Вот мой собственный батник постлинка. А вообще все в ИАРовском хелпе расписано @echo off
rem ---------------------------------------------
rem Use with arguments (%1 %2 %3):
rem $TOOLKIT_DIR$\bin $TARGET_PATH$ $TARGET_DIR$
rem ---------------------------------------------
%1\postlink.exe -intel-extended -code %2 %3\flash.hex > nul
if errorlevel 1 goto ERROR
%1\postlink.exe -intel-extended -xdata %2 %3\eeprom.hex > nul
if errorlevel 1 goto ERROR
echo Postlink.bat execution was successful.
echo Result is stored as "flash.hex" and "eeprom.hex"
goto END
:ERROR
echo *** ERROR in postlink.bat script
echo *** No output files produced.
:END