cu: Permission denied

Valerio Valerio vdv100 at
Tue Dec 9 01:47:47 CET 2008

On Tue, Dec 9, 2008 at 12:10 AM, Timo Juhani Lindfors
<timo.lindfors at>wrote:

> luca pisani <luca.pisani at> writes:
> > root at birdo:~# cu -l /dev/ttyACM0
> > cu: creat (/var/lock/TMP0000000e56): Permission denied
> > cu: /dev/ttyACM0: Line in use
> What if you try "picocom /dev/ttyACM0" instead of cu?

Cu works for me without any problem. I do this:

- Power on the FR holding the aux and the power boot at the same time.
- In the U-boot menu select "set console to usb".
- In my host PC typed : cu -l /dev/ttyACM0

I changed my u-boot options and everything works like a charm.

Best regards,

Valério Valério

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