Index: sys/dev/puc/puc.c
===================================================================
--- sys/dev/puc/puc.c	(revision 263038)
+++ sys/dev/puc/puc.c	(working copy)
@@ -34,6 +34,7 @@
 #include <sys/conf.h>
 #include <sys/malloc.h>
 #include <sys/mutex.h>
+#include <sys/sysctl.h>
 
 #include <machine/bus.h>
 #include <machine/resource.h>
@@ -70,6 +71,8 @@
 
 static MALLOC_DEFINE(M_PUC, "PUC", "PUC driver");
 
+SYSCTL_NODE(_hw, OID_AUTO, puc, CTLFLAG_RD, 0, "puc(9) driver configuration");
+
 struct puc_bar *
 puc_get_bar(struct puc_softc *sc, int rid)
 {
@@ -324,7 +327,6 @@
 	if (bootverbose && sc->sc_ilr != 0)
 		device_printf(dev, "using interrupt latch register\n");
 
-	sc->sc_irid = 0;
 	sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid,
 	    RF_ACTIVE|RF_SHAREABLE);
 	if (sc->sc_ires != NULL) {
Index: sys/dev/puc/puc_bfe.h
===================================================================
--- sys/dev/puc/puc_bfe.h	(revision 263038)
+++ sys/dev/puc/puc_bfe.h	(working copy)
@@ -66,6 +66,7 @@
 	int		sc_fastintr:1;
 	int		sc_leaving:1;
 	int		sc_polled:1;
+	int		sc_msi:1;
 
 	int		sc_ilr;
 
@@ -94,4 +95,6 @@
     driver_filter_t *, driver_intr_t *, void *, void **);
 int puc_bus_teardown_intr(device_t, device_t, struct resource *, void *);
 
+SYSCTL_DECL(_hw_puc);
+
 #endif /* _DEV_PUC_BFE_H_ */
Index: sys/dev/puc/puc_cfg.c
===================================================================
--- sys/dev/puc/puc_cfg.c	(revision 263038)
+++ sys/dev/puc/puc_cfg.c	(working copy)
@@ -31,6 +31,7 @@
 #include <sys/systm.h>
 #include <sys/bus.h>
 #include <sys/rman.h>
+#include <sys/sysctl.h>
 
 #include <dev/puc/puc_bus.h>
 #include <dev/puc/puc_cfg.h>
Index: sys/dev/puc/puc_pccard.c
===================================================================
--- sys/dev/puc/puc_pccard.c	(revision 263038)
+++ sys/dev/puc/puc_pccard.c	(working copy)
@@ -34,6 +34,7 @@
 #include <sys/bus.h>
 #include <sys/conf.h>
 #include <sys/malloc.h>
+#include <sys/sysctl.h>
 
 #include <machine/bus.h>
 #include <machine/resource.h>
Index: sys/dev/puc/puc_pci.c
===================================================================
--- sys/dev/puc/puc_pci.c	(revision 263038)
+++ sys/dev/puc/puc_pci.c	(working copy)
@@ -67,6 +67,7 @@
 #include <sys/bus.h>
 #include <sys/conf.h>
 #include <sys/malloc.h>
+#include <sys/sysctl.h>
 
 #include <machine/bus.h>
 #include <machine/resource.h>
@@ -78,6 +79,11 @@
 #include <dev/puc/puc_cfg.h>
 #include <dev/puc/puc_bfe.h>
 
+static int puc_msi_disable;
+TUNABLE_INT("hw.puc.msi_disable", &puc_msi_disable);
+SYSCTL_INT(_hw_puc, OID_AUTO, msi_disable, CTLFLAG_RD | CTLFLAG_TUN,
+    &puc_msi_disable, 0, "Disable use of MSI interrupts by puc(9)");
+
 static const struct puc_cfg *
 puc_pci_match(device_t dev, const struct puc_cfg *desc)
 {
@@ -120,11 +126,56 @@
 	return (puc_bfe_probe(dev, desc));
 }
 
+static int
+puc_pci_attach(device_t dev)
+{
+	struct puc_softc *sc;
+	int error, count;
+
+	sc = device_get_softc(dev);
+
+	if (!puc_msi_disable) {
+		count = 1;
+
+		if (pci_alloc_msi(dev, &count) == 0) {
+			sc->sc_msi = 1;
+			sc->sc_irid = 1;
+		}
+	}
+
+	error = puc_bfe_attach(dev);
+
+	if (error != 0 && sc->sc_msi)
+		pci_release_msi(dev);
+
+	return (error);
+}
+
+static int
+puc_pci_detach(device_t dev)
+{
+	struct puc_softc *sc;
+	int error;
+
+	sc = device_get_softc(dev);
+	
+	error = puc_bfe_detach(dev);
+
+	if (error != 0)
+		return (error);
+
+	if (sc->sc_msi)
+		error = pci_release_msi(dev);
+
+	return (error);
+}
+
+
 static device_method_t puc_pci_methods[] = {
     /* Device interface */
     DEVMETHOD(device_probe,		puc_pci_probe),
-    DEVMETHOD(device_attach,		puc_bfe_attach),
-    DEVMETHOD(device_detach,		puc_bfe_detach),
+    DEVMETHOD(device_attach,		puc_pci_attach),
+    DEVMETHOD(device_detach,		puc_pci_detach),
 
     DEVMETHOD(bus_alloc_resource,	puc_bus_alloc_resource),
     DEVMETHOD(bus_release_resource,	puc_bus_release_resource),
Index: sys/dev/puc/pucdata.c
===================================================================
--- sys/dev/puc/pucdata.c	(revision 263038)
+++ sys/dev/puc/pucdata.c	(working copy)
@@ -36,6 +36,7 @@
 #include <sys/systm.h>
 #include <sys/kernel.h>
 #include <sys/bus.h>
+#include <sys/sysctl.h>
 
 #include <machine/resource.h>
 #include <machine/bus.h>