On Wed, Nov 23, 2011 at 05:45:08PM -0500, Jay Ashworth wrote: > > Yeah. But at least that's stuff you have a hope of managing. "Firmware > underwent bit rot" is simply not visible -- unless there's, say, signature > tracing through the main controller.
I can't speak to traffic light controllers directly, but at least some
vital logical controllers do check signatures of their firmware and
programming and will fail into a safe configuration if the
signatures don't validate.
-- Brett
