The hw/arm/stm32h753zi.c file is based on the hw/arm/mps2.c code is of version 5.2.0. The memory map for RAM has not changed from the mps2.c code. Therefore, in order to emulate, you have to change the linker file from real target to QEMU target.
It would be good to emulate the flash and ram properly using the right address space. Correcting this may also enable interrupts correctly (at the moment, an interrupt pushes the code to nowhere).
The hw/arm/stm32h753zi.c file is based on the hw/arm/mps2.c code is of version 5.2.0. The memory map for RAM has not changed from the mps2.c code. Therefore, in order to emulate, you have to change the linker file from real target to QEMU target.
It would be good to emulate the flash and ram properly using the right address space. Correcting this may also enable interrupts correctly (at the moment, an interrupt pushes the code to nowhere).