Re: [Gumstix-users] Inconsistent USB Device Enumeration

[William P. S. I. <bil...@xp...>]

I'm not sure if this is your problem, but I had something similar when using
a 7 port Belkin Hub and an Alpha WiFi adapter.

I got similar errors, even though the hub was powered .

 

I tried a 4 port version and it worked like a charm. I have no idea why .

 

Bill

 

"People sleep peaceably in their beds at night only because rough men

stand ready to do violence on their behalf." - George Orwell

 

From: Michael Lindemuth [mailto:mli...@us...] 
Sent: Tuesday, October 11, 2011 4:53 PM
To: gum...@li...
Subject: [Gumstix-users] Inconsistent USB Device Enumeration

 

Hello All,

 

I've been trying to debug and Google this issue on my own for the past
couple of weeks.  Maybe someone here has experience this before.  I have two
USB devices that I connect via a hub plugged into to the standard USB port
(not OTG) on the Tobi with a Overo Fire FE attached.  Each draws on average
250mA, but when I enumerate usb-devices it says that they may draw a maximum
of 400mA.  These devices sometimes connect on startup.  If I power cycle the
USB port by echoing 0 then 1 to GPIO 168 I can sometimes get them to come
up.  Once they're up they work for as long as the Overo is on.  The USB hub
I have can be powered externally, but that does not seem to make a
difference.  Does anyone have any suggestions?

 

I keep seeing the errors in dmesg and on my shell that read like this:

usb 1-2.4: device descriptor read/64, error -110

usb 1-2.4: device descriptor read/8, error -110

...

hub 1-2:1.0: unable to enumerate USB device on port 4

 

I have experienced this issue with several other kernels and rootfs's, but
just in case here's my setup:

 

Overo Fire FE COM R2899

Tobi R2980

2.6.39 <http://wiki.gumstix.org/index.php?title=Category:How_to_-_Low_Power>
Sakoman's Power Management Kernel (wish it had cpufreqd hooks...) with USB
EHCI and OHCI OMAP3 modules enabled

Ubuntu 11.04

 

Suggestions?

 

Thank You All For Your Time,
Michael