From: Blazej K. <bj...@co...> - 2009-05-20 18:38:26
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Hi, I am wondering if anybody knows what the chip labeled "U6" next to the OMAP processor on top of the gumstix overo is? Mine has markings "2635 88B6" on top of it. I'd like to know this as I'm working on reducing the overo standby consumption, and I have noticed that when the OMAP processor chip is sleeping the OMAP chips is cold to the touch, but the U6 chip is lukewarm, so I'm wondering what it is doing and whether we can turn it off. On the same lines, I have noticed the TI power management chip tps65950 on the overo is warm during OMAP sleep, so I'll work on the driver for that chip to put it to sleep properly. Thanks, Blazej |
From: Steve S. <sa...@gm...> - 2009-05-20 22:19:44
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On Wed, May 20, 2009 at 11:38 AM, Blazej Kot <bj...@co...> wrote: > Hi, > I am wondering if anybody knows what the chip labeled "U6" next to the OMAP > processor on top of the gumstix overo is? Mine has markings "2635 88B6" on > top of it. This is the USB PHY chip for EHCI. If you want to experiment a bit, look in board-overo.c and you'll see: #define OVERO_GPIO_USBH_NRESET 183 This is the reset pin for the PHY chip and is normally high. If you pull this GPIO low you will put the PHY in a low power state (and reset it too of course). Steve > I'd like to know this as I'm working on reducing the overo standby > consumption, and I have noticed that when the OMAP processor chip is > sleeping the OMAP chips is cold to the touch, but the U6 chip is lukewarm, > so I'm wondering what it is doing and whether we can turn it off. > On the same lines, I have noticed the TI power management chip tps65950 on > the overo is warm during OMAP sleep, so I'll work on the driver for that > chip to put it to sleep properly. > Thanks, > Blazej > ------------------------------------------------------------------------------ > Crystal Reports - New Free Runtime and 30 Day Trial > Check out the new simplified licensing option that enables > unlimited royalty-free distribution of the report engine > for externally facing server and web deployment. > http://p.sf.net/sfu/businessobjects > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > |