512KB RAM / 4MB flash but really this is all about https://github.com/rusefi/m74.9/
https://www.arterychip.com/en/product/AT32F435.jsp for ICP tool
https://github.com/rusefi/ChibiOS/commits/stable_20.3.x.rusefi for demo binaries
https://github.com/ArteryTek/openocd or https://github.com/dron0gus/openocd?