Sunil Kittur <firstname.lastname@example.org> wrote:
Robert Krten wrote:
Robert Krten <> email@example.com> > wrote:
Under 6.2.1, can I:
a) power down the processor into a low-power mode?
You can do this by implementing the power callout in
startup. This callout is invoked by sysmgr_cpumode().
This was added in the 621 supplemental release.
b) wake up the processor based on RS-232 activity?
This depends on the system - if the uart interrupt or
other mechanism can bring the cpu out of its low power
What system are you trying to implement this on?
It’s an AMPRO littleboard 700 …
c) spin down the EIDE disk?
I’m not sure if there’s an explicit interface to do this.
The thing I’m worried about here is that this is a medical
device that’s on 24x7 and we want to minimize wear and tear
on the hard disk. If there is no explicit interface to do
this, my question then becomes: if I shut down the drive
(somehow myself) will the filesystem wake it up for me when
it needs to?
Thanks in advance,
Ping? I got the “Application Driven Power Management” whitepaper,
but it didn’t go into details…
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Robert Krten, PDP minicomputer collector http://www.parse.com/~pdp8/