You need to get access to the SPI flash chip on the mother board. They sell some fancy little clips to attach wires, but I just had one of the hardware guys at work tac some wires directly to the chip. Then I used a raspberry pi to flash the image across using their tools. Maybe I had a dodgy connection, but it took several tries of flashing to get it to work correctly.

Once installed it isn't much of a bios. It is mostly just GRUB, you lose all the existing bios settings completely. It lets you boot from different images and thats about it. It does work well once it's set up though.

Here's a few low quality photos of the procedure. http://imgur.com/a/zAQRl

BTW, a really interesting coreboot distribution is https://github.com/osresearch/heads (focused on boot security)

I can't wait to have a note-taking pen tablet laptop thing, battery life is just a big factor for me. I'm a college student and need to be able to run my laptop from 8AM to 12PM. X220 works great for that. X230T is not there yet for me.