[coreboot] SGABIOS checksum [kevin at koconnor.net: Re: SeaBIOS, serial output, and grub]

Kevin O'Connor kevin at koconnor.net
Fri May 15 01:15:15 CEST 2009

On Thu, May 14, 2009 at 03:38:33PM +0200, Peter Stuge wrote:
> Hi Nathan,
> there was some discussion on the coreboot mailing list, and it seems
> that the SGABIOS binary doesn't have a checksum calculated for it,
> which means that some BIOSes refuse to initialize it.
> The SeaBIOS project maintained by Kevin has a utility for calculating
> checksums, available at:
> http://git.linuxtogo.org/?p=kevin/seabios.git;a=blob;f=tools/checksum.py;h=8c7665d2508d598abf07510234515ffbf198cdff;hb=HEAD
> Kevin, I can't find that buildrom.py script in seabios.git?

Sorry - it's there now.

It's in "tools/buildrom.py" in the repo at:

git clone git://git.linuxtogo.org/home/kevin/seabios.git

It's also at:


The script pads a rom to 512 bytes, sets the rom length, and uses byte
7 as a checksum.  It wasn't designed for sgabios, but looks like it
will work.


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