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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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