Re: Xilinx Virtex4 FX PPC

On Mon, 2007-08-20 at 11:35 -0500, Josh Boyer wrote:

On Mon, 20 Aug 2007 10:00:54 -0600
Robert Woodworth [off-list ref] wrote:

quoted

Problem 2:  Build my own rootfs.
If I try to build my own programs (busybox and bash at this point) with
shared libc using the same glibc from my toolchain, I get an "Illegal
instruction" error.  Is my glibc not compatible with my Xilinx PPC 405??


If I try to build a rootfs with debian ppc packages I have the same
"Illegal instruction" error.



Question 1:
Do I need a special glibc for the Xilinx PPC 405????  
Does a normal PPC glibc have more "advanced" instructions compiled in
that will not work on a Xilinx PPC 405??

Make sure you're building glibc with soft-fp, or make sure you have
CONFIG_MATH_EMULATION enabled in your kernel.  The PPC 405 doesn't have
an FPU.

josh

CONFIG_MATH_EMULATION fixed it!!



What are the opinions out there? 
Kernel fp or glibc soft-fp??

I don't have a need for floating point in my final application anyway.