You can also use the IAR Postlink utility, delivered with the AVR IAR C/C++ Compiler
to generate multiple output files. This application takes as input an object file (of the
XLINK simple format) and extracts one or more of its XLINK segment types into one
file (which can be in either Intel extended hex format or Motorola S-record
format). For example, it can put all code segments into one file, and all EEPROM
segments into another.
See the postlink.htm document for more information about IAR Postlink.