Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755291Ab1EBXgZ (ORCPT ); Mon, 2 May 2011 19:36:25 -0400 Received: from mail-iy0-f174.google.com ([209.85.210.174]:56422 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753958Ab1EBXgY convert rfc822-to-8bit (ORCPT ); Mon, 2 May 2011 19:36:24 -0400 MIME-Version: 1.0 In-Reply-To: <20110502230118.GE28001@n2100.arm.linux.org.uk> References: <90477150.2231869.1304372815517.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net> <1319927287.2232106.1304373011082.JavaMail.root@sz0140a.emeryville.ca.mail.comcast.net> <20110502230118.GE28001@n2100.arm.linux.org.uk> From: Grant Likely Date: Mon, 2 May 2011 17:36:04 -0600 X-Google-Sender-Auth: KBGLNlg09eGBu_aljF-LSBtOxdo Message-ID: Subject: Re: [RFC PATCH 4/4] ARM: Xilinx: Adding Xilinx board support To: Russell King - ARM Linux Cc: johnlinn@comcast.net, Arnd Bergmann , nicolas pitre , devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, john linn , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1305 Lines: 33 On Mon, May 2, 2011 at 5:01 PM, Russell King - ARM Linux wrote: > On Mon, May 02, 2011 at 09:50:11PM +0000, johnlinn@comcast.net wrote: >> Seems easy enough assuming we don't need the SCU early for the core count >> and can get that from the device tree. > > Beware. ?Things may not be that trivial when you start considering some > of the weirdnesses that some vendors start coming out with. > >> Since the SCU and part of the GIC end up in the same 4K page they need to be >> together (unless I'm thinking about that wrong). >> >> SCU 0xF8000000 >> GIC_CPU 0xF8000100 >> GIC_DIS 0xF8001000 > > It is preferable to use the same mapping, as it ensures that you're not > going to create incompatible aliases. > > But, before we get too bogged down with this, please realise that it is > possible to setup early mappings from the device tree for things like the > SCU. ?Maybe not using ioremap(), but I'm sure we can find some way to use > the iotable_init() stuff to setup some early mappings from DT for this > stuff. absolutely. g. -- 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/