From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1443743-1518443298-2-516563704295993139 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no ("Email failed DMARC policy for domain") X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.001, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org' X-Spam-charsets: plain='windows-1252' X-IgnoreVacation: yes ("Email failed DMARC policy for domain") X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-serial-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1518443298; b=KL/GkeNPbUqiy/oW3lRh5LQ8EO0WmZomySKDjnA6Da38fVm 2bM0x5RJvH/4Avj75sgxcTtV9vJv/yAX1DizrblJZNsHq7RKAj8Tnoj0tWhHRnfa BbRLE4WB79WXRkF9aVWxKZF6C2z++5DR2LoVxo6mjQG2LFxyxe/27lHvzvnq/eaE WPr2SZyJ1vpXgvCcPAwhXd0XcW/HodQw2saSglh237qVixE0U1Gi8BqE1+TCZvpe 8+5Sd2QuI/e6tV58BzegW/OkO1tjdoYSODnJrX4H2A2nd70dhXEgRxOiCEXWL8U4 a0sWL+1vrB1EXmt/z1jdmUvps55x13DF0S0pZ4g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=subject:to:references:cc:from:message-id :date:mime-version:in-reply-to:content-type :content-transfer-encoding:sender:list-id; s=arctest; t= 1518443298; bh=dGSheOdRrNswu6mzFJ8gnfTSfF5IJNGiyDYXVAGuL24=; b=N HZKGlkRO3dfnwhB3BMWUneFrTqt05mbD2GLB2HJ8dGd72ZCgkzOIkFY6wcjjKhoR WOCfnb0H/eLYyVCjt6vYsUwK2p3GAWhIVvV+PSEwIrW46pmGCSRG3ne8HK1iFdNo ilNeFggNif+gbsUQN+JEEy+Z5ciludgslXnbE9EIbQ6kkLhG51idbNxbhlvywXWZ d3bMokj36tWbQg9KwQrJRncr+pRnANH1e1HI9ChNtkObLEmUZFSBum+OY4FR00o9 sYjxF4a/Wj6uWUPqJXJDodqdasGRR0XljrUBTv6EvJ1dfaEFWVqxRpD4jMztlb0O F1t8wly7LRVzPoj+BH0fg== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=redhat.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-serial-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=redhat.com header.result=pass header_is_org_domain=yes Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=redhat.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-serial-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=redhat.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933420AbeBLNsG (ORCPT ); Mon, 12 Feb 2018 08:48:06 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:39704 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933332AbeBLNsD (ORCPT ); Mon, 12 Feb 2018 08:48:03 -0500 Subject: Re: [PATCH] acpi, spcr: Make SPCR available to x86 To: Peter Zijlstra References: <20180118150951.28964-1-prarit@redhat.com> <20180212133429.GC25314@hirez.programming.kicks-ass.net> Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-serial@vger.kernel.org, Bhupesh Sharma , Lv Zheng , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Jonathan Corbet , Catalin Marinas , Will Deacon , Timur Tabi , graeme.gregory@linaro.org, mark.salter@redhat.com From: Prarit Bhargava Message-ID: <1e69fffc-1c3b-8cc0-f1cb-695de5ccdcb5@redhat.com> Date: Mon, 12 Feb 2018 08:47:57 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 MIME-Version: 1.0 In-Reply-To: <20180212133429.GC25314@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-serial-owner@vger.kernel.org X-Mailing-List: linux-serial@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 02/12/2018 08:34 AM, Peter Zijlstra wrote: > On Thu, Jan 18, 2018 at 10:09:51AM -0500, Prarit Bhargava wrote: >> config ACPI_SPCR_TABLE >> + bool "ACPI Serial Port Console Redirection Support" >> + default y if X86 >> + help >> + Enable support for Serial Port Console Redirection (SPCR) Table. >> + This table provides information about the configuration of the >> + earlycon console. > > I just got asked this by oldconfig, which left me rather puzzled, WTF > does this do? Odd -- I thought I had taken care of that :( My apologies Peter. ACPI SPCR is used by a vendor to define the serial console for a system. If SPCR exists a user can add kernel parameter "earlycon" (no extra kernel parameters) and the console will work out-of-the-box. The serial console configuration varies from vendor to vendor. This takes the guess-work out of defining a serial console. P. >