UHD + RFX2400 warning while running benchmark_rx_rate

GNU Radio
1

Hello all,
I’m trying to ramp up on the progress that the UHD has been making
lately. Initially, I’m using the stable FPGA bitstream and firmware
binaries from July 6th, which can be downloaded from:

http://code.ettus.com/redmine/ettus/projects/public/wiki/U2binaries#UHD-Firmware-and-FPGA-Images

I got libuhd built, and after a bit of mucking around was able to get
uhd_find_devices to see my USRP2.

However, when I went to run benchmark_rx_rate with my USRP2 + RFX2400
(rev30, dated 12/2/2006), I’m seeing a warning where the dboard
doesn’t seem to be recognized. Here is a snippet of output from
benchmark_rx_rate:

[root@epiq-laptop1 examples]# ./benchmark_rx_rate

Creating the usrp device with: …
Target recv sock buff size: 50000000 bytes
Actual recv sock buff size: 131071 bytes

Warning:
The recv buffer is smaller than the requested size.
The minimum recommended buffer size is 50000000 bytes.
See the USRP2 application notes on buffer resizing.

Warning: unknown dboard-id or dboard-id combination: unknown (0xffff)
→ defaulting to the unknown board type
Warning: unknown dboard-id or dboard-id combination: Flex 2400 MIMO B
TX (0x002b)
→ defaulting to the unknown board type
Using: Unknown - unknown (0xffff)
Using: Unknown - Flex 2400 MIMO B TX (0x002b)
RX samples per packet: 362
TX samples per packet: 363
Recv pirate num frames: 89
Using Device: Simple USRP:
Device: usrp2 device
Mboard: usrp2 mboard0 - rev 4:0
RX DSP: usrp2 ddc0
RX Dboard: usrp2 dboard (rx unit)
RX Subdev: Unknown - unknown (0xffff)
TX DSP: usrp2 duc0
TX Dboard: usrp2 dboard (tx unit)
TX Subdev: Unknown - Flex 2400 MIMO B TX (0x002b)

OTesting receive rate 0.500000 Msps (10.000000 second run)

Received packets: 13813
Received samples: 5000306
Lost samples: 0
Lost packets: 0 (approximate)
Sustained receive rate: 0.500000 Msps

Other than the fact that the socket buffers need to be increased, it
appears as though it works. But the warning indicating (twice?) that
there is an unknown dboard-id/board type is concerning. I’ve seen
traffic of other folks using UHD + the RFX2400, such as:

http://www.mail-archive.com/[email protected]/msg24051.html

…so I’m fairly certain the RFX2400 is supported. Any ideas as to
what the issue could be here?

Any insight is appreciated.

–
John O.
CEO/System Architect
Epiq Solutions

2

Its reading something bad out of the rx eeprom (tx seems correct). Is
your rfx seated properly? It should read 0x0027.

-Josh

3

Its reading something bad out of the rx eeprom (tx seems correct). Is your
rfx seated properly? It should read 0x0027.

Ahh…I had tried power-cycling previously, without success, but
hadn’t tried re-seating the RFX2400. Upon re-seating, I am now able
to get the RFX2400 to be properly recognized (both tx and rx EEPROMs),
and benchmark_rx_rate passes all tests successfully. Must have had an
intermittent connection.

Thanks Josh.

–
John O.
CEO/System Architect
Epiq Solutions