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

From: Ben Dooks
Date: Fri Mar 21 2014 - 05:44:48 EST

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
Senior Engineer Codethink - Providing Genius
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