On Wed, Jun 6, 2018, 4:29 PM Michael Davidsaver <mdavidsa...@gmail.com> wrote:
> 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 > I would expect the mvme2500 to just one of the many variants supported by the motorola_powerpc BSP family. Some of the board variants, you could just use another variant name. I don't know if this would require tweaks or not. What about the mvme5500? It wasn't mentioned by anyone. Is that a price issue? I suppose spinning off Motorola Computing Group and the processor group has resulted in few upgrade options. > > > 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
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