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

[Randy Dunlap]

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@xxxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: H. Peter Anvin <hpa@xxxxxxxxx>
> ---
>  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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