diff --git a/sys/dev/pci/pci_host_generic.c b/sys/dev/pci/pci_host_generic.c
--- a/sys/dev/pci/pci_host_generic.c
+++ b/sys/dev/pci/pci_host_generic.c
@@ -59,6 +59,12 @@
 #define	PCI_RF_FLAGS	0
 #endif
 
+/*
+ * We allocate "ranges" specified mappings higher up in the rid space to avoid
+ * conflicts with various definitions in the wild that may have other registers
+ * attributed to the controller besides just the config space.
+ */
+#define	RANGE_RID(idx)	((idx) + 100)
 
 /* Forward prototypes */
 
@@ -173,7 +179,7 @@
 		phys_base = sc->ranges[tuple].phys_base;
 		pci_base = sc->ranges[tuple].pci_base;
 		size = sc->ranges[tuple].size;
-		rid = tuple + 1;
+		rid = RANGE_RID(tuple);
 		if (size == 0)
 			continue; /* empty range element */
 		switch (FLAG_TYPE(sc->ranges[tuple].flags)) {
@@ -238,9 +244,9 @@
 			continue;
 		}
 		if (sc->ranges[tuple].res != NULL)
-			bus_release_resource(dev, type, tuple + 1,
+			bus_release_resource(dev, type, RANGE_RID(tuple),
 			    sc->ranges[tuple].res);
-		bus_delete_resource(dev, type, tuple + 1);
+		bus_delete_resource(dev, type, RANGE_RID(tuple));
 	}
 	rman_fini(&sc->io_rman);
 err_io_rman:
@@ -285,9 +291,9 @@
 			continue;
 		}
 		if (sc->ranges[tuple].res != NULL)
-			bus_release_resource(dev, type, tuple + 1,
+			bus_release_resource(dev, type, RANGE_RID(tuple),
 			    sc->ranges[tuple].res);
-		bus_delete_resource(dev, type, tuple + 1);
+		bus_delete_resource(dev, type, RANGE_RID(tuple));
 	}
 	rman_fini(&sc->io_rman);
 	rman_fini(&sc->mem_rman);