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

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Message-ID: <532C09F7.3010003@codethink.co.uk>
Date:	Fri, 21 Mar 2014 10:44:23 +0100
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Jisheng Zhang <jszhang@...vell.com>
CC:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
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 <sebastian.hesselbarth@...il.com> 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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