The real realtime preemption end game

I think that the key word is "*usually*". On my UEFI system I build a UEFI program that dump the first 4 bytes of the following address:
- 3GB
- 7GB
- 14GB

Then it sets these bytes to a specific value, and then it dump again.

What I saw is:
1) the first time that I run the program, I saw "random values", like 0 and other non 0 values.
2) the 2nd time that I run the program, I saw the same values that I set in the first iteration.

This proof that UEFI doesn't reset the memory between different program invocation.

Then I "warm rebooted" the system, and I saw the "random values" at 1). So it seemed that in my system the memory is cleared between the reboot.

What I'm telling is that at least some bios clears the memory. In may case (a ASUS B550 desktop mainboard) it seems that the BIOS clear the memory.

What I found is that it is possible to force the BIOS to not clear the memory after a reset [1]. But again this is not typically what happens after a crash; after a crash you push the reset physical buttons.

[1] https://stackoverflow.com/questions/36608101/does-a-soft-...