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The chip code is untested, only one erase function out of two is currently
implemented, and unlocking/printlocking is not yet supported.

Thanks Mattias Mattsson <vitplister@gmail.com> for the initial patch!

Corresponding to flashrom svn r1434.
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>