--- In ts-7000%40yahoogroups.com, Eric Robishaw <> wrote:
>
> No, not really... the problem is the ambient temperature. There's not enough
> differential to diffuse heat away from something when the air you're blowing
> over it is as hot as the object itself.
>
> I really need a sleep mode of some kind. Some PC motherboard BIOSs have an
> automatic wakeup at a certain time of day, I was hoping to find something
> equivalent in the 7800 or something.
Please read the 'rtc.txt' file in ./Documentation of any recent 2.6 kernel. There is a good description of what's possible, along with a test program rtc.c. Sounds like many functions can be handled using the generic handler if the clock chip driver doesn't handle them. That doesn't address how you enter hibernation though, only how you wake up. If the orion boards are hooked up to the kernel PM suspend & resume, this could be a reasonable way to go. A side benefit is that your code would (could) be somewhat generic and work on x86 boards too.
A second approach would be to use the AVR microcontroller that TS has included in the TS-7800. In the utility ts7800ctl
(
ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7800-linux/samples/ts7800ctl.c)
there is a sleep command that will 'send stop signal' to the marvel chip. Max sleep is 8 * 65535 seconds in length, plenty long enough to wake up after the sun goes down! I guess this is the mode referred to on the ts-7800 preliminary manual page: "Sleep mode uses 200 microamps". AFAIK, it would be up to your pgm to monitor the temps, clean up your running processes, etc, to get ready for sleep, and then issue the command to the AVR.
I don't know how well, if at all, the AVR sleep is integrated with the linux PM functions. My guess is not at all, and you should plan on a reboot rather than a resume from suspend.
regards, .......... Charlie
>
> E
>
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> On Tue, Jun 2, 2009 at 11:07 PM, Morgan Gangwere <>wrote:
>
> >
> >
> > I'd assume fans/heatsinks are not an option at this point?
> >
> > --
> > Morgan gangwere
> >
> > "Space does not reflect society, it expresses it." -- Castells, M.,
> > Space of Flows, Space of Places: Materials for a Theory of Urbanism in
> > the Information Age, in The Cybercities Reader, S. Graham, Editor.
> > 2004, Routledge: London. p. 82-93.
> >
> >
>