Pre-installation problems: Thinkpad X220 won't boot from USB - Hardware - Ubuntu MATE Community
Dima on Twitter: "Alright, AX200 is installed on ThinkPad X220. To make it possible you want to: 1. Buy an M.2 NGFF to mPCIe adapter 2. Buy MFH4 (female) to IPEX/UFL (male)
Johannes' Blog - Coreboot on the Lenovo Thinkpad X220
How To Enter BIOS Setup Menu On Lenovo X220 - YouTube
Lenovo ThinkPad X220 X230 Bios Password Bin File - AliSaler.com
Boot entries keep accumulating / ThinkPad X220 does not wake up from suspend-to-ram · Issue #52 · rhboot/shim · GitHub
Coreboot on the ThinkPad X220 with a Raspberry Pi - Tyler Cipriani
Updating the BIOS on your Thinkpad X220: Unlock your Laptop! (Plus Hot Drive/OS Swapping) - YouTube
X220 BIOS Update with Archlinux - YouTube
Karl Cordes - How to flash coreboot on Lenovo X220
Coreboot on the ThinkPad X220 with a Raspberry Pi - Tyler Cipriani