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If a programmer has untested or non-working write/erase code, but
probing/reading works, it makes sense to protect the user against
write/erase accidents. This feature will be used by the Nvidia MCP SPI
code, and it also might make sense for the gfxnvidia driver which has
non-working write/erase.

Corresponding to flashrom svn r1069.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>