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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [RFC/PATCH] powerpc: Rewrite IO allocation & mapping on powerpc64
Date: Mon, 14 May 2007 17:04:02 +0200
To: Arnd Bergmann <arnd@arndb.de>
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
	Anton Blanchard <anton@samba.org>
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> Do you think it's ok to not treat the range between 64k and 1M special?
> There might be ISA drivers that expect devices in there.

ISA I/O space is 16-bit addressing only.

> Maybe we should
> start PHB_IO_BASE after a 1M guard area where nothing is mapped.

This can cause problems, many PCI bridges and devices
don't decode all 32 bits of the legacy I/O address space.

> Where should Olof's PCMCIA space go? The ISA or the PHB range?

It uses the legacy IDE I/O addresses, so it needs to
go to the 64kB space.  It isn't ISA though.


Segher