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Re: Grub2 and Efi (MacBook 5,1)

From: Felix Zielcke
Subject: Re: Grub2 and Efi (MacBook 5,1)
Date: Tue, 22 Sep 2009 20:07:38 +0200

Am Dienstag, den 22.09.2009, 19:54 +0200 schrieb Stefan Bienert:
> Felix Zielcke wrote:
> > Am Dienstag, den 22.09.2009, 19:34 +0200 schrieb Stefan Bienert:
> >> Michal Suchanek wrote:
> >>> Unfortunately. grub refuses to pass on vga=ask for me.
> > 
> > vga=ask only works with the old linux loader, linux16.
> > But that isn't avaible in EFI because in EFI you can't load the kernel
> > with its 16 bit entry point.
> > 
> > 
> >>> I am not sure what vbios is supposed to do for you. There is also the
> >>> question when the graphics card is switched to vga. Normally the
> >>> kernel expects the card to be in vga state so it should be probably
> >>> done by grub.
> >>, do we have any more dense tips, here? Sounds like the two of us
> >> are somehow lost ;-) I tried playing around with video=... without any
> >> success. Where can I find some docu on grub2 video and vga options?
> >>
> > you're searching in the wrong place. video and vga are options for the
> > Linux kernel.
> > Though vga= is parsed by grub, because the kernel excepts it's value in
> > a different format then in the standard commandline.
> > Note that `set gfxpayload=1024x768x16' (or whatever resolution/depth you
> > want) is now the prefered way with the new Linux loader.
> AHA! Well, confusion rises ...
> So, my grub-legacy configuration uses none of video or vga
> there a way to test if efifb is working with my kernel, anyway? I think
> a hint where to search should be enough.
> Just to get this right: If I use any framebuffer beside efifb, I need to
> load a video bios?

I don't have any EFI system myself and thus never used it, so I can't
help wit that.
> And last, but not least: What does "Linux loader" mean?

The linux or linux16 commands in GRUB 2.

Felix Zielcke
Proud Debian Maintainer

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