Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

From: Mark Rutland
Date: Fri Mar 13 2015 - 06:35:32 EST

> > Which of spin-table/psci are you planning on using for SMP support, and
> > when would that be likely to appear?
> We have a qcom specific SMP enablement method for this device. This
> was one of our first devices so it utilized as much from arm 32-bit as
> possible.

Implementation specific enable methods are something we really don't
want to see for arm64. If PSCI is out of the question then a spin-table
shim in your bootloader shouldn't be too hard to implement.

> > Which exception level do CPUs enter the kernel? Even without a
> > virt-capable GIC booting at EL2 is less work for the FW and gives the
> > kernel a better chance of fixing things up (e.g. CNTVOFF).
> I think the enter in EL1.

That's unfortunate, but so long as they are consistent, it's not the end
of the world.

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