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Re: Multiboot video mode request on EFI-gop


From: Phillip Susi
Subject: Re: Multiboot video mode request on EFI-gop
Date: Mon, 16 Jan 2012 10:35:32 -0500
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:9.0) Gecko/20111222 Thunderbird/9.0.1

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On 1/16/2012 10:22 AM, 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.

Ahh, yes, this is because gop doesn't set a vesa mode and let you play
with the flat frame buffer.  You actually  make gop calls to perform
the IO for you.  Grub can leave the display in that state when passing
off to the kernel, but the kernel has to have its own KMS video driver
to take over; it can't just start poking at a frame buffer like it can
with VESA.

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