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TMS320F280039: secure boot and Zone

Part Number: TMS320F280039

Tool/software:

Hello,

In the TRM, "the Flash sector that encompasses the configured Flash entry point and the first 16KB of Flash is assigned to Zone 1 for the core setup for secure Flash boot."

But I do not assign any flash sector to Zone, the secure boot run normal, can branch to customer boot.

Is it necessary to assign the Flash entry point and the first 16KB of Flash to Zone 1?