Hi Mónica
please check *.cfg files on below link
uboot-imx.git - Freescale i.MX u-boot Tree
also check attached Porting Guide Chapter 1
Porting U-Boot from an i.MX 6/7 Reference Board to
an i.MX 6/7 Custom Board
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------