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Message-ID: <CAE2855vVXr24bOjXvU7pVcDs_X-6G-xndsUf=9jtyXVJS5G6bA@mail.gmail.com> Date: Mon, 9 Apr 2018 10:00:13 -0600 From: Aaron Durