I boot from NAND (onboard 4GB eMMC).
Yes, my version of u-boot is 2015.04 and kernel is 3.14.28 for Toradex Colibri iMX6DL.
I didn't do registration process to get free sample, I bought one for tests and before they can send it - I had to sign a paper from freescale and resend to Toradex (counter terrorist precautions). About business card, I think that they only want to send your name, business premises (address where to send sample), mail contact and maybe some reference (web page).
I don't know if I fully understand how to put things together, I can try to do that, but I will need some help to do it - and I would like to try it.