Exists port FreeRTOS for "QN902X Ultra-Low Power BLE SoC - NXP" (http://eu.mouser.com/new/NXP-Semiconductors/nxp-qn902x/)?
I'm not aware of a pre-configured demo for that part, but FreeRTOS will run on any Cortex-M0 that has adequate RAM. Here are some links that might help you:
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