diff --git a/bsp/stm32f107/stm32_rom.ld b/bsp/stm32f107/stm32_rom.ld
index 60086674b2ee8cdaeff81cfc7b195b0d36a35a79..f9b233e4684c98fbe0fa7aa732300fb55bcf82d5 100644
--- a/bsp/stm32f107/stm32_rom.ld
+++ b/bsp/stm32f107/stm32_rom.ld
@@ -17,6 +17,7 @@ SECTIONS
     .text :
     {
         . = ALIGN(4);
+        _stext = .;
         KEEP(*(.isr_vector))            /* Startup code */
         . = ALIGN(4);
         *(.text)                        /* remaining code */
diff --git a/bsp/stm32f10x/stm32_rom.ld b/bsp/stm32f10x/stm32_rom.ld
index 69ca301a9293f26839c1536f703d771f0dfc0c2f..0aa6438ef917685e73d5881fafb683e218067e9c 100644
--- a/bsp/stm32f10x/stm32_rom.ld
+++ b/bsp/stm32f10x/stm32_rom.ld
@@ -17,6 +17,7 @@ SECTIONS
     .text :
     {
         . = ALIGN(4);
+        _stext = .;
         KEEP(*(.isr_vector))            /* Startup code */
         . = ALIGN(4);
         *(.text)                        /* remaining code */
diff --git a/bsp/stm32f20x/stm32_rom.ld b/bsp/stm32f20x/stm32_rom.ld
index ff9918899fa901ec4dcb8e2723473a1805c291bb..96cab8124c744404055c60cfc041e9a3500232e6 100644
--- a/bsp/stm32f20x/stm32_rom.ld
+++ b/bsp/stm32f20x/stm32_rom.ld
@@ -17,6 +17,7 @@ SECTIONS
     .text :
     {
         . = ALIGN(4);
+        _stext = .;
         KEEP(*(.isr_vector))            /* Startup code */
         . = ALIGN(4);
         *(.text)                        /* remaining code */
diff --git a/bsp/stm32f40x/stm32_rom.ld b/bsp/stm32f40x/stm32_rom.ld
index 69ca301a9293f26839c1536f703d771f0dfc0c2f..0aa6438ef917685e73d5881fafb683e218067e9c 100644
--- a/bsp/stm32f40x/stm32_rom.ld
+++ b/bsp/stm32f40x/stm32_rom.ld
@@ -17,6 +17,7 @@ SECTIONS
     .text :
     {
         . = ALIGN(4);
+        _stext = .;
         KEEP(*(.isr_vector))            /* Startup code */
         . = ALIGN(4);
         *(.text)                        /* remaining code */
diff --git a/components/external/lua/README.TXT b/components/external/lua/README.TXT
index bfe8db60b3562fcdb6e1fc002b9143b2873deb35..d983056198758f849f84a2cd6292b7f15c0ea170 100644
--- a/components/external/lua/README.TXT
+++ b/components/external/lua/README.TXT
@@ -2,7 +2,7 @@
 
 ## 简介
 RT-Thread中的Lua修改自[eLua](http://www.eluaproject.net/)的Lua-5.1.4版本。
-Lua依赖于Neblib库。
+采用gcc工具链时，Lua依赖于newlib库，其它工具链暂时还不支持。
 启动lua的RAM占用情况
     - 标准的lua        17.1904296875 KB
     - 优化的lua        5.01953125 KB
@@ -24,13 +24,14 @@ Lua依赖于Neblib库。
     3.更多的配置项可以在luaconf.h中找到
 
 ## 开发相关
+    - 采用gcc工具链时，依赖于newlib，需在rtconfig.h中定义RT_USING_NEWLIB
     - 开启编译器对C99的支持，如MDK中，在C/C++选项的Misc Controls输入框中添加--c99
-    - 开启内存优化时：需要在链接脚本中定义_stext和_etext，.ordata*放在两者之间。
+    - 需要在链接脚本中定义_stext和_etext，.ordata*放在两者之间。
       用于判断数据是read-only和writable。MDK中如何实现？？
-    - 添加新的模块，参见larduinolib.c
+    - 添加新的模块，参见lexample.c
     
 ## 目录说明
     - lua：从eLua获得Lua-5.1.4版本代码
-    - exlibs：external libraries，外部库代码，如Arduino库
+    - exlibs：external libraries，外部库代码，如example库
     - applications：Lua应用代码，如finsh中lua()
     - test：测试代码
diff --git a/components/libc/newlib/syscalls.c b/components/libc/newlib/syscalls.c
index 6f670c8ef2a0e306988d5bc5a862613863d653e5..4405c5ce71e376a178e6884e8502a4722c186a71 100644
--- a/components/libc/newlib/syscalls.c
+++ b/components/libc/newlib/syscalls.c
@@ -197,7 +197,6 @@ _wait_r(struct _reent *ptr, int *status)
 _ssize_t
 _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
-#ifndef RT_USING_DFS
 	if (fd < 3)
 	{
 		rt_device_t console_device;
@@ -207,13 +206,13 @@ _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 		if (console_device != 0) rt_device_write(console_device, 0, buf, nbytes);
 		return nbytes;
 	}
-	return 0;
-#else
-	_ssize_t rc;
+	else
+	{
+	    _ssize_t rc;
 
-	rc = write(fd, buf, nbytes);
-	return rc;
-#endif
+	    rc = write(fd, buf, nbytes);
+	    return rc;
+	}
 }
 #endif