FP and signal 4

Josh Boyer jwboyer at linux.vnet.ibm.com
Thu Jun 5 12:31:23 EST 2008

On Wed, 4 Jun 2008 14:43:48 +0000
- Reyneke <reynekejunk at hotmail.com> wrote:

> 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. 

I've not seen that.

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

440EPx should get the FPU enabled at runtime.  We use a virtual PVR to
do the APU/FPU init.  What does your cpu node look like in your DTS
file for your board?


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