Nikita Koss

I tried to create a configuration for Cortex-M4, but immediately found several problems with porting. For some reason Marlin does not support disabling JTAG on the M4, although it is...

According to Artery cross reference table, you may be intrested in STM32F446  platformio has [genericSTM32F446RC](https://docs.platformio.org/en/stable/boards/ststm32/genericSTM32F446RC.html) board

AT32F403A has extra PLL config bits that STM32F103 doesn't have  Also, you may be interested in [Clock Configuration Tool by Artery](https://www.arterychip.com/file/download/1772)