D29625.diff
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	diff --git a/sys/dev/pci/pci_dw.c b/sys/dev/pci/pci_dw.c
	--- a/sys/dev/pci/pci_dw.c
	+++ b/sys/dev/pci/pci_dw.c
	@@ -342,6 +342,18 @@
	" Not all required ranges are found in DT\n");
	return (ENXIO);
	}
	+ if (sc->io_range.size > UINT32_MAX) {
	+ device_printf(sc->dev,
	+ "ATU IO window size is too large. Up to 4GB windows "
	+ "are supported, trimming window size to 4GB\n");
	+ sc->io_range.size = UINT32_MAX;
	+ }
	+ if (sc->mem_range.size > UINT32_MAX) {
	+ device_printf(sc->dev,
	+ "ATU MEM window size is too large. Up to 4GB windows "
	+ "are supported, trimming window size to 4GB\n");
	+ sc->mem_range.size = UINT32_MAX;
	+ }
	return (0);
	}