diff --git a/bsp/stm3210/SConstruct b/bsp/stm3210/SConstruct
index 67451b59225899f1c1052e7e552d61d7c5457ede..f57833a134b73733c2bbea44d66d0b4ba591f753 100644
--- a/bsp/stm3210/SConstruct
+++ b/bsp/stm3210/SConstruct
@@ -37,7 +37,7 @@ if rtconfig.RT_USING_LWIP:
 	objs = objs + SConscript(RTT_ROOT + '/net/lwip/SConscript', variant_dir='build/net/lwip', duplicate=0)
 
 src_bsp = ['application.c', 'startup.c', 'board.c', 'stm32f10x_it.c']
-src_drv = ['rtc.c', 'usart.c']
+src_drv = ['rtc.c', 'usart.c', 'led.c']
 
 if rtconfig.RT_USING_DFS:
 	if rtconfig.STM32_TYPE == 'STM32F10X_HD':
diff --git a/bsp/stm3210/rtconfig.py b/bsp/stm3210/rtconfig.py
index 5e76672df7fe52eae5125525acf02df7f038e04e..26ed7866a6706e56803d34bd1ba90550cedc7135 100644
--- a/bsp/stm3210/rtconfig.py
+++ b/bsp/stm3210/rtconfig.py
@@ -1,28 +1,59 @@
+import SCons.cpp
+
 # component options
-# finsh shell option
-RT_USING_FINSH = True
 
-# device file system options
-RT_USING_DFS = True
-RT_USING_DFS_EFSL = True
-RT_USING_DFS_ELMFAT = False
+# make all component false
+RT_USING_FINSH 		= False
+RT_USING_DFS 		= False
+RT_USING_DFS_EFSL 	= False
 RT_USING_DFS_YAFFS2 = False
+RT_USING_LWIP 		= False
+RT_USING_WEBSERVER	= False
+RT_USING_RTGUI 		= False
+
+# parse rtconfig.h to get used component
+PreProcessor = SCons.cpp.PreProcessor()
+f = file('rtconfig.h', 'r')
+contents = f.read()
+f.close()
+PreProcessor.process_contents(contents)
+rtconfig_ns = PreProcessor.cpp_namespace
+
+# finsh shell options
+if rtconfig_ns.has_key('RT_USING_FINSH'):
+	RT_USING_FINSH = True
+
+# device virtual filesystem options
+if rtconfig_ns.has_key('RT_USING_DFS'):
+    RT_USING_DFS = True
+
+    if rtconfig_ns.has_key('RT_USING_DFS_EFSL'):
+        RT_USING_DFS_EFSL = True
+    if rtconfig_ns.has_key('RT_USING_DFS_YAFFS2'):
+        RT_USING_DFS_YAFFS2 = True
 
 # lwip options
-RT_USING_LWIP = True
+if rtconfig_ns.has_key('RT_USING_LWIP'):
+    RT_USING_LWIP = True
+    if rtconfig_ns.has_key('RT_USING_WEBSERVER'):
+        RT_USING_WEBSERVER = True
 
 # rtgui options
-RT_USING_RTGUI = False
+if rtconfig_ns.has_key('RT_USING_RTGUI'):
+    RT_USING_RTGUI = True
 
 # toolchains options
 ARCH='arm'
 CPU='stm32'
-PLATFORM = 'gcc'
-EXEC_PATH = 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
-#PLATFORM = 'armcc'
-#EXEC_PATH = 'C:/Keil'
-#PLATFORM = 'iar'
-#EXEC_PATH = 'E:/Program Files/IAR Systems/Embedded Workbench 5.4/'
+CROSS_TOOL='gcc'
+
+if  CROSS_TOOL == 'gcc':
+	PLATFORM 	= 'gcc'
+	EXEC_PATH 	= 'D:/SourceryGCC/bin'
+elif CROSS_TOOL == 'keil':
+	PLATFORM 	= 'armcc'
+	EXEC_PATH 	= 'E:/Keil'
+
 BUILD = 'debug'
 STM32_TYPE = 'STM32F10X_HD'
 
diff --git a/libcpu/arm/stm32/serial.c b/libcpu/arm/stm32/serial.c
index 19b0d80375443776bbb666f79b841a1a18ad4330..f77e92e254266a6de19fc09069e6338f0b933ac2 100644
--- a/libcpu/arm/stm32/serial.c
+++ b/libcpu/arm/stm32/serial.c
@@ -335,6 +335,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 		if (size > 0)
 			err_code = -RT_EFULL;
 	}
+#ifdef RT_USING_HEAP
 	else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
 	{
 		/* DMA mode Tx */
@@ -381,6 +382,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
 			rt_hw_interrupt_enable(level);
 		}
 	}
+#endif
 	else
 	{
 		/* polling mode */
@@ -544,6 +546,7 @@ void rt_hw_serial_dma_rx_isr(rt_device_t device)
  */
 void rt_hw_serial_dma_tx_isr(rt_device_t device)
 {
+#ifdef RT_USING_HEAP
 	rt_uint32_t level;
 	struct stm32_serial_data_node* data_node;
 	struct stm32_serial_device* uart = (struct stm32_serial_device*) device->private;
@@ -570,7 +573,7 @@ void rt_hw_serial_dma_tx_isr(rt_device_t device)
 	/* enable interrupt */
 	rt_hw_interrupt_enable(level);
 
-	/* free data node memory */
+	/* free data node memory(!!) */
 	rt_free(data_node);
 
 	if (uart->dma_tx->list_tail != RT_NULL)
@@ -585,6 +588,7 @@ void rt_hw_serial_dma_tx_isr(rt_device_t device)
 		/* no data to be transmitted, disable DMA */
 		DMA_Cmd(uart->dma_tx->dma_channel, DISABLE);
 	}
+#endif
 }
 
 /*@}*/