On Wed, Jun 16, 2021 at 4:43 AM Nick Kossifidis [off-list ref] wrote:

Στις 2021-06-16 10:56, Geert Uytterhoeven έγραψε:

quoted

I can't comment on the duplication on arm64, but to me, /chosen
sounds like the natural place for both "linux,elfcorehdr" and
"linux,usable-memory-range".  First rule of DT is "DT describes
hardware, not software policy", with /chosen describing some software
configuration.

We already have "linux,usable-memory" on /memory node:
https://elixir.bootlin.com/linux/v5.13-rc6/source/drivers/of/fdt.c#L1011
and it makes perfect sense to be there since it overrides /memory's reg
property.

Why define another binding for the same thing on /chosen ?

Go look at the thread adding "linux,usable-memory-range". There were
only 35 versions of it[1]. I wasn't happy with a 2nd way either, but
as I've mentioned before we don't always have /memory node.

Rob

[1] https://lore.kernel.org/linux-arm-kernel/20170403022606.12609-1-takahiro.akashi@linaro.org/ (local)

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