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

Subject: MVME3100 FPU Support on RTEMS 4.10.2
From: Matt Rippa <mrippa@gemini.edu>
To: Talk EPICS Tech <tech-talk@aps.anl.gov>, Till Straumann <strauman@slac.stanford.edu>, Michael Davidsaver <mdavidsaver@ospreydcs.com>, "rtems-users@rtems.org" <users@rtems.org>
Date: Wed, 6 Jun 2018 11:03:45 -1000
It appears we've compiled our mvme3100 bsp without FPU support.
We're on the mvme3100 running EPICS 3.14.12.7 and RTEMS 4.10.2.

We're attempting to commission our astrometric kernel control system
and we've run into trouble meeting some of our thread deadlines. What
we've found is a transform routine that takes our mvme2700 ~200 us,
takes the mvme3100 ~8 ms.  So not a surprise to see this with only "-msoft-float"?  

...
2018-05-31-tcs.log:May 31 11:41:15  E) PORT: tcs_vme, MSG: Welcome to rtems-4.10.2(PowerPC/Generic (no FPU)/mvme3100) 

Is FPU support possible with RTEMS 4.10.2? If so, what would we need to do?
It looks like there's a multilib on 4.11.2 https://docs.rtems.org/releases/rtems-docs-4.11.2/cpu-supplement/powerpc.html#multilibs(Eg., see #13 )

Here's our bsp specs:

beatnik:
-specs bsp_specs -qrtems -fasm -c -mcpu=7400 -D__ppc_generic -DUNIX -O2 -g -g -Wall
(mvme2700) mvme-2307:
-specs bsp_specs -qrtems -fasm -c -mcpu=604 -mmultiple -mstring -mstrict-align -meabi -DUNIX -O2 -g -g -Wall
mvme-3100
-specs bsp_specs -qrtems -fasm -c -mcpu=powerpc -msoft-float -D__ppc_generic -DUNIX -O2 -g -g -Wall

Thank you!
-Matt


Replies:
Re: MVME3100 FPU Support on RTEMS 4.10.2 Michael Davidsaver

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