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Serprog already has such functionality, so it makes sense to share that.
TODO: Factor out serial communication into a separate file, have that
code be available even if serprog is not selected and make it portable
(it is very Linux-centric right now).

Corresponding to flashrom svn r768.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>