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CC2640R2F: How to increase the size of OAD Target App A

Part Number: CC2640R2F

Implementing OTA on-ship.  I would like to add a serial port to the Target App for debugging purposes.  Adding drivers grows the image 7k.  Now I get a message in flash programmer 2:  "an overlap at page 17".   I get the same message if i load the bim+target_app+stack (no application).  I read about the frontier tool.  It speaks of the stack/app boundary, but it is not clear what I am adjusting.  The target_app is far away from the stack in flash memory.  

Specific question.  What do I adjust to increase the size of Target App (Image A) from 43k to 50k.