diff --git a/arch/arm/src/lpc2378/internal.h b/arch/arm/src/lpc2378/internal.h
index 5a0e63b621..47bf8b7f57 100644
--- a/arch/arm/src/lpc2378/internal.h
+++ b/arch/arm/src/lpc2378/internal.h
@@ -14,14 +14,14 @@
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
- *	notice, this list of conditions and the following disclaimer.
+ *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
- *	notice, this list of conditions and the following disclaimer in
- *	the documentation and/or other materials provided with the
- *	distribution.
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
  * 3. Neither the name NuttX nor the names of its contributors may be
- *	used to endorse or promote products derived from this software
- *	without specific prior written permission.
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@@ -61,8 +61,8 @@
 #ifndef __ASSEMBLY__
 
 #ifdef CONFIG_ARCH_LEDS
-extern void up_statledoff(void);
-extern void up_statledon(void);
+extern void lpc2378_statledoff(void);
+extern void lpc2378_statledon(void);
 #endif
 
 #endif
diff --git a/arch/arm/src/lpc2378/lpc23xx_irq.c b/arch/arm/src/lpc2378/lpc23xx_irq.c
index 96e94c4546..24ed2e7a91 100644
--- a/arch/arm/src/lpc2378/lpc23xx_irq.c
+++ b/arch/arm/src/lpc2378/lpc23xx_irq.c
@@ -58,7 +58,7 @@
 #include "lpc23xx_vic.h"
 
 /****************************************************************************
- * Definitions
+ * Pre-processor Definitions
  ****************************************************************************/
 
 /****************************************************************************
@@ -121,22 +121,24 @@ void up_irqinitialize(void)
  * VIC registers can be accessed in User or privileged mode
  ***********************************************************************/
 
+#if 0 /* Not used */
 static void up_enable_irq_protect(void)
 {
-  // ~ uint32_t reg32 = vic_getreg(VIC_PROTECTION_OFFSET);
-  // ~ reg32 &= ~(0xFFFFFFFF);
   vic_putreg(0x01, VIC_PROTECTION_OFFSET);
 }
+#endif
 
 /***********************************************************************
  * Name: up_disable_irq_protect
  * VIC registers can only be accessed in privileged mode
  ***********************************************************************/
 
+#if 0 /* Not used */
 static void up_disable_irq_protect(void)
 {
   vic_putreg(0, VIC_PROTECTION_OFFSET);
 }
+#endif
 
 /***********************************************************************
  * Name: up_disable_irq
@@ -227,17 +229,21 @@ void up_maskack_irq(int irq)
  * MOD
  ****************************************************************************/
 
+#ifdef CONFIG_ARCH_IRQPRIO
 int up_prioritize_irq(int irq, int priority)
 {
   /* The default priority on reset is 16 */
+
   if (irq < NR_IRQS && priority > 0 && priority < 16)
     {
       int offset = irq << 2;
       vic_putreg(priority, VIC_VECTPRIORITY0_OFFSET + offset);
       return OK;
     }
+
   return -EINVAL;
 }
+#endif
 
 /****************************************************************************
  * Name: up_attach_vector
@@ -262,11 +268,13 @@ void up_attach_vector(int irq, int vector, vic_vector_t handler)
 
       /* Save the vector address */
 
-      vic_putreg((uint32_t) handler, VIC_VECTADDR0_OFFSET + offset);
+      vic_putreg((uint32_t)handler, VIC_VECTADDR0_OFFSET + offset);
 
+#ifdef CONFIG_ARCH_IRQPRIO
       /* Set the interrupt priority */
 
-      up_prioritize_irq(irq, vector);
+      up_prioritize_irq(irq, PRIORITY_HIGHEST);
+#endif
 
       /* Enable the vectored interrupt */
 
diff --git a/arch/arm/src/lpc2378/lpc23xx_serial.c b/arch/arm/src/lpc2378/lpc23xx_serial.c
index fbbebf51b7..a7fce97395 100644
--- a/arch/arm/src/lpc2378/lpc23xx_serial.c
+++ b/arch/arm/src/lpc2378/lpc23xx_serial.c
@@ -537,17 +537,13 @@ static int up_attach(struct uart_dev_s *dev)
 
       up_enable_irq(priv->irq);
 
-      /* Set the uart interrupt priority (the default value is one) */
-      if (priv->uartbase == UART0_BASE_ADDR)
-        {
-          up_prioritize_irq(priv->irq, PRIORITY_LOWEST);
-        }
-      else if (priv->uartbase == UART2_BASE_ADDR)
-        {
-          up_prioritize_irq(priv->irq, 10);
-        }
+#ifdef CONFIG_ARCH_IRQPRIO
+      /* Set the UART interrupt priority */
 
+      up_prioritize_irq(priv->irq, PRIORITY_HIGHEST);
+#endif
     }
+
   return ret;
 }
 
diff --git a/arch/arm/src/lpc2378/lpc23xx_timerisr.c b/arch/arm/src/lpc2378/lpc23xx_timerisr.c
index d9e63d6d6e..6027bfcd2a 100644
--- a/arch/arm/src/lpc2378/lpc23xx_timerisr.c
+++ b/arch/arm/src/lpc2378/lpc23xx_timerisr.c
@@ -127,10 +127,12 @@ int up_timerisr(int irq, uint32_t * regs)
   if (tick++ > 100)
     {
       tick = 0;
-      up_statledoff();
+      lpc2378_statledoff();
     }
   else
-    up_statledon();
+    {
+      lpc2378_statledon();
+    }
 
   return 0;
 }
@@ -190,10 +192,12 @@ void up_timerinit(void)
   /* Attach the timer interrupt vector */
 
 #ifdef CONFIG_VECTORED_INTERRUPTS
-  up_attach_vector(IRQ_SYSTIMER, PRIORITY_HIGHEST, (vic_vector_t) up_timerisr);
+  up_attach_vector(IRQ_SYSTIMER, ???, (vic_vector_t) up_timerisr);
 #else
   (void)irq_attach(IRQ_SYSTIMER, (xcpt_t) up_timerisr);
+#ifdef CONFIG_ARCH_IRQPRIO
   up_prioritize_irq(IRQ_SYSTIMER, PRIORITY_HIGHEST);
+#endif
 #endif
 
   /* And enable the system timer interrupt */