Travis Goodspeed on Twitter: "This is a GD32F130 from GigaDevice, or at least the CPU and RAM of it. It's sort of an STM32 clone, except that it's not the exact counterpart
Porting Apache Mynewt OS to GigaDevice GD32 VF103 on RISC-V | by Lup Yuen Lee 李立源 | The Startup | Medium
STMicroelectronics STM32 to Gigadevice GD32 | Symmetry Electronics