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PROCESSOR-SDK-J721E: Minimum eMMC boot partition size?

Part Number: PROCESSOR-SDK-J721E
Other Parts Discussed in Thread: DRA829J


I have custom h/w based on the J721e/DRA829J.  The design boots from an eMMC.  What is the minimum eMMC boot partition size?. 

I ask because I currently have an eMMC with a 4MB boot partition and my design is not booting.  I am able to write all the boot code into the eMMC using DFU, OK.