On 21/02/2023 11:53, Maxim Belotserkovsky wrote:
Hi everyone. Got a brand-new B200-mini device, installed all the tools
etc. Ubuntu sees the device correctly once it's attached to the host:
<home>:~$ lsusb
Bus 001 Device 004: ID 2500:0021 Ettus Research LLC USRP B200-mini
...........
However, any attempt to run initial UHD verification (as per
https://kb.ettus.com/Verifying_the_Operation_of_the_USRP_Using_UHD_and_GNU_Radio),
for example, by running uhd_find_devices, fails in the following way :
<home>:~$ uhd_find_devices
[INFO] [UHD] linux; GNU C++ version 11.3.0; Boost_107400;
UHD_4.4.0.0-0ubuntu1~jammy1
[INFO] [B200] Loading firmware image:
/usr/share/uhd/images/usrp_b200_fw.hex...
No UHD Devices Found
--------------------------
When I re-run 'lsusb' now, The 'B200' device no longer shows up:
<home>:~$ lsusb
..................
-------------------------------------
At this point, it now requires power-cycling the B200 in order for it
to be recognized by the OS again (which presumably re-loads the
default factory image that comes on the built-in flash)
So, the problem is this: it appears as if in the process of loading
the firmware image (which comes as a part of running any of the UHD
utilities) the device loses connection to the system, causing it to no
longer enumerate on the OS, so that the subsequent steps (of
'uhd_find_devices' in our example) can no longer be executed (due to
'No UHD Devices found').
The questions I have are these :
1) Is this something generally known, with a known solution, or is
there something wrong with my particular system, the B200 device,
driver installation etc.?
2) Is the problem really caused by the FPGA image loading, or some
other non-FPGA component being disturbed causing the device to
disconnect? Is it possible the image attempted to be loaded the wrong
one( usrp_b200_fw.hex incompatible with the hardware)?
2) Is there a work-around? For example (preferred by me): can I run
UHD with the option passed to commands of not-loading the FPGA image
every time a command is executed? Say, a config file that UHD reads to
know what to do with the device? I want to be able to deal with the
B200 with whatever static image I've loaded up on it (be it the
factory image or some future custom image)
Thank you.
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What version of Ubuntu? What type of hardware?
This might be that the USB controller on your host is dropped the device
off the bus due to power-consumption.
The FPGA/Firmware are only loaded during *cold start* of the
device--that is after a power cycle. Once it is loaded, as long
as it's plugged in, and you don't ask for a different FPGA image, it
will continue to run with that image.
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