Re: arm software floating point support going forward

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On Fri, 25 Jan 2013, Josh Boyer wrote:

> On Fri, Jan 25, 2013 at 11:22 AM, Dennis Gilmore <dennis@xxxxxxxx> wrote:
> > Hi all,
> >
> > I wanted to kick off a discussion, I think that with the work that
> > Seneca is doing for armv6hl to support the Raspberry Pi most of the
> > need for building sfp has gone away. I would like us to drop support
> > for sfp in F19 that means that anyone running a kirkwood based system
> > would get supported software updates for approximately 13 months from
> > now. with cubie boards and other devices coming around that are cheap
> > and more powerful and similar options I think there is little benefit
> > to continuing to support sfp.
> 
> I'm not overly familiar with arm, but from a kernel standpoint you might
> be able to enable floating point emulation. That would let you run the
> hardfp binaries on the boards without an FPU.

No, you can't.

The only FP emulation the ARM kernel provide is for the antique FPA 
instruction set that almost never got implemented in hardware, except 
for a few exceptions that Linux never supported anyway.

All modern EABI compliant binaries are using the VFP instruction set, 
and the only thing the kernel implements is the processing of 
exceptions for them.  To have a full VFP emulation support in the 
kernel, significant development effort would be needed.


Nicolas
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