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This is based on chromiumos commit a5f4e82c59d6bcaf06b94623e5516d1db8cb843a.
http://git.chromium.org/gitweb/?p=chromiumos/third_party/flashrom.git;a=commit;h=a5f4e82c59d6bcaf06b94623e5516d1db8cb843a
See also http://www.flashrom.org/pipermail/flashrom/2011-November/008191.html



Besides disabling the SMM protection this also fixes something that bothered
me for a long time: the content of BIOS_CNTL was shown before we try to modify
it. This is usually not what interests us and contradicts other outputs.
With this patch we try to set the write enable and disable the SMM protection
first and show the state of BIOS_CNTL afterwards.

We now return an error only if the write enable is not set (which should be
equivalent to the previous behavior on sane hardware, but it seems to be
'more correct' and makes the code clearer to do this explicitly).

Corresponding to flashrom svn r1582.
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>