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.
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