linux-kernel - Re: [PATCH V5 3/4] ARM: Xilinx: base header files and assembly macros

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Message-Id: <201103301529.03648.arnd@arndb.de>
Date:	Wed, 30 Mar 2011 15:29:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	John Linn <John.Linn@...inx.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, catalin.marinas@....com,
	glikely@...retlab.ca, jamie@...ieiles.com
Subject: Re: [PATCH V5 3/4] ARM: Xilinx: base header files and assembly macros

On Wednesday 30 March 2011, John Linn wrote:
> Yes that makes sense.  We don't have immediate plans for PCI and 
> I was assuming when we add PCI we would need to change that.  
> 
> If you think I shouldn't put it off then I'll fix it now.  My 
> preference was to get the platform supported, then add more features.

Getting it fixed properly depends a bit on the PCI implementation.
I've been planning to clean up this part of the ARM architecture
for some time and I can probably do it for one more platform when
I get to it.

My idea for the multiplatform kernel is to have a global I/O space
window (maybe 1 MB) that is in the same location in the virtual
address space all the time, so any platform that wants to support
PCI with direct-mapped I/O space can simply map it in there
at boot time.

	Arnd
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