Duo 256M is a compact SBC based on SG2002 multi-architecture SoC
You’ll find hardware documentation – including schematics, PCB layout, and datasheets – on GitHub. Instructions to getting started with buildroot (Linux 5.10 + FreeRTOS), the TDL SDK leveraging the NPU for computer vision workloads (e.g. face detection, face tracking, license plate recognition, gesture detection, etc…), and various code samples for GPIO and other features on the documentation website.
The Duo 256M board can be purchased for $7.99 plus shipping on Arace Tech. If you are interested in building your own board based on SG2000 or SG2002, samples of the chips can be purchased for respectively $6 and $5 each in packs of 5 pieces ($30 and $25).