On Wed, Sep 24, 2014 at 3:18 PM, Gregory CLEMENT
[off-list ref] wrote:

Hi Chen-Yu,

quoted

quoted

quoted

+
+     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