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The datasheet says there's a set of registers in the 4Mbit before the
flash memory.  The block locking registers are aligned on 64K
boundaries, plus 2.

Write/erase sucessful on a system it failed before:
  http://www.flashrom.org/pipermail/flashrom/2010-August/004432.html



Corresponding to flashrom svn r1144.
Signed-off-by: Joshua Roys <roysjosh@gmail.com>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>