>Number:         179505
>Category:       usb
>Synopsis:       Kernel detaches Arduino Leonardo (and similar) board umodem 
>after the arduino boots
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-usb
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 12 02:30:00 UTC 2013
>Originator:     Mike Meyer
>Release:        9.1-releng
Meyer Consulting
FreeBSD bhuda.mired.org 9.1-RELEASE-p3 FreeBSD 9.1-RELEASE-p3 #0 r250692M: Thu 
May 16 11:14:23 EDT 2013     
r...@bhuda.mired.org:/usr/src/sys/amd64/compile/BHUDA  amd64
When the Arduino boards provide a umodem device to the host for programming and 
serial communications with the host from the user software (the software 
running after boot). The newest boards - starting with the Leonardo - also have 
the ability to provide a variety of HID devices at different endpoints. 

The older boards work fine. With the leonardo, the umodem device attaches as 
the board boots (or resets), and the /dev/ttyU* files are created for it. The 
device then detaches before or as the user code starts running, meaning the 
files vanish.

Plug a leonardo board into a USB port on your machine. Reset it if needed. As 
it reboots (the L led will be blinking), you can see the /dev/tty* files 
appear. They will be gone after the reboot is finished.

I don't have a fix. The board can be programmed by hitting reset shortly before 
running avrdude (so for now, this is a low priority problem).

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