From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753245AbcALJhb (ORCPT ); Tue, 12 Jan 2016 04:37:31 -0500 Received: from smtp2-g21.free.fr ([212.27.42.2]:48631 "EHLO smtp2-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752758AbcALJh0 (ORCPT ); Tue, 12 Jan 2016 04:37:26 -0500 Subject: Re: [RFC PATCH] always probe UART HW when options are not specified To: Peter Hurley , Sebastian Frias Cc: Greg Kroah-Hartman , linux-serial@vger.kernel.org, LKML , Mans Rullgard References: <5672D18E.8000301@laposte.net> <5672E2CF.6080705@hurleysoftware.com> <5672E76A.3010506@laposte.net> <5672F588.8070503@hurleysoftware.com> <5672FD35.5070609@laposte.net> <56731689.70702@hurleysoftware.com> <56740FC3.50302@laposte.net> <5674204C.1000907@hurleysoftware.com> <56782DE5.7090708@laposte.net> <56798EC7.1030804@laposte.net> <5693C52B.90003@laposte.net> <5693D41E.8050601@hurleysoftware.com> <5693ECBA.50003@laposte.net> <5693FD3C.5080601@hurleysoftware.com> From: Mason Message-ID: <5694C94B.3090405@free.fr> Date: Tue, 12 Jan 2016 10:37:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0 SeaMonkey/2.39 MIME-Version: 1.0 In-Reply-To: <5693FD3C.5080601@hurleysoftware.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/01/2016 20:06, Peter Hurley wrote: > I don't have enough information to suggest what you "should" use > here. > > Is this going to be a shipping product? > Is it single-core? > etc. > > And what is your purpose for outputting early boot information > before loading the serial driver which does provide console output? I'm not sure exactly which board Sebastian has in mind, but I've been using the SERIAL_8250_RT288X driver on my Tango4 board. Note: calling the UART driver "Au1x00/RT288x" is a bit of a misnomer, as these are names of SoCs using that distinct register layout. The actual IP is probably the 16550-compatible Palmchip BK-3103. https://sites.google.com/a/palmchiptech.com/palmchiptech/product-services/hardware-services/ip-cores/bk-3103 (Not sure that this website is legitimate, though.) When I need earlyprintk support, I use this patch from Mans: http://thread.gmane.org/gmane.linux.kernel/2081016 Regards.