TySOM-3A-ZU19EG : PYNQ works but XRT doesn't on its own

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1

I am using the PYNQ 3.0.1 image for the TySOM-3A-ZU1EG board provided by TySOM-PYNQ.

When using PYNQ, everything works flawlessly, but when I try to use XRT on its own through the C++ library, it doesn’t seem to detect any FPGA devices.

The problem arose while testing this project, which is a C++ version of the PYNQ-based FINN driver (https://github.com/Xilinx/finn). Here is the resulting error :

xilinx@pynq:~$ ./build/src/FINNCppDriver/finn --configpath yolo_config.json
Error: Could not open device with index '0'

It seems to be a problem with XRT since xbutil examine returns :

System Configuration
  OS Name              : Linux
  Release              : 5.15.19-xilinx-v2022.1
  Version              : #1 SMP Mon Apr 11 17:52:14 UTC 2022
  Machine              : aarch64
  CPU Cores            : 4
  Memory               : 7950 MB
  Distribution         : PynqLinux, based on Ubuntu 22.04
  GLIBC                : 2.35
  Model                : unknown

XRT
  Version              : 2.13.0
  Branch               : temp
  Hash                 : f5505e402c2ca1ffe45eb6d3a9399b23a0dc8776
  Hash Date            : 2022-10-21 16:39:50
  ZOCL                 : 2.13.0, f5505e402c2ca1ffe45eb6d3a9399b23a0dc8776

Devices present
  0 devices found
BDF  :  Shell  Platform UUID  Device ID  Device Ready*

* Devices that are not ready will have reduced functionality when using XRT tools

However, the fact that the PYNQ driver for FINN still works while the C++ one doesn’t puzzles me, and I hoped to have some insight from people more used to PYNQ’s inner workings than I am.

2

Hi @Mousakaa,

Welcome to the PYNQ community.

Have you tried to run this from inside the Jupyer Lab terminal?

Mario

3

It works. Thank you very much for your time, and I cannot believe I just forgot it needed root permissions.

Arthur

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