Re: [Qemu-devel] [PATCH] PPC: mac newworld: fix cpu NIP reset value

["Andreas Färber" <afaerber@suse.de>]

Am 04.04.2013 18:47, schrieb Alexander Graf:
> On -M mac99, we can run 970 CPUs. However, these CPUs define the initial
> instruction pointer they start execution at as part of their bootup protocol,
> so effectively it's up to the board to decide where they start.
> 
> This went unnoticed, because they used to boot at the same location our flash
> was mapped to, but due to the recent reset changes our 970 CPUs want to reset
> to 0x100 now, which is always a 0 instruction.
> 
> Set the initial IP to something reasonable for -M mac99.
> 
> Signed-off-by: Alexander Graf <agraf@suse.de>
> ---
>  hw/ppc/mac_newworld.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
> index a08a6b2..ca7d98f 100644
> --- a/hw/ppc/mac_newworld.c
> +++ b/hw/ppc/mac_newworld.c
> @@ -126,6 +126,8 @@ static void ppc_core99_reset(void *opaque)
>      PowerPCCPU *cpu = opaque;
>  
>      cpu_reset(CPU(cpu));
> +    /* 970 CPUs want to get their initial IP as part of their boot protocol */
> +    cpu->env.nip = PROM_ADDR + 0x100;
>  }
>  
>  /* PowerPC Mac99 hardware initialisation */

That is lacking a restriction to 970... :) There's probably some -cpu to
make it start from -4 instead, no?

Andreas

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