIR$\..\..\libcpu\arm\stm32</state>
+          <state>$PROJ_DIR$\Libraries\STM32F2xx_StdPeriph_Driver\inc</state>
           <state>$PROJ_DIR$\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F2xx</state>
         </option>
         <option>
@@ -1251,11 +1303,15 @@
           <state>1</state>
         </option>
         <option>
-          <name>IccRelaxedFpPrecision</name>
+          <name>IccCppInlineSemantics</name>
           <state>0</state>
         </option>
         <option>
-          <name>IccCppInlineSemantics</name>
+          <name>IccCmsis</name>
+          <state>1</state>
+        </option>
+        <option>
+          <name>IccFloatSemantics</name>
           <state>0</state>
         </option>
       </data>
@@ -1477,7 +1533,7 @@
       <name>ILINK</name>
       <archiveVersion>0</archiveVersion>
       <data>
-        <version>11</version>
+        <version>14</version>
         <wantNonLocal>1</wantNonLocal>
         <debug>0</debug>
         <option>
@@ -1723,6 +1779,34 @@
           <name>IlinkOptExceptionsForce</name>
           <state>0</state>
         </option>
+        <option>
+          <name>IlinkCmsis</name>
+          <state>1</state>
+        </option>
+        <option>
+          <name>IlinkOptMergeDuplSections</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>IlinkOptUseVfe</name>
+          <state>1</state>
+        </option>
+        <option>
+          <name>IlinkOptForceVfe</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>IlinkStackAnalysisEnable</name>
+          <state>0</state>
+        </option>
+        <option>
+          <name>IlinkStackControlFile</name>
+          <state></state>
+        </option>
+        <option>
+          <name>IlinkStackCallGraphFile</name>
+          <state></state>
+        </option>
       </data>
     </settings>
     <settings>
@@ -1752,6 +1836,60 @@
       <data/>
     </settings>
   </configuration>
+  <group>
+    <name>Applications</name>
+    <file>
+      <name>$PROJ_DIR$\applications\application.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\applications\startup.c</name>
+    </file>
+  </group>
+  <group>
+    <name>CORTEX-M3</name>
+    <file>
+      <name>$PROJ_DIR$\..\..\libcpu\arm\common\backtrace.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\..\..\libcpu\arm\cortex-m3\context_iar.S</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\..\..\libcpu\arm\cortex-m3\cpuport.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\..\..\libcpu\arm\common\div0.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\..\..\libcpu\arm\common\showmem.c</name>
+    </file>
+  </group>
+  <group>
+    <name>Drivers</name>
+    <file>
+      <name>$PROJ_DIR$\Drivers\24LCxx.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\board.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\FM25Lx.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\i2c.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\rtc.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\serial.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\stm32f2xx_it.c</name>
+    </file>
+    <file>
+      <name>$PROJ_DIR$\Drivers\usart.c</name>
+    </file>
+  </group>
   <group>
     <name>finsh</name>
     <file>
@@ -1820,21 +1958,12 @@
     <file>
       <name>$PROJ_DIR$\..\..\src\mempool.c</name>
     </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\src\module.c</name>
-    </file>
     <file>
       <name>$PROJ_DIR$\..\..\src\object.c</name>
     </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\src\rtm.c</name>
-    </file>
     <file>
       <name>$PROJ_DIR$\..\..\src\scheduler.c</name>
     </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\src\slab.c</name>
-    </file>
     <file>
       <name>$PROJ_DIR$\..\..\src\thread.c</name>
     </file>
@@ -1842,53 +1971,8 @@
       <name>$PROJ_DIR$\..\..\src\timer.c</name>
     </file>
   </group>
-  <group>
-    <name>Startup</name>
-    <file>
-      <name>$PROJ_DIR$\.\application.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\.\board.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\rtc.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\.\serial.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\.\startup.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\.\stm32f20x_it.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\.\usart.c</name>
-    </file>
-  </group>
-  <group>
-    <name>STM32</name>
-    <file>
-      <name>$PROJ_DIR$\..\..\libcpu\arm\common\backtrace.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\libcpu\arm\cortex-m3\context_iar.S</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\libcpu\arm\cortex-m3\cpuport.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\libcpu\arm\common\div0.c</name>
-    </file>
-    <file>
-      <name>$PROJ_DIR$\..\..\libcpu\arm\common\showmem.c</name>
-    </file>
-  </group>
   <group>
     <name>STM32_StdPeriph</name>
-    <file>
-      <name>$PROJ_DIR$\Libraries\CMSIS\CM3\CoreSupport\core_cm3.c</name>
-    </file>
     <file>
       <name>$PROJ_DIR$\Libraries\STM32F2xx_StdPeriph_Driver\src\misc.c</name>
     </file>
diff --git a/bsp/stm32f20x/rtconfig.h b/bsp/stm32f20x/rtconfig.h
index 01f860b160..ff7ac184f1 100644
--- a/bsp/stm32f20x/rtconfig.h
+++ b/bsp/stm32f20x/rtconfig.h
@@ -131,4 +131,11 @@
 #define RT_LWIP_ETHTHREAD_MBOX_SIZE		4
 #define RT_LWIP_ETHTHREAD_STACKSIZE		512
 
+// <bool name="RT_USING_CMSIS_OS" description="Using CMSIS OS API" default="true" />
+// #define RT_USING_CMSIS_OS
+// <bool name="RT_USING_RTT_CMSIS" description="Using CMSIS in RTT" default="true" />
+#define RT_USING_RTT_CMSIS
+// <bool name="RT_USING_BSP_CMSIS" description="Using CMSIS in BSP" default="true" />
+// #define RT_USING_BSP_CMSIS
+
 #endif