FastRPC CDSP session fails on Dragon Q6A (QCS6490) - error 0x80000600 - NPU not working

[aliekudrot-bit]

Board Information

• Board: Radxa Dragon Q6A
• SoC: QCS6490
• Kernel: 6.18.2-4-qcom
• OS: Ubuntu 24.04.4 LTS

Problem

NPU/DSP cannot be used. FastRPC fails to open CDSP session with error 0x80000600.
All fastrpc_test cases fail. QNN HTP backend cannot initialize.

Error Message

adsp-rpc-remote-heap exists in DTB but cdsp-rpc-remote-heap is missing.

Steps to Reproduce

1. Install: sudo apt install qairt-dsp-binaries task-qualcomm-npu fastrpc-test
2. Run: fastrpc_test → 3/3 FAILED with 0x80000600
3. Run: qnn-net-run --retrieve_context model.bin --backend libQnnHtp.so → Device Creation failure

Expected Behavior

CDSP accessible via FastRPC, NPU inference working with QNN HTP backend

Request

Please add cdsp-rpc-remote-heap reserved DMA memory in DTB for Dragon Q6A board.

[chenchongbiao]

Image: https://docs.radxa.com/dragon/q6a/download

I tried to reproduce this on my side but couldn't trigger the CDSP FastRPC failure.

Please run these and share the output:

ls -l /lib/dsp
sudo dmesg | grep dsp
sudo dmidecode -s bios-version

[aliekudrot-bit]

Hi! Thanks for looking into this.

Would it be possible to share a full backup image of your working Dragon Q6A system (created with the Radxa backup script or "dd")?

A bootable ".img" backup with the NPU/FastRPC/QAIRT already working would help me restore a known-good setup much faster. Even if it doesn't include AI models, just a working NPU environment would be a huge help.

You can upload it to Google Drive, Mega, OneDrive, or any file-sharing service if it's convenient.

I'd really appreciate it. Thank you!