On Wed, Jul 10, 2013 at 04:40:03PM -0500, Scott Wood wrote: > 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.
Sure. > > 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. Sounds reasonable. I will give it a try. Thanks, Kevin > > -Scott
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