Index: ata-pci.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/ata/ata-pci.c,v
retrieving revision 1.105.2.6
diff -u -r1.105.2.6 ata-pci.c
--- ata-pci.c	9 Nov 2007 09:58:08 -0000	1.105.2.6
+++ ata-pci.c	11 Nov 2007 15:58:07 -0000
@@ -212,6 +212,17 @@
 	ctlr->r_rid1 = ATA_BMADDR_RID;
 	ctlr->r_res1 = bus_alloc_resource_any(dev, ctlr->r_type1, &ctlr->r_rid1,
 					      RF_ACTIVE);
+	/* ARNO some bios + TX4 claim memio iso portio */
+	if ( (ctlr->r_res1 == NULL) && (ctlr->chip->chipid == ATA_PDC40718) ) {
+	    device_printf(dev,
+	        " ARNO TX4 fails ioport for rid %#x\n"
+	        "      retry with memio .. \n", ATA_BMADDR_RID);
+	    ctlr->r_type1 = SYS_RES_MEMORY;
+	    ctlr->r_res1 = bus_alloc_resource_any(dev, ctlr->r_type1,
+				 &ctlr->r_rid1, RF_ACTIVE);
+	    if  (ctlr->r_res1 == NULL) device_printf(dev, " ARNO memio KO\n");
+	    else device_printf(dev, " ARNO memio OK!\n");
+	}
     }
 
     if (ctlr->chipinit(dev))