From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754865Ab2GWUw0 (ORCPT ); Mon, 23 Jul 2012 16:52:26 -0400 Received: from wolverine01.qualcomm.com ([199.106.114.254]:40128 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753832Ab2GWUwZ (ORCPT ); Mon, 23 Jul 2012 16:52:25 -0400 X-IronPort-AV: E=McAfee;i="5400,1158,6781"; a="213644539" Message-ID: <500DB986.7090309@codeaurora.org> Date: Mon, 23 Jul 2012 16:52:22 -0400 From: Christopher Covington User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7 MIME-Version: 1.0 To: Catalin Marinas , Stephen Warren CC: linux-kernel@vger.kernel.org, Arnd Bergmann , Will Deacon Subject: Re: [08/36] AArch64: Kernel booting and initialisation References: <1341608777-12982-9-git-send-email-catalin.marinas@arm.com> In-Reply-To: <1341608777-12982-9-git-send-email-catalin.marinas@arm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Catalin and Stephen, Catalin Marinas - July 8, 2012, 9:18 a.m. > On Fri, Jul 06, 2012 at 10:32:54PM +0100, Stephen Warren wrote: > >> Also, on Tegra at least and perhaps OMAP too, there are a few parts >> of earlyprintk serial port setup (i.e. port selection) which happen >> as part of the decompressor rather than the main kernel image, so >> we'd have to re-jig that too. > > Whatever we did on AArch32, if it was useful and we want to follow a > similar model it needs porting given that the code cannot be shared. So > there is nothing to re-jig but rather implement. > > As for earlyprintk, you can initialise it in the decompressed kernel > anyway. But even though it's a useful debugging tool, it goes against > the single Image aim (at least the current printascii/addruart > implementation). I don't have a proper implementation yet. Would DCC [1] be a reasonably commonly available early printk mechanism for the single image to provide? 1. http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/BEIHGIBB.html Thanks, Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum