cu: Permission denied

Joachim Ott jo.omsl at googlemail.com
Tue Dec 9 01:48:52 CET 2008


2008/12/9 luca pisani <luca.pisani at birdo.net>

>  Hello..
> I'm trying to change u-boot options for boot a larger kernel (
> http://people.openmoko.org/sean_mcneil/uImage-android)
> I'm doing (with neo in "flashing mode" Power+Aux):
>
> *bash-3.1$ su -
> Password:
> root at birdo:~# dmesg | tail
> usbcore: registered new interface driver cdc_acm
> drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for
> USB modems and ISDN adapters
> usb 3-1: new full speed USB device using uhci_hcd and address 4
> usb 3-1: configuration #1 chosen from 2 choices
> drivers/usb/class/cdc-acm.c: This device cannot do calls on its own. It is
> no modem.
> cdc_acm 3-1:1.0: ttyACM0: USB ACM device
> root at birdo:~# cu -l /dev/ttyACM0
> cu: creat (/var/lock/TMP0000000e56): Permission denied
> cu: /dev/ttyACM0: Line in use
> root at birdo:~# l /dev/ttyACM0
> crw-rw---- 1 root uucp 166, 0 2008-12-09 00:54 /dev/ttyACM0
> root at birdo:~# chown uucp.uucp /dev/ttyACM0
> root at birdo:~# l /dev/ttyACM0*
> * crw-rw---- 1 uucp uucp 166, 0 2008-12-09 00:54 /dev/ttyACM0
> root at birdo:~# cu -l /dev/ttyACM0
> cu: creat (/var/lock/TMP0000000e75): Permission denied
> cu: /dev/ttyACM0: Line in use
>
> *I was able to connect to u-boot in the past, I'm wondering what's
> happening now?
>

Who is using the the line? Try "fuser  */dev/ttyACM0". Maybe a getty started
from inittab, or udev thinks it must do something. And then, there are other
ways to modify the uboot environment while the FR is booted.

*
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