linux-kernel - Re: [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support

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Date:	Mon, 2 May 2011 17:36:04 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	johnlinn@...cast.net, Arnd Bergmann <arnd@...db.de>,
	nicolas pitre <nicolas.pitre@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	john linn <john.linn@...inx.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support

On Mon, May 2, 2011 at 5:01 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Mon, May 02, 2011 at 09:50:11PM +0000, johnlinn@...cast.net wrote:
>> Seems easy enough assuming we don't need the SCU early for the core count
>> and can get that from the device tree.
>
> Beware.  Things may not be that trivial when you start considering some
> of the weirdnesses that some vendors start coming out with.
>
>> Since the SCU and part of the GIC end up in the same 4K page they need to be
>> together (unless I'm thinking about that wrong).
>>
>> SCU 0xF8000000
>> GIC_CPU 0xF8000100
>> GIC_DIS 0xF8001000
>
> It is preferable to use the same mapping, as it ensures that you're not
> going to create incompatible aliases.
>
> 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.

absolutely.

g.
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