[USRP-users] Help: USRP N200 not detected

Ralph A. Schmid, dk5ras ralph at schmid.xxx
Wed Sep 4 03:28:28 EDT 2013

The older USRP1 has (almost) nothing inside that can be flashed - it gets
the images freshly applied after starting the software that uses the USRP1,
and they are gone when the USRP1 is powered off :-)





From: USRP-users [mailto:usrp-users-bounces at lists.ettus.com] On Behalf Of
Mythili Vutukuru
Sent: Wednesday, September 04, 2013 7:04 AM
To: Robert Watson
Cc: usrp-users at lists.ettus.com
Subject: Re: [USRP-users] Help: USRP N200 not detected


Thanks Robert. Booting into safe mode and reflashing fixed the problem. 

Just curious, is this a feature or a bug? The earlier USRPs I have used came
with working images, and reflashing was needed only when we tried to change
something. Has this assumption changed?

Thanks again for your help.


On Tuesday 03 September 2013 10:26 PM, Robert Watson wrote:

Hi Mythili, 


I had a similar sounding problem with a recently acquired N200. 


It was similarly unresponsive to pings etc, so I booted it into safe mode
(look here under 'device recovery' for details:
http://files.ettus.com/uhd_docs/manual/html/usrp2.html). Once booted into
safe mode it responded to pings and I reflashed the firmware and fpga
images. After a normal reboot with the newly uploaded images it was fine.
Hope this helps.






On 3 September 2013 13:12, Mythili Vutukuru <mythili at cse.iitb.ac.in> wrote:

Hello all,

Our lab has recently acquired some N200 USRPs with SBX daughterboards. I
have an Ubuntu desktop with a gigabit ethernet interface. I have connected
the N200 + SBX to it via ethernet. I have installed GNURadio + UHD using
Marcus Leech's build-gnuradio script. I have configured a static IP of on my machine. When I power my USRP on, all LEDs except LED B
flash (expected since LED B is MIMO cable which I am not using), and LED F
alone stays on. The ethernet light glows inside the USRP, so I know there
are no loose connections on the netwprk side. Now, the problem is that my
system does not detect the USRP at all.

mythli at mythli:~$ uhd_find_devices
linux; GNU C++ version 4.7.2; Boost_104900; UHD_003.005.003-119-ga812d8a3

No UHD Devices Found

When I open the net burner GUI also, my device does not show up. When I try
to ping, I get no reply. In tcpdump, I see that ARP requests
from my machine for are going unanswered. Here is my machine:

mythli at mythli:~$ uname -a
Linux mythli 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:32:08 UTC 2012
i686 i686 i686 GNU/Linux

While I have used USRP1 + RFX2400 before, this is my first time using N200.
I have googled extensively on this issue, but I am stuck. I am wondering if
I am missing something fundamental in the setup. Any help / tips / pointers
are very much appreciated.


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