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[efi] Make EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL optional
Some UEFI systems (observed with a Hyper-V virtual machine) do not provide EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL. Make this an optional protocol (and fail any attempts to access PCI configuration space via the root bridge if the protocol is missing). Reported-by: Colin Blacker <Colin.Blacker@computerplanet.co.uk> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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