[U-Boot] PowerPC -mrelocatable

[Joakim Tjernlund]

>
> Peter Tyser wrote:
> > On Thu, 2009-08-27 at 10:38 -0500, Scott Wood wrote:
> >> Someone tried to get proper relocation working a while ago, but ran into
> >> toolchain bugs.  Maybe current toolchains are better...
> >
> > X-ES's board's in U-Boot fully relocate to SDRAM with the
> > CONFIG_RELOC_FIXUP_WORKS define and -mrelocatable compiler flag.  This
> > feature has worked with gcc-4.3.1/binutils-2.18.90 and
> > gcc-4.2.2/binutils-2.17.50.
> >
> > Does anyone have a specific example of a toolchain that doesn't work?
> > It'd be great to get the issue figured out and get rid of all those
> > gd->reloc_off references that currently litter the code...

Yes, and not just nullify reloc_off. It should be removed when compiling
with -mrelocatable to cut size down too.

>
> According to these e-mails:
> http://lists.denx.de/pipermail/u-boot/2007-October/025937.html
> http://lists.denx.de/pipermail/u-boot/2007-October/025941.html
>
> it worked in (at least some) 4.0, but not (at least some) 3.x or 4.1.
>
> If we're now at the point where current GCC works, and has for several
> releases, we should probably consider revisiting those patches.

gcc 3.4.6 and ld 2.16.1 worked fine on ppc last time I tried it.