Ivan Krstić wrote:
When we do a power-off (i.e. init 0), the next start is a cold boot,
correct?
For the sake of discussion, let's say yes (though it isn't actually the
same at all). Even then, the vast majority of the time, folks will
simply be doing suspend/resume.
On second thought, is this really better than making kids hold down the
spacebar for 4-5 seconds?
Yes. It still provides secure upgrades without requiring user
interaction.
Can we rely on waiting for folks to manually power-down their machines,
when the power button is actually just a suspend/resume button? To make
this scheme work, we really need a hardware condition which software
cannot replicate. That's why I mention removing the battery, or
*possibly* holding down the power button for four seconds (this would
have to be investigated).
By the way, I initially missed Carl-Daniel's note regarding this topic,
so consider my thoughts just an elaboration regarding what it would take
to re-enable writes after we've disabled them.
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