diff --git a/bsp/simlinux/drivers/SConscript b/bsp/simlinux/drivers/SConscript
index 34b1a0bda743878e36bbdc61c0ec979efb6b928c..079d329c0e4311e5cfca3859fe12f18cc3bad27a 100755
--- a/bsp/simlinux/drivers/SConscript
+++ b/bsp/simlinux/drivers/SConscript
@@ -12,8 +12,8 @@ if GetDepend('RT_USING_DFS') == False or GetDepend('RT_USING_MTD_NAND') == False
     SrcRemove(src, 'nanddrv_file.c')
 if GetDepend('RT_USING_DFS') == False or GetDepend('RT_USING_MTD_NOR') == False:
     SrcRemove(src, 'sst25vfxx_mtd_sim.c')
-if GetDepend('RT_USING_SERIAL') == False:
-    SrcRemove(src, 'usart_sim.c')
+#if GetDepend('RT_USING_SERIAL') == False:
+#    SrcRemove(src, 'usart_sim.c')
 
 CPPPATH = [cwd]
 
diff --git a/bsp/simlinux/drivers/board.c b/bsp/simlinux/drivers/board.c
index 5506acb55d17b0695fd146ada8b65ce16004751d..1ece5c8831e9628583557a3853d7c07d3adaae14 100755
--- a/bsp/simlinux/drivers/board.c
+++ b/bsp/simlinux/drivers/board.c
@@ -53,15 +53,16 @@ void rt_hw_win32_low_cpu(void)
 #endif
 }
 
-#if defined(RT_USING_FINSH)
-
+#ifdef _WIN32
 #ifndef _CRT_TERMINATE_DEFINED
 #define _CRT_TERMINATE_DEFINED
 _CRTIMP __declspec(noreturn) void __cdecl exit(__in int _Code);
 _CRTIMP __declspec(noreturn) void __cdecl _exit(__in int _Code);
 _CRTIMP void __cdecl abort(void);
 #endif
+#endif
 
+#if defined(RT_USING_FINSH)
 #include <finsh.h>
 void rt_hw_exit(void)
 {
@@ -79,9 +80,9 @@ void rt_hw_board_init()
     /* init system memory */
     heap = rt_hw_sram_init();
 
-#if defined(RT_USING_USART)
+//#if defined(RT_USING_USART)
     rt_hw_usart_init();
-#endif
+//#endif
 
 #if defined(RT_USING_CONSOLE)
     rt_hw_serial_init();
diff --git a/bsp/simlinux/drivers/usart_sim.c b/bsp/simlinux/drivers/usart_sim.c
index 6a2564786a6abc42d5f4c4a0664697d0c6d725f0..5331f346798dd6a896944a84d90b1fe76c53956c 100755
--- a/bsp/simlinux/drivers/usart_sim.c
+++ b/bsp/simlinux/drivers/usart_sim.c
@@ -4,16 +4,16 @@
 #ifdef _WIN32
 #include  <windows.h>
 #include  <mmsystem.h>
+#include  <conio.h>
 #endif
 
 #include  <stdio.h>
-#include  <conio.h>
-
 #include "serial.h"
 
 struct serial_int_rx serial_rx;
 extern struct rt_device serial_device;
 
+#ifdef _WIN32
 /*
  * Handler for OSKey Thread
  */
@@ -23,7 +23,6 @@ static DWORD        OSKey_ThreadID;
 static DWORD WINAPI ThreadforKeyGet(LPVOID lpParam);
 void rt_hw_usart_init(void)
 {
-
     /*
      * create serial thread that receive key input from keyboard
      */
@@ -50,9 +49,52 @@ void rt_hw_usart_init(void)
      * Start OS get key Thread
      */
     ResumeThread(OSKey_Thread);
+}
+
+#else /* POSIX version */
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <stdlib.h>
+#include <termios.h> /* for tcxxxattr, ECHO, etc */
+#include <unistd.h> /* for STDIN_FILENO */
+
+/*simulate windows' getch(), it works!!*/
+int getch(void) 
+{
+    int ch;
+    struct termios oldt, newt;
+
+	// get terminal input's attribute
+    tcgetattr(STDIN_FILENO, &oldt);
+    newt = oldt;
 
+	//set termios' local mode
+    newt.c_lflag &= ~(ECHO|ICANON);
+    tcsetattr(STDIN_FILENO, TCSANOW, &newt);
+
+	//read character from terminal input
+    ch = getchar();
+
+	//recover terminal's attribute
+    tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
+
+    return ch;
 }
 
+static void * ThreadforKeyGet(void * lpParam);
+static pthread_t OSKey_Thread;
+void rt_hw_usart_init(void)
+{
+    int res;
+    res = pthread_create(&OSKey_Thread, NULL, &ThreadforKeyGet, NULL);
+    if (res)
+    {
+        printf("pthread create faild, <%d>\n", res);
+        exit(EXIT_FAILURE);
+    }
+}
+#endif
 /*
  * ·½Ïò¼ü(¡û)£º 0xe04b
  * ·½Ïò¼ü(¡ü)£º 0xe048
@@ -104,7 +146,11 @@ static int savekey(unsigned char key)
     }
     return 0;
 }
+#ifdef _WIN32
 static DWORD WINAPI ThreadforKeyGet(LPVOID lpParam)
+#else
+static void * ThreadforKeyGet(void * lpParam)
+#endif
 {
     unsigned char key;
 
diff --git a/bsp/simlinux/rtconfig.h b/bsp/simlinux/rtconfig.h
index ae213813ecf7ba2fcb7d5430ff84054bd586ecc8..fcbda8a2a439873c1f1034f232144f09bc9ef712 100755
--- a/bsp/simlinux/rtconfig.h
+++ b/bsp/simlinux/rtconfig.h
@@ -101,7 +101,7 @@
 /* #define RT_USING_MTD_NOR */
 
 /* SECTION: finsh, a C-Express shell */
-/* #define RT_USING_FINSH */
+#define RT_USING_FINSH
 /* Using symbol table */
 #define FINSH_USING_SYMTAB
 #define FINSH_USING_DESCRIPTION
diff --git a/libcpu/sim/posix/cpu_port.c b/libcpu/sim/posix/cpu_port.c
index e3dea83eee7ae9b98abdd94ff403ec3945dfdaeb..6d2b517cfff22effc9fe3d0b91c7408c4d3c40d1 100644
--- a/libcpu/sim/posix/cpu_port.c
+++ b/libcpu/sim/posix/cpu_port.c
@@ -1,7 +1,7 @@
 /*
  * author : prife (goprife@gmail.com)
  * date   : 2013/01/14 01:18:50
- * version: v 0.1.0
+ * version: v 0.2.0
  */
 #include <rtthread.h>
 #include <stdio.h>