[ECOS] FPU support for PowerPC MPC8xxx

agyhoo agyhoo@yahoo.com
Wed Mar 10 14:16:00 GMT 2004


Hi Gary,

Thanks for your response. I was able to get the s/w
floating point feature working....there was a configuration
option for printing floating point format in the printf
functions that was turned off.

I did notice that the CYGHWR_HAL_POWERPC_FPU option
(presumably for the h/w FP support) was turned on for the
8260. Is this a mistake then or is h/w FP support available
for that specific variant?

- Anunoy

--- Gary Thomas <gary@mlbassoc.com> wrote:
> 
> agyhoo said:
> > Hi,
> >
> > Is there support for the FPU in the PowerPC MPC8xxx HAL
> > variant? Looking at the CDL file, it seems that there
> isn't
> > (the cdl for the MPC8260 variant however does support
> it).
> >
> 
> Currently, it's turned off.  It would be some effort to
> get it
> working on the PowerPC.
> 
> > I am trying to execute a calculate a simple FP
> expression
> > but I keep getting integer results.
> 
> There is software floating point available.
> 
> Can you share what you've tried?  It may just need a
> little
> tweak to get going (at least with the software version).
> 


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