Re: [Gumstix-users] Gumstix Freezes, need advice...

[Lewis G. <gi...@nm...>]

is the behavior deterministic and easily repeatable?
maybe try starting pppd from a serial console and using strace or ltrace to
see at what point it hangs?
the serial console will also output any kernel "oopses" that might occur

you might also try running the whole system from 5V.  in my experience this
has been OK and it gives you more headroom

On Fri, Jun 12, 2009 at 3:11 PM, rketcham <Ric...@gm...> wrote:

>
> Hi!
>
> Thanks for the response. Oh... I wish it were that. I have 12 V at 1 A
> going
> into a DCDC converter which drops it down to 3.6 V and can supply up to 3
> A.
> Just in case, I bypassed the DCDC converter with a 4 V bench supply current
> limited to 3 Amps and it still reseted.
>
> I'm now looking at pppd as the culprit. I think ppp is usually operating
> when the device locks up and the watchdog resets it. Do you know of any ppp
> options which could possibly affect this?
>
> Rich
>
>
>
>
> Lewis Girod wrote:
> >
> > my first guess would be you are overdrawing your power supply cauing a
> > transient voltage dip that crashes the
> > gumstix.  cell modems cause particularly heavy current draw spikes, often
> > as
> > much as 2A.
> >
> > how are you powering the system?
> > try using a bench supply with a current meter to see what you are drawing
> > is.
> > these supplies also often have a current limiter which you can use to
> > emulate a smaller supply.
> >
> > On 6/9/09, rketcham <Ric...@gm...> wrote:
> >>
> >>
> >> Hello all,
> >> I have the gumstix connecting through a cell modem (via ppp) to a remote
> >> server. I also have a 7 port usb hub that is connected to the gumstix.
> >> When
> >> I have the gumstix using one or the other everything is fine and dandy.
> >> The
> >> trouble begins when I try to hook the hub to the gumstix and use the
> cell
> >> modem simultaneously. I'm not actually doing anything through the hub,
> >> it's
> >> just connected.
> >>
> >> In this case, after about 10 minutes the gumstix freezes and stops
> >> responding to the terminal. After about a minute the watchdog kicks in
> >> and
> >> restarts the gumstix and process starts over. When I disconnect D+ and
> D-
> >> from the hub (with everything still powered) it doesn't bind up at all.
> >>
> >> Does anyone have any ideas or tips on how to debug this?
> >>
> >> Thanks,
> >> Rich
> >> --
> >> View this message in context:
> >>
> http://www.nabble.com/Gumstix-Freezes%2C-need-advice...-tp23952168p23952168.html
> >>
> >> Sent from the Gumstix mailing list archive at Nabble.com.
> >>
> >>
> >>
> >>
> ------------------------------------------------------------------------------
> >> 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
> >>
> >>
> >
> >
> ------------------------------------------------------------------------------
> > 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
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Gumstix-Freezes%2C-need-advice...-tp23952168p24004636.html
> Sent from the Gumstix mailing list archive at Nabble.com.
>
>
>
> ------------------------------------------------------------------------------
> 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
>