D35631.diff
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	diff --git a/sys/arm64/acpica/OsdEnvironment.c b/sys/arm64/acpica/OsdEnvironment.c
	--- a/sys/arm64/acpica/OsdEnvironment.c
	+++ b/sys/arm64/acpica/OsdEnvironment.c
	@@ -60,6 +60,16 @@
	{
	long acpi_root;

	+ if (TUNABLE_ULONG_FETCH("acpi.rsdp", &acpi_root))
	+ return (acpi_root);
	+
	+ /*
	+ * The hints mechanism is unreliable (it fails if anybody ever
	+ * compiled in hints to the kernel). It has been replaced
	+ * by the tunable method, but is used here as a fallback to
	+ * retain maximum compatibility between old loaders and new
	+ * kernels. It can be removed after 14.0R.
	+ */
	if (resource_long_value("acpi", 0, "rsdp", &acpi_root) == 0)
	return (acpi_root);