From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: nicolas pitre
<nicolas.pitre-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Russell King - ARM Linux
<linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
johnlinn-Wuw85uim5zDR7s880joybQ@public.gmane.org
Subject: Re: [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support
Date: Tue, 3 May 2011 09:58:14 +0200 [thread overview]
Message-ID: <201105030958.14698.arnd@arndb.de> (raw)
In-Reply-To: <20110502230118.GE28001-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
On Tuesday 03 May 2011 01:01:18 Russell King - ARM Linux wrote:
> It is preferable to use the same mapping, as it ensures that you're not
> going to create incompatible aliases.
Is aliasing a problem for MMIO mappings? I would think that you can
ioremap registers anywhere and as often as you want because they are
never cacheable.
> But, before we get too bogged down with this, please realise that it is
> possible to setup early mappings from the device tree for things like the
> SCU. Maybe not using ioremap(), but I'm sure we can find some way to use
> the iotable_init() stuff to setup some early mappings from DT for this
> stuff.
Good point. It doesn't really matter how the entries get into the page
table, whether you call it ioremap, iotable_init, create_mapping or
ioremap_early. What matters is that we don't hardcode the physical
address in the board code, because that limits the possible reuse
on other device tree enabled targets.
Arnd
next prev parent reply other threads:[~2011-05-03 7:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <90477150.2231869.1304372815517.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net>
2011-05-02 21:50 ` [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support johnlinn
[not found] ` <1319927287.2232106.1304373011082.JavaMail.root-2//McUVsTWSpNjDeV5bKuMcQQQXLS/gekU1+q43GAIqQvBXZIOnqxg@public.gmane.org>
2011-05-02 23:01 ` Russell King - ARM Linux
2011-05-02 23:36 ` Grant Likely
[not found] ` <20110502230118.GE28001-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2011-05-03 7:58 ` Arnd Bergmann [this message]
[not found] ` <201105030958.14698.arnd-r2nGTMty4D4@public.gmane.org>
2011-05-03 8:52 ` Russell King - ARM Linux
[not found] ` <20110503085220.GL28001-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2011-05-03 10:35 ` Arnd Bergmann
[not found] <1518608384.2203937.1304349657551.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net>
2011-05-02 21:27 ` johnlinn
[not found] ` <538266033.2230575.1304371624720.JavaMail.root-2//McUVsTWSpNjDeV5bKuMcQQQXLS/gekU1+q43GAIqQvBXZIOnqxg@public.gmane.org>
2011-05-02 21:36 ` Arnd Bergmann
2011-05-02 5:07 [RFC PATCH 0/4] ARM: Basic Xilinx Support Grant Likely
2011-05-02 5:08 ` [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support Grant Likely
2011-05-02 7:06 ` Michal Simek
2011-05-02 8:39 ` Arnd Bergmann
[not found] ` <201105021039.32374.arnd-r2nGTMty4D4@public.gmane.org>
2011-05-02 13:29 ` Rob Herring
[not found] ` <4DBEB1A8.3040202-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-02 15:52 ` Arnd Bergmann
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