Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761543AbZD0UsU (ORCPT ); Mon, 27 Apr 2009 16:48:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760216AbZD0Ury (ORCPT ); Mon, 27 Apr 2009 16:47:54 -0400 Received: from az33egw02.freescale.net ([192.88.158.103]:49044 "EHLO az33egw02.freescale.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759738AbZD0Ury (ORCPT ); Mon, 27 Apr 2009 16:47:54 -0400 Date: Mon, 27 Apr 2009 15:47:52 -0500 From: Scott Wood To: Timur Tabi Cc: David Hawkins , linuxppc-dev@ozlabs.org, Dan Williams , Liu Dave-R63238 , linux-kernel@vger.kernel.org, Ira Snyder Subject: Re: [PATCH] fsldma: use PCI Read Multiple command Message-ID: <20090427204752.GA22406@ld0162-tx32.am.freescale.net> References: <20090424183517.GB23140@ovro.caltech.edu> <49F608B7.9080409@ovro.caltech.edu> <49F60A3A.4060402@freescale.com> <49F60BF8.8040404@ovro.caltech.edu> <49F60FE1.90707@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49F60FE1.90707@freescale.com> User-Agent: Mutt/1.4.1i X-Brightmail-Tracker: AAAAAQAAAWE= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1085 Lines: 27 On Mon, Apr 27, 2009 at 03:04:49PM -0500, Timur Tabi wrote: > David Hawkins wrote: > > > Can you give me an example of non-PCI memory that would be > > non-prefetchable that you'd like us to try? We can see if our > > host CPUs have an area like that ... we just need to know > > what device to look for first :) > > Hmmmm.... I was going to say any SOC device in the IMMR, but I don't see > anything there that would constitute a memory buffer. > > I test this change on an 8610 and DMA to a register I/O, where this bit > isn't even defined, and it made no difference. So I guess this change > is okay. I thought the driver only used the bit if the device tree indicated it was an 83xx-era DMA controller? That said, the bits are documented as specifically for PCI, so it would be surprising if it had any effect elsewhere. -Scott -- 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/