Re: Which RTOS as substitution to uC/OS-II?

Altera_Forum · ‎11-28-2005

Hi all,

I've been thinking about trying a different OS than uC/OS-II.

First, I would like to know about the licensing of ucLinux and eCos - are both of them free?

My other question is what are the pros/cons of these systems compared to uC...it's the only OS I've used so far, so any information would be greatly appreciated.

How about some TCP/IP stack? Can I just use lwIP stack with any of them?

Thanks.

Altera_Forum · ‎11-28-2005

Hi CableGuy,

ucLinux and eCos are both under GPL-licence. So it's free, but first read the licenseterms. I believe they both have an TCP/IP-stack of their own which is imho better to start with then the lwIP-stack.

Good luck.

Danny

Altera_Forum · ‎11-28-2005

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originally posted by dannyjacobs@Nov 28 2005, 03:05 AM

hi cableguy,

uclinux and ecos are both under gpl-licence. so it's free, but first read the licenseterms. i believe they both have an tcp/ip-stack of their own which is imho better to start with then the lwip-stack.

good luck.

danny

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Do you know if there is some real drawback of eCOS or Linux compared to uC/OS-II? Is there any reason to avoid these systems from the viewpoint of scheduling, simplicity of use (quite important - uC has an excellent description in the book that came with NiosII devkit), documentation and transparency (since I have never worked with Linux before I am afraid of getting lost in it and not quite understand what exactly I am doing and when...)

Altera_Forum · ‎11-28-2005

Hi CableGuy,

> since I have never worked with Linux before I am afraid of getting lost in it and

> not quite understand what exactly I am doing and when...

I always consider this inevitable when learning something new ... so documentation and

support (along with your own sweat) become really important. If you take some time

to master POSIX (especially pthreads and friends), or if you're already comfortable

with pthreads, you'll do fine with eCos or Linux (and many other RTOS flavors as well).

You might also want to take a look at Nucleus, which now supports Nios-II:

http://www.acceleratedtechnology.com/pressrel/at_niosii.html (http://www.acceleratedtechnology.com/pressrel/at_niosii.html)

http://www.acceleratedtechnology.com/altera/ (http://www.acceleratedtechnology.com/altera/)

I've never used Nucleus ... at least not yet. It's not free, but it does support POSIX,

and you do get the source. From what I've heard so far, the support is good.

Regards,

--Scott