From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 12 Oct 2020 16:32:12 +0200 From: Borislav Petkov 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 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Disposition: inline List-ID: 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 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