From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C87B7C433DF for ; Mon, 12 Oct 2020 14:32:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 77AEF20776 for ; Mon, 12 Oct 2020 14:32:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="qcHXETlW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388834AbgJLOcS (ORCPT ); Mon, 12 Oct 2020 10:32:18 -0400 Received: from mail.skyhub.de ([5.9.137.197]:33892 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727482AbgJLOcS (ORCPT ); Mon, 12 Oct 2020 10:32:18 -0400 Received: from zn.tnic (p200300ec2f06920008362ea164c1c332.dip0.t-ipconnect.de [IPv6:2003:ec:2f06:9200:836:2ea1:64c1:c332]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id BB9FA1EC0354; Mon, 12 Oct 2020 16:32:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1602513136; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=97Dm5EM+DI0yMZnhnHJXD/nSSVckzIbKcsRoTJP5Vdo=; b=qcHXETlWr5VYHugu4AsTQ+XtjrDDmq/IfZnNCFn92XP3Y+j3f/xW9oDssjZuMUXFGbybZA FwofYpOZh6i2ff4SuaKD/M7wtussmMQZia+SJHQHgG1+UvZ9MQZbJyXk6yWNtBlqP/6WYc An6Svbyg2/f/T5XOFFDEMkZGsCTB3B8= Date: Mon, 12 Oct 2020 16:32:12 +0200 From: Borislav Petkov To: Guillaume Tucker Cc: Willy Tarreau , Enric Balletbo i Serra , Randy Dunlap , linux-kernel@vger.kernel.org, x86@kernel.org, Collabora Kernel ML , Thomas Gleixner , Ingo Molnar , Diego Elio =?utf-8?Q?Petten=C3=B2?= , "H. Peter Anvin" , "Martin K. Petersen" , Nathan Chancellor , kernelci@groups.io Subject: Re: [PATCH] x86/x86_64_defconfig: Enable the serial console Message-ID: <20201012143212.GC22829@zn.tnic> References: <20201008162206.862203-1-enric.balletbo@collabora.com> <20201008164044.GE5505@zn.tnic> <4162cfa4-7bf2-3e6e-1b8c-e19187e6fa10@infradead.org> <2538da14-0f4b-5d4a-c7bf-6fdb46ba2796@collabora.com> <20201011122020.GA15925@zn.tnic> <107a6fb0-a667-2f30-d1f4-640e3fee193a@collabora.com> <20201011155754.GC15925@zn.tnic> <1dfdf163-9b54-ceae-b178-c566e6109263@collabora.com> <20201012035846.GB11282@1wt.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 12, 2020 at 11:22:10AM +0100, Guillaume Tucker wrote: > However, it was found while adding some x86 Chromebooks[1] to > KernelCI that x86_64_defconfig lacked some basic things for > anyone to be able to boot a kernel with a serial console enabled > on those. Hold on, those are laptops, right? How come they do have serial console? Because laptops don't have serial console - that has been the eternal problem with debugging kernels on laptops. Or do they do some sort of serial over USB emulation and this is something which only chromebooks have? Or is that how it is done: https://www.chromium.org/chromium-os/how-tos-and-troubleshooting/serial-debugging-howto ? Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette