I flashed the standard BLACK_F407VE firmware image from the top-of-the-tree code and see only 30kB free memory on an SoC that provides 192kB.

MicroPython v1.26.0-preview.218.g2ce63b142.dirty on 2025-06-18; MCUDEV STM32F407VE with STM32F407VE
Type "help()" for more information.
>>> import gc
>>> gc.mem_free()
29760
>>> gc.collect()
>>> gc.mem_free()
30064

What macros can I set to compile out unnecessary features and how? I don't need networking, webrepl, LWIP, SPI and I2C possibly more.
I have tried setting defines in ports/stm32/boards/BLACK_F407VE/mpconfigboard.h such as below and regenerating the firmware, but it didn't help.

#define MICROPY_HW_HAS_NETWORK      (0)

So, even though this board provides a goodly amount of memory, I can't even run the MicroPython editor here -- fails with memory allocate error.

How do I reduce the memory footprint on this board?

Thanks in advance!