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Testing a driver on the host requires the hardware to be

  • A.behind an interface that can be substituted
  • B.simulated in full detail down to the register level
  • C.connected to the host over a debug probe
  • D.described in a hardware description language

Answer: A

If the driver reaches registers directly it cannot be built for the host at all, whereas a thin abstraction can be replaced by a stub that records what was written. Designing for that substitution is one of the practical benefits of a hardware abstraction layer.

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