Attention is currently required from: Alper Nebi Yasak, Arthur Heymans, Julius Werner, ron minnich.

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• File src/device/Kconfig:

  • Patch Set #5, Line 532: CPU communicate with peripheral devices over PCI I/O space.

    > Port I/O is a concept completely specific to the x86 architecture, it doesn't make sense on Arm. […]

    There's definitely PCI hardware in the world that would need it. However,
    I couldn't tell if coreboot would ever see such real hardware, or only
    emulated one (and then we could just choose to emulate something else?).

    Maybe we should make this a broader discussion about how much PCI we want
    to support on non-x86? AFAICT, qemu-aarch64, qcom and mtk already partially
    implement PCI i/o support. Should we move ahead or back? IMHO, it wouldn't
    be much of a burden to go ahead.

    Julius, about the API, maybe you could try to see it more abstract like
    this: there's something that requires special instructions on x86, but can
    be done with MMIO on reasonable platforms. With this in mind would any-
    thing be wrong with the current API?

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