PowerPC BSP mvme5500 and hardfloat.

[Joel Sherrill]

GCC for the PowerPC will use floating point registers when you don't expect. Because of this all tasks are implicitly float on PPC. But in the bsp, there is concern for accidentally using the FPU in an ISR. This may be the sole reason soft float is used here.

Would love to hear from Kate or another PowerPC BSP folks.

On Dec 10, 2013 9:05 AM, Chirayu Desai <chirayudesai1 at gmail.com> wrote:
Sorry for not being clear earlier, I want to know whether -msoft-float is required or not.
If someone using the git HEAD (or RTEMS 4.10 or above) can verify that it is working without a problem, that would be great.
-msoft-float was removed in rtems.git commit 7425411ff581a8f5c92a1266085e7eb1f4debd2b,


On 10 December 2013 22:29, Chirayu Desai <chirayudesai1 at gmail.com<mailto:chirayudesai1 at gmail.com>> wrote:
Hi,

https://www.rtems.org/bugzilla/show_bug.cgi?id=1323
There is still an uncertainty regarding that bug, as the hardware does have a FPU, but looks like it was removed for some reason.


git says this was introduced by commit ee732739bf9021a7a22de95eca9095c49b1d9169

commit ee732739bf9021a7a22de95eca9095c49b1d9169
Author: Joel Sherrill <joel.sherrill at OARcorp.com<mailto:joel.sherrill at OARcorp.com>>
Date:   Thu Sep 13 14:26:24 2007 +0000

    2007-09-07      Kate Feng <feng1 at bnl.gov<mailto:feng1 at bnl.gov>>

        * ChangeLog, Makefile.am, README, README.booting, README.irq,
        preinstall.am<http://preinstall.am>, GT64260/MVME5500I2C.c, include/bsp.h, irq/irq.c,
        irq/irq.h, irq/irq_init.c, pci/detect_host_bridge.c, pci/pci.c,
        pci/pci_interface.c, pci/pcifinddevice.c, start/preload.S,
        startup/bspclean.c, startup/bspstart.c, startup/pgtbl_activate.c,
        startup/reboot.c, vectors/bspException.h, vectors/exceptionhandler.c:
        Merge my improvements in this BSP including a new network
        driver for the 1GHz NIC.
        * network/if_100MHz/GT64260eth.c, network/if_100MHz/GT64260eth.h,
        network/if_100MHz/GT64260ethreg.h, network/if_100MHz/Makefile.am,
        network/if_1GHz/Makefile.am, network/if_1GHz/POSSIBLEBUG,
        network/if_1GHz/if_wm.c, network/if_1GHz/if_wmreg.h,
        network/if_1GHz/pci_map.c, network/if_1GHz/pcireg.h: New files.


Anybody here who can test this on actual hardware and verify what is wrong with this?


Thanks.

Chirayu Desai

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