Data Reliability

Kira Brown kira at
Mon Dec 13 05:46:11 EST 1999

On Tue, 7 Dec 1999, Bjorn Eriksson wrote:

> >I have already given two ways to avoid the problem: use the flash in
> >Read Only mode, or have a power supply which signals impending power
> >loss and holds itself up long enough to allow an ordered shut down.
> Definitely my choice. Anyone else working on this?

We've already done it.  Since we have not a lot running on the system, a
shutdown -h takes less than a third of a second on a 99MHz AMD Elan SC410
driving an 8Mbyte DoC2000.  We didn't write any special code other than a
little thingy (technical term) that watches one of the processor GPIO pins
for a falling edge and executes a shutdown if it sees one.  One of those
funky 1F memory retention caps provides the power to do this.  (Do those
things scare anyone else or is it just me?)


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