Re: GOP Console Driver

[Jd Lyons <lyons_dj@yahoo.com>]

> On Aug 19, 2018, at 1:05 PM, Jd Lyons <lyons_dj@yahoo.com> wrote:
> 
> 
> 
>> 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
> 
> 

Seems there is a driver for Clover boot loader that fixes this issue for me, does some stuff with gST>ConOutHandle.

https://github.com/svn2github/cloverefiboot/blob/master/OsxAptioFixDrv/OsxAptioFix2Drv.c

That let me boot OS X via the GOP card in my system, thanks for the help Marvin.


> 
>>> -----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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>