From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Nicolas Pitre <nicolas.pitre-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Mark Rutland <Mark.Rutland-5wv7dgnIgG8@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Pawel Moll <Pawel.Moll-5wv7dgnIgG8@public.gmane.org>,
Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Marc Zyngier <Marc.Zyngier-5wv7dgnIgG8@public.gmane.org>,
Linus Walleij
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Will Deacon <Will.Deacon-5wv7dgnIgG8@public.gmane.org>,
Feng Kan <fkan-qTEPVZfXA3Y@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH v2] ARM: realview: basic device tree implementation
Date: Thu, 22 May 2014 20:26:19 +0200 [thread overview]
Message-ID: <5233065.1vXjHiDqN2@wuerfel> (raw)
In-Reply-To: <alpine.LFD.2.11.1405221406100.17310-fMhRO7WWcppj+hNMo8g0rg@public.gmane.org>
On Thursday 22 May 2014 14:09:52 Nicolas Pitre wrote:
> On Thu, 22 May 2014, Arnd Bergmann wrote:
>
> > On Thursday 22 May 2014 15:45:03 Catalin Marinas wrote:
> > > By making the DMA memory Strongly Ordered, we avoid the
> > > L220 write buffer. In addition to the above commit, we also had
> > > 2503a5ecd86c (ARM: 6201/1: RealView: Do not use outer_sync() on
> > > ARM11MPCore boards with L220).
> >
> > Ah, so this also stands in the way of multiplatform realview
>
> Isn't the real value of a multiplatform realview in the ability to use
> it with Qemu? Did Qemu go to the extreme of emulating all those cache
> issues?
The qemu developers have in the past always argued strongly that they
want to run the same kernel that runs on real hardware. Having a kernel
that runs only on the emulated version but not on actual hardware is
clearly against that goal, and we should use CONFIG_ARCH_VIRT for
that purpose.
Arnd
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next prev parent reply other threads:[~2014-05-22 18:26 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-08 22:08 [PATCH v2] ARM: realview: basic device tree implementation Linus Walleij
[not found] ` <1399586896-16906-1-git-send-email-linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2014-05-09 10:44 ` Arnd Bergmann
[not found] ` <201405091244.02066.arnd-r2nGTMty4D4@public.gmane.org>
2014-05-22 7:41 ` Linus Walleij
[not found] ` <CACRpkdb8c=k3Ky=TisNdzycc3owJsNSQmSTu03RR5E0QvE0KZA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-22 8:31 ` Arnd Bergmann
2014-05-22 13:04 ` Linus Walleij
[not found] ` <CACRpkdYE0Fb+HezqgDbVcqQmWwn7QL2+RWSRyAigv2qcMp2qFQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-22 13:38 ` Arnd Bergmann
2014-05-22 14:45 ` Catalin Marinas
[not found] ` <20140522144503.GA27931-5wv7dgnIgG8@public.gmane.org>
2014-05-22 15:49 ` Arnd Bergmann
2014-05-22 16:09 ` Catalin Marinas
2014-05-22 18:09 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.11.1405221406100.17310-fMhRO7WWcppj+hNMo8g0rg@public.gmane.org>
2014-05-22 18:26 ` Arnd Bergmann [this message]
2014-05-22 18:39 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.11.1405221431370.17310-fMhRO7WWcppj+hNMo8g0rg@public.gmane.org>
2014-05-22 20:25 ` Arnd Bergmann
2014-05-22 18:52 ` Linus Walleij
[not found] ` <CACRpkdZX=UFhMfUn68hA+s2FLGRYy_dmjRng_fHtAQEhah0oRA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-22 20:35 ` Arnd Bergmann
2014-05-29 9:38 ` Linus Walleij
2014-05-22 22:34 ` Sebastian Hesselbarth
[not found] ` <537E7B83.4020900-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-29 9:44 ` Linus Walleij
[not found] ` <CACRpkdap1U19EiULnq11udhY91UnnNu_-5MnLby3idbdjzBj4Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-29 10:10 ` Sebastian Hesselbarth
[not found] ` <53870787.3030202-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-29 14:13 ` Linus Walleij
[not found] ` <CACRpkdYVe+++Qb-CWrWwM1zDHxNqmpE0CFzp959Q40Zqb5sUEg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-29 14:47 ` Sebastian Hesselbarth
2014-05-22 13:17 ` Rob Herring
[not found] ` <CAL_JsqLN_f1uvrY6w7J7ZcR9pfM0_XKYMQ5YU8F4yAcMW+oDGw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-22 13:30 ` Linus Walleij
[not found] ` <CACRpkdaqsVUDA+6NC=EQmxcnDAnJEfPNYoptrEv=nq=eZEbA_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-22 13:36 ` Arnd Bergmann
2014-05-28 22:47 ` Rob Herring
2014-05-22 13:41 ` Jason Cooper
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