diff --git a/arch/arm/mach-ixp23xx/core.c b/arch/arm/mach-ixp23xx/core.c
index 092ee12ced425dcfaaff125a4f8f4cc3324c85c3..affd1d5d744049c44c19d8214d74478317ccc672 100644
--- a/arch/arm/mach-ixp23xx/core.c
+++ b/arch/arm/mach-ixp23xx/core.c
@@ -178,8 +178,12 @@ static int ixp23xx_irq_set_type(unsigned int irq, unsigned int type)
 
 static void ixp23xx_irq_mask(unsigned int irq)
 {
-	volatile unsigned long *intr_reg = IXP23XX_INTR_EN1 + (irq / 32);
+	volatile unsigned long *intr_reg;
 
+	if (irq >= 56)
+		irq += 8;
+
+	intr_reg = IXP23XX_INTR_EN1 + (irq / 32);
 	*intr_reg &= ~(1 << (irq % 32));
 }
 
@@ -199,17 +203,25 @@ static void ixp23xx_irq_ack(unsigned int irq)
  */
 static void ixp23xx_irq_level_unmask(unsigned int irq)
 {
-	volatile unsigned long *intr_reg = IXP23XX_INTR_EN1 + (irq / 32);
+	volatile unsigned long *intr_reg;
 
 	ixp23xx_irq_ack(irq);
 
+	if (irq >= 56)
+		irq += 8;
+
+	intr_reg = IXP23XX_INTR_EN1 + (irq / 32);
 	*intr_reg |= (1 << (irq % 32));
 }
 
 static void ixp23xx_irq_edge_unmask(unsigned int irq)
 {
-	volatile unsigned long *intr_reg = IXP23XX_INTR_EN1 + (irq / 32);
+	volatile unsigned long *intr_reg;
+
+	if (irq >= 56)
+		irq += 8;
 
+	intr_reg = IXP23XX_INTR_EN1 + (irq / 32);
 	*intr_reg |= (1 << (irq % 32));
 }
 
diff --git a/include/asm-arm/arch-ixp23xx/memory.h b/include/asm-arm/arch-ixp23xx/memory.h
index 6e19f46d54d1c2aaf947aca24fdc01c4569390fc..c85fc06a043c10dc00392d72b3ef726aa40eece9 100644
--- a/include/asm-arm/arch-ixp23xx/memory.h
+++ b/include/asm-arm/arch-ixp23xx/memory.h
@@ -49,7 +49,7 @@ static inline int __ixp23xx_arch_is_coherent(void)
 {
 	extern unsigned int processor_id;
 
-	if (((processor_id & 15) >= 2) || machine_is_roadrunner())
+	if (((processor_id & 15) >= 4) || machine_is_roadrunner())
 		return 1;
 
 	return 0;