Index: sys/x86/x86/io_apic.c
===================================================================
--- sys/x86/x86/io_apic.c
+++ sys/x86/x86/io_apic.c
@@ -94,7 +94,7 @@
 struct ioapic {
 	struct pic io_pic;
 	u_int io_id:8;			/* logical ID */
-	u_int io_apic_id:4;
+	u_int io_apic_id:8;
 	u_int io_intbase:8;		/* System Interrupt base */
 	u_int io_numintr:8;
 	u_int io_haseoi:1;
@@ -1023,8 +1023,9 @@
 	mtx_unlock_spin(&icu_lock);
 	if (bootverbose)
 		device_printf(dev,
-		    "cannot match pci bar apic id %d against MADT\n",
-		    apic_id);
+		    "cannot match pci bar apic id %d against MADT, "
+		    "BAR0 %#jx io id %d\n",
+		    apic_id, (uintmax_t)rman_get_start(res), apic_id);
 fail:
 	bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
 	return (ENXIO);