diff --git a/arch/x86/cpu/queensbay/tnc.c b/arch/x86/cpu/queensbay/tnc.c
index 873de7be9d..d27b2d9ec6 100644
--- a/arch/x86/cpu/queensbay/tnc.c
+++ b/arch/x86/cpu/queensbay/tnc.c
@@ -69,17 +69,18 @@ void cpu_irq_init(void)
 	 * Route TunnelCreek PCI device interrupt pin to PIRQ
 	 *
 	 * Since PCIe downstream ports received INTx are routed to PIRQ
-	 * A/B/C/D directly and not configurable, we route internal PCI
-	 * device's INTx to PIRQ E/F/G/H.
+	 * A/B/C/D directly and not configurable, we have to route PCIe
+	 * root ports' INTx to PIRQ A/B/C/D as well. For other devices
+	 * on TunneCreek, route them to PIRQ E/F/G/H.
 	 */
 	writew(PIRQE, &rcba->d02ir);
 	writew(PIRQF, &rcba->d03ir);
 	writew(PIRQG, &rcba->d27ir);
 	writew(PIRQH, &rcba->d31ir);
-	writew(PIRQE, &rcba->d23ir);
-	writew(PIRQF, &rcba->d24ir);
-	writew(PIRQG, &rcba->d25ir);
-	writew(PIRQH, &rcba->d26ir);
+	writew(PIRQA, &rcba->d23ir);
+	writew(PIRQB, &rcba->d24ir);
+	writew(PIRQC, &rcba->d25ir);
+	writew(PIRQD, &rcba->d26ir);
 }
 
 int arch_misc_init(void)
diff --git a/arch/x86/dts/crownbay.dts b/arch/x86/dts/crownbay.dts
index b77c65a463..60da1f544b 100644
--- a/arch/x86/dts/crownbay.dts
+++ b/arch/x86/dts/crownbay.dts
@@ -169,10 +169,22 @@
 				/* TunnelCreek PCI devices */
 				PCI_BDF(0, 2, 0) INTA PIRQE
 				PCI_BDF(0, 3, 0) INTA PIRQF
-				PCI_BDF(0, 23, 0) INTA PIRQE
-				PCI_BDF(0, 24, 0) INTA PIRQF
-				PCI_BDF(0, 25, 0) INTA PIRQG
-				PCI_BDF(0, 26, 0) INTA PIRQH
+				PCI_BDF(0, 23, 0) INTA PIRQA
+				PCI_BDF(0, 23, 0) INTB PIRQB
+				PCI_BDF(0, 23, 0) INTC PIRQC
+				PCI_BDF(0, 23, 0) INTD PIRQD
+				PCI_BDF(0, 24, 0) INTA PIRQB
+				PCI_BDF(0, 24, 0) INTB PIRQC
+				PCI_BDF(0, 24, 0) INTC PIRQD
+				PCI_BDF(0, 24, 0) INTD PIRQA
+				PCI_BDF(0, 25, 0) INTA PIRQC
+				PCI_BDF(0, 25, 0) INTB PIRQD
+				PCI_BDF(0, 25, 0) INTC PIRQA
+				PCI_BDF(0, 25, 0) INTD PIRQB
+				PCI_BDF(0, 26, 0) INTA PIRQD
+				PCI_BDF(0, 26, 0) INTB PIRQA
+				PCI_BDF(0, 26, 0) INTC PIRQB
+				PCI_BDF(0, 26, 0) INTD PIRQC
 				PCI_BDF(0, 27, 0) INTA PIRQG
 				/*
 				 * Topcliff PCI devices