$239 is a lot of money for a meme. The processor looks just as closed as a raspberry pi
The processor avoids being closed by not having a GPU.
So where's the RTL for the processor then?
The RTL is on GitHub under the Apache2 license: https://github.com/T-head-Semi/openc906
Yocto project in https://github.com/T-head-Semi/xuantie-yocto