linux-kernel - Re: FPU emulation broken in 2.6.28-rc8 ?

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Date:	Thu, 18 Dec 2008 00:33:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Rogier Wolff <R.E.Wolff@...Wizard.nl>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: FPU emulation broken in 2.6.28-rc8 ?

On Wed, Dec 17, 2008 at 11:52:21PM +0100, Rogier Wolff wrote:
> On Wed, Dec 17, 2008 at 11:45:39PM +0100, Andi Kleen wrote:
> > Rogier Wolff <R.E.Wolff@...Wizard.nl> writes:
> > >> 
> > >> I'm trying to set up a thin client, which runs on a geode, which
> > >> apparently doesn't have a FPU.... (/proc/cpuinfo mentions the flag 
> > >> "fpu", what does THAT mean?)
> > 
> > Geodes all have FPUs to my knowledge.
> > The only FPU less x87s are 386s and special 486s (and a few emulators)
> > 
> > If the FPU doesn't work on the Geode something else must be broken
> > (or your CPU is not really a Geode)
> 
> Although the /proc/cpuinfo file shows the FPU flag, the kernel stops
> with "no fpu found, and math emulation not present" if I disable
> FP emulation.... 

As I said then the problem is likely with the FPU check.

That said I don't doubt that FPU emulation might have broken
again (that is because hardly anyone uses it), just that fixing
it is not the real fix for your problem.

-Andi
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