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Fri, 6 Apr 2018 09:47:37 -0400 Received: from www.llwyncelyn.cymru ([82.70.14.225]:55858 "EHLO fuzix.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933139AbeDFNrf (ORCPT ); Fri, 6 Apr 2018 09:47:35 -0400 Date: Fri, 6 Apr 2018 14:47:13 +0100 From: Alan Cox To: Aaron Durbin Cc: Andy Shevchenko , Daniel Kurtz , Ricardo Ribalda Delgado , Greg Kroah-Hartman , Jiri Slaby , Marc Gonzalez , Doug Anderson , Matt Redfearn , Jeffy , "open list:SERIAL DRIVERS" , Linux Kernel Mailing List Subject: Re: [PATCH 1/3] serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge Message-ID: <20180406144713.30d1ca00@alans-desktop> In-Reply-To: References: <20180314003655.12141-1-djkurtz@chromium.org> <20180314003655.12141-2-djkurtz@chromium.org> <20180326192428.71c23abf@alans-desktop> <20180329143400.6d9256a5@alans-desktop> Organization: Intel Corporation X-Mailer: Claws Mail 3.15.1-dirty (GTK+ 2.24.31; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII 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: > But we don't have the full ACPI interpreter up in the early part of > the kernel. All these 'early' devices have their own setup/config > which is the source of the issue. Or maybe I am wrong about the full > interpreter and the early drivers are just not taking advantage of the > ACPI device binding? In very early boot with serial console you just have to pray. No change there. Once ACPI comes up you however have the information to populate everything and configure correctly. So it should work fine except for kernel hackers trying to do early boot debug, which is a small (but important) cornercase ? Alan