Re: [PATCH] New x86_64 EFI patch

[Robert Millan <rmh@aybabtu.com>]

On Sat, Jul 12, 2008 at 11:26:25PM +0800, Bean wrote:
> On Sat, Jul 12, 2008 at 11:16 PM, Bean <bean123ch@gmail.com> wrote:
> >> Can you be more specific?  I thought grub was completely agnostic about Linux
> >> parameters.
> >
> > In the parameter passed to linux kernel, there are fields for video
> > adapter information, for example, frame buffer address, line length,
> > etc. Normally, we don't have to worry about it, but in the case of
> > efi, we must fill it in, as kernel can't detect the information
> > properly.
> 
> Hi,
> 
> BTW, it's the real mode part of Linux kernel that takes care of such
> job. It gathers video information by querying vbe. But in efi, we skip
> the real mode part and jump to protected mode directly, so we must
> also provide kernel with similar information that would be setup by
> the real mode part.

Ah, I suppose this explains why Linux crashes when we try to load it via
grub-linuxbios (I reused the i386-pc loader when doing the port, unaware
that this would be an issue).

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What good is a phone call… if you are unable to speak?
(as seen on /.)