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Supports RS-232, USB serial converters (untested) and TCP streams.

The protocol specification is in serprog-protocol.txt

There will be tweaks to the code and maybe the protocol in the future,
so the API is not set in stone yet.

Corresponding to flashrom svn r656.
Signed-off-by: Urja Rannikko <urjaman@gmail.com>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>