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<== Date ==> <== Thread ==>

Subject: Re: EPICS on RTEMS
From: Heinrich du Toit <[email protected]>
Cc: EPICS tech-talk <[email protected]>
Date: Thu, 22 Nov 2007 12:26:45 +0200
Thanks for your reply!

That ColdFire board seem interesting.

But I would like to ask a question to everybody out there working with small boards with RTEMS-EPICS...
What hardware do you use? What's your experience like?


Thanks
-Heinrich


Eric Norum wrote:
We have a number of ColdFire uCDIMM modules with 16 MB of RAM and 4.5 MB of flash.
http://www.arcturusnetworks.com/products/uc5282/
In one of the larger applications (beam position monitor) this handles about 500 PVs.


I think that 16 MB of RAM is probably as low as you'd want to go. I used to run some Motorola 68360 systems with 4 MB of RAM, but that was really limiting.

It depends somewhat on the CPU architecture, but typically an application+EPICS+RTEMS is one to two MB of code space. Here's what the aforementioned BPM IOC uses:
m68k-rtems4.7.1-size srmonopulsebpm/bin/RTEMS-uC5282/srbpm
text data bss dec hex filename
1629008 60032 105520 1794560 1b6200 srmonopulsebpm/bin/RTEMS-uC5282/srbpm


Flash -- you need only enough to do a net boot. 1M would be plenty.


On Nov 16, 2007, at 4:37 AM, Heinrich du Toit wrote:


Hi

Can somebody give me an indication of how much flash/SRAM is needed by a system on RTEMS to run EPICS?

thanks
-Heinrich

--Eric Norum <[email protected]> Advanced Photon Source Argonne National Laboratory (630) 252-4793




Replies:
RE: EPICS on RTEMS Dalesio, Leo `Bob`
References:
EPICS on RTEMS Heinrich du Toit
Re: EPICS on RTEMS Eric Norum

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