Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261250AbVDDO0K (ORCPT ); Mon, 4 Apr 2005 10:26:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261249AbVDDO0K (ORCPT ); Mon, 4 Apr 2005 10:26:10 -0400 Received: from stat16.steeleye.com ([209.192.50.48]:10719 "EHLO hancock.sc.steeleye.com") by vger.kernel.org with ESMTP id S261264AbVDDOZr (ORCPT ); Mon, 4 Apr 2005 10:25:47 -0400 Subject: Re: iomapping a big endian area From: James Bottomley To: Christoph Hellwig Cc: Benjamin Herrenschmidt , "David S. Miller" , matthew@wil.cx, SCSI Mailing List , Linux Kernel list In-Reply-To: <20050404141616.GA10384@infradead.org> References: <1112475134.5786.29.camel@mulgrave> <20050403013757.GB24234@parcelfarce.linux.theplanet.co.uk> <20050402183805.20a0cf49.davem@davemloft.net> <20050403031000.GC24234@parcelfarce.linux.theplanet.co.uk> <1112499639.5786.34.camel@mulgrave> <20050402200858.37347bec.davem@davemloft.net> <1112502477.5786.38.camel@mulgrave> <1112601039.26086.49.camel@gaston> <1112623143.5813.5.camel@mulgrave> <20050404141616.GA10384@infradead.org> Content-Type: text/plain Date: Mon, 04 Apr 2005 09:25:05 -0500 Message-Id: <1112624705.5813.19.camel@mulgrave> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-2) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 928 Lines: 21 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? James - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/