RTOS does not have absolutely nothing to do with low latency. RTOS is
all about predictability. Somehow, people confuse performance and
RTOS, as if RTOS in it self has better performance. Generally, you
have OS-es with MMU and memory protection, and those without. If you
have MMU, you have to pay for this safety with performance penalty.
So, you have two choices, if you want to increase performance - use OS
without MMU, and sacrifice you application fault tolerance, or move
performance sensitive code inside kernel. Writing intelligent driver
is one way to the second approach. Small, performance sensitive part
of code is executed within kernel, and rest of the application outside
of it, as a normal application.
In newer kernels there is a choice of excluding MMU code, but this is
not reasonable if you application does anything more then just plain
data sampling. And in that case, you have just chosen wrong platform
(there are much cheaper intelligent data sample boards)
--- In "Frank Pagliughi" <> wrote:
>
> I had tried porting eCos to the original TS-7200 board when it first
> came out. Redboot uses a subset of eCos, but just the hardware layer,
> not the scheduler.
>
> Apparently Cirrus did a port for their eval board which is similar to
> the TS-7200, but they never released it publicly - or at least
> wouldn't drop their copyright so that it could be included with the
> eCos distribution.
>
> A recent rumor was that Cirrus dropped their internal development
> project for eCos (and possibly even Linux). There were some promises
> that they would release the code, but I never heard anything.
>
> So eCos isn't an option on these boards unless you want to do the port
> yourself. For more background, just search on "eCos" in this group, or
> on the eCos discussion board:
> http://ecos.sourceware.org/ml/ecos-discuss/
>
> If you need an RTOS and low latency, consider a different board with
> out-of-the-box support.
>
> Frank
>
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