Re: [Gumstix-users] Problem with usb port with YOCTO

[Frank A. <ft...@ya...>]

On 11/28/2012 1:30 PM, CaseyS wrote:
> Hello,
>
> I am currently using the Yocto build environment and have been able to
> successfully build the XFCE image based on Linux kernel 3.5. As an aside I
> also performed the additional steps found  here
> <http://www.sleepyrobot.com/?p=210>   in order to get dsp working. The
> trouble I am running into is my usb ports do not seem to work with this
> image. I have a powered usb hub attached to the otg port, but the kernel
> doesn't seem to enumerate it. If i remove my sd card and boot from nand the
> hub works properly. This leads me to believe something is off with my kernel
> configuration, but I am unsure what to change. Usb seems to be enabled in my
> defconfig file so I don't know why this problem is occurring, any help would
> be greatly appreciated.

If you have one available, try loading a usb gadget module.  One example 
would g_ether, ie "modprobe g_ether".  The otg subsystem now needs to 
have a gadget driver loaded before it scans for host devices.  I know 
that does not make sense, requiring a gadget driver for host mode to 
work.  But that's how the usb otg works since about the 3.1 timeframe.

frank