Enabling boot menu via serial & PXE boot in CorebootPayloadPkg

[Cameron Craig <Cameron.Craig@exterity.com>]

Hi all,

I'm new to this list and new to edk2 integration.
Currently I'm working on an Intel Leaf Hill CRB, attempting to produce a coreboot payload consisting of a Tianocore EDKII UDK 2017 UEFI boot manager.

I have basic functionality, but a few useful features are currently missing from my build:

1. User interface via serial.
We will not have the luxury of a video output so need to be able to navigate the boot menu etc. via serial.
In an ideal world I would be looking for a Boolean value to toggle :) But I imagine there might be a little more to it.

2. PXE Boot.
So far I have sources and built an UNDI driver and pinged a local network device.
I have also attempted to enable the necessary features for PXE boot [1].
But I get an error message:
```
$ ipconfig
MAC Address: <valid MAC addr>
Broadcast MAC: FF FF FF FF FF FF
ipconfig: Locate protocol error: 'PXE base code protocol'
```
So I'm thinking some drivers are not being loaded?

Any suggestions for enabling these features would be greatly appreciated.

[1] https://github.com/tianocore/tianocore.github.io/wiki/NetworkPkg-Getting-Started-Guide -> FEATURES ENABLING

Cheers,
Cameron


Cameron Craig | Graduate Software Engineer | Exterity Limited
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