linux-kernel - Re: [PATCH] libata-sff: Don't call bmdma

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Date:	Fri, 26 Jan 2007 00:17:25 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	dwmw2@...radead.org, alan@...rguk.ukuu.org.uk, jgarzik@...ox.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libata-sff: Don't call bmdma_stop on non DMA capable
 controllers

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Thu, 25 Jan 2007 22:18:21 -0800 (PST)

> So on sparc64, "ioport_resource" really is just a container for the actual 
> per-domain resource buckets that the hardware (within that domain) will 
> then do the resource allocation from. Afaik.
> 
> But you should actaully verify that with somebody like Davem if you 
> _really_ care.  I cc'd him in case he wants to pipe up and perhaps prove 
> me wrong.

They are all physical addresses of the I/O locations.

It just so happens that all the non-memory physicall addresses
have some high bit set.

So it all works out, but not intentionally, it's merely a side
effect of how the physical address space is layed out.
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