Toradex showcased a Heterogeneous Multicore Processing low power use case with the Colibri System on Module featuring an NXP i.MX 7, at IoT DevCon 2017. The i.MX 7 Dual Core Cortex-A7 powers a Linux with Qt user Interface. The i.MX 7 Cortex-M4 core runs FreeRTOS, measures the power and reads out the sensors.
If the user interface is not required, the A7 Cores can be totally switched off, but the system is still able to monitor power and read the sensors. The communication between FreeRTOS and Linux is done via RPMsg.

See the demo live from May 16 – 18, 2017 at the Toradex booth (#851) at IoT World, United States:https://www.toradex.com/events/internet-of-things-world-united-states-2017