diff --git a/libcpu/arm/lpc214x/serial.c b/libcpu/arm/lpc214x/serial.c
deleted file mode 100644
index e8f7a49cb4..0000000000
--- a/libcpu/arm/lpc214x/serial.c
+++ /dev/null
@@ -1,387 +0,0 @@
-/*
- * File      : serial.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006, RT-Thread Development Team
- *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://openlab.rt-thread.com/license/LICENSE
- *
- * Change Logs:
- * Date           Author       Notes
- * 2006-08-23     Bernard      first version
- */
-
-#include <rthw.h>
-#include <rtthread.h>
-
-#include "lpc214x.h"
-#include "board.h"
-
-/* serial hardware register */
-#define REG8(d)			(*((volatile unsigned char *)(d)))
-#define REG32(d)		(*((volatile unsigned long *)(d)))
-
-#define UART_RBR(base)  REG8(base + 0x00)
-#define UART_THR(base)  REG8(base + 0x00)
-#define UART_IER(base)  REG32(base + 0x04)
-#define UART_IIR(base)  REG32(base + 0x08)
-#define UART_FCR(base)  REG8(base + 0x08)
-#define UART_LCR(base)  REG8(base + 0x0C)
-#define UART_MCR(base)  REG8(base + 0x10)
-#define UART_LSR(base)  REG8(base + 0x14)
-#define UART_MSR(base)  REG8(base + 0x18)
-#define UART_SCR(base)  REG8(base + 0x1C)
-#define UART_DLL(base)  REG8(base + 0x00)
-#define UART_DLM(base)  REG8(base + 0x04)
-#define UART_ACR(base)  REG32(base + 0x20)
-#define UART_FDR(base)  REG32(base + 0x28)
-#define UART_TER(base)  REG8(base + 0x30)
-
-/* LPC serial device */
-struct rt_lpcserial
-{
-	/* inherit from device */
-	struct rt_device parent;
-
-	rt_uint32_t hw_base;
-	rt_uint32_t irqno;
-	rt_uint32_t baudrate;
-
-	/* reception field */
-	rt_uint16_t save_index, read_index;
-	rt_uint8_t  rx_buffer[RT_UART_RX_BUFFER_SIZE];
-};
-
-#ifdef RT_USING_UART1
-struct rt_lpcserial serial1;
-#endif
-#ifdef RT_USING_UART2
-struct rt_lpcserial serial2;
-#endif
-
-void rt_hw_serial_init(void);
-
-#define U0PINS  	0x00000005
-
-void rt_hw_uart_isr(struct rt_lpcserial* lpc_serial)
-{
-	UNUSED rt_uint32_t iir;
-
-	RT_ASSERT(lpc_serial != RT_NULL)
-		
-	if (UART_LSR(lpc_serial->hw_base) & 0x01)
-	{
-		rt_base_t level;
-
-		while (UART_LSR(lpc_serial->hw_base) & 0x01)
-		{
-			/* disable interrupt */
-			level = rt_hw_interrupt_disable();
-
-			/* read character */
-			lpc_serial->rx_buffer[lpc_serial->save_index] = 
-				UART_RBR(lpc_serial->hw_base);
-			lpc_serial->save_index ++;
-			if (lpc_serial->save_index >= RT_UART_RX_BUFFER_SIZE)
-				lpc_serial->save_index = 0;
-			
-			/* if the next position is read index, discard this 'read char' */
-			if (lpc_serial->save_index == lpc_serial->read_index)
-			{
-				lpc_serial->read_index ++;
-				if (lpc_serial->read_index >= RT_UART_RX_BUFFER_SIZE)
-					lpc_serial->read_index = 0;
-			}
-
-			/* enable interrupt */
-			rt_hw_interrupt_enable(level);
-		}
-
-		/* invoke callback */
-		if(lpc_serial->parent.rx_indicate != RT_NULL)
-		{
-		  lpc_serial->parent.rx_indicate(&lpc_serial->parent, 1);
-		}
-	}
-
-	/* clear interrupt source */
-	iir = UART_IIR(lpc_serial->hw_base);
-
-	/* acknowledge Interrupt */
-	VICVectAddr = 0;
-}
-
-#ifdef RT_USING_UART1
-void rt_hw_uart_isr_1(int irqno)
-{
