Try and see if you can find any stolen code here[0] or here[1].
Cheers.
I wouldn't quite say that's the case. Two of the three full Linux capable RISC-V SoC releases this year are using open source CPU cores. The BL808 and the Allwinner D1 both use T-Head CPU cores that are available on GitHub https://github.com/T-head-Semi/openc906 . The JH7110 in the VisionFive2 and Star 64 does use a closed CPU core however.
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