ARM-PXA toolchain

[Yann E. MORIN]

Mircea, All,

On Sunday 06 November 2011 17:28:19 Mircea Gherzan wrote:
> I am trying to build a Xscale/PXA linux-gnueabi toolchain by setting 
> CT_ARCH_ARCH to "iwmmxt" and CT_ARCH_CPU to "xscale".
> 
> When I run a trivial binary (compiled with this toolchain) in QEMU via
> 	qemu-arm -g 1234 -cpu pxa270 -L $PATH_TO_SYSROOT ./test

AFAIK, pxa2xx do not have iwmmxt. iwmmxt is present only on pxa3xx and
above.

> I get a SIGILL because of a VSTM instruction which is only available on 
> VFPv2/3-enabled cores.
> 	Program received signal SIGILL, Illegal instruction.
> 	0x40818f24 in ?? ()
> 	(gdb) disp/i $pc
> 	1: x/i $pc
> 	=> 0x40818f24:  vstmia  r12!, {d8-d15}

Looks like you are building with hardware floating point, and your
kernel does not have FP emulation.

> AFAIK, PXA chips have iwMMXt but no VFP. Since my test binary is just a 
> main() with a "return 0", the problem should be in the ld-linux loader.
> 
> How should I configure ct-ng for a proper toolchain for PXA (i.e. 
> without any VFP instructions in the libraries/loader)?

The bundled sample arm-unknown-linux-uclibcgnueabi is configured for
pxa25 (and it worked great on my pxa255 at the time I needed it):

  ct-ng arm-unknown-linux-uclibcgnueabi
  ct-ng build

Here are the related configuration items:
  CT_ARCH_ARCH="armv5te"
  CT_ARCH_CPU="xscale"
  CT_ARCH_TUNE="xscale"
  CT_ARCH_FPU=""
  CT_ARCH_FLOAT_SW=y

Regards,
Yann E. MORIN.

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