Linux recommended / compatible RTOS

Posted Sep 3, 2014 11:31 UTC (Wed) by pizza (subscriber, #46)
In reply to: Linux recommended / compatible RTOS by tdwebste
Parent article: Kernel tinification

> These processors usually have under 512k flash and 64k ram.

Indeed, 512/64 is actually a pretty high-end part.

> Recommended opensource Linux compatible RTOS?
> Compatible: Event queue, Asynchronous message queue, mailbox intercommunication.

In short, such a thing does not exist, at least not if you're looking to be API-compatible with Linux. Or even behaivorally-compatible.

Come to think of it, eCOS may be the closest, but by the time you enable all the nice APIs and features the RAM/Flash requirements are such that you may as well be running uClinux.

nuttx is pretty full-featured too at this point, and RTX has been freed by ARM and is actually bundled with CMSIS these days. Personally, I'm particularly fond of FreeRTOS, but it's fairly bare bones in comparison to the others.