linux-kernel - Re: [patch] pci: revert "PCI: remove transparent bridge sizing"

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Date:	Wed, 26 Mar 2008 15:47:03 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Ingo Molnar <mingo@...e.hu>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Gary Hade <garyhade@...ibm.com>,
	Thomas Meyer <thomas@...3r.de>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>, pm@...ian.org
Subject: Re: [patch] pci: revert "PCI: remove transparent bridge sizing"

On Thu, 27 Mar 2008, Benjamin Herrenschmidt wrote:
> 
> I was talking about IO not memory mostly here.

Yeah, low IO is also reserved on PC's (the low 256 IO ports are 
motherboard resources and contain stuff like legacy DMA channel setup 
etc).

You could imagine having it behind a PCI bridge, but in practice it's 
always on the NB/SB (and if you want to support some of the odder things 
like the NMI reason and the i387 error ports, they pretty much have to 
be - it would be insane to make a special PCI chips on a separate bus 
that does things like that).

			Linus
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