linux-kernel - Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

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Date:	Mon, 21 Apr 2008 19:54:04 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andres Salomon <dilinger@...ued.net>,
	Mitch Bradley <wmb@...mworks.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joseph Fannin <jfannin@...il.com>,
	linux-kernel@...r.kernel.org, jordan.crouse@....com
Subject: Re: [PATCH 1/2] OLPC: Add support for calling into Open Firmware

On Mon, 2008-04-21 at 12:57 -0400, H. Peter Anvin wrote:
> David Woodhouse wrote:
> > 
> >> However, until we clean up the promfs stuff, there's no chance of getting
> >> an OFW device tree upstream.
> > 
> > I see no reason why we shouldn't be able to create a 'flattened'
> > device-tree during early boot, like the PowerPC kernel does. And use it
> > thereafter, having quiesced OpenFirmware. Haven't we already been
> > working on unifying this between SPARC and PowerPC kernels?
> > 
> > I definitely don't think we need to play these tricks to keep
> > OpenFirmware resident while the kernel is running. Take a look at your
> > second patch -- it's _all_ just lookups in the device-tree, and you're
> > inventing a new way to do it instead of using the existing one.
> > 
> 
> If so, would this apply to OLPC as well?

Yes. The 'second patch' to which I refer is the one which makes OLPC
platform code use the calls in OpenFirmware... all of them gratuitous.

-- 
dwmw2

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