Sorry for what might appear as a commercial at first - but I do have
questions at the end - I’ll try to the description short.
We have developed a new RF learning platform  on a standard FMC card
(meets the electrical requirements, not the mechanical - it’s too long)
which can connect to nearly any recent Xilinx development system, that
started showing at X-Fest yesterday.
The advantage of this, vs some existing platforms is bandwidth. The DAC
16-Bit, 1200 MSPS (limited on this platform to 1GSPS, due to the clock
we used), and the ADC is 14-Bit, 250 MSPS. The RF side includes a 400
6 GHz Quadrature Modulator/Demodulator, separate Tx and Rx LO
(35MHz to 4400MHz), and fixed gain on the Tx side, and a Variable Gain
Rx Side. It’s clocking can handle multiple boards attached to the same
(for MIMO), and can sync to a 1 pps (from GPS, or IEEE 1588) to sync
many, many boards together.
The demo we are showing at X-Fest is the FMComms board, attached to a
ML605 FPGA, which runs Linux on Microblaze - playing a tone (Xilinx DDS)
the DAC, modulating that up to 2.4 GHz, sending it out the antenna,
it on the same board, demodulating it (at 2.4GHz), passing it through
VGA, to the ADC, were we capture the samples (into DDR), passing the
GNU plot to create a png, and then passing the png to a web server, so
be displayed on an external client across the network.
We have ported this to the Series 7 platforms - KC705, and others, and
process finishing the port to Zynq - for the standard Xilinx ZC702
platform  and the newly announced Zed. This (I think) is where
get a little interesting. Microblaze running Linux is a little pokey -
on the otherhand - is a dual ARM Cortex A9, running at 800MHz each, plus
fabric - which allows some serious horsepower. This is a kit
that Avnet plans on selling .
Which brings me to the question:
We already have Linux IIO drivers for all the parts on the board
the ADCs and DACs), and are just trying to determine how (if at
this fits within the GNU Radio framework.
When I looked at things (which wasn’t very long) - I didn’t see much in
of native / real time connections to a platform which was running Linux
(PCIe, other other bus). Did I miss something?
Thanks in advance
Just to be fair - others have done the same type of FMC Card  - the
advantage we have is gobs of channel bandwidth - enough to sample all of
bluetooth without doing any hopping at all.
 AD-FMCOMMS1-EBZ HDL Reference Design [Analog Devices Wiki]
Zynq 7000 SoC
 Linux Industrial I/O Subsystem [Analog Devices Wiki]