From: Willy Tarreau <w@1wt.eu>
To: Ian Campbell <ijc@hellion.org.uk>
Cc: Martin Schlemmer <Martin.Schlemmer@nwu.ac.za>,
linux-kernel@vger.kernel.org
Subject: Re: Initramfs from existing vmlinuz
Date: Mon, 5 Jan 2009 12:47:30 +0100 [thread overview]
Message-ID: <20090105114730.GD3268@1wt.eu> (raw)
In-Reply-To: <1231153946.2648.49.camel@zakaz.uk.xensource.com>
On Mon, Jan 05, 2009 at 11:12:26AM +0000, Ian Campbell wrote:
> On Wed, 2008-12-24 at 00:34 +0100, Willy Tarreau wrote:
> > You first have to extract and uncompress the ELF image from vmlinuz.
> > For this, look for the gzip signature 1F 8B 08 in your vmlinuz, and
> > feed all data starting from this point to zcat.
>
> Since v2.6.26 (I think, it was v2.08 of the x86 bzImage format anyhow,
> which was the same point the payload became ELF formatted) you can find
> it directly using the payload_offset and payload_length fields in the
> bzImage header. Attached bzexplode.c demonstrates this. e.g. "bzexplode
> vmlinuz | zcat > vmlinux.elf"
Thanks Ian.
Indeed, I'm sure this will be useful from time to time!
Cheers,
Willy
prev parent reply other threads:[~2009-01-05 11:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-23 22:28 Initramfs from existing vmlinuz Martin Schlemmer
2008-12-23 23:34 ` Willy Tarreau
2008-12-24 11:37 ` Martin Schlemmer
2008-12-25 17:55 ` Martin Schlemmer
2008-12-25 18:17 ` Initramfs from existing vmlinuz (#2) Martin Schlemmer
2009-01-05 11:12 ` Initramfs from existing vmlinuz Ian Campbell
2009-01-05 11:47 ` Willy Tarreau [this message]
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