-	/* get lpc serial device */
-	rt_hw_uart_isr(&serial1);
-}	
-#endif
-
-#ifdef RT_USING_UART2
-void rt_hw_uart_isr_2(int irqno)
-{
-	/* get lpc serial device */
-	rt_hw_uart_isr(&serial2);
-}	
-#endif
-
-/**
- * @addtogroup LPC214x
- */
-/*@{*/
-
-static rt_err_t rt_serial_init (rt_device_t dev)
-{
-	return RT_EOK;
-}
-
-static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
-{
-	struct rt_lpcserial* lpc_serial;
-	lpc_serial = (struct rt_lpcserial*) dev;
-	
-	RT_ASSERT(lpc_serial != RT_NULL);
-	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
-	{
-	    /* init UART rx interrupt */
-    	UART_IER(lpc_serial->hw_base) = 0x01;
-
-		/* install ISR */
-		if (lpc_serial->irqno == UART0_INT)
-		{
-#ifdef RT_USING_UART1
-		    rt_hw_interrupt_install(lpc_serial->irqno, rt_hw_uart_isr_1, RT_NULL);
-#endif
-		}
-		else
-		{
-#ifdef RT_USING_UART2
-		    rt_hw_interrupt_install(lpc_serial->irqno, rt_hw_uart_isr_2, RT_NULL);
-#endif
-		}
-
-	    rt_hw_interrupt_umask(lpc_serial->irqno);
-	}
-
-	return RT_EOK;
-}
-
-static rt_err_t rt_serial_close(rt_device_t dev)
-{
-	struct rt_lpcserial* lpc_serial;
-	lpc_serial = (struct rt_lpcserial*) dev;
-	
-	RT_ASSERT(lpc_serial != RT_NULL);
-
-	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
-	{
-		/* disable UART rx interrupt */
-		UART_IER(lpc_serial->hw_base) = 0x00;
-	}
-
-	return RT_EOK;
-}
-
-static rt_err_t rt_serial_control(rt_device_t dev, rt_uint8_t cmd, void *args)
-{
-	return RT_EOK;
-}
-
-static rt_size_t rt_serial_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
-{
-	rt_uint8_t* ptr;
-	struct rt_lpcserial *lpc_serial = (struct rt_lpcserial*)dev;
-	RT_ASSERT(lpc_serial != RT_NULL);
-
-	/* point to buffer */
-	ptr = (rt_uint8_t*) buffer;
-
-	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
-	{
-		while (size)
-		{
-			/* interrupt receive */
-			rt_base_t level;
-
-			/* disable interrupt */
-			level = rt_hw_interrupt_disable();
-			if (lpc_serial->read_index != lpc_serial->save_index)
-			{
-				*ptr = lpc_serial->rx_buffer[lpc_serial->read_index];
-
-				lpc_serial->read_index ++;
-				if (lpc_serial->read_index >= RT_UART_RX_BUFFER_SIZE)
-					lpc_serial->read_index = 0;
-			}
-			else
-			{
-				/* no data in rx buffer */
-
-				/* enable interrupt */
-				rt_hw_interrupt_enable(level);
-				break;
-			}
-
-			/* enable interrupt */
-			rt_hw_interrupt_enable(level);
-
-			ptr ++; size --;
-		}
-
-		return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
-	}
-	else if (dev->flag & RT_DEVICE_FLAG_DMA_RX)
-	{
-		/* not support right now */
-		RT_ASSERT(0);
-	}
-
-	/* polling mode */
-	while (size && (UART_LSR(lpc_serial->hw_base) & 0x01))
-	{
-		/* Read Character */
-		*ptr = UART_RBR(lpc_serial->hw_base);
-		
-		ptr  ++;
-		size --;
-	}
-
-	return (rt_size_t)ptr - (rt_size_t)buffer;
-}
-
-static rt_size_t rt_serial_write(rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
-{
-	struct rt_lpcserial* lpc_serial;
-	char *ptr;
-
-	lpc_serial = (struct rt_lpcserial*) dev;
-	if (dev->flag & RT_DEVICE_FLAG_INT_TX)
-	{
-		/* not support */
-		RT_ASSERT(0);
-	}
