How USB's are enumerated on the XO

[John Watlington]

My experience is that you have to find a USB device parameter
(serial number, MAC address, etc.) that is different between the
two USB devices for this to ever work reliably.

wad

On Jun 23, 2008, at 10:37 AM, shivaprasad javali wrote:

> I was trying to use the port no to which the usb device is  
> connected to differentiate between two usb devices of the same type  
> connected in my application. For that I wanted the variant field  
> between the two usb devices so that I can uniquely identify them.
>
> P.S: The output of lshal -m wasnt of much help for me.
>
> Thanks
> Shivaprasad
>
>
> On Mon, Jun 23, 2008 at 7:47 PM, Tomeu Vizoso  
> <tomeu at tomeuvizoso.net> wrote:
> 2008/6/23 shivaprasad javali <jbsp72 at gmail.com>:
> > Hi,
> >
> >       I have a usb device to be used with my application which  
> does not have
> > any unique serial no. I noticed that when I connect two such  
> devices to the
> > XO , In the /proc/bus/usb/devices file the Bus for the two  
> remains the same
> > but the port no is different for the two. When I connect the same  
> two
> > devices to a normal machine running fedora core 7, Its the Bus  
> that changes
> > for the two and the port no remains the same.
> >
> >       The XO that I have is relatively old. So I wanted to know  
> whether this
> > is what is expected on the XO or Is it different on the later  
> versions of
> > the XO.
>
> I didn't quite understood what you are trying to do, but something
> that may help you is to plug and unplug the usb sticks while lshal -m
> is running. That may tell you something interesting.
>
> Good luck,
>
> Tomeu
>
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