I've traced the issue with GDB to
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osalSysHalt("MAC failure");
Using the demo mcuconf.h, chconf.h and halconf.h for this and openocd to flash and program the board with
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openocd -f /usr/share/openocd/scripts/board/stm32h750b-disco.cfg -c "program build/ch.elf verify reset exit"
Not sure what the issue could be, I'm fairly new to embedded systems.