This adds a working Ethernet implementation based on the WF200. It
currently gets connected to a Linux machine running a udhcpd server,
however it could also get connected to a TUN/TAP connection on Linux or
Mac.
Signed-off-by: Sean Cross <sean@xobs.io>
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>
