Re: Enabling boot menu via serial & PXE boot in CorebootPayloadPkg

["You, Benjamin" <benjamin.you@intel.com>]

Hi Cameron,

CorebootPayloadPkg does support serial output as user interface. To enable
serial, the CorebootPayloadPkg retrieves serial information from Coreboot 
through CorebootModulePkg\Library\CbParseLib\CbParseLib.c => 
CbParseSerialInfo(), which is called by CorebootPayloadPkg\Library\
PlatformHookLib\PlatformHookLib.c => PlatformHookSerialPortInitialize(), 
which is in turn called by CorebootModulePkg\Library\BaseSerialPortLib16550
\BaseSerialPortLib16550.c ==> SerialPortInitialize(). 

Have you seen serial output info during Coreboot? If the answer is no, then 
Coreboot should be tweaked. If the answer is yes, but you cannot see serial
output in Coreboot Payload, then probably the above call sequence needs to 
be checked. If you do not have a debugger, one way to trace code flow is to
insert raw serial outputs in the code flow. This should be doable since 
Coreboot already does serial output. Once the serial output functions
correctly in the Coreboot Payload, Boot Menu / UI through serial should be 
automatically supported.

On networking, you might refer to the Minnow Board v3 source tree, at
https://github.com/tianocore/edk2-platforms/tree/devel-MinnowBoard3-UDK2017

Minnow Board v3 uses the same SOC as Leaf Hill. You might look at 
Platform/BroxtonPlatformPkg/PlatformPkg.fdf file for a reference on which 
components are used for network / PXE.

Thanks,

- ben

> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> Cameron Craig
> Sent: Friday, November 24, 2017 5:16 PM
> To: 'edk2-devel@lists.01.org' <edk2-devel@lists.01.org>
> Subject: [edk2] Enabling boot menu via serial & PXE boot in CorebootPayloadPkg
> 
> 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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