Originally Posted by matchbox2022
Fuuuuuckin gods you guys are.
So bioses have this code in the beginning that never gets overwritten? That means what, there's already key combos or procedures the laptop will recognize even with a corrupted bios? And that it can be reflashed? This is total news to me.
We're getting near the edge of my attained knowledge, take all of this with a few spoonfuls of salt...
Not 'entirely' accurate... but kinda... Bioses CAN have these features, but it depends on the specific mobo designer to implement it. Like, the fail-safe keypress method probably isn't available in my laptop due to the KBC being part of the EC rather than the Super-I/O. This means the 'Early init' required to do this flashing would be:
THEN probe for Keyboard, probe for Floppy Drive, wait for magic key press... etc
After all of that fails, start the normal boot (as in, turn the screen on, re-do all of that, and finally do stuff like test ram, etc). It would REALLY slow down boot times, for a VERY corner case.