找不到NPU：RKNN_ERR_DEVICE_UNAVAILABLE

参考http://t.rock-chips.com/wiki.php?mod=view&id=36安装了所有的包
解压运行参考样例：
[toybrick@localhost examples]$ python3 ssd.py
  from ._conv import register_converters as _register_converters
--> Loading model
done
--> Building model
done
--> Init runtime environment
done
--> Running model
E NPUTransfer: Transfer interface open failed!, ret = -4
E Catch exception when init model!
T Traceback (most recent call last):
T   File "rknn/api/rknn_base.py", line 625, in rknn.api.rknn_base.RKNNBase.inference
T   File "rknn/api/rknn_runtime.py", line 275, in rknn.api.rknn_runtime.RKNNRuntime.build_graph
T Exception: RKNN init failed. error code: RKNN_ERR_DEVICE_UNAVAILABLE
done


按照论坛信息，NPU的USB id是1808, 而我两块板子，实际lsusb查看都是180a：
Bus 004 Device 002: ID 05e3:0616 Genesys Logic, Inc. hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 007: ID 2207:180a  
Bus 003 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0bda:d723 Realtek Semiconductor Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


npu_powerctl命令倒也能运行，只是总是提示找不到NPU， 请问是什么情况。

求助，急急急！

更新一下NPU相关库试试
  sudo dnf clean all
  sudo dnf update

原来，真相如此简单

多谢！ 已解决