linux-kernel - Re: [SMP BUG?] the return value of is

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Message-ID: <CAFEAcA82zX-yodXYB+4vVrjq7tVe=wV4v3iCQ7O1a1HLFX_B1w@mail.gmail.com>
Date:	Thu, 4 Sep 2014 09:33:43 +0100
From:	Peter Maydell <peter.maydell@...aro.org>
To:	"long.wanglong" <long.wanglong@...wei.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>, nico@...aro.org,
	Victor Kamensky <victor.kamensky@...aro.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"ben.dooks@...ethink.co.uk" <ben.dooks@...ethink.co.uk>,
	santosh.shilimkar@...com,
	Christopher Covington <cov@...eaurora.org>,
	arm-mail-list <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [SMP BUG?] the return value of is_smp() is bug?

On 4 September 2014 02:13, long.wanglong <long.wanglong@...wei.com> wrote:
> When i revert the commit bc41b8724f24, the secondary core can boot.
> The problem is that qemu doesn't provide emulation of the SCU base
> address register. When reading the SCU base, qemu just return 0.

You need to upgrade your QEMU -- we improved the emulation
of all our Cortex-A9 boards to make sure they set valid values
for the base address register, in order to fix exactly this regression.
QEMU 2.0 or later should work.

(As an aside, I think the Aegis quirk test is pretty ugly:
"base address happens to be set to zero" is not exactly
a very reliable way to identify a particular SoC. However
in this case QEMU was emulating real h/w insufficiently
accurately, so we fixed it.)

thanks
-- PMM
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