Hello @deepanr welcome to Mender Hub. It’s likely going to require some experimentation on your part to enable Mender on the raw-flash system. The parameters needed are going to depend heavily on the specific hardware in use. The best place to start is here: https://docs.mender.io/2.2/devices/yocto-project/raw-flash.
You can also see Toradex Colibri iMX7 Dual 512MB / Colibri iMX7 Solo 256MB which is an existing i.MX7 port to a Toradex board using raw flash.
If you post specific issues and details of your hardware we may be able to guide you further.
Drew