USB device repeatedly disconnected

[Denny Lin]

Hi Hans,

On Sun, Sep 21, 2014 at 07:04:42PM +0200, Hans Petter Selasky wrote:
> You can try setting:
> 
> hw.usb.no_cs_fail=1

This appears to have no effect--the device still repeatedly disconnects.

> Also run usbdump to capture the USB traffic.
> 
> usbdump -i usbus1 -f 7 -vvv -s 65536

A sample dump is available at:
http://n.ethz.ch/student/dlin/aos/usbdump.txt

Although I didn't understand the dump, I tried tracing the code.
The device is disconnected when usb_free_device() is called within
uhub_reattach_port() (the repeat part) in sys/dev/usb/usb_hub.c. I'm not
sure what triggers this though.

-- 
Denny Lin