Re: [Xen-devel] [PATCH 6 of 6] arm: Enable VFP at boot

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-06-01 at 10:29 +0100, Tim Deegan wrote:
> At 10:20 +0100 on 01 Jun (1338546010), Ian Campbell wrote:
> > > -CFLAGS += -march=armv7-a -mcpu=cortex-a15
> > > +CFLAGS += -march=armv7-a -mcpu=cortex-a15 -mfpu=vfpv3 -mfloat-abi=softfp
> > 
> > This might have been worthy of a comment...
> 
> Ah, yes it might.  Would you like me to add one and resubmit?

I've already committed. If you feel like it then an incremental patch
might be nice...

> If I get time next week I'm going to look at VFP context switching; at
> that point I might move all the VFP code into its own .c or .S file and
> enable the fpu instructions just there, to be sure that gcc doesn't
> start using the VFP registers in normal Xen code -- it will do that for
> integer arithmetic with -mfpu=neon, for example.  OTOH it might be
> OK to do that as long as there are no caller-save VFP registers; I'll
> have a look at the calling conventions and see what can be done.

OK!



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