This is a yotta target description for compiling for Freescale's Kinetis K22F family of microcontrollers. Currently only the MK22FN512VLH12 is supported. You should not normally use this target description directly, but instead use a more specific description of a target board.
This target description inherits from the generic mbed-gcc target description, which provides most of the information about how to run the compiler.
To build for the FRDM K22F development board, use the frdm-k22f-gcc target description (which inherits from this one). The frdm-k22f target description also provides a good starting point to copy if you are creating a new target description for your own board using a K22F microcontroller.