Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751983AbbEGWZa (ORCPT ); Thu, 7 May 2015 18:25:30 -0400 Received: from eddie.linux-mips.org ([148.251.95.138]:52799 "EHLO cvs.linux-mips.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750876AbbEGWZ2 (ORCPT ); Thu, 7 May 2015 18:25:28 -0400 Date: Thu, 7 May 2015 23:25:23 +0100 (BST) From: "Maciej W. Rozycki" To: Peter Hurley cc: Robert Schwebel , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de Subject: Re: earlycon: no match? In-Reply-To: <554BD56D.9010800@hurleysoftware.com> Message-ID: References: <20150503211054.GR15254@pengutronix.de> <55477BC1.6000805@hurleysoftware.com> <20150504194229.GR15254@pengutronix.de> <5547D4DB.8060300@hurleysoftware.com> <20150504205241.GT15254@pengutronix.de> <5547E447.9020604@hurleysoftware.com> <554B9F43.6000702@hurleysoftware.com> <554BD56D.9010800@hurleysoftware.com> User-Agent: Alpine 2.11 (LFD 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1357 Lines: 31 On Thu, 7 May 2015, Peter Hurley wrote: > > How does this overload interact with multiple `console=' options being > > present BTW, which one is considered the early console? Or do we support > > driving multiple early consoles in parallel just as we do with regular > > consoles? > > Please familiarize yourself with the existing 'console=' and 'earlycon=' > command line options documented in Documentation/kernel-parameters.txt Thank you for your suggestion, however that documentation does not answer my questions I am afraid (and neither does serial-console.txt). Otherwise I wouldn't have asked them in the first place. If you don't know the answers either, then it's OK to say: "I don't know". E.g. (given the parameter aliasing we have) will: `earlycon=uart8250,io,0x3f8 console=tty0' `console=tty0 earlycon=uart8250,io,0x3f8' do what I expect it to, that is open the UART at 0x3f8 as an early console and then hand it over to the ttyS0 device as respectively a secondary and the primary (/dev/console) regular console? I've skipped options such as baud rates for brevity. Maciej -- 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/