diff --git a/bsp/lm3s/board.h b/bsp/lm3s/board.h
index 3c796846d46a181beb7a733b57bf3f57a2ed8d68..9a2f330aa04207eb7c69824a85238db8f4ae98e9 100644
--- a/bsp/lm3s/board.h
+++ b/bsp/lm3s/board.h
@@ -15,6 +15,11 @@
 #ifndef __BOARD_H__
 #define __BOARD_H__
 
+// <o> Internal SRAM memory size[Kbytes] <8-64>
+//	<i>Default: 64
+#define LM3S_SRAM_SIZE         64
+#define LM3S_SRAM_END          (0x20000000 + LM3S_SRAM_SIZE * 1024)
+
 void rt_hw_board_led_on(int n);
 void rt_hw_board_led_off(int n);
 void rt_hw_board_init(void);
diff --git a/bsp/lm3s/startup.c b/bsp/lm3s/startup.c
index cf2d45ac03246af5db1527624bafc56be94aed30..412b74c738bf6f1fbc30a551a1b00dc9e045160c 100644
--- a/bsp/lm3s/startup.c
+++ b/bsp/lm3s/startup.c
@@ -19,9 +19,9 @@
 
 /**
  * @addtogroup LM3S
- */
+ */
 
-extern void rt_hw_serial_init(void);
+extern void rt_hw_serial_init(void);
 
 /*@{*/
 #ifdef RT_USING_FINSH
@@ -82,12 +82,12 @@ void rtthread_startup(void)
 
 #ifdef RT_USING_HEAP
 #ifdef __CC_ARM
-	rt_system_heap_init((void*)&Image$$RW_IRAM1$$ZI$$Limit, (void*)0x20010000);
+	rt_system_heap_init((void*)&Image$$RW_IRAM1$$ZI$$Limit, (void*)LM3S_SRAM_END);
 #elif __ICCARM__
-    rt_system_heap_init(__segment_end("HEAP"), (void*)0x20010000);
+	rt_system_heap_init(__segment_end("HEAP"), (void*)LM3S_SRAM_END);
 #else
 	/* init memory system */
-	rt_system_heap_init((void*)&__bss_end, (void*)0x20010000);
+	rt_system_heap_init((void*)&__bss_end, (void*)LM3S_SRAM_END);
 #endif
 #endif
 
diff --git a/libcpu/arm/lm3s/start_gcc.s b/libcpu/arm/lm3s/start_gcc.s
index 81bca5b719bf6a7d5ef88597ebba484e69d08bc9..1d1b8e558dd476e184f63e2132b737d69374791d 100644
--- a/libcpu/arm/lm3s/start_gcc.s
+++ b/libcpu/arm/lm3s/start_gcc.s
@@ -1,32 +1,3 @@
-/**
-  ******************************************************************************
-  * @file      startup_stm32f10x_hd.s
-  * @author    MCD Application Team
-  * @version   V3.1.2
-  * @date      09/28/2009
-  * @brief     STM32F10x High Density Devices vector table for RIDE7 toolchain. 
-  *            This module performs:
-  *                - Set the initial SP
-  *                - Set the initial PC == Reset_Handler,
-  *                - Set the vector table entries with the exceptions ISR address,
-  *                - Configure external SRAM mounted on STM3210E-EVAL board
-  *                  to be used as data memory (optional, to be enabled by user)
-  *                - Branches to main in the C library (which eventually
-  *                  calls main()).
-  *            After Reset the Cortex-M3 processor is in Thread mode,
-  *            priority is Privileged, and the Stack is set to Main.
-  ******************************************************************************
-  * @copy
-  *
-  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
-  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
-  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
-  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
-  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
-  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
-  *
-  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
-  */  
 .section .bss.init
 .equ 	Stack_Size, 0x00000200
 .space 	Stack_Size
@@ -52,8 +23,6 @@ defined in linker script */
 /* end address for the .bss section. defined in linker script */
 .word  _ebss
 
-// .equ  Initial_spTop,  0x20000200
-.equ  BootRAM,        0xF1E0F85F
 /**
  * @brief  This is the code that gets called when the processor first
  *          starts execution following a reset event. Only the absolutely
@@ -131,17 +100,17 @@ Infinite_Loop:
 g_pfnVectors:
   .word  Initial_spTop
   .word  Reset_Handler
-  .word  Default_Handler										//NMI_Handler
+  .word  Default_Handler                     //NMI_Handler
   .word  rt_hw_hard_fault
-  .word  Default_Handler										//MemManage_Handler
-  .word  Default_Handler										//BusFault_Handler
-  .word  Default_Handler										//UsageFault_Handler
+  .word  Default_Handler                     //MemManage_Handler
+  .word  Default_Handler                     //BusFault_Handler
+  .word  Default_Handler                     //UsageFault_Handler
   .word  0
   .word  0
   .word  0
   .word  0
-  .word  Default_Handler										//SVC_Handler
-  .word  Default_Handler										//DebugMon_Handler
+  .word  Default_Handler                     //SVC_Handler
+  .word  Default_Handler                     //DebugMon_Handler
   .word  0
   .word  rt_hw_pend_sv
   .word  rt_hw_timer_handler