An Atmel Xplained board is not recognized by IAR Embedded Workbench for ARM.
Change the selection in...
Project > Options > Debugger > Setup > Driver
...to be CMSIS-DAP.
Then check (and possibly change) the settings in...
Project > Options > Debugger > CMSIS-DAP.
The Atmel Xplained board(s) has an Atmel proprietary on-board debug probe named "Atmel Embedded Debugger (EDBG)". Atmel EDBG uses the CMSIS-DAP communication protocol.
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