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There are some Linux supported platforms that simply cannot hit the low I/O addresses used by ATA legacy mode PCI mappings. These platforms have a window for PCI space that is fixed by the board logic and doesn't include the neccessary locations. Provide a config option so that such platforms faced with a controller that they cannot support simply error it and punt Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>