[U-Boot-Users] MPC8xx boards broken by commit some weeks ago

[Stefan Roese]

Hi Martin,

On Monday 16 July 2007, Martin Krause wrote:
> support for - at least some - MPC8xx boards seems broken. To prepare some
> new patches, I build a current U-Boot (top of tree) for our TQM885D board.
> With this U-Boot, some time after relocation to RAM the board hangs:

<snip>

> I tracked the problem down (git bisect is great!) to the commit "ppc4xx:
> Clean up 440 exceptions handling" from Stefan Roese on 15 Jun 2007
> (efa35cf12d914d4caba942acd5a6c45f217de302).
>
> More precisely to the following patch:
>
> --- a/include/ppc_asm.tmpl
> +++ b/include/ppc_asm.tmpl
> @@ -217,7 +217,7 @@
>   * We assume sprg3 has the physical address of the current
>   * task's thread_struct.
>   */
> -#define EXCEPTION_PROLOG       \
> +#define EXCEPTION_PROLOG(reg1, reg2)   \
>         mtspr   SPRG0,r20;      \
>         mtspr   SPRG1,r21;      \
>         mfcr    r20;            \
> @@ -235,8 +235,10 @@
>         stw     r22,_CTR(r21);  \
>         mfspr   r20,XER;        \
>         stw     r20,_XER(r21);  \
> -       mfspr   r22,SRR0;       \
> -       mfspr   r23,SRR1;       \
> +       mfspr   r20,DEAR;       \  <--
> +       stw     r20,_DAR(r21);  \  <--

We are currently working on a fix for this. Sorry for the inconvenience.

Best regards,
Stefan

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