Re: GOP Console Driver

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

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

> -----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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