linux-kernel - Re: Question about the vmlinuz file

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Date:	Wed, 2 Mar 2011 12:10:15 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alvaro Aguilera <alvaro.aguilera@...lbox.tu-dresden.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Question about the vmlinuz file

On Sat, Feb 26, 2011 at 01:25:24PM +0100, Alvaro Aguilera wrote:
> Hello,
> 
> perhaps someone here has a couple of minutes to explain me the
> difference between these two vmlinuz files from different
> distributions:

What distributions?

On my Fedora 12 laptop:

$ file /boot/vmlinuz-2.6.32.23-170.fc12.x86_64 
/boot/vmlinuz-2.6.32.23-170.fc12.x86_64: Linux kernel x86 boot executable bzImage, version 2.6.32.23-170.fc12.x86_64 (mock, RO-rootFS, root_dev 0x902, swap_dev 0x3, Normal VGA

On my debian box:

$ file /boot/vmlinuz-2.6.32-trunk-amd64 
/boot/vmlinuz-2.6.32-trunk-amd64: Linux kernel x86 boot executable bzImage, version 2.6.32-trunk-amd64 (unknown@Deb, RO-rootFS, swap_dev 0x2, Normal VGA

> 
> $file /boot/vmlinuz
> /boot/vmlinuz-2.6.37-40-desktop: Linux/x86 Kernel, Setup Version
> 0x20a, bzImage, Version 2.6.37, Version 2.6.37-40, RO-rootFS, root_dev
> 0x301, swap_dev 0x4, Normal VGA

This seems to match my two boxes.

> 
> $file /boot/vmlinuz
> vmlinuz: ELF 64-bit LSB shared object, AMD x86-64, version 1, stripped
> 
> the second file seems to be in ELF format and I cannot use it with my
> cluster management software.

What distro is it?

> 
> Is there a parameter I can use to compile the kernel image in one
> format or the other? or a tool to convert them?

When I build my own kernel on Debian I have:

$ file /boot/vmlinuz-2.6.37.1+ 
/boot/vmlinuz-2.6.37.1+: Linux kernel x86 boot executable bzImage, version 2.6.37.1+ (rostedt@...dalf) #23, RO-rootFS, root_dev 0x900, swap_dev 0x2, Normal VGA

Your second file looks more like a vmlinux than a vmlinuz file.

$ file vmlinux
vmlinux: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped

-- Steve
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