Dear all,we are using the USRP X310 connected over MXI with a PCIe-8371 card. This used to work well up to including Ubuntu 22.04 LTS. Now after updating to Ubuntu 24.04 LTS we are experiencing the connecting issue described in the following. I am aware that 10G Ethernet is the recommended alternative, but the PCIe connection is beneficial for us, as it allows to quickly switch between FPGA images for different applications on-the-fly without having to power cycling the X310 (remote operation). According to NI, RIO is fully supported on Ubuntu 24.04 LTS so it should work.
Does anyone have experience with this on Ubuntu 24.04 LTS or any suggestions how to identify and fix the issue would be welcome!
*Issue description:*The USRP X310 is discoverable using "uhd_find_devices" and shows up correctly as resource RIO0. It's correctly enumerated in lspcie using niusrpriok drivers and the niusrpriopc service is running. However, everything beyond that does not work, i.e. any flowgraph fails. Even the "uhd_usrp_probe" fails with the following after a clean reboot:
$ uhd_usrp_probe[INFO] [UHD] linux; GNU C++ version 13.3.0; Boost_108300; UHD_4.9.0.0+ds1-1~noble2
[INFO] [X300] X300 initialization sequence... [INFO] [X300] Connecting to niusrpriorpc at localhost:5444...[INFO] [X300] Using LVBITX bitfile /usr/share/uhd/4.9.0/images/usrp_x310_fpga_HG.lvbitx Error: RuntimeError: x300_impl: Could not initialize RIO session. Unknown error. (Error code -63150)
$ uhd_usrp_probe[INFO] [UHD] linux; GNU C++ version 13.3.0; Boost_108300; UHD_4.9.0.0+ds1-1~noble2
[INFO] [X300] X300 initialization sequence... [INFO] [X300] Connecting to niusrpriorpc at localhost:5444...[INFO] [X300] Using LVBITX bitfile /usr/share/uhd/4.9.0/images/usrp_x310_fpga_HG.lvbitx Error: RuntimeError: x300_impl: Could not initialize RIO session. A fault on the network caused the RPC operation to fail. (Error code -63042)
And every subsequent try results in the same network fault error. *Setup:* * USRP X310 connected over MXI with a PCIe-8371 card. Ubuntu 24.04 LTS x86_64 with Kernel 6.8.0-90-generic * UHD 4.9.0.0+ds1-1~noble2 and GNU Radio 3.10.12 stack installed via the ppa:gnuradio/gnuradio-releases repository * NI drivers 2025 Q4 installed as described here: https://files.ettus.com/manual/page_usrp_x3x0.html#x3x0_hw_pcieDoes anyone have experience with this on Ubuntu 24.04 LTS or any suggestions how to identify and fix the issue would be welcome!
Best regards Philipp
smime.p7s
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