I have my CM3L + SATA Adapter + SSD booting up and running. I used the CMIO3 and an SD to set the OTP bit to support USB booting to MSD. Then, after checking to make sure everything was up to date, CM1 eMMC boot partition copied to the SSD, fstab updated correctly, I swapped in the CM3L and it booted the first time.
I can use the CMIO3 and SD card to set up as many CM3 and CM3L boards as I want, for myself or others. The CMIO3 is acting like a catalyst.
