Public bug reported:
Binary package hint: udev
Some information about my system:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=7.10
DISTRIB_CODENAME=gutsy
DISTRIB_DESCRIPTION="Ubuntu 7.10"
The version of udev installed:
$ apt-cache policy udev
udev:
Installed: 113-0ubuntu17
Problem description:
I have an usb to rs-232 convertor with an FTDI chip (ftdi_sio kernel
module). With the standard permissions set by udev, this device is not
working correctly as a normal user.
For example, if I am trying to program a micaZ sensor node with uisp:
$ make micaz install,17 mib510,/dev/ttyUSB0
<snip>
installing micaz binary using mib510
uisp -dprog=mib510 -dserial=/dev/ttyUSB0 --wr_fuse_h=0xd9 -dpart=ATmega128
--wr_fuse_e=ff --erase --upload if=build/micaz/main.srec.out-17 --verify
Firmware Version: .
Failed to enter programming mode.
make: *** [program] Error 2
When I issue the same command as root, everything works as expected:
$ sudo /home/wouterh/local/tos2/bin/uisp -dprog=mib510 -dserial=/dev/ttyUSB0
--wr_fuse_h=0xd9 -dpart=ATmega128 --wr_fuse_e=ff --erase --upload
if=build/micaz/main.srec.out-17 --verify
Firmware Version: 2.1
Atmel AVR ATmega128 is found.
Uploading: flash
Verifying: flash
Fuse High Byte set to 0xd9
Fuse Extended Byte set to 0xff
Solution:
I have changed the following line in /etc/udev/rules.d/40-permissions.rules:
SUBSYSTEM=="usb_device", MODE="0664"
to
SUBSYSTEM=="usb_device", GROUP="plugdev", MODE="0664"
and restarted udev, and now everything is working as expected:
$ /home/wouterh/local/tos2/bin/uisp -dprog=mib510 -dserial=/dev/ttyUSB0
--wr_fuse_h=0xd9 -dpart=ATmega128 --wr_fuse_e=ff --erase --upload
if=build/micaz/main.srec.out-17 --verify
Firmware Version: 2.1
Atmel AVR ATmega128 is found.
Uploading: flash
Verifying: flash
Fuse High Byte set to 0xd9
Fuse Extended Byte set to 0xff
** Affects: udev (Ubuntu)
Importance: Undecided
Status: New
--
ftdi_sio device does not work correctly as a normal user
https://bugs.launchpad.net/bugs/198757
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