This is a yotta target description for compiling for Freescale's Kinetis K64 family of microcontrollers. Currently only the Mk64Fn1M0Vll12 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 K64F development board, use the frdm-k64f-gcc target description (which inherits from this one). The frdm-k64f target description also provides a good starting point to copy if you are creating a new target description for your own board using a K64F microcontroller.