diff --git a/bsp/mini2440/lcd_a70.c b/bsp/mini2440/lcd_a70.c
index 933423a6fd3a21d8d362334d56d2ff1026685386..fe459487339e36f40acb161f5ace9cb41c237196 100644
--- a/bsp/mini2440/lcd_a70.c
+++ b/bsp/mini2440/lcd_a70.c
@@ -111,6 +111,7 @@
 
 #define	S3C2410_LCDINT_FRSYNC	(1<<1)
 
+volatile rt_uint16_t _rt_framebuffer[RT_HW_LCD_HEIGHT][RT_HW_LCD_WIDTH];
 volatile rt_uint16_t _rt_hw_framebuffer[RT_HW_LCD_HEIGHT][RT_HW_LCD_WIDTH];
 
 void lcd_power_enable(int invpwren,int pwren)
@@ -170,19 +171,34 @@ void LcdBkLtSet(rt_uint32_t HiRatio)
 
 void rt_hw_lcd_update(rtgui_rect_t *rect)
 {
-	/* nothing */
+	rt_uint16_t *src_ptr, *dst_ptr;
+	rt_uint32_t pitch, index;
+
+	pitch = 2 * (rect->x2 - rect->x1);
+
+	/* copy from framebuffer to physical framebuffer */
+	src_ptr = &_rt_framebuffer[rect->x1][rect->y1];
+	dst_ptr = &_rt_hw_framebuffer[rect->x1][rect->y1];
+
+	for (index = rect->y1; index < rect->y2; index ++)
+	{
+		memcpy(dst_ptr, src_ptr, pitch);
+
+		src_ptr += (rect->x2 - rect->x1);
+		dst_ptr += (rect->x2 - rect->x1);
+	}
 }
 
 rt_uint8_t * rt_hw_lcd_get_framebuffer(void)
 {
-	return (rt_uint8_t *)_rt_hw_framebuffer;
+	return (rt_uint8_t *)_rt_framebuffer;
 }
 
 void rt_hw_lcd_set_pixel(rtgui_color_t *c, rt_base_t x, rt_base_t y)
 {
     if (x < RT_HW_LCD_WIDTH && y < RT_HW_LCD_HEIGHT)
 	{
-		_rt_hw_framebuffer[(y)][(x)] = rtgui_color_to_565p(*c);
+		_rt_framebuffer[(y)][(x)] = rtgui_color_to_565p(*c);
 	}
 }
 
@@ -190,7 +206,7 @@ void rt_hw_lcd_get_pixel(rtgui_color_t *c, rt_base_t x, rt_base_t y)
 {
     if (x < RT_HW_LCD_WIDTH && y < RT_HW_LCD_HEIGHT)
 	{
-		*c = rtgui_color_from_565p(_rt_hw_framebuffer[(y)][(x)]);
+		*c = rtgui_color_from_565p(_rt_framebuffer[(y)][(x)]);
 	}
 
     return ;
@@ -206,7 +222,7 @@ void rt_hw_lcd_draw_hline(rtgui_color_t *c, rt_base_t x1, rt_base_t x2, rt_base_
 
 	for (idx = x1; idx < x2; idx ++)
 	{
-		_rt_hw_framebuffer[y][idx] = color;
+		_rt_framebuffer[y][idx] = color;
 	}
 }
 
@@ -220,13 +236,13 @@ void rt_hw_lcd_draw_vline(rtgui_color_t *c, rt_base_t x, rt_base_t y1, rt_base_t
 
 	for (idy = y1; idy < y2; idy ++)
 	{
-		_rt_hw_framebuffer[idy][x] = color;
+		_rt_framebuffer[idy][x] = color;
 	}
 }
 
 void rt_hw_lcd_draw_raw_hline(rt_uint8_t *pixels, rt_base_t x1, rt_base_t x2, rt_base_t y)
 {
-    rt_memcpy((void*)&_rt_hw_framebuffer[y][x1], pixels, (x2 - x1) * 2);
+    rt_memcpy((void*)&_rt_framebuffer[y][x1], pixels, (x2 - x1) * 2);
 }
 
 struct rtgui_graphic_driver _rtgui_lcd_driver =
diff --git a/bsp/mini2440/lcd_n35.c b/bsp/mini2440/lcd_n35.c
index c867659556d4bbe2c9b1de73abd58fc9571a9a50..b135048234155f0a2b46410bc213f62f869d871d 100644
--- a/bsp/mini2440/lcd_n35.c
+++ b/bsp/mini2440/lcd_n35.c
@@ -111,6 +111,7 @@
 
