Texas Instruments SimpleLink CC2640 User Manual page 36

Verify in Linker -> Extra Options, the correct iar_boundary.xcl file is included:
II. Select Project→Options→Linker→Config. Paste the following line to 'Linker configuration file':
$SRC_EX$/common/cc26xx/iar/cc26xx_app_oad.icf
And add the following symbol to 'Configuration file symbol definitions':
FLASH_ONLY_BUILD=1
III. Setup the Linker for an image's flash and RAM usage. By default the linker guarantees 10 flash
pages, or 40KB, to the OAD image starting at 0x9000 to Image B. It is generally recommended
that the values for Image B starting address are not changed from the default settings unless
OAD Target App needs to be modified in its size.