D20144.diff
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	Index: head/sys/dev/ahci/ahci_generic.c
	===================================================================
	--- head/sys/dev/ahci/ahci_generic.c
	+++ head/sys/dev/ahci/ahci_generic.c
	@@ -89,6 +89,7 @@
	static int
	ahci_acpi_probe(device_t dev)
	{
	+ struct ahci_controller *ctlr = device_get_softc(dev);
	ACPI_HANDLE h;

	if ((h = acpi_get_handle(dev)) == NULL)
	@@ -98,6 +99,12 @@
	pci_get_subclass(dev) == PCIS_STORAGE_SATA &&
	pci_get_progif(dev) == PCIP_STORAGE_SATA_AHCI_1_0) {
	device_set_desc_copy(dev, "AHCI SATA controller");
	+ if (ACPI_FAILURE(acpi_GetInteger(h, "_CCA",
	+ &ctlr->dma_coherent)))
	+ ctlr->dma_coherent = 0;
	+ if (bootverbose)
	+ device_printf(dev, "Bus is%s cache-coherent\n",
	+ ctlr->dma_coherent ? "" : " not");
	return (BUS_PROBE_DEFAULT);
	}