From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gregory CLEMENT <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Subject: Re: Re: [PATCH 3/6] ARM: dts: sunxi: Add Allwinner A80 dtsi
Date: Wed, 24 Sep 2014 09:18:16 +0200
Message-ID: <54227038.2020805@free-electrons.com>
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To: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Cc: linux-sunxi <linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, Ian Campbell <ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>, Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>, linux-arm-kernel <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-kernel <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Shuge <shuge-0TFLnhJekD6UEPyfVivIlAC/G2K4zDHf@public.gmane.org>, Meng Zhang <kevin-0TFLnhJekD6UEPyfVivIlAC/G2K4zDHf@public.gmane.org>, yhf-HcjymKqD97rQT0dZR+AlfA@public.gmane.org, ctl-HcjymKqD97rQT0dZR+AlfA@public.gmane.org
List-Id: devicetree@vger.kernel.org

Hi Chen-Yu,


>>> +
>>> +     memory {
>>> +             reg = <0x20000000 0x40000000>;
>>
>> Usually, what we put there was the maximum amount of RAM that can be
>> handled by the SoC. I think that it can go above 1GB
> 
> With LPAE, it can handle 8GB. But the DT won't take 64bit values.
> I'm not sure how to get it in. I'll look around for examples.

You can have a look on what we did for Armada XP:

arch/arm/boot/dts/armada-370-xp.dtsi
arch/arm/boot/dts/armada-xp.dtsi
arch/arm/boot/dts/armada-xp-gp.dts

I created a skeleton64.dtsi for this case

Gregory


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com