I would recommend to use Solution Advisor tool, which provides pin mux checking function for Kinetis product.
More detailed info, please check below link:
Solution Advisor: Interactive Product Selecto|Freescale
About Flexbus application, there is an application note AN4393 about how to use Kinetis Flexbus module.
http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4393.pdf
Wish it helps.
best regards
Ma Hui
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