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From: Hans Petter Selasky <hselasky@c2i.net>
To: Guido van Rooij <guido@gvr.org>
Date: Fri, 5 Oct 2012 13:30:10 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: usb3 umass device on usb2 port not recognised
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On Friday 05 October 2012 13:26:42 Hans Petter Selasky wrote:
> On Friday 05 October 2012 10:57:27 Guido van Rooij wrote:
> > That piece of code did not help either:
> > usb_alloc_device: set address 2 failed (USB_ERR_STALLED, ignored)
> > usbd_setup_device_desc: getting device descriptor at addr 2 failed,
> > USB_ERR_STALLED usbd_req_re_enumerate: addr=2, set address failed!
> > (USB_ERR_STALLED, ignored) usbd_setup_device_desc: getting device
> > descriptor at addr 2 failed, USB_ERR_STALLED usbd_req_re_enumerate:
> > addr=2, set address failed! (USB_ERR_STALLED, ignored)
> > usbd_setup_device_desc: getting device descriptor at addr 2 failed,
> > USB_ERR_STALLED ugen5.2: <Unknown> at usbus5 (disconnected)
> > uhub_reattach_port: could not allocate new device
> > 
> > Do you know if there is a way to dump the USB-traffic between the disk
> > and a Linux system? Like I said earlier, the disk works on Ubuntu
> > 12.04, so it might give a clue on the difference between our way of
> > resetting the device and their way... (tcpdump only show traffic after he
> > rset and address assignment)
> 
> Yes, search for USBmon. Usually there are some device entries which you cat
> directly to a file.
> 
> Might be timing related!

There is also a tool at sourceforge, vusb-analyzer, which can view these 
files.

--HPS