aggregated from various sources:
- https://github.com/lennvn/hc32f46x_gcc
- https://github.com/SoCXin/HC32F460
- https://github.com/wellrun/hc32f460
- https://github.com/yanjainxiong/HDMCU_ZLG
- full marlin firmware source by voxelab provided by email
- https://www.hdsc.com.cn/Category83-1487