[U-Boot] [PATCH] powerpc: do not fixup NULL ptrs

[Schwarz,Andre]

All,



Wolfgang Denk <wd at denx.de> hat am 18. Oktober 2010 um 22:39 geschrieben:

> Dear Joakim Tjernlund,
>
> In message <1287049904-18917-1-git-send-email-Joakim.Tjernlund at transmode.se>
> you wrote:
> > The fixup routine must not fixup NULL pointers.
> > Problem can be seen by
> >  char *testfun(void) __attribute__((weak));
> >  char *(*myfun)(void) = testfun;
> >
> > Then add
> >   printf("myfun:%p, &myfun:%p\n", myfun, &myfun);
> > before relocation and after relocation.
> > myfun should be NULL in both cases but it is not.
> >
> > Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund at transmode.se>
> > ---
> >  arch/powerpc/cpu/74xx_7xx/start.S |    4 +++-
> >  arch/powerpc/cpu/mpc512x/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc5xx/start.S   |    4 +++-
> >  arch/powerpc/cpu/mpc5xxx/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc8220/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc824x/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc8260/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc83xx/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc85xx/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc86xx/start.S  |    4 +++-
> >  arch/powerpc/cpu/mpc8xx/start.S   |    4 +++-
> >  arch/powerpc/cpu/ppc4xx/start.S   |    4 +++-
> >  12 files changed, 36 insertions(+), 12 deletions(-)
>
> Applied, thanks. 
has anybody ever tested this ?
Although it looks obvious and correct this patch is somewhat intrusive and
breaks at least two of our (MPC83xx) boards.
 
I've asked Joakim already for some clarification :
 
http://lists.denx.de/pipermail/u-boot/2010-October/080121.html
 
Since I assume Wolfgang won't accept a board specific "add 4 nops after
_start"-patch I'd like to solve this without trial and error.
 
Of course digging into this is beyond my knowledge and any help would be
appreciated.
I simply can't think of being the only one having this issue...
 
I'm running U-Boot TOT with ELDK-4.2 toolchain.


Regards,
André

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