Greg,
I exported revision 16:71f51c7 of the mbed-os-example-blinky project
https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-blinky/
to IAR for the MTS Dragonfly platform. The export succeeded and I was also able to successfully build the application by opening the project in IAR and selecting “Project->Rebuild All.” I’m using IAR version
IAR Embedded Workbench for ARM 7.30.4.8187
IAR Embedded WOrkbench common components 7.1.7.3552
An application built for the Dragonfly in IAR won’t run on the target until the MTS bootloader is prepended and the application is padded to a 64kB offset, but that’s another issue.
Could you downgrade your IAR version to 7.30?
Cheers,
Mike