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All mentioned north bridges have been checked against data sheet. That's
all north bridges google found a datasheet for with "byte merge" included.

Runs multiple chipset enables if the first one requests further enables to
be run.

VIA byte-merging logic tested: works.
multiple chipset logic: completely untested

Corresponding to flashrom svn r1043.
Signed-off-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>