Dear sir, I have signed uboot & using kernel 4.9.11 for secure boot running on i.MX6-based board.Reference https://community.nxp.com/docs/DOC-330622,I want to encrypt uboot ,but need to burn OTPMK by nxp factory. So, I change the cst file (ZMK from SNVS).but i do not know how to encrypt / decrypt by ZMK, can you provide assistance?