FP and signal 4

- Reyneke reynekejunk at hotmail.com
Thu Jun 5 00:43:48 EST 2008

Hi all,

Has anyone come across any floating point issues in the new powerpc kernel branch with regards to 44x? I'm seeing programs (i.e. init/busybox) generating signal 4 (illegal instruction) exceptions. If I compile a 2.6.25 kernel with the CONFIG_MATH_EMULATION option set, then everything works OK. 

Using a 440EPx (has a onchip FPU) with the ELDK 4.0 ppc_4xxFP toolchain for all apps/kernel/fs. 

Kind of follows on from this thread: http://ozlabs.org/pipermail/linuxppc-embedded/2007-June/027363.html



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