hi,
an4379 can work for TWR-K60512. i don't think we have a porting guide for other kinetis device.
as a choice, I suggest you use KBOOT.
Kinetis Bootloader|Freescale
it includes demo coe for K22FN. It also easy to be used on your device,
Hope this helps!
Have a great day,
Zhang Jun
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------