Answer by marcel.tx · Apr 20 at 12:51 PM
Technically one can not really boot any of our modules from an SD card as they are all fused to boot from their on-module non-volatile storage being eMMC in the Colibri iMX6 case and NAND flash on Colibri iMX7. However once the U-Boot boot loader runs you may load any further parts from various other places including SD cards, USB sticks and/or even the network e.g. via TFTP. Some of those options are explained in the following article on our developer website.
Alternatively you may be able to just flash a shim boot wrapper into the on-module non-volatile storage to instruct resp. boot ROM to continue booting from the SD card as e.g. done here for Vybrid.
BTW: You may also find the answer to the following question useful.