Re: [Discuss-gnuradio] Problem establishing connection with USRP

[Johnathan Corgan]

On Sat, May 9, 2009 at 11:27 PM, William L. Bahn <address@hidden> wrote:

> usrp_open_interface:usb_claim_interface: failed interface 0
> could not claim interface 0: Operation not permitted
> open_nth_cmd_interface: open_cmd_interface fo;ed
> usrp: failed to load firmware /usr/share/usrp/rev4/std.ihx
>
> It then proceeds with a long Traceback, which I can provide if someone would
> like.
>
> The "Operation not permitted" makes me wonder if it's a permissions issue.

The binary installation on Ubuntu creates a user group 'usrp', and
sets the permissions for USRP access via USB to allow any user who is
a member of that group.   The final part of the install instructions
tell you to add your user account name to group 'usrp' and then log
out and back in as that user for it to take effect.  This is why
running as root via sudo got past this part.

> Can't find fpga bitstream: std_2rxhb_2tx.rbf

This should have been installed into:

/usr/share/usrp/rev4/std_2rxhb_2tx.rbf

First verify if it is there; if it is not, then the 'usrp-firmware'
package didn't get installed for some reason.  You can do 'apt-get
install usrp-firmware'.

> FYI: This is on a Dell netbook (Inspiron 910) and apparently  you can't
> actually log in as root.

Ubuntu, by default, disables the root account login, and allows the
user configured during installation to use sudo instead.

Johnathan