Re: USB Storage Device Not Working

On Wed, Nov 07, 2007 at 05:19:00PM -0500, Alan Stern wrote:
> On Thu, 8 Nov 2007, balajirrao wrote:
> 
> > > Right now the kernel doesn't have any means for automatically forcing
> > > devices to run at full speed when they fail to enumerate at high speed,
> > > although adding such a feature might not be a bad idea.  However you
> > > can force a particular USB port to run at full speed by hand.  The
> > > command is:
> > > 
> > > 	echo P >/sys/class/usb_host/usb_hostN/companion
> > > 
> > > where P is the port number and N is the bus number of the EHCI 
> > > controller.
> > > 
> > Thank you very much for the command. It worked fine.
> > And, about that feature - I am interested in developing it. Can you
> > please help me as to how to go about it ? 
> 
> You will have to add a new method pointer to struct usb_hcd, maybe call
> it "relinquish".  In ehci-hub.c make the method routine check that its
> argument really is attached to a port on the root hub and hand that
> port over to the companion controller.  Then in hub.c if
> hub_port_connect_change() fails, make it invoke this new method.
> 
Thank you very much. I will work on this and get back to the mailing
list once i get doubts.
> Alan Stern
> 
regards,

Balaji Rao

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