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The bug was invisible so far because we always started at offset 0. The
pending partial write patch uses nonzero start offsets and trips over
this bug.

Clarify a few comments in IT87 SPI.

Thanks to Idwer Vollering for reporting write breakage with my latest
partial write patch. This should fix the underlying problem.

Corresponding to flashrom svn r1217.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Idwer Vollering <vidwer@gmail.com>