can't boot mpc5200, powerpc: Enable AT_BASE_PLATFORM aux vector

[Jon Smirl]

On 7/25/08, Nathan Lynch <ntl at pobox.com> wrote:
> Commit 9115d13453dee22473a1e8cacc90a8d64a9c4bc9 ("powerpc: Enable
>  AT_BASE_PLATFORM aux vector") broke boot on 32-bit powerpc systems; we
>  have to use PTRRELOC to initialize powerpc_base_platform this early in
>  boot.
>
>  Bug reported by Jon Smirl.
>
>
>  Signed-off-by: Nathan Lynch <ntl at pobox.com>
>
> ---
>
> Benjamin Herrenschmidt wrote:
>  > if (RELOC(powerpc_base_platform))
>  >       RELOC(powerpc_base_platform) = t->platform;
>  >
>  > try that.
>
>
> Maybe this?  (RELOC isn't defined in any header AFAICT).
>
>   arch/powerpc/kernel/cputable.c |    4 ++--
>   1 files changed, 2 insertions(+), 2 deletions(-)
>
>
>  diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
>
> index 25a052c..25c273c 100644
>
> --- a/arch/powerpc/kernel/cputable.c
>  +++ b/arch/powerpc/kernel/cputable.c
>
> @@ -1660,8 +1660,8 @@ struct cpu_spec * __init identify_cpu(unsigned long offset, unsigned int pvr)
>
>                          * Set the base platform string once; assumes
>                          * we're called with real pvr first.
>                          */
>  -                       if (powerpc_base_platform == NULL)
>  -                               powerpc_base_platform = t->platform;
>
> +                       if (*PTRRELOC(&powerpc_base_platform) == NULL)
>  +                               *PTRRELOC(&powerpc_base_platform) = t->platform;

This works too.

>
>
>   #if defined(CONFIG_PPC64) || defined(CONFIG_BOOKE)
>                         /* ppc64 and booke expect identify_cpu to also call
>
> --
>  1.5.6.2
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-- 
Jon Smirl
jonsmirl at gmail.com