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From: Peter Maydell <peter.maydell@linaro.org>
To: "long.wanglong" <long.wanglong@huawei.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Russell King <linux@arm.linux.org.uk>,
	nico@linaro.org, Victor Kamensky <victor.kamensky@linaro.org>,
	lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"ben.dooks@codethink.co.uk" <ben.dooks@codethink.co.uk>,
	santosh.shilimkar@ti.com,
	Christopher Covington <cov@codeaurora.org>,
	arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [SMP BUG?] the return value of is_smp() is bug?
Date: Thu, 4 Sep 2014 09:33:43 +0100	[thread overview]
Message-ID: <CAFEAcA82zX-yodXYB+4vVrjq7tVe=wV4v3iCQ7O1a1HLFX_B1w@mail.gmail.com> (raw)
In-Reply-To: <5407BCAE.7030606@huawei.com>

On 4 September 2014 02:13, long.wanglong <long.wanglong@huawei.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

WARNING: multiple messages have this Message-ID (diff)
From: peter.maydell@linaro.org (Peter Maydell)
To: linux-arm-kernel@lists.infradead.org
Subject: [SMP BUG?] the return value of is_smp() is bug?
Date: Thu, 4 Sep 2014 09:33:43 +0100	[thread overview]
Message-ID: <CAFEAcA82zX-yodXYB+4vVrjq7tVe=wV4v3iCQ7O1a1HLFX_B1w@mail.gmail.com> (raw)
In-Reply-To: <5407BCAE.7030606@huawei.com>

On 4 September 2014 02:13, long.wanglong <long.wanglong@huawei.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

  reply	other threads:[~2014-09-04  8:34 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-01  5:49 [SMP BUG?] the return value of is_smp() is bug? Wang Long
2014-09-01  5:49 ` Wang Long
2014-09-01 10:00 ` long.wanglong
2014-09-01 10:00   ` long.wanglong
2014-09-01 10:26   ` Arnd Bergmann
2014-09-01 10:26     ` Arnd Bergmann
2014-09-04  1:13     ` long.wanglong
2014-09-04  1:13       ` long.wanglong
2014-09-04  8:33       ` Peter Maydell [this message]
2014-09-04  8:33         ` Peter Maydell
2014-09-01 11:15 Wang Long
2014-09-01 11:15 ` Wang Long
2014-09-02  4:40 ` Leon Yu
2014-09-01 11:35 Wang Long
2014-09-01 11:35 ` Wang Long
2014-09-01  8:49 ` Arnd Bergmann
2014-09-01  8:49   ` Arnd Bergmann
2014-09-01 10:19 ` Russell King - ARM Linux
2014-09-01 10:19   ` Russell King - ARM Linux
2014-09-04  1:01   ` long.wanglong
2014-09-04  1:01     ` long.wanglong

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