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The name NullDmaLib suggests that this library is a placeholder that only exists to fulfil formal dependencies on the DmaLib library class without providing an actual implementation. This is not the case, though: NullDmaLib does implement DmaLib fully, but doing so simply requires very little effort on a cache coherent platform. So let's rename it to CoherentDmaLib instead. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>