diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
index 815c29163e1d..231234c8d113 100644
--- a/arch/ia64/sn/kernel/io_acpi_init.c
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -430,7 +430,7 @@ sn_acpi_slot_fixup(struct pci_dev *dev)
 	struct pcidev_info *pcidev_info = NULL;
 	struct sn_irq_info *sn_irq_info = NULL;
 	struct resource *res;
-	size_t image_size, size;
+	size_t size;
 
 	if (sn_acpi_get_pcidev_info(dev, &pcidev_info, &sn_irq_info)) {
 		panic("%s:  Failure obtaining pcidev_info for %s\n",
@@ -444,13 +444,17 @@ sn_acpi_slot_fixup(struct pci_dev *dev)
 		 * of the shadowed copy, and the actual length of the ROM image.
 		 */
 		size = pci_resource_len(dev, PCI_ROM_RESOURCE);
-		addr = ioremap(pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE],
-			       size);
-		image_size = pci_get_rom_size(dev, addr, size);
+
 		res = &dev->resource[PCI_ROM_RESOURCE];
-		res->start = (unsigned long) addr;
-		res->end = (unsigned long) addr + image_size - 1;
-		res->flags |= IORESOURCE_ROM_BIOS_COPY;
+
+		pci_disable_rom(dev);
+		if (res->parent)
+			release_resource(res);
+
+		res->start = pcidev_info->pdi_pio_mapped_addr[PCI_ROM_RESOURCE];
+		res->end = res->start + size - 1;
+		res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
+			     IORESOURCE_PCI_FIXED;
 	}
 	sn_pci_fixup_slot(dev, pcidev_info, sn_irq_info);
 }
diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 0227e202b6bb..c15a41e2d1f2 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -185,8 +185,7 @@ sn_io_slot_fixup(struct pci_dev *dev)
 		if (size == 0)
 			continue;
 
-		res->start = ioremap(pcidev_info->pdi_pio_mapped_addr[idx],
-				     size + 1);
+		res->start = pcidev_info->pdi_pio_mapped_addr[idx];
 		res->end = addr + size;
 
 		/*
@@ -201,18 +200,12 @@ sn_io_slot_fixup(struct pci_dev *dev)
 		else
 			insert_resource(&iomem_resource, res);
 		/*
-		 * If ROM, set the actual ROM image size, and mark as
-		 * shadowed in PROM.
+		 * If ROM, mark as shadowed in PROM.
 		 */
 		if (idx == PCI_ROM_RESOURCE) {
-			size_t image_size;
-			void __iomem *rom;
-
-			rom = ioremap(pci_resource_start(dev, PCI_ROM_RESOURCE),
-				      size + 1);
-			image_size = pci_get_rom_size(dev, rom, size + 1);
-			res->end = res->start + image_size - 1;
-			res->flags |= IORESOURCE_ROM_BIOS_COPY;
+			pci_disable_rom(dev);
+			res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW |
+				     IORESOURCE_PCI_FIXED;
 		}
 	}