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On the Allwinner A80 SoC the BROM supports hotplugging the primary core (cpu0) by checking two 32bit values at a specific location within the secure SRAM block. This region needs to be reserved and accessible to the SMP code. Document its usage. Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Chen-Yu Tsai <wens@csie.org>