440EP FPU patch

[Tom Rini]

On Thu, Mar 31, 2005 at 12:45:44PM -0600, Kumar Gala wrote:
> Tom,
> 
> On Mar 31, 2005, at 10:34 AM, Tom Rini wrote:
> 
> >On Thu, Mar 31, 2005 at 09:26:18AM -0700, Wade Farnsworth wrote:
> > > On Fri, 2005-03-18 at 12:30, Tom Rini wrote:
> > > > On Fri, Mar 18, 2005 at 01:43:11PM -0500, Jason McMullan wrote:
> > > > > On Fri, 2005-03-18 at 10:06 -0600, Kumar Gala wrote:
> > > > > > Can you build your patch for the lopec_defconfig and fix the 
> >errors
> >> > > > associated with enabling altivec.
> > > > > >
> >> > > > Looks like you need to include asm/offset.h & asm/page.h in 
> >vector.S,
> >> > > > however there is another build error after that.
> > > > >
> >> > > Thanks! That also found a linking bug, fixed in this patch.. 
> >Please
> > > > > double check the call in 'AltiVecUnavalible' in head.S, and the 
> >re-load
> > > > > of 'ctr' at the end of load_up_altivec, as I do not have an 
> >AltiVec
> > > > > machine here.
> > > >
> >> > No dice:
> > > > VFS: Mounted root (nfs filesystem) readonly.
> > > > Freeing unused kernel memory: 100k init 4k prep
> > > > floating point used in kernel (task=c03816b0, pc=c000d664)
> >> > Doing some objdump'ing, that's the start of load_up_altivec.
> >>
> >> Hi Jason and Tom,
> > >
> >> Has there been any more progress on this patch?
> >
> >Sadly no.? We got to the point where it was reliably crashing on my
> >LoPEC (7400), but no time to try and fix it.? The problem should show 
> >up
> > on any classic PPC box..
> 
> Is it crashing on just avec code or everything?

That's a good question.  IIRC, I was using a userspace with an
altivec-using setjmp/longjmp, so it could have been Altivec-specific.
I don't have test kernels w/ the patch handy anymore to verify, sorry.

-- 
Tom Rini
http://gate.crashing.org/~trini/