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Date: Wed, 19 Mar 2008 08:52:54 +1100
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH v2] Force 4K pages for IO addresses.
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From: tony@bakeyournoodle.com (Tony Breeds)
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
	Jan-Bernd Themann <themann@de.ibm.com>,
	LinuxPPC-dev <linuxppc-dev@ozlabs.org>,
	Nathan Lynch <ntl@pobox.com>, Olof Johansson <olof@lixom.net>,
	Paul Mackerras <paulus@samba.org>
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On Wed, Mar 19, 2008 at 07:31:25AM +1100, Benjamin Herrenschmidt wrote:
> On Tue, 2008-03-18 at 09:45 -0500, Nathan Lynch wrote:
> > The ibm,drc-names property of the root node should have "HEA" strings
> > in it on systems where EHEA can potentially be present.
> 
> Ah good, I didn't know. That will force us to stick an ugly wart
> somewhere to test it though, maybe we can just force mmu_ci_restrictions
> to 1 ? Paul what do you think ?

That's not enough, mmu_io_psize also needs to be 4K.  I'll poke at doing
something platform specific today.

Yours Tony

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