We ran out of space with the latest version of the BMP firmware with the memwatch feature enabled, so a larger MCU is needed. Rework of the schematics will be required.
The black pill STM32F411 pinout is specified here: https://github.com/blackmagic-debug/blackmagic/tree/main/src/platforms/common/blackpill-f4
Also see https://black-magic.org/hardware.html
The build that runs out of space is:
make PROBE_HOST=native ENABLE_RTT=1 ENABLE_MEMWATCH=1 -j12