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

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

Hi Benjamin,

Thanks for the pointers.

>> 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.

Network boot/PXE is now functioning, I just had to link in the UNDI driver in edk2 rather than loading via USB.

It's just the serial boot menu I'm trying to get working now.

>BTW, please use debug build for Coreboot Payload, such that debug
>information can be shown in serial console from the very early stage in the
>Payload's execution. This would help validating the functioning of serial.

Interestingly, my debug build was complaining that it ran out of room when attempting to fit everything in the UEFIPAYLOAD.
When I strip out the network additions and keep DEBUG on, Tianocore builds but errors at runtime:
```
Failed to add memory space :0xFEE00000 0x100000
```
I'm guessing I can increase the size of a region somewhere to avoid this issue?

>> 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.

I get serial output from coreboot and edk2, just not the boot menu.

>> 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.

That's not happening in my case. I'm currently trying to get the debug build to run.

Cheers,
Cameron



Cameron Craig | Graduate Software Engineer | Exterity Limited
tel: +44 1383 828 250 | fax:  | mobile:
e: Cameron.Craig@exterity.com | w: www.exterity.com



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