[OpenBIOS] [PATCH] ppc: use rfid when running under a CPU from the 970 family.

[Cédric Le Goater]

On 06/21/2016 04:18 AM, Benjamin Herrenschmidt wrote:
> On Mon, 2016-06-20 at 17:42 +0200, Cédric Le Goater wrote:
>> flushing the cache does not seem necessary. I suppose because we did not go 
>> through this range of instructions yet, I am not sure how qemu handle 
>> the cache instructions. Need to check.
>>
>> Thanks, I will bake a patch for it. 
> 
> The cache might prefetch, you need to do the dcbf/sync/icbi/isync dance
> (it's not needed on modern processors but is on older ones so better
> safe than sorry in openbios).
> 
> You didn't see a problem also because qemu doesn't care ;-)

I see. I will add a flush_icache_range(). 

Thanks,

C.