-m8k
-m128k
-m8m
This option instructs the compiler to generate code for a standard AVR core with 8 kilobytes, 128 kilobytes, or 8 megabytes of code memory. The compiler uses this information to select the correct size of jump and call instructions for the selected code size.
The correct CPU type is selected when you select or change your project's target processor. You can override this but we strongly discourage you from doing so.