diff --git a/include/asm-i386/ide.h b/include/asm-i386/ide.h
index 859ebf4..79dfab8 100644
--- a/include/asm-i386/ide.h
+++ b/include/asm-i386/ide.h
@@ -41,13 +41,17 @@
 
 static __inline__ unsigned long ide_default_io_base(int index)
 {
+	if (pci_find_device(PCI_ANY_ID, PCI_ANY_ID, NULL) == NULL) {
+		switch(index) {
+			case 2: return 0x1e8;
+			case 3: return 0x168;
+			case 4: return 0x1e0;
+			case 5: return 0x160;
+		}
+	}
 	switch (index) {
 		case 0:	return 0x1f0;
 		case 1:	return 0x170;
-		case 2: return 0x1e8;
-		case 3: return 0x168;
-		case 4: return 0x1e0;
-		case 5: return 0x160;
 		default:
 			return 0;
 	}