-	else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
-	{
-		/* not support */
-		RT_ASSERT(0);
-	}
-
-	/* polling write */
-	ptr = (char *)buffer;
-	
-	if (dev->flag & RT_DEVICE_FLAG_STREAM)
-	{
-		/* stream mode */
-		while (size)
-		{
-			if (*ptr == '\n')
-			{
-				while (!(UART_LSR(lpc_serial->hw_base) & 0x20));
-				UART_THR(lpc_serial->hw_base) = '\r';
-			}
-
-			while (!(UART_LSR(lpc_serial->hw_base) & 0x20));
-			UART_THR(lpc_serial->hw_base) = *ptr;
-			
-			ptr ++;
-			size --;
-		}
-	}
-	else
-	{
-		while (size)
-		{
-			while (!(UART_LSR(lpc_serial->hw_base) & 0x20));
-			UART_THR(lpc_serial->hw_base) = *ptr;
-			
-			ptr ++;
-			size --;
-		}
-	}
-	
-	return (rt_size_t) ptr - (rt_size_t) buffer;
-}
-
-void rt_hw_serial_init(void)
-{
-	struct rt_lpcserial* lpc_serial;
-	
-#ifdef RT_USING_UART1
-	lpc_serial = &serial1;
-	
-	lpc_serial->parent.type = RT_Device_Class_Char;
-	
-	lpc_serial->hw_base = 0xE000C000;
-	lpc_serial->baudrate = 115200;
-	lpc_serial->irqno = UART0_INT;
-	
-	rt_memset(lpc_serial->rx_buffer, 0, sizeof(lpc_serial->rx_buffer));
-	lpc_serial->read_index = lpc_serial->save_index = 0;
-
-	/* Enable UART0 RxD and TxD pins */
-  	PINSEL0 |= 0x05;
-
-	/* 8 bits, no Parity, 1 Stop bit */
-	UART_LCR(lpc_serial->hw_base) = 0x83;
-	
-	/* Setup Baudrate */
-	UART_DLL(lpc_serial->hw_base) = (PCLK/16/lpc_serial->baudrate) & 0xFF;
-	UART_DLM(lpc_serial->hw_base) = ((PCLK/16/lpc_serial->baudrate) >> 8) & 0xFF;
-
-	/* DLAB = 0 */
-	UART_LCR(lpc_serial->hw_base) = 0x03;
-
-	lpc_serial->parent.init 	= rt_serial_init;
-	lpc_serial->parent.open 	= rt_serial_open;
-	lpc_serial->parent.close    = rt_serial_close;
-	lpc_serial->parent.read 	= rt_serial_read;
-	lpc_serial->parent.write    = rt_serial_write;
-	lpc_serial->parent.control  = rt_serial_control;
-	lpc_serial->parent.user_data  = RT_NULL;
-
-	rt_device_register(&lpc_serial->parent, 
-		"uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
-#endif
-
-#ifdef RT_USING_UART2
-	lpc_serial = &serial2;
-	
-	lpc_serial->parent.type = RT_Device_Class_Char;
-
-	lpc_serial->hw_base = 0xE0010000;
-	lpc_serial->baudrate = 115200;
-	lpc_serial->irqno = UART1_INT;
-
-	rt_memset(lpc_serial->rx_buffer, 0, sizeof(lpc_serial->rx_buffer));
-	lpc_serial->read_index = lpc_serial->save_index = 0;
-
-	/* Enable UART1 RxD and TxD pins */
-  	PINSEL0 |= 0x05 << 16;
-
-	/* 8 bits, no Parity, 1 Stop bit */
-	UART_LCR(lpc_serial->hw_base) = 0x83;
-	
-	/* Setup Baudrate */
-	UART_DLL(lpc_serial->hw_base) = (PCLK/16/lpc_serial->baudrate) & 0xFF;
-	UART_DLM(lpc_serial->hw_base) = ((PCLK/16/lpc_serial->baudrate) >> 8) & 0xFF;
-
-	/* DLAB = 0 */
-	UART_LCR(lpc_serial->hw_base) = 0x03;
-
-	lpc_serial->parent.init 	= rt_serial_init;
-	lpc_serial->parent.open 	= rt_serial_open;
-	lpc_serial->parent.close    = rt_serial_close;
-	lpc_serial->parent.read 	= rt_serial_read;
-	lpc_serial->parent.write    = rt_serial_write;
-	lpc_serial->parent.control  = rt_serial_control;
-	lpc_serial->parent.user_data  = RT_NULL;
-
-	rt_device_register(&lpc_serial->parent, 
-		"uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
-#endif
-}
-
-/*@}*/