burn_mtd script fixes

[ron minnich]

On 15 Aug 2003, Roger wrote:
> Have yet to be able to get a successful linuxbios install on my 440bx
> chipsets. So this would be "putting the horse before the carriage" for
> me. :-/

I'm off to vacation but will be happy to try to help when I get back in 10 
days.

If anybody wants to take a shot at something new and fun, a port of a 
known-working-board to 2.0 would be very useful.

ron