This video shows how to install Coreboot on a Thinkpad T440p. The whole process took me about 3 hours so I sped up a lot of the video to make it easier to watch. I also included some tips I thought where helpful. 

Blog that has instructions: https://blog.0xcb.dev/lenovo-t440p-coreboot/
T440p disassembly video: https://www.youtube.com/watch?v=frlKmVP-4dc
Bitmap tool for bootsplash: https://online-converting.com/image/convert2bmp/
CH341a 3.3V mod: https://www.chucknemeth.com/usb-devices/ch341a/3v-ch341a-mod

If you like the music be sure to check out WoodyJ: https://www.youtube.com/channel/UCZKlv7rWb7EoYyYMO-wshig

CHAPTERS
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0:00 Intro
0:08 Instructions/Tools
0:36 Disassembly 
1:23 Backup stock BIOS
3:45 Building Coreboot
9:46 Flashing Coreboot
11:11 Testing Laptop
11:30 Why coreboot?
11:57 Outro