The ARM calling convention is fundamentally incompatible with EBC, and having a cross compatible machine type identical to the native type does not make a lot of sense either. So restrict the compatible machine type for ARM to EFI_IMAGE_MACHINE_ARMTHUMB_MIXED, and remove the cross compatible. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Liming Gao <liming.gao@intel.com>