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=-3.9 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 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 AAC49C433E7 for ; Mon, 12 Oct 2020 16:43:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3CB9B2080A for ; Mon, 12 Oct 2020 16:43:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="RFVMFif8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403952AbgJLQnO (ORCPT ); Mon, 12 Oct 2020 12:43:14 -0400 Received: from mail.skyhub.de ([5.9.137.197]:55632 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403844AbgJLQnN (ORCPT ); Mon, 12 Oct 2020 12:43:13 -0400 Received: from zn.tnic (p200300ec2f0692001c25a8ecc208ce91.dip0.t-ipconnect.de [IPv6:2003:ec:2f06:9200:1c25:a8ec:c208:ce91]) (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 5E5221EC038E; Mon, 12 Oct 2020 18:43:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1602520992; 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=02Nq2GzruJylEKWJf8PrXOs4tMxUNALrCv4iiieD2DM=; b=RFVMFif8o66KZF+g46AeV1XTCzg3gNUGY8K8nUJhFCGRoHrJCAb17Jzfang+biVkh3aNys 1MtoZh/ZDPNTW2pwMK4pmfs4z0ksh0NDuiEqqaS/rvplzAKeraO1JA6S2lhUxrVJEzfnMX afptsXqx6m344ZZhU6A0xXc3MEeubkE= Date: Mon, 12 Oct 2020 18:43:08 +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: <20201012164308.GF22829@zn.tnic> References: <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> <20201012143212.GC22829@zn.tnic> <20201012144040.GB11614@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 04:10:45PM +0100, Guillaume Tucker wrote: > You can get serial console on recent enough Chromebooks with a > debug interface such as SuzyQable: > > https://www.sparkfun.com/products/14746 > > It's not a USB Type-C adapter, it has a debug interface which > works with Chromebooks that support Case-Closed Debugging. > Anyone can do that without modifying the Chromebook, and with a > bit of patience to go through the documentation[1]... > > The KernelCI sample results from my previous email were run using > just that: off-the-shelf Chromebooks + SuzyQ + rebuilt firmware > for interactive console and tftp boot + kernel with the config > options in Enric's patch. That sounds interesting, thanks for elaborating. At the same time, you see how this setup is very hw-specific and not really common and those options do not really belong in a defconfig but in a kernelCI snippet, I'd say. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette