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

[Benjamin Herrenschmidt]

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 ;-)

Cheers,
Ben.