Memory optimization in TF-M enabled applications

Hi, 

We have a project where we are using TF-M application along with DFU and we observe a memory overflow in the TF-M partition when we try to reduce the TF-M partition size.

Attached the memory report.

What is b0 partition and EMPTY_X partitions are used?  How to reduce these partitions size?

We see TF-M is consuming around 270KB and how to reduce this partition at least to its half. 

We basically need the TF-M partition to be minimal to make room for application in non-secure partition.

memory-map.xlsx

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