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Date:	Fri, 21 Mar 2014 10:44:23 +0100
From:	Ben Dooks <>
To:	Jisheng Zhang <>
CC:	Sebastian Hesselbarth <>,
	Mark Rutland <>,
	"" <>,
	Russell King <>,
	Pawel Moll <>,
	Ian Campbell <>,
	Antoine Tenart <>,
	"" <>,
	Rob Herring <>,
	Alexandre Belloni <>,
	Kumar Gala <>,
Subject: Re: [PATCH 0/2] ARM: berlin: SMP support

On 21/03/14 04:14, Jisheng Zhang wrote:
> On Thu, 20 Mar 2014 13:39:44 -0700
> Sebastian Hesselbarth <> 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
Senior Engineer				Codethink - Providing Genius
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