Hi Jesse,
> You may be overextending your power supply, what are you using for 5V
> power?
I have tried several power supplies:
- 5 v. stable 1A
- 5 v. stable 2A
- 5 v. stable 3.8A
> USB devices are only allowed to use so much power before they
> are turned "on" by software during bus enumeration. When the USB
> stack starts enabling devices, it is conceivable that your power
> supply may dip and cause the board to get stuck in reset from the
> voltage brownout detector.
I have monitored the board with a tester, and I have not found anything
abnormal:
- 4.97 volt stable
- max 0.8 A
The board, during the tests, had 2 bluetooth dongles plugged-in.
> Anything else you can tell us about the
> state of the board in "lock-up" -- LEDS, current draw, voltage across
> +/- power terminals, etc?
>
When the kernel blocks, green led is on, while red led is off.
>> I have discovered that there is an "old" (2004) NetBSD
>> ep93xx-patch that seems fix this bug... but I haven't found nothing
>> similar for Linux.
>>
>
> I'm not sure what patch you might be referring to, could you elaborate?
>
I mean you patch to NetBSD
(http://mail-index.netbsd.org/port-arm/2004/12/04/0000.html). Probably,
I'm wrong, but your comment is "fixes USB initialization hang".
I think that this is not a power supply problem. I have also tried an
usb hub with external power supply, but the problem persists. Have you
any other idea/suggestion?
Thanks,
Marco Pracucci
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|