[coreboot] Compatibility with legacy boards

[Benoît Dufour]

Hello,
I saw one of my old board is listed compatible on the CoreBoot wiki :
https://www.coreboot.org/Board:asus/p5gc-mx
but knowing the wiki is "being retired".
I don't know if it is still supported by the latest version of CoreBoot.

Then the Status (as of commit 5bb27b7815) chart has broken colors.
So it is hard to me to tell if everything is working fine or not.

Then my board is the P5GC-MX/1333 and not the P5GC-MX.
I could attempt to flash the Coreboot BIOS to it, but
I would want to know if it could bring me some advantages other than
"it is free software". For example, the original manufacturer BIOS
doesn't supports booting from USB, does CoreBoot supports it?