How to build cross toolchain for ARM with iWMMXt/NPTL/EABI?

[Daniel Kabs]

Hi,

using crosstool I've built a cross toolchain for Intel PXA270 (Xscale 
ARM core). The toolchain was configured for hard-float (FPA) and NWFPE 
was enabled in the kernel. The host was i386, a PC.

Now I want to use iWMMXt opcodes in programs. As I understand, iWMMXt 
and hard-float (FPA) instructions use the same opcodes, so I need a 
cross toolchain with soft float support. I plan to rebuild userland 
completely with that toolchain.

I read that nowadays the way to go is to build for the ARM EABI and the 
target is "arm-iwmmxt-linux-gnueabi".

How do I build a cross toolchain for this target? Crosstool doesn't come 
with support for the above target. It supports only the following arm 
related targets:
arm-iwmmxt.dat:     TARGET=arm-iwmmxt-linux-gnu
arm-softfloat.dat:  TARGET=arm-softfloat-linux-gnu
arm-xscale.dat:2:   TARGET=arm-xscale-linux-gnu

None of them seems appropriate (crosstools' arm-iwmmxt and
arm-softloat targets do not support gcc-4.x, and arm-xscale says nothing
about soft floats, EABI or iwmmxt support).

People on this list are talking about arm-iwmmxt-linux-gnueabi in the 
context of patched versions of crosstool but I failed to find enough 
information to put it to good use. What I found was that there seems to 
be a separate development branch for crosstool: crosstool-ng. Still the 
"new" version of crosstool does not support that target. I am confused.

What is the current recommendation on how to build a cross toolchain 
configured for arm-iwmmxt-linux-gnueabi, especially with crosstool? Is 
there a repository for crosstool patches?

Thanks a lot.

Cheers
Daniel


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