linux-kernel - Re: PATCH/RFC: bzImage payload as compressed ELF file.

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Message-Id: <1201643758.9516.25.camel@cthulhu.hellion.org.uk>
Date:	Tue, 29 Jan 2008 21:55:58 +0000
From:	Ian Campbell <ijc@...lion.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: PATCH/RFC: bzImage payload as compressed ELF file.


On Tue, 2008-01-29 at 13:50 -0800, H. Peter Anvin wrote:
> Ian Campbell wrote:
> > 
> > I finessed the length issue slightly since it happens that the word
> > before the payload is the payload's length. I'm mulling a variety of
> > options:
> >       * declare it compression scheme dependant. At least for gzip
> it
> >         knows when it has reached the end.
> >       * codify the length followed by data thing we happen to have
> now
> >       * add a length field to the header, using another 4 bytes (is
> >         there any pressure on the size of the header?).
> > 
> > I'd probably go with the later unless we are pressed for space in
> the
> > header.
> 
> I would agree with that.  In fact, while we're adding fields to the 
> header, I would like to add a field that would be the CRC32 (or other 
> simple integrity check) over the whole image.

As in over the whole compressed payload part? I'll add that while I'm
there.

Ian.
-- 
Ian Campbell

"Jesus may love you, but I think you're garbage wrapped in skin."
		-- Michael O'Donohugh

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