[U-Boot] Relocation issue - need help!

[Marek Vasut]

On Wednesday, September 30, 2015 at 08:24:10 PM, Andy Fleming wrote:

Hi!

> On Thu, Oct 23, 2014 at 8:10 AM, Wolfgang Denk <wd at denx.de> wrote:
> > Dear Joakim, dear Dirk,
> > 
> > In message <OF14C3D470.864842B6-ONC1257D7A.002471AC-
C1257D7A.0024DEC4 at transmode.se> you wrote:
> >> Ouch, that was a nasty surprise.
> > 
> > Indeed.
> > 
> >> > In my original mail I referenced this potential solution, at least it
> >> > worked for me:
> >> > https://gcc.gnu.org/ml/gcc-help/2014-02/msg00054.html
> >> 
> >> That looks like the correct fix but I presume both .data.rel.ro and
> >> data.rel.ro.local should be added?
> > 
> > I can confirm:
> > 
> > 1) The problem was observed with gcc 4.8.1 [as in Yocto 1.5.x / ELDK
> > 
> >    5.5.x].
> > 
> > 2) Switching back to gcc 4.7.2 [as in Yocto 1.4 / ELDK 5.4] makes the
> > 
> >    problem go away.
> > 
> > 3) Switching forward to gcc 4.9.1 [as in Yocto 1.7 / ELDK 5.7] makes
> > 
> >    the problem go away.
> > 
> > 4) For the problemativ 4.8.x versions of GCC, the following patch
> > 
> >    apparently solves the problem for my (MPC5200 based) board - guess
> >    this would have to be applied to all .lds files...
> > 
> > diff --git a/arch/powerpc/cpu/mpc5xxx/u-boot.lds
> > b/arch/powerpc/cpu/mpc5xxx/u-boot.lds index cd9e23f..82c86d7 100644
> > --- a/arch/powerpc/cpu/mpc5xxx/u-boot.lds
> > +++ b/arch/powerpc/cpu/mpc5xxx/u-boot.lds
> > @@ -27,6 +27,8 @@ SECTIONS
> > 
> >    {
> >    
> >      _GOT2_TABLE_ = .;
> >      KEEP(*(.got2))
> > 
> > +    KEEP(*(.data.rel.ro))
> > +    KEEP(*(.data.rel.ro.local))
> > 
> >      KEEP(*(.got))
> >      PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
> >      _FIXUP_TABLE_ = .;
> > 
> > Given that GCC 4.9.1 apparently solves this issue I wonder which
> > approach we should take?
> > 
> > Should we blacklist GCC 4.8.x (and 4.9.0) like the kernel folks are
> > doing [1] ?
> > 
> > [1] https://lkml.org/lkml/2014/10/10/272
> 
> Was there a resolution to this thread? I just spent a bunch of time
> trying to figure out why u-boot was crashing, and eventually
> determined that switching from 4.9.0 to 4.6.3 solved the problem.
> Should I submit a patch to do what was suggested above? Or add the
> "blacklist" patch? If so, it should be noted that 4.9.0 is the current
> default installed when you ask buildman to install a powerpc cross
> compiler...

Blacklist patch please, thank you!

Best regards,
Marek Vasut