EPICS Home EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

Format page
for printing


Search Tech-talk
1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  <2014>  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  <2014>  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>
Subject: Re: New standards for small and medium sized astronomical observatories
From: Joel Sherrill <[email protected]>
To: Eric Norum <[email protected]>, "Hill, Jeff" <[email protected]>
Cc: "Tech Talk \([email protected]\)" <[email protected]>
Date: Thu, 10 Jul 2014 12:56:27 -0500

On 7/10/2014 12:53 PM, Eric Norum wrote:
On Jul 10, 2014, at 9:32 AM, Hill, Jeff <[email protected]> wrote:


My configuration of the RTEMS netdemo application {compact real time kernel, network kernel } would not fit in 100KB, and this is sans EPICS.  The netdemo object code appears to require more like 500 KB. I believe that RTEMS has a reputation for being a fairly compact RTOS, but a complete implementation of the network kernel probably requires more space. I also have the c++ libraries and additional bells and whistles configured into RTEMS so YMMV.
 
Yeah, the network stack in RTEMS is pretty big.  That’s because I used the BSD Unix network stack as a starting point to port to RTEMS.   It would be really good if someone did the port of LWIP to RTEMS.  I think that would be a much better fit for embedded applications.  But even then EPICS core is going to have a pretty large memory footprint.

Nice to hear from you Eric. :)

There is a port of an old version of LWIP. It might be of use in getting a new
version running. The person who did this port didn't make their code available
until LWIP had moved forward and they didn't have interest in getting their
work merged.  It is critical when porting something to RTEMS to get the
work pushed upstream.

http://www.rtems.org/ftp/pub/rtems/people/joel/rtems-lwip/

I know it is old but maybe it will help.

-- 
Eric Norum
[email protected]
 


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
[email protected]        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
Support Available                (256) 722-9985
References:
New standards for small and medium sized astronomical observatories Piotr Sybilski
RE: New standards for small and medium sized astronomical observatories Dalesio, Leo
RE: New standards for small and medium sized astronomical observatories Piotr Sybilski
RE: New standards for small and medium sized astronomical observatories Hill, Jeff
Re: New standards for small and medium sized astronomical observatories Eric Norum
Navigate by Date:
Prev: Re: New standards for small and medium sized astronomical observatories Eric Norum
Next: Re: New standards for small and medium sized astronomical observatories Timo Korhonen
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  <2014>  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: Re: New standards for small and medium sized astronomical observatories Eric Norum
Next: Re: New standards for small and medium sized astronomical observatories Jitendra Kodilkar
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  <2014>  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 17 Dec 2015 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·