OpenRTOS Cortus collaboration
OpenRTOS and FreeRTOS have just been released for the Cortus APS, a 32bit CPU for small footprint, low power applications.
The Cortus APS3 is a general purpose processor, which has been specifically designed to meet the needs of embedded systems. The 0.04mm2 of silicon (TSMC 65nm) is said to feature 'the lowest available' dynamic power consumption (uW per MHz), as well as a high code density and high performance.
OpenRTOS is a commercially supported rtos based on FreeRTOS.
According to Cortus, the small kernel uses under 10k flash and a few hundred bytes of RAM on the Cortus APS3.