 #define	S3C2410_LCDINT_FRSYNC	(1<<1)
 
+volatile rt_uint16_t _rt_framebuffer[RT_HW_LCD_HEIGHT][RT_HW_LCD_WIDTH];
 volatile rt_uint16_t _rt_hw_framebuffer[RT_HW_LCD_HEIGHT][RT_HW_LCD_WIDTH];
 
 void lcd_power_enable(int invpwren,int pwren)
@@ -170,19 +171,34 @@ void LcdBkLtSet(rt_uint32_t HiRatio)
 
 void rt_hw_lcd_update(rtgui_rect_t *rect)
 {
-	/* nothing */
+	rt_uint16_t *src_ptr, *dst_ptr;
+	rt_uint32_t pitch, index;
+
+	pitch = 2 * (rect->x2 - rect->x1);
+
+	/* copy from framebuffer to physical framebuffer */
+	src_ptr = &_rt_framebuffer[rect->x1][rect->y1];
+	dst_ptr = &_rt_hw_framebuffer[rect->x1][rect->y1];
+
+	for (index = rect->y1; index < rect->y2; index ++)
+	{
+		memcpy(dst_ptr, src_ptr, pitch);
+
+		src_ptr += (rect->x2 - rect->x1);
+		dst_ptr += (rect->x2 - rect->x1);
+	}
 }
 
 rt_uint8_t * rt_hw_lcd_get_framebuffer(void)
 {
-	return (rt_uint8_t *)_rt_hw_framebuffer;
+	return (rt_uint8_t *)_rt_framebuffer;
 }
 
 void rt_hw_lcd_set_pixel(rtgui_color_t *c, rt_base_t x, rt_base_t y)
 {
     if (x < RT_HW_LCD_WIDTH && y < RT_HW_LCD_HEIGHT)
 	{
-		_rt_hw_framebuffer[(y)][(x)] = rtgui_color_to_565p(*c);
+		_rt_framebuffer[(y)][(x)] = rtgui_color_to_565p(*c);
 	}
 }
 
@@ -190,7 +206,7 @@ void rt_hw_lcd_get_pixel(rtgui_color_t *c, rt_base_t x, rt_base_t y)
 {
     if (x < RT_HW_LCD_WIDTH && y < RT_HW_LCD_HEIGHT)
 	{
-		*c = rtgui_color_from_565p(_rt_hw_framebuffer[(y)][(x)]);
+		*c = rtgui_color_from_565p(_rt_framebuffer[(y)][(x)]);
 	}
 
     return ;
@@ -206,7 +222,7 @@ void rt_hw_lcd_draw_hline(rtgui_color_t *c, rt_base_t x1, rt_base_t x2, rt_base_
 
 	for (idx = x1; idx < x2; idx ++)
 	{
-		_rt_hw_framebuffer[y][idx] = color;
+		_rt_framebuffer[y][idx] = color;
 	}
 }
 
@@ -220,13 +236,13 @@ void rt_hw_lcd_draw_vline(rtgui_color_t *c, rt_base_t x, rt_base_t y1, rt_base_t
 
 	for (idy = y1; idy < y2; idy ++)
 	{
-		_rt_hw_framebuffer[idy][x] = color;
+		_rt_framebuffer[idy][x] = color;
 	}
 }
 
 void rt_hw_lcd_draw_raw_hline(rt_uint8_t *pixels, rt_base_t x1, rt_base_t x2, rt_base_t y)
 {
-    rt_memcpy((void*)&_rt_hw_framebuffer[y][x1], pixels, (x2 - x1) * 2);
+    rt_memcpy((void*)&_rt_framebuffer[y][x1], pixels, (x2 - x1) * 2);
 }
 
 struct rtgui_graphic_driver _rtgui_lcd_driver =
diff --git a/bsp/mini2440/lcd_t35.c b/bsp/mini2440/lcd_t35.c
index a9f5d1f716ca957d7d8970ce720a5b51385b873c..75816b2ea61a36720011d4d1d9039449b1d3ba4e 100644
--- a/bsp/mini2440/lcd_t35.c
+++ b/bsp/mini2440/lcd_t35.c
@@ -111,6 +111,7 @@
 
