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

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Message-ID: <46416217.1070202@zytor.com>
Date:	Tue, 08 May 2007 22:54:31 -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

yhlu wrote:
> On 5/8/07, H. Peter Anvin <hpa@...or.com> wrote:
>> H. Peter Anvin wrote:
>> 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.
>>
> so the kexec tools need to scan the pci devices list, and find out how
> to set real_mode.isVGA and orig_video_mode, also need to parse the
> comand line about vga console.

A better way, probably, would be for the kernel to export the
boot_params structure so kexec can reuse it.

	-hpa
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