On Wed, Sep 24, 2014 at 3:18 PM, Gregory CLEMENT
<gregory.clement@xxxxxxxxxxxxxxxxxx> 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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