Re: [PATCH 0/2] ARM: berlin: SMP support

[Ben Dooks]

On 21/03/14 04:14, Jisheng Zhang wrote:
> On Thu, 20 Mar 2014 13:39:44 -0700
> Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx> wrote:
>
> > This is a small patch set for SMP support on Marvell Berlin BG2
> > and recently provided BG2Q. Nothing spectacular, as it basically
> > copies SMP holding pen mechanism from mach-prima2 and plat-versatile
> > with minor Berlin specific code for SCU and general purpose registers
> > used by secondary CPUs to get their boot address.
> >
> > There was some IRC discussion with Alexandre about using
> > scu_get_base() instead of a DT node. Although BG2Q is true A9
> > and provides SCU base; BG2 with PJ4b does not and I decided to
> > depend on a DT node for SCU in both cases, which is fine I guess.
> >
> > I tested this on BG2, and BG2CD (which is UP). I expect the
> > Free-Electrons guys to test on BG2Q.
>
> Although BG2Q and future SoCs will go through PSCI code path finally. But
> currently, it's OK to use the pen mechanism.
>
> So for both of these two patches,

Can you not just avoid starting CPUs until the kernel asks
them to be booted?

--
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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