linux-kernel - Re: [PATCH 2/2] arm: boot: store ATAG structure into DT atags field

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Date:	Fri, 15 May 2015 22:21:13 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Sebastian Reichel <sre@...ian.org>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	linux-omap@...r.kernel.org,
	Andreas Färber <afaerber@...e.de>
Subject: Re: [PATCH 2/2] arm: boot: store ATAG structure into DT atags field

On Friday 15 May 2015 22:16:24 Pali Rohár wrote:
> On Friday 15 May 2015 22:12:41 Arnd Bergmann wrote:
> > On Friday 15 May 2015 21:50:07 Pali Rohár wrote:
> > >                 }
> > >         
> > >         }
> > > 
> > > +       /* include the terminating ATAG_NONE */
> > > +       atag_size = (char *)atag - (char *)atag_list +
> > > sizeof(struct tag_header); +       setprop(fdt, "/", "atags",
> > > atag_list, atag_size);
> > > +
> > > 
> > >         if (memcount) {
> > >         
> > >                 setprop(fdt, "/memory", "reg", mem_reg_property,
> > >                 
> > >                         4 * memcount * memsize);
> > 
> > The property should probably have a DT binding, and be named
> > "linux,atags".
> > 
> > It may also help to check if the "linux,atags" property already
> > exists and not create it otherwise. That way we can put it into the
> > n900 dts file and have it updated by the compat code, but not expose
> > the atags on other platforms unless they opt in.
> > 
> >       Arnd
> 
> Maybe what would help: Is there a way to tell decompressor/kernel to not 
> touch atag memory and then after kernel/board-code starts it save copy 
> of atags? I think it is not possible right now, but correct me if I'm 
> wrong...
> 

I don't think that is possible without an incompatible change to the
boot protocol.

	Arnd
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