On 06/06/2018 02:24 PM, Matt Rippa wrote: > Thanks for the fast reply. Of all the mvme boards you listed, > the 3100 hits a nice price point and we're attempting to find > suitable replacement stock > (quantity 30+) > for the 2700 which are no longer > manufactured.
Last I checked (~5 years ago) the newer mvme2500 had a price similar to the mvme3100. The issue was software support. At the time there didn't seem to be RTEMS board support. > Are the 6100 boards on beatnik bsp the only remaining option for RTEMS? > They cost nearly twice as much and have > shown > thermal regulation issues. > > -Matt > > On Wed, Jun 6, 2018 at 11:10 AM, Michael Davidsaver > <mdavidsa...@ospreydcs.com <mailto:mdavidsa...@ospreydcs.com>> wrote: > > Hi Matt, > > The MVME3100 is based on the MPC8540 processor. This chip doesn't have > an FPU. > Other boards do (eg. mvme270x, mvme6100, or mvme2500) and RTEMS supports > this. > > I can certainly confirm that lack of an FPU really hurts performance, even > something as (apparently) simple as integer to float. > > Michael > > > On 06/06/2018 02:03 PM, Matt Rippa wrote: > > 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 > > <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 > > > > > > > -- > _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
