Sean Cross 49e1eb19c0 emulation: connect EC ...

Connect the EC to the SoC. This allows for emulating both the EC and SoC
in tandem. Messages flow via a 16-bit bus. When data is not available,
`0xdddd` is returned.

There is a HOLD line that goes from the EC to the SoC. This is tied to
the inverse of presence of data in the EC FIFO -- when it's empty, HOLD
is `1`, and when there is data it's `0`.

Signed-off-by: Sean Cross <sean@xobs.io>

2022-02-14 12:28:40 +08:00

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