Re: Got FPU related warning on Intel Quark during boot

From: Bryan O'Donoghue
Date: Thu Mar 10 2016 - 12:15:30 EST


On Thu, 2016-03-10 at 17:49 +0100, Borislav Petkov wrote:
> On Thu, Mar 10, 2016 at 03:45:21PM +0000, Bryan O'Donoghue wrote:
> > It works but user-space FPU is broken; something's wrong with the
> > initial state of the FPU regs - it looks as though they aren't
> > being
> > properly initialized and FPU context in the signal handler is wrong
> > too.
>
> What does your test prog say when you boot linux-next with
> "eagerfpu=off" and *without* my fix?
>

root@galileo:~# ./fpu
f is 10.000000 g is 10.100000
Double value is 0.000000
Double value is 0.100000
Double value is 0.200000
^Chandler value of variable is 0.300000
Double value is 0.300000
Double value is 0.400000
^Z
[1]+ Stopped ./fpu
root@galileo:~#