diff --git a/bsp/lpc2478/drivers/board.c b/bsp/lpc2478/drivers/board.c
index 1ddc0aaf79..ac17305062 100644
--- a/bsp/lpc2478/drivers/board.c
+++ b/bsp/lpc2478/drivers/board.c
@@ -37,7 +37,7 @@ void rt_timer_handler(int vector, void* param)
 /**
  * This function will init LPC2478 board
  */
-void rt_hw_board_init()
+void rt_hw_board_init(void)
 {
 #if defined(RT_USING_DEVICE) && defined(RT_USING_UART1)
 	rt_hw_serial_init();
diff --git a/bsp/lpc2478/drivers/serial.c b/bsp/lpc2478/drivers/serial.c
index a5edc3c988..8a0e1aa15b 100644
--- a/bsp/lpc2478/drivers/serial.c
+++ b/bsp/lpc2478/drivers/serial.c
@@ -64,9 +64,10 @@ void rt_hw_serial_init(void);
 
 #define U0PINS  	0x00000005
 
-void rt_hw_uart_isr(struct rt_lpcserial* lpc_serial)
+void rt_hw_uart_isr(int irqno, void *param)
 {
 	UNUSED rt_uint32_t iir;
+	struct rt_lpcserial* lpc_serial = (struct rt_lpcserial*)param;
 
 	RT_ASSERT(lpc_serial != RT_NULL)
 		
@@ -112,21 +113,6 @@ void rt_hw_uart_isr(struct rt_lpcserial* lpc_serial)
 	VICVectAddr = 0;
 }
 
-#ifdef RT_USING_UART1
-void rt_hw_uart_isr_1(int irqno, void* param)
-{
-	/* get lpc serial device */
-	rt_hw_uart_isr(&serial1);
-}	
-#endif
-
-#ifdef RT_USING_UART2
-void rt_hw_uart_isr_2(int irqno, void* param)
-{
-	/* get lpc serial device */
-	rt_hw_uart_isr(&serial2);
-}	
-#endif
 
 /**
  * @addtogroup LPC214x
@@ -150,19 +136,8 @@ static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
     	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, "uart1");
-#endif
-		}
-		else
-		{
-#ifdef RT_USING_UART2
-		    rt_hw_interrupt_install(lpc_serial->irqno, rt_hw_uart_isr_2, RT_NULL, "uart2");
-#endif
-		}
-
+	    rt_hw_interrupt_install(lpc_serial->irqno,
+                                rt_hw_uart_isr, lpc_serial, RT_NULL);
 	    rt_hw_interrupt_umask(lpc_serial->irqno);
 	}
 
diff --git a/libcpu/arm/lpc24xx/interrupt.c b/libcpu/arm/lpc24xx/interrupt.c
index 6d64d7a07c..16d1dd7e99 100644
--- a/libcpu/arm/lpc24xx/interrupt.c
+++ b/libcpu/arm/lpc24xx/interrupt.c
@@ -10,8 +10,10 @@
  * Change Logs:
  * Date           Author       Notes
  * 2008-12-11     XuXinming    first version
+ * 2013-03-29     aozima       Modify the interrupt interface implementations.
  */
 
+#include <rtthread.h>
 #include <rthw.h>
 #include "LPC24xx.h"
 
@@ -35,7 +37,7 @@ void rt_hw_interrupt_handler(int vector, void *param)
 	rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
 }
 
-void rt_hw_interrupt_init()
+void rt_hw_interrupt_init(void)
 {
 	register int i;
 
@@ -47,10 +49,10 @@ void rt_hw_interrupt_init()
 	VICIntSelect = 0;
 
     /* init exceptions table */
+    rt_memset(irq_desc, 0x00, sizeof(irq_desc));
     for(i=0; i < MAX_HANDLERS; i++)
     {
-        irq_desc[i].handler = (rt_isr_handler_t)rt_hw_interrupt_handler;
-        irq_desc[i].param = RT_NULL;
+        irq_desc[i].handler = rt_hw_interrupt_handler;
 
 		vect_addr  = (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + i*4);
 		vect_cntl  = (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + i*4);
@@ -94,7 +96,7 @@ rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
 		old_handler = irq_desc[vector].handler;
 		if (handler != RT_NULL)
 		{
-			irq_desc[vector].handler = (rt_isr_handler_t)handler;
+			irq_desc[vector].handler = handler;
 			irq_desc[vector].param = param;
 		}
 	}
diff --git a/libcpu/arm/lpc24xx/trap.c b/libcpu/arm/lpc24xx/trap.c
index 53ff13b4eb..71d88101fc 100644
--- a/libcpu/arm/lpc24xx/trap.c
+++ b/libcpu/arm/lpc24xx/trap.c
@@ -126,7 +126,7 @@ void rt_hw_trap_resv(struct rt_hw_register *regs)
 }
 
 extern rt_isr_handler_t isr_table[];
-void rt_hw_trap_irq()
+void rt_hw_trap_irq(void)
 {
 	int irqno;
 	struct rt_irq_desc* irq;
@@ -139,7 +139,7 @@ void rt_hw_trap_irq()
 	irq->handler(irqno, irq->param);
 }
 
-void rt_hw_trap_fiq()
+void rt_hw_trap_fiq(void)
 {	
     rt_kprintf("fast interrupt request\n");
 }