How to check ROM and RAM?

[pass3master]

We are trying to add built-in self-test capability to a program we are developing.
Specifically, we would like to periodically check ROM and RAM. Are there any sample programs for those?

[MCU] STM32F412VGT6

[Tesla DeLorean]

Check for what?

You can CRC or HASH FLASH / ROM as the will have some prescribed content.

I done recall the RAM having any parity or ECC on this model. Could check heap or stack integrity I suppose.