Re: [OT] An embedded RTOS ANSI/POSIX compatible

[David Given <dg@cowlark.com>]

On 2010-08-05 01:42, Alan Carvalho de Assis wrote:
[...]
> I found an interesting RTOS which could fit where Linux (uClinux) can
> fit: deep embedded system (<100KB Flash,<2KB RAM).

You might also be interested in Prex:

http://prex.sourceforge.net/

It's a very elegant microkernel operating system, also BSD licensed. 
It's bigger than NuttX but it will (optionally) support MMU. There's a 
Posix layer that can be used to run userland programs complete with 
fork() and vfork() (hardware allowing).

I recently ported it to the Cybiko to see what it was like. The Cybiko 
is an H8-based device with 256kB flash and 256kB RAM; it ran fine, but 
the developer shell was rather too big to be useful!

It really requires a 32-bit processor, but it may be possible to wedge 
it into a 8088 given the right compiler in huge mode.

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