cu: Permission denied

[luca pisani]

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?

Bye Luca
PS: Before, I tryed Qi with no luck.....


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