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