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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Rupert Eibauer <rupert@ces.ch>
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Date: Sun, 23 Oct 2005 19:55:31 +1000
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Subject: Re: [PATCH][RFT] Extended BAT features, take 2
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On Sun, 2005-10-23 at 11:36 +0200, Rupert Eibauer wrote:
> On Sunday 23 October 2005 02:39, Paul Mackerras wrote:
> > Rupert Eibauer writes:
> > 
> > > What this patch actually does:
> > > - Make CONFIG_PHYS_64BIT selectable for the 6xx family
> > 
> > Why?  What does this gain us?  
> 
> I have I/O resources there which are not reachable in 32 bit mode.
> 
> > We still can't use RAM above the 4GB point AFAICS.
> 
> Does this mean the page tables do not support 63 bit?

Not with the current code. At least not for those CPUs.

Ben.