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Re: [Xen-devel] beginnings of allowing more than the basic 80x25 VGA scr

To: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] beginnings of allowing more than the basic 80x25 VGA screen resolution
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Mon, 4 Jul 2005 08:50:27 +0100
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On 4 Jul 2005, at 08:28, Jan Beulich wrote:

Hmm, interesting. I would have hoped such thing would exist, but I
can't see how it could work, since the code affected by
CONFIG_VIDEO_SELECT (which is what in non-guest Linux deals with the
vga= option) doesn't even exist in XenLinux. Further more, since XEN is
a multiboot image, it would require infrastructure to switch back to
real mode for issuing the necessary INT10-s in the guest kernel, which I
think is neither very desirable nor existing.

So I must be missing something, but I'd need a pointer at where I would
have to look for the alternative code.

We could certainly add a way to propagate the mode option through to the vga driver, but is the Linux vga driver really unable to switch modes without bios help? Is there support for a protected-mode vesa/vbe driver instead?

 -- Keir

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