[USRP-users] X300 PCIe Driver Issues

Peter Witkowski pwitkowski at gmail.com
Tue Sep 9 12:41:06 EDT 2014


I recently contacted Ettus support regarding this issue, but I was
wondering if perhaps the e-mail list could help me out sooner or even
confirm the issues that I am having.

I currently have an X300 that is having some issues being connected over

First, I have an issue where the driver seems to hang in instances where an
overflow is encountered.  That is, if I run uhd_rx_cfile (or any other
application for that matter that is receiving data) and an overflow is
encountered, the application hangs and stops writing to disk.  No “O”
characters are printed.  However, once an overflow is properly caught and
handled (i.e., “O” characters are printed) I have no more issues with the
driver hanging for the rest of that power cycle.  From that point forward
all overflows are properly handled.    If I cycle power on the device or my
host machine, the problem comes back.  I tried to repeat this issue over
Ethernet, and overflow errors are always properly printed and handled.

Second, the PCIe driver requires an Ethernet connection.  That is, if I
unplug a network connection, I cannot run uhd_find_devices.  I can ping the
loopback address just fine and have verified that the loopback interface is
active, but I cannot run uhd_find_devices if my Ethernet connection is

I am running everything on a fresh install of Ubuntu 14.04 and have
verified that I have the latest FPGA image installed on the device.

Please let me know what I should try to alleviate the issues that I am
having.  Thank you in advance for your help.

Peter Witkowski
pwitkowski at gmail.com
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