I could in my archive messages:
I can confirm that the pulsing detected by PMIC on USB_DC signal is the
probing from USB-OTG.
After I disabled the USB-OTG in the kernel, the system has never rebooted.
Btw I also re-loaded Angstrom image (3.8 kernel) and Andrew's Android image
(with 3.8 kernel). I did not observe USB-OTG probing pulses on the VBus. I
believe in the 3.8 kernel, the USB-OTG has not been implemented/enabled.
That might be reason why it seems that 3.8 kernel doesn't have the random
reboot behavior.
In case anyone wants to test it out, here is the change in the source code
(NOTE: ignore the line and column numbers; just search for the struct
"static struct omap_musb_board_data musb_board_data" ):
...
--- a/arch/arm/mach-omap2/board-am335xevm.c
+++ b/arch/arm/mach-omap2/board-am335xevm.c
...
@@ -3956,7 +4125,8 @@ static struct omap_musb_board_data musb_board_data = {
* mode[4:7] = USB1PORT's mode
* AM335X beta EVM has USB0 in OTG mode and USB1 in host mode.
*/
- .mode = (MUSB_HOST << 4) | MUSB_OTG,
+// .mode = (MUSB_HOST << 4) | MUSB_OTG,
+ .mode = (MUSB_HOST << 4) | MUSB_PERIPHERAL,
.power = 500,
.instances = 1,
};
2015-07-21 8:50 GMT+03:00 'dl4mea' via BeagleBoard <
[email protected]>:
> Since we now have two threads about the same problem...
> https://groups.google.com/forum/#!topic/beagleboard/lF1X1XINjDo
>
> My 13 BB-Black under test are powered from external +5V with these power
> supplies:
>
> http://www.deutronic.com/products/power-supplies/ac-adapter/esc15g-15-watt.html
> Average reboot number of each BB-B was each about 3 per day.
>
> After reading this thread, I simply connected a USB cable from the front
> side Type-A to the back side Mini-USB and since then the number of reboots
> drastically decreased, within the last 12h I saw in total just two.
> Other systems under my control but not located in my lab are showing the
> same improvement.
>
> --- Günter (dl4mea)
>
>
>
> --
> For more options, visit http://beagleboard.org/discuss
> ---
> You received this message because you are subscribed to the Google Groups
> "BeagleBoard" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> For more options, visit https://groups.google.com/d/optout.
>
--
LinkedIn - http://www.linkedin.com/in/maximpodbereznyy
Company - http://www.linkedin.com/company/mentorel
Facebook - https://www.facebook.com/mentorel.company
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