 #define	S3C2410_LCDINT_FRSYNC	(1<<1)
 
+volatile rt_uint16_t _rt_framebuffer[RT_HW_LCD_HEIGHT][RT_HW_LCD_WIDTH];
 volatile rt_uint16_t _rt_hw_framebuffer[RT_HW_LCD_HEIGHT][RT_HW_LCD_WIDTH];
 
 void lcd_power_enable(int invpwren,int pwren)
@@ -170,19 +171,34 @@ void LcdBkLtSet(rt_uint32_t HiRatio)
 
 void rt_hw_lcd_update(rtgui_rect_t *rect)
 {
-	/* nothing */
+	rt_uint16_t *src_ptr, *dst_ptr;
+	rt_uint32_t pitch, index;
+
+	pitch = 2 * (rect->x2 - rect->x1);
+
+	/* copy from framebuffer to physical framebuffer */
+	src_ptr = &_rt_framebuffer[rect->x1][rect->y1];
+	dst_ptr = &_rt_hw_framebuffer[rect->x1][rect->y1];
+
+	for (index = rect->y1; index < rect->y2; index ++)
+	{
+		memcpy(dst_ptr, src_ptr, pitch);
+
+		src_ptr += (rect->x2 - rect->x1);
+		dst_ptr += (rect->x2 - rect->x1);
+	}
 }
 
 rt_uint8_t * rt_hw_lcd_get_framebuffer(void)
 {
-	return (rt_uint8_t *)_rt_hw_framebuffer;
+	return (rt_uint8_t *)_rt_framebuffer;
 }
 
 void rt_hw_lcd_set_pixel(rtgui_color_t *c, rt_base_t x, rt_base_t y)
 {
     if (x < RT_HW_LCD_WIDTH && y < RT_HW_LCD_HEIGHT)
 	{
-		_rt_hw_framebuffer[(y)][(x)] = rtgui_color_to_565p(*c);
+		_rt_framebuffer[(y)][(x)] = rtgui_color_to_565p(*c);
 	}
 }
 
@@ -190,7 +206,7 @@ void rt_hw_lcd_get_pixel(rtgui_color_t *c, rt_base_t x, rt_base_t y)
 {
     if (x < RT_HW_LCD_WIDTH && y < RT_HW_LCD_HEIGHT)
 	{
-		*c = rtgui_color_from_565p(_rt_hw_framebuffer[(y)][(x)]);
+		*c = rtgui_color_from_565p(_rt_framebuffer[(y)][(x)]);
 	}
 
     return ;
@@ -206,7 +222,7 @@ void rt_hw_lcd_draw_hline(rtgui_color_t *c, rt_base_t x1, rt_base_t x2, rt_base_
 
 	for (idx = x1; idx < x2; idx ++)
 	{
-		_rt_hw_framebuffer[y][idx] = color;
+		_rt_framebuffer[y][idx] = color;
 	}
 }
 
@@ -220,13 +236,13 @@ void rt_hw_lcd_draw_vline(rtgui_color_t *c, rt_base_t x, rt_base_t y1, rt_base_t
 
 	for (idy = y1; idy < y2; idy ++)
 	{
-		_rt_hw_framebuffer[idy][x] = color;
+		_rt_framebuffer[idy][x] = color;
 	}
 }
 
 void rt_hw_lcd_draw_raw_hline(rt_uint8_t *pixels, rt_base_t x1, rt_base_t x2, rt_base_t y)
 {
-    rt_memcpy((void*)&_rt_hw_framebuffer[y][x1], pixels, (x2 - x1) * 2);
+    rt_memcpy((void*)&_rt_framebuffer[y][x1], pixels, (x2 - x1) * 2);
 }
 
 struct rtgui_graphic_driver _rtgui_lcd_driver =