Hello virendra,
Unfortunately we don’t have a BSP for K61 devices, it is necessary to create or clone your own BSP; however you can use the MQX BSP Cloning Wizard and use the twrk60f120m for board base. Then it is necessary to modify the pin definitions according with the K61 package. You can find the pin definitions in the init_xxxx.c files (MQX_install_path\mqx\source\bsp\twr_new_BSP).
In your case you need to change the core frecuency, for do that you need to check the “How-to Change Default Clock Settings in Kinetis BSPs” document that you can find at the path: C:\Freescale\Freescale_MQX_4_1\doc\tools\cw (it is attached to this thread too)
Have a great day,
Sol
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