Re: GOP Console Driver

[Jd Lyons <lyons_dj@yahoo.com>]

> On Aug 19, 2018, at 7:46 AM, Marvin Häuser <Marvin.Haeuser@outlook.com> wrote:
> 
> boot.efi requires a GOP instance to be present on gST->ConOutHandle, which Mac EFI installs via ConSplitter.
> I know that Windows UEFI boot is not officially supported for such old models, however I'm not aware of the technical reasons - I think Windows should support UGA.
> Shell is also trial&error with old Macs, I think I heard a modded EDK Shell once worked. As for finding out boot.efi's issues, I would just shim the most crucial Boot Services (especially HandleProtocol()) and protocol inputs and outputs.
> 
> Regards,
> Marvin
> 

Thanks Marvin, I suppose my Mac Pro doesn’t do gST>ConOutHandle for my GOP video card, I could try and replace the console splitter DXE in my firmware, but I’d like to try and test it first.

I extracted the ConsoleSplitter from OVMF and tried to load it via a shell on the Mac Pro, however the system just freezes when I issue the load command for this driver. Not completely unexpected as there is already a loaded console splitter. I’m not sure if there would be a way to test this, other than just replacing Apple’s console Splitter with the one from OVMF, I may brick the firmware if it’s incompatible.

Any ideas?

JD



>> -----Original Message-----
>> From: edk2-devel <edk2-devel-bounces@lists.01.org> On Behalf Of Jd Lyons
>> Sent: Sunday, August 19, 2018 5:35 AM
>> To: edk2-devel@lists.01.org
>> Subject: [edk2] GOP Console Driver
>> 
>> 
>> 
>>> Begin forwarded message:
>>> 
>>> From: Jd Lyons <lyons_dj@yahoo.com>
>>> Subject: GOP Console Driver
>>> Date: August 18, 2018 at 11:31:50 PM EDT
>>> To: edk2-devel@lists.01.org
>>> 
>>> I’ve been trying to hack together GOP support for Apples EFI 1.1 on my
>> Mac Pro3,1. Apple uses a somewhat mix of EFI 1.x and UEFi2.x.
>>> 
>>> I’m able to get the GOP rom for my graphics card to load and link to the
>> device, Apple’s firmware takes care of that much, and I have some custom
>> code for rEFInd boot loader that makes the graphics card work in graphics
>> mode. However I can’t get back to a shell nor can I boot Windows or the Mac
>> OS in this mode.
>>> 
>>> I think the trouble with booting the macOS is Apple’s boot.efi can’t get the
>> console, Apple has a UGA Console driver but no GOP Console driver in my
>> firmware. I tried extracting the Graphics Console Driver from OVMF and it
>> does load, but doesn’t link to any devices, even when I try to connect it with
>> my device handle, I.E.
>>> 
>>> connect DA 129
>>> 
>>> Returns success, but invoking drivers shows the Graphics Console Driver is
>> still not linked to any devices.
>>> 
>>> Can anyone point me in the right direction on how to get a proper GOP
>> Console Driver?
>>> 
>>> Thanks,
>>> JD
>> 
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