[…]The other fun thing about it is that none of the firmware flashing protection is enabled, including Intel Boot Guard. This means running a custom firmware image is possible, and what would a ridiculous custom Thinkpad be without ridiculous custom firmware? A shadow of its potential, that’s what. So, I read the Coreboot[1] motherboard porting guide and set to.[…]
https://mjg59.dreamwidth.org/50924.html
Lenovo should be giving Matthew a free X210 for this effort: