From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751710AbbAPK6j (ORCPT ); Fri, 16 Jan 2015 05:58:39 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:35724 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751090AbbAPK6g (ORCPT ); Fri, 16 Jan 2015 05:58:36 -0500 Date: Fri, 16 Jan 2015 10:58:04 +0000 From: Mark Rutland To: Jon Masters Cc: "linux-acpi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , leif.lindholm@linaro.org Subject: Re: SPCR table parsing Message-ID: <20150116105804.GF21809@leverpostej> References: <54B880B5.6010907@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <54B880B5.6010907@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 16, 2015 at 03:08:37AM +0000, Jon Masters wrote: > Hi Folks, > > We're implementing support for SPCR table parsing shortly[0], since it > will allow to deprecate supplying a "console=" (and eventually, also > "earlycon=") on 64-bit ARM servers, where it's not always the case that > we can assume a 16550 at a specific address. SPCR has been provided on > x86 systems since 2000 but is not (yet) supported by Linux. For anyone using DT rather than ACPI, the same can be achieved in mainline with /chosen/stdout-path as of: 7914a7c5651a5161 "of: support passing console options with stdout-path" Documented in: 2a9d832cc9aae21e "of: Add bindings for chosen node, stdout-path" e.g. uart: serial@f00 { reg = <0xf00 0x200>; compatible = "vendor,some-serial-device"; }; chosen { stdout-path = "/serial@f00:115200n8"; }; This will be used for both the console and earlycon. Please make use of this where possible. Thanks, Mark.