Andy Green wrote: > Somebody in the thread at some point said: > | > | > | Mike Montour wrote: > |> Joerg Reisenweber wrote: > |> > |>> Powered via (this particular) 100/500mA USB-Host, none of both > |>> U_Boot would boot without battery. Though it's happily working on > |>> linux without GSM just on USB-power, after boot with battery. > |> > |> I have had some success (not all the time) running under Linux with > |> USB power and no battery, but I had to turn off the charger through > |> "echo 0 > /sys/.../chgmode" as well as turning off GSM. > |> > |> I have also found that WiFi stops working when the battery is removed, > |> but it recovers when I re-insert the battery. > |> > | > | It occurs to me... Is it possible that even with the battery in that we > | can get a brownout condition on resume? > > It's a good thought, but the brownout thing happens really early on > startup before the CPU actually comes up. We definitely get that far.
Should be able to check easily using a battery simulator, programmable power supply, and turning on all the devices. I have gps, gsm, accelerometers, the works on when I suspend and can't resume. Most of the time I can resume if I leave gsm off.
