Does the pi firmware for the controller software run as a rtos or does it just run off a pi os ?
If you run the HMI version it’s an image and if you run the other version it runs off pi os…or at least it’s supposed to 
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To expand a bit JB’s answer, even if you install the HMI image, it’s still Rasberry PI’s flavor of Debian Linux, it just has all the extra config files and software located on the system.
There really isn’t much special going on with the OS, as far as non-standard packages, etc. It’s just a really easy way to setup your SD card with little front end effort on the end users part.
I haven’t played with the stand-alone installers yet, but have spent quite a bit of time in the Redline Controller’s guts.
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To answer @022580 ‘s original question. Our motor controller hardware runs the RTOS and the host computer (a Raspberry Pi, Windows, Mac or Linux) runs our graphic user interface software.
The other comments above are also correct. As @L.M mentioned, the Redline version of our software is tailored to their HMI hardware and touchscreen.
We have had several requests for a standalone version of our software that runs on a regular Raspberry Pi distribution. We are working on that now and it should be available shortly.
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So you will eventually have a rtos image for pi ?