From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755825Ab2GXQYh (ORCPT ); Tue, 24 Jul 2012 12:24:37 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:57093 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755530Ab2GXQYZ (ORCPT ); Tue, 24 Jul 2012 12:24:25 -0400 Date: Tue, 24 Jul 2012 17:24:04 +0100 From: Catalin Marinas To: Christopher Covington Cc: Stephen Warren , "linux-kernel@vger.kernel.org" , Arnd Bergmann , Will Deacon Subject: Re: [08/36] AArch64: Kernel booting and initialisation Message-ID: <20120724162404.GB29519@arm.com> References: <1341608777-12982-9-git-send-email-catalin.marinas@arm.com> <500DB986.7090309@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <500DB986.7090309@codeaurora.org> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 23, 2012 at 09:52:22PM +0100, Christopher Covington wrote: > 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? Yes, this can be implemented but I think it has its own restrictions, requiring a JTAG connection. -- Catalin