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ICH SPI can enforce address restrictions for all accesses which take an
address (well, it could if the chipset implementation was not broken).
Since exploiting the broken implementation is harder than conforming
to the address restrictions wherever possible, conform to the address
restrictions instead. This patch eliminates a lot of transaction errors
people were seeing on chip probe.

Corresponding to flashrom svn r1016.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>