diff --git a/cpu/mpc85xx/pci.c b/cpu/mpc85xx/pci.c
index 7a8184a..fedf1a5 100644
--- a/cpu/mpc85xx/pci.c
+++ b/cpu/mpc85xx/pci.c
@@ -35,10 +35,18 @@
 #define CONFIG_SYS_PCI1_MEM_BUS CONFIG_SYS_PCI1_MEM_BASE
 #endif
 
+#ifndef CONFIG_SYS_PCI1_IO_BUS
+#define CONFIG_SYS_PCI1_IO_BUS CONFIG_SYS_PCI1_IO_BASE
+#endif
+
 #ifndef CONFIG_SYS_PCI2_MEM_BUS
 #define CONFIG_SYS_PCI2_MEM_BUS CONFIG_SYS_PCI2_MEM_BASE
 #endif
 
+#ifndef CONFIG_SYS_PCI2_IO_BUS
+#define CONFIG_SYS_PCI2_IO_BUS CONFIG_SYS_PCI2_IO_BASE
+#endif
+
 static struct pci_controller *pci_hose;
 
 void
@@ -95,7 +103,7 @@
 	pcix->powar1 = (POWAR_EN | POWAR_MEM_READ |
 			POWAR_MEM_WRITE | (__ilog2(CONFIG_SYS_PCI1_MEM_SIZE) - 1));
 
-	pcix->potar2  = (CONFIG_SYS_PCI1_IO_BASE >> 12) & 0x000fffff;
+	pcix->potar2  = (CONFIG_SYS_PCI1_IO_BUS >> 12) & 0x000fffff;
 	pcix->potear2  = 0x00000000;
 	pcix->powbar2  = (CONFIG_SYS_PCI1_IO_PHYS >> 12) & 0x000fffff;
 	pcix->powbear2 = 0x00000000;
@@ -119,7 +127,7 @@
 		       PCI_REGION_MEM);
 
 	pci_set_region(hose->regions + 1,
-		       CONFIG_SYS_PCI1_IO_BASE,
+		       CONFIG_SYS_PCI1_IO_BUS,
 		       CONFIG_SYS_PCI1_IO_PHYS,
 		       CONFIG_SYS_PCI1_IO_SIZE,
 		       PCI_REGION_IO);
@@ -180,7 +188,7 @@
 	pcix2->powar1 = (POWAR_EN | POWAR_MEM_READ |
 			POWAR_MEM_WRITE | (__ilog2(CONFIG_SYS_PCI2_MEM_SIZE) - 1));
 
-	pcix2->potar2  = (CONFIG_SYS_PCI2_IO_BASE >> 12) & 0x000fffff;
+	pcix2->potar2  = (CONFIG_SYS_PCI2_IO_BUS >> 12) & 0x000fffff;
 	pcix2->potear2  = 0x00000000;
 	pcix2->powbar2  = (CONFIG_SYS_PCI2_IO_PHYS >> 12) & 0x000fffff;
 	pcix2->powbear2 = 0x00000000;
@@ -204,7 +212,7 @@
 		       PCI_REGION_MEM);
 
 	pci_set_region(hose->regions + 1,
-		       CONFIG_SYS_PCI2_IO_BASE,
+		       CONFIG_SYS_PCI2_IO_BUS,
 		       CONFIG_SYS_PCI2_IO_PHYS,
 		       CONFIG_SYS_PCI2_IO_SIZE,
 		       PCI_REGION_IO);