Messages in this thread | | | From | Chen-Yu Tsai <> | Date | Wed, 24 Sep 2014 19:53:33 +0800 | Subject | Re: [linux-sunxi] Re: [PATCH 3/6] ARM: dts: sunxi: Add Allwinner A80 dtsi |
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On Wed, Sep 24, 2014 at 3:18 PM, Gregory CLEMENT <gregory.clement@free-electrons.com> wrote: > 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
Thanks for the tip. Before I send v2, I do have a question. I'm using
ranges = <0 0 0 0x20000000>;
in the clocks and soc node to avoid having to use 64bit values for all addresses and sizes. Would this be undesirable, even bad practice maybe?
http://linux-sunxi.org/A80/Memory_map is a document I pieced together from Allwinner's SDK header files. AFAIK only the memory goes above the 4GB limit. All peripherals are under 512 MB, 256MB even.
Thanks ChenYu
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