From: Jesse Barnes <jbarnes@engr.sgi.com>
To: James Bottomley <James.Bottomley@steeleye.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"David S. Miller" <davem@davemloft.net>,
matthew@wil.cx, SCSI Mailing List <linux-scsi@vger.kernel.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: iomapping a big endian area
Date: Thu, 7 Apr 2005 16:57:53 -0700 [thread overview]
Message-ID: <200504071657.54172.jbarnes@engr.sgi.com> (raw)
In-Reply-To: <1112624705.5813.19.camel@mulgrave>
On Monday, April 4, 2005 7:25 am, James Bottomley wrote:
> On Mon, 2005-04-04 at 15:16 +0100, Christoph Hellwig wrote:
> > The IOC4 device that provides IDE, serial ports and external interrupts
> > on Altix systems has a big endian register layour, and the PCI-X bridge
> > in those Altix systems can do the swapping if a special bit is set.
> >
> > In older kernels that bit was set from the driver through a special API,
> > but it seems the firmware does that automatically now.
>
> We already have some unusual code in drivers to support other altix
> design ... features ... do you regard this as something that's likely to
> be replicated on other platforms, or is it more in the category of a one
> off mistake that can be corrected in firmware?
The whole line of altix pci bridges can do byteswapping, so it's more than
just one product that could benefit (however slightly). Not sure about other
bridges though.
Jesse
next prev parent reply other threads:[~2005-04-08 0:00 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-02 20:52 [PATCH] finally fix 53c700 to use the generic iomem infrastructure James Bottomley
2005-04-03 1:37 ` iomapping a big endian area Matthew Wilcox
2005-04-03 2:38 ` David S. Miller
2005-04-03 3:10 ` Matthew Wilcox
2005-04-03 3:40 ` James Bottomley
2005-04-03 4:08 ` David S. Miller
2005-04-03 4:27 ` James Bottomley
2005-04-04 7:50 ` Benjamin Herrenschmidt
2005-04-04 13:59 ` James Bottomley
2005-04-04 14:16 ` Christoph Hellwig
2005-04-04 14:25 ` James Bottomley
2005-04-07 23:57 ` Jesse Barnes [this message]
2005-04-04 14:22 ` Randy.Dunlap
2005-04-04 23:41 ` Benjamin Herrenschmidt
2005-04-04 23:43 ` Benjamin Herrenschmidt
2005-04-04 7:49 ` Benjamin Herrenschmidt
2005-04-05 7:42 ` Russell King
2005-04-05 14:05 ` James Bottomley
2005-04-05 18:55 ` Russell King
2005-04-05 20:02 ` Maciej W. Rozycki
2005-04-04 21:17 ` James Bottomley
2005-04-05 7:21 ` Christoph Hellwig
2005-04-05 14:05 ` James Bottomley
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