Re: [avrdude-dev] Avrdude Permissions On Linux

[Ned Konz]

Chris Spencer wrote:
> I have an AVR ISP mkII programmer, and I can only access it with avrdude 
> when I'm root. As a normal user I get the error 'avrdude: usb_open(): 
> cannot read serial number "error sending control message: Operation not 
> permitted"'
> What permissions in Linux do you have to change to access the programmer 
> as a normal user?

First do a lsusb as root. Then you should be able to change the 
permissions on the corresponding /proc/bus/usb/<bus#>/<dev#> file to 777 
or whatever.

But this will only last until you unplug the mkII, if you have 
devfs/hotplug/usbdevfs, because these make device nodes dynamically.

If you want a more lasting solution...

Assuming you have hotplug and usbdevfs (which is the currently blessed 
scheme for doing such things), you should be able to set up an automatic 
chmod/chgrp script in /etc/hotplug/usb . Look at 
/etc/hotplug/usb/usbserial and /etc/hotplug/usb/usbserial.usermap, for 
instance.

You'll need the vendor id/product id pair (run lsusb as root to get this).

Or you could just add it to /etc/hotplug/usb/usbserial.usermap and edit 
/etc/hotplug/usb/usbserial to set the permissions/group ownership as needed.

Read up on hotplug for more info.

--
Ned Konz
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http://bike-nomad.com