440EP FPU support missing
jwboyer at jdub.homelinux.org
Thu Nov 10 03:50:33 EST 2005
On Tue, 2005-11-08 at 16:02 -0700, Matt Porter wrote:
> On Tue, Nov 08, 2005 at 04:32:54PM -0600, Josh Boyer wrote:
> > On Tue, 2005-11-08 at 15:30 -0700, Matt Porter wrote:
> > > On Tue, Nov 08, 2005 at 06:38:11PM +0100, Stefan Roese wrote:
> > > > In the current linux version, Bamboo (440EP) won't compile anymore, because of
> > > > missing fpu support:
> > > >
> > > > make uImage
> > > > ...
> > > > LD init/built-in.o
> > > > LD .tmp_vmlinux1
> > > > arch/ppc/kernel/head_44x.o(.text+0x868): In function `_start':
> > > > : undefined reference to `KernelFP'
> > > > make: *** [.tmp_vmlinux1] Error 1
> > > >
> > > > Somehow arch/ppc/kernel/fpu.S has disappeared. :-( I assume, this happened in
> > > > the ppc/ppc64 -> powerpc merge. Any thoughts, why this file disappeared and
> > > > how to solve this problem (just restore the original file)?
> > >
> > > arch/powerpc/kernel/fpu.S is being used now which doesn't have KernelFP.
> > > I don't know why the 44x fpu support wasn't using
> > > kernel_fp_unavailable_exception() before but I must have missed that
> > > reviewing it.
> > >
> > > Try this patch.
> > Doesn't this render the 440EP's FPU useless?
> Does what render the 440EP's FPU useless? The supplied patch? I
> don't think so, the path should be the same as classic PPC.
> The patch simply replaces the KernelFP routine that used to be in
> arch/ppc/kernel/fpu.S (and was removed inadvertently in the arch/powerpc/
> merge) with a kernel_fp_unavailable_exception() call which does the
> equivalent and is shared by others.
> The exception still loads up the fpu is coming from userspace and
> only goes down this path when getting an FP unavailable exception from
> kernel space.
Yes, you're obviously right. I blame my idiocy on lack of coffee.
Sorry for the noise.
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