linux-kernel - Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

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Message-ID: <4641573C.1000205@zytor.com>
Date:	Tue, 08 May 2007 22:08:12 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	yhlu <yhlu.kernel@...il.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>, vgoyal@...ibm.com,
	Gerd Hoffmann <kraxel@...hat.com>,
	Jeff Garzik <jeff@...zik.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org,
	virtualization <virtualization@...ts.linux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>, Andi Kleen <ak@...e.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for
 relocatable bzImage

H. Peter Anvin wrote:
> yhlu wrote:
>> On 5/8/07, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>>> Since the whole point is to detect the case where we don't have
>>> a screen at all it makes sense to check several additional variables
>>> and make certain that they are all 0.  Agreed?
>> need one good way to find if there is support vga console.
> 
> There really isn't one, at least not given the current data structure;
> the data structure has an "isVGA" flag, but if that is 0 it's supposed
> to mean CGA/MDA/HGC/EGA, as opposed to VGA...

Of course, one could argue that since all of those were obsolete by the
time Linux was first created, that it probably doesn't matter and that
isVGA == 0 pretty much means the more obvious thing.

MDA/HGC stuck around for quite a while for debugging, since it was
non-conflicting with VGA, but even if it is, the reason people put it in
their system is to have something that the OS doesn't readily see.

	-hpa
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