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Neither the EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL nor the EFI_CPU_IO2_PROTOCOL impose any restrictions when it comes to the range of valid I/O addresses. Even so, the 'mm' command in -IO mode refuses to perform accesses to addresses >= 0xffff. It is not up to 'mm' to impose this restriction, so remove it. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>