Power management

QNX Newsgroups (Archives) qnx.rtos
1

Under 6.2.1, can I:
a) power down the processor into a low-power mode?
b) wake up the processor based on RS-232 activity?
c) spin down the EIDE disk?

Thanks in advance,
-RK

–
[If replying via email, you’ll need to click on the URL that’s emailed to you
afterwards to forward the email to me – spam filters and all that]
Robert Krten, PDP minicomputer collector http://www.parse.com/~pdp8/

2

Robert Krten <rk@parse.com> wrote:

Under 6.2.1, can I:
a) power down the processor into a low-power mode?
b) wake up the processor based on RS-232 activity?
c) spin down the EIDE disk?

Thanks in advance,
-RK

Ping? I got the “Application Driven Power Management” whitepaper,
but it didn’t go into details…

Cheers,
-RK

–
[If replying via email, you’ll need to click on the URL that’s emailed to you
afterwards to forward the email to me – spam filters and all that]
Robert Krten, PDP minicomputer collector http://www.parse.com/~pdp8/

3

Robert Krten wrote:

Robert Krten <> rk@parse.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
mode.

What system are you trying to implement this on?

c) spin down the EIDE disk?

I’m not sure if there’s an explicit interface to do this.

Thanks in advance,
-RK


Ping? I got the “Application Driven Power Management” whitepaper,
but it didn’t go into details…

Cheers,
-RK

4

Sunil Kittur <skittur@qnx.com> wrote:

Robert Krten wrote:
Robert Krten <> rk@parse.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
mode.

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 Sunil,
-RK

Thanks in advance,
-RK


Ping? I got the “Application Driven Power Management” whitepaper,
but it didn’t go into details…

Cheers,
-RK

–
[If replying via email, you’ll need to click on the URL that’s emailed to you
afterwards to forward the email to me – spam filters and all that]
Robert Krten, PDP minicomputer collector http://www.parse.com/~pdp8/