linux-kernel - Re: [RFC PATCH 02/10] MIPS: Octeon: Add device tree source files.

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Message-ID: <20110223143028.GA11832@linux-mips.org>
Date:	Wed, 23 Feb 2011 15:30:28 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	David Gibson <david@...son.dropbear.id.au>,
	David Daney <ddaney@...iumnetworks.com>,
	linux-mips@...ux-mips.org, devicetree-discuss@...ts.ozlabs.org,
	grant.likely@...retlab.ca, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/10] MIPS: Octeon: Add device tree source files.

On Wed, Feb 23, 2011 at 11:07:59AM +1100, David Gibson wrote:

> Uh.. where are the CPUs?

CPUs are probed the old style way on MIPS.  There is a large number of
varieties of CPUs - things like cache size, cache line size, architectural
extension and many small details of behaviour differ.  If we'd fully
honor DT CPU configuration information a kernel would need to have fairly
full blown generic CPU support for anything under the sun.  But there
already is a scheme that allows platform support code to select permanet
enablement, disablement or runtime probe for every CPU feature under the
sun for significant code savings and performance gain.

  Ralf
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