D43922.id.diff
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D43922.id.diff
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	diff --git a/sys/dev/pci/pci_pci.c b/sys/dev/pci/pci_pci.c
	--- a/sys/dev/pci/pci_pci.c
	+++ b/sys/dev/pci/pci_pci.c
	@@ -437,6 +437,24 @@
	if (!pcib_is_window_open(w))
	return;

	+ /*
	+ * Assume that a window where both the base and limit read as
	+ * zero is not really open, or at least not assigned a valid
	+ * range by the firmware. This can happen if a bridge device
	+ * is never initialized by firmware, or if a platform driver
	+ * resets the bridge.
	+ *
	+ * If devices behind this bridge have firmware-assigned
	+ * resources in this range then the window will be reallocated
	+ * on-demand.
	+ */
	+ if (w->base == 0 && w->limit == ((pci_addr_t)1 << w->step) - 1) {
	+ w->base = max_address;
	+ w->limit = 0;
	+ pcib_write_windows(sc, w->mask);
	+ return;
	+ }
	+
	if (w->base > max_address \|\| w->limit > max_address) {
	device_printf(sc->dev,
	"initial %s window has too many bits, ignoring\n", w->name);