Hi Tom,
On Sun, 25 Nov 2007, tcumming123 wrote:
> I'm trying to go asleep as much as I can for a few hours and I want to
> go as low-power as I can get. The only thing off-board is a USB
> camera, and maybe a gps. Is there a way to power down the USB?
>
> It'd save me some power if I could shut down the Ethernet and anything
> else that's running. All I really want to run is the clock so I can
> tell when to wake up. Slowing down the processor would also save some
> power, can that be done too?
You don't say what board you are using. I only have an early TS7200.
Way back I wrote a program to do as much turning off of stuff as I could
on the TS7200. It's called cctl and the source code tar ball is on my web
site at..
http://www.comp.leeds.ac.uk/jj/linux/cctl.tgz
It allows the clocks of the EP9301/2 to be altered at will, the latest
version also alters the SDRAM refresh rate in step so that refresh is not
affected.
It allows the ethernet PHY to be a turned off - a big power win with the
TS7200.
Feedback indicates the program works with TS7260 boards, hence I assume
TS7250 also.
On the TS7260 there are extra controls to be able to turn off power to the
LCD connector, power to the USB and RS232 level converters
I believe this is the relevent info:
address 0x1200_0000.
Bit 0 switches the RS232 converter power (1 = on, 0 = off)
Bit 1 switches the USB power
Bit 2 switches the lcd header power
I've been meaning to add control of these - but I've not got the hardware
to test it.
I also understand that Technologics have added some facilities to their
version of busybox so that freq can be changed etc. There have been
discussions in this list on this before, so it would be worth you
searching the archives at Yahoo.
Jim
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