linux-kernel - Re: [RFC 1/5] of: Add support for ePAPR "stdout-path" property

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Message-Id: <20140329003050.C5A31C434EC@trevor.secretlab.ca>
Date:	Fri, 28 Mar 2014 17:30:50 -0700
From:	Grant Likely <grant.likely@...aro.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	devicetree@...r.kernel.org, christoffer.dall@...aro.org,
	linux-kernel@...r.kernel.org, olof@...om.net,
	rob.herring@...aro.org
Subject: Re: [RFC 1/5] of: Add support for ePAPR "stdout-path" property

On Sat, 29 Mar 2014 08:33:16 +1100, Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> On Fri, 2014-03-28 at 09:08 -0700, Grant Likely wrote:
> > ePAPR 1.1 defines the "stdout-path" property for specifying the console
> > device, but Linux currently only handles the older "linux,stdout-path"
> > property. This patch adds parsing for the new property name.
> 
> Generally a good idea I think, but of course I need time to review and
> test ... :-)
> 
> One thing that's been annoying me lately with the existing code which
> you don't address is ... in a few cases my consoles are usable *VERY*
> early. For example PAPR hvc and OPAL hvc can be used before we even turn
> the MMU on on powerpc (and thus before we unflatten the device-tree).
> 
> It would be nice to be able to have the console going that early,
> unfortunately that would imply using the flat device-tree for the
> parsing / matching of the stdout-path in those drivers.

I think we can get that done. Rob's series goes a long way to that, and
I don't think the flattree parsing will be all that complex.

g.

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