[PATCH] powerpc/85xx: enable the math emulation for the corenet64_smp_defconfig

[Scott Wood]

On 07/09/2013 08:49:52 PM, Kevin Hao wrote:
> I got the following error on my t4240qds board.
>   ntpd[2713]: unhandled signal 4 at 0fd5b448 nip 0fd5b448 lr 0fd5b424  
> code 30001
> 
> The root cause is that the float point instruction 'fsqrt' is used.
> But this instruction is not implemented on e6500 core. Even this
> does seem a gcc bug, I would like to enable the math emulation
> in the kernel to workaround this kind of issue.

I'll apply this, but we should add PPC_WARN_EMULATED to math-emu so  
that people know when their toolchain is emitting things that require  
emulation.

It'd also be nice if we had an option to only include the portions of  
math-emu that are known to be missing in some CPUs (excluding CPUs that  
are missing the entire FPU, of course).  Besides its effect on kernel  
image size, in my experience math-emu adds a non-trivial amount of time  
to a kernel build.

-Scott