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

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Message-ID: <20070508172449.GA1932@in.ibm.com>
Date:	Tue, 8 May 2007 22:54:49 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	yhlu <yhlu.kernel@...il.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Jeff Garzik <jeff@...zik.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [patches] [PATCH] [21/22] x86_64: Extend bzImage protocol for relocatable bzImage

On Tue, May 08, 2007 at 09:41:09AM -0700, yhlu wrote:
> On 5/2/07, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> >Vivek Goyal <vgoyal@...ibm.com> writes:
> >
> >> On Wed, May 02, 2007 at 02:59:11PM -0700, H. Peter Anvin wrote:
> >>> Jeremy Fitzhardinge wrote:
> >>> >
> >>> > So the bzImage structure is currently:
> >>> >
> >>> >    1. old-style boot sector
> >>> >    2. old-style boot info, followed by 0xaa55 at the end of the sector
> >>> >    3. the HdrS boot param block
> >>> >    4. setup.S boot code
> >>> >    5. the self-decompressing kernel
> >>> >
> 
> Eric,
> 
> With the latest change that make vmlinux to be elf64 and make bzImage
> do switch to 64bit long mode, the kernel started via kexec can not get
> VGA console. but the serial console works well. I wonder if the
> setup.S is skipped in bzImage via kexec path.
> 
> or i missed sth?
> 

Hi,

setup.S is never executed while doing kexec (unless somebody chooses to
do a real mode entry) and these patches don't change this beahviour.

Tomorrow I will test VGA behaviour on my machine. Are you using some
special frame buffer mode etc?

Thanks
Vivek
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