Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933389Ab0KORne (ORCPT ); Mon, 15 Nov 2010 12:43:34 -0500 Received: from gate.crashing.org ([63.228.1.57]:33098 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933270Ab0KORnd convert rfc822-to-8bit (ORCPT ); Mon, 15 Nov 2010 12:43:33 -0500 Subject: Re: [PATCH v2] fsldma: add support to 36-bit physical address Mime-Version: 1.0 (Apple Message framework v1081) Content-Type: text/plain; charset=us-ascii From: Kumar Gala In-Reply-To: Date: Mon, 15 Nov 2010 11:43:12 -0600 Cc: Li Yang , dan.j.williams@intel.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8BIT Message-Id: <72D46FED-AFC8-4599-ADB0-2A2B634CCE48@kernel.crashing.org> References: <1289477789-10651-1-git-send-email-leoli@freescale.com> <54AAF9B7-9533-45B8-9C49-A964203AF707@kernel.crashing.org> <3B38AD35-39A2-4A54-8109-65D6DE436227@kernel.crashing.org> To: Timur Tabi X-Mailer: Apple Mail (2.1081) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1177 Lines: 23 On Nov 15, 2010, at 10:13 AM, Timur Tabi wrote: > On Mon, Nov 15, 2010 at 9:16 AM, Kumar Gala wrote: > >> The programming model (if you look at the free-space in the registers and data structures) supports a 64-bit address. I'm trying to avoid changing the driver in the future if we have >36-bit. However this is such a minor worry that I'll stop and just ack the patch as is. > > I must still be missing something. I'm looking at the description of > the SATR register in the MPC8572 RM, and it shows this: > > 0 - 3 | 4 - 5 | 6 | 7 | 8 - 11 | 12 - 15 | 16-21 | 22-31 > --- | STFLOWLVL | SPCIORDER | SSME | STRANSINT | SREADTTYPE | --- | ESAD > > The most that we can extend ESAD to is 16 bits, for a total of a > 48-bit physical address. Where are the other 16 bits supposed to go? I was looking at the link addresses. I stand corrected so our max is 48-bits. - k-- 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/