linux-kernel - Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

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Message-ID: <20151126203930.GW2517@atomide.com>
Date:	Thu, 26 Nov 2015 12:39:30 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Frank Rowand <frowand.list@...il.com>,
	Arnd Bergmann <arnd@...db.de>, Pavel Machek <pavel@....cz>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Laura Abbott <lauraa@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robherring2@...il.com>,
	Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Andreas Färber <afaerber@...e.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT
 "/chosen/linux,atags" entry

* Pali Rohár <pali.rohar@...il.com> [151126 01:08]:
> On Wednesday 25 November 2015 20:19:21 Frank Rowand wrote:
> > > Or populate /proc/atags only for the ones that need it from machine
> > > specific init_early?
> > 
> > This is circling back to the first comment from Russell King where
> > he suggested a legacy file for the N900 which calls save_atags():
> > 
> >     Are the ATAGs at a fixed address on the N900?  Can that be handled in
> >     some kind of legacy file for the N900 which calls save_atags() on it, so
> >     we don't end up introducing yet more stuff that we have to maintain into
> >     the distant future?  If not, what about copying a known working atag
> >     structure into a legacy file for the N900?
> > 
> > It seems to me that patches 1, 2, 4, and 5 could be replaced by this
> > approach.
> 
> Hi Frank, in this case I will ask my question again: It is possible to
> read atags from that legacy file. And if yes how? I was not thinking
> about this approach because somebody in past wrote that this is not
> possible...

Just to explore options.. How about make a minimal device driver that
just loads the atags blob from /lib/firmware and then shows it in
/proc/atags? Of course some checking on the atags should be done by
the driver..

That would work as long as the kernel no longer needs it.

Regards,

Tony
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