Hello,
I am also very interested in the 1/4 watt mode of operation, have
you received any help with this ? Have you had any luck manipulating
the power management register on the TS7260 ?
Len.
--- In "genosensor" <> wrote:
>
>
> I'm evaluating one of the new TS-7260 boards for
> a battery operated data logging / robotic application.
>
> For some entertaining background, see:
>
> http://www.zenspider.com/dl/rubyconf2005/EmbeddedRuby.pdf
>
> I can confirm that the board draws slightly less than 1 watt
> running full speed without ethernet attached -- with the phy
> enabled. It draws about 1.4 W with ethernet attached.
>
> The manual and datasheet boast that one can slow the 7260's system
> clocks,etc. to attain a 1/4W power dissipation. I've downloaded
> Jim Jackson's cctl tool to fiddle with the CPU's clock rates
> and have looked briefly at the ts8 kernel's cpufreq patch.
>
> Does anyone (at Technologic? ;-) know the exact register
> configurations that were used to get 7260's power down this low?
> What were the processor and bus clock rates?
>
> My app does not need ethernet to work while operating in
> it's low-power mode, but the PC/104 bus and serial ports must
> function. We have our own low-power PC/104 motherboard
> with an octal USART.
>
> Does the latest 7260 kernel (ts9?) include some form of the cpufreq
> patch? If not, would you expect it to apply (and work) with the
> latest Technologic kernel?
>
> My current plan is to enhance the cctl tool to include support for
> fiddling with the Power Management Register unique to the 7260.
> Has anyone already done this?
>
> - brent
>
> P.S. For extra credit:
> Bit 4 in the Power Management Register turns off the PC/104
> clock. Are the other PC/104 lines still functional when the clock
> is disabled? e.g. If our PC/104 board does not use the clock, would
> it likely function with the bit cleared.
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|