D38920.diff
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	diff --git a/sys/arm64/arm64/ofw_machdep.c b/sys/arm64/arm64/ofw_machdep.c
	--- a/sys/arm64/arm64/ofw_machdep.c
	+++ b/sys/arm64/arm64/ofw_machdep.c
	@@ -43,7 +43,8 @@
	{
	bus_addr_t addr;
	bus_size_t size;
	- int err;
	+ phandle_t parent;
	+ int err, flags;

	err = ofw_reg_to_paddr(dev, regno, &addr, &size, NULL);
	if (err != 0)
	@@ -54,5 +55,10 @@
	if (sz != NULL)
	*sz = size;

	- return (bus_space_map(*tag, addr, size, 0, handle));
	+ flags = 0;
	+ parent = OF_parent(dev);
	+ if (parent > 0 && OF_hasprop(parent, "nonposted-mmio"))
	+ flags \|= BUS_SPACE_MAP_NONPOSTED;
	+
	+ return (bus_space_map(*tag, addr, size, flags, handle));
	}