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

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Date:	Mon, 21 Apr 2008 21:25:17 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Mitch Bradley <wmb@...mworks.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"H. Peter Anvin" <hpa@...or.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 15:46 -0400, Andres Salomon wrote:
> Well, no, it wasn't already working; that's the reason this whole
> thread started.  It was crashing someone's machine.  That's why the OFW
> interface, as imperfect as it is, is an _improvement_.

You're proposing a new interface between bootloader and kernel as a
temporary hack just to work around that until we fix it properly?

That seems like overkill to me. I'd just go for is_geode() as you
suggested, and maybe PCI configuration tricks to detect the lack of VSA
so we can be _fairly_ sure it's OLPC before we poke at it?

Or why not try '!page_is_ram(0xffffffc0 >> PAGE_SHIFT)' if it's just to
avoid that particular warning? :)

-- 
dwmw2

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