linux-kernel - Re: [PATCH] x86: add a crc32 checksum to the kernel image.

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Message-Id: <20080205170939.10085936.randy.dunlap@oracle.com>
Date:	Tue, 5 Feb 2008 17:09:39 -0800
From:	Randy Dunlap <randy.dunlap@...CLE.COM>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] x86: add a crc32 checksum to the kernel image.

On Fri, 01 Feb 2008 09:02:48 +0000 Ian Campbell wrote:

> ---
> >From 1c614383dc9cb0c7791ebab386dc012db336b28c Mon Sep 17 00:00:00 2001
> From: Ian Campbell <ijc@...lion.org.uk>
> Date: Fri, 1 Feb 2008 09:01:22 +0000
> Subject: [PATCH] x86: add a crc32 checksum to the kernel image.
> 
> Signed-off-by: Ian Campbell <ijc@...lion.org.uk>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> ---
>  Documentation/i386/boot.txt |    7 +++
>  arch/x86/boot/tools/build.c |   88 ++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 94 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/i386/boot.txt b/Documentation/i386/boot.txt
> index b5f5ba1..f853d49 100644
> --- a/Documentation/i386/boot.txt
> +++ b/Documentation/i386/boot.txt
> @@ -531,6 +531,13 @@ Protocol:	2.08+
>  
>    The length of the compressed payload.
>  
> +**** THE IMAGE CHECKSUM
> +
> +The CRC-32 is calculated over the entire file using an initial
> +remainder of 0xffffffff.  The checksum is appended to the file

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> +therefore the CRC of the file up to the limit specified in the syssize
> +field of the header is always 0.
> +
>  **** THE KERNEL COMMAND LINE
>  
>  The kernel command line has become an important way for the boot

---
~Randy
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