Re: Multiboot video mode request on EFI-gop - Vladimir 'φ-coder/phcoder' Serbinenko

From: "Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>
To: The development of GNU GRUB <grub-devel@gnu.org>
Cc: Thomas Nilsen <cumulusnimbus@gmail.com>, Phillip Susi <psusi@ubuntu.com>
Subject: Re: Multiboot video mode request on EFI-gop
Date: Mon, 16 Jan 2012 16:46:42 +0100	[thread overview]
Message-ID: <4F144662.6050400@gmail.com> (raw)
In-Reply-To: <CAHtC_A23KN_uOr5TeTkOdYLw-=Db8eXU5QH-tJ9H50_hhAKbFw@mail.gmail.com>

On 16.01.2012 16:22, Thomas Nilsen wrote:
> Hi,
>
> I think i might have explained myself incorrect.
>
> What i mean is:
>
> 1. Grub2 runs very well on BIOS & (U)EFI bios. Nice graphics as 
> requested in gfxmode etc.
>
> 2. Grub2 loads multiboot kernel and gives it its requested videomode 
> (from the videomode request part of multibootheader)
>
> 3. Grub2 does NOT load multiboot kernel and gives it its requested 
> videomode. It seems to give it its mode, but the info is not right in 
> the multiboot parameters.. So the "kernel" cannot tell what mode it 
> is, where its LFB is and bpp etc.
>
> Conclusion:
>
> So what i think is happening (not happening) is that when using GOP 
> and not VBE (for bios) then the updating of the multibootparams are 
> not handled correctly.. It might be my mistake, but i cannot seem to 
> get it working.. (might be my code that is not right..)
>
Did you notice that the structure for the generic video is different and 
pointed in another place than VBE one?
> regards
> Thomas
>
> 2012/1/16 Phillip Susi <psusi@ubuntu.com <mailto:psusi@ubuntu.com>>
>
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>     On 1/16/2012 5:24 AM, Thomas Nilsen wrote:
>     > Im thinking since its the efi-gop driver/module that handles video
>     > mode on EFI boot this could probably be used when booting the same
>     > way that vbe module does the change before executing the kernel.
>
>     That's exactly what it is for.  Make sure you have that module loaded.
>
>     > Im interrested in contributing on fixing this if someone with some
>     > information can point me where to start off if someone knows whats
>     > missing, or maby what is going wrong. I will start doing some
>     > research aswell, but help is very much appreciated.
>
>     If the GOP module is loaded and you are not satisfied with the video
>     modes it provides, then AFAIK, you will need to either try a different
>     motherboard ( that has a different EFI GOP implementation ) or get the
>     specs for your video card and write your own EFI GOP driver.
>
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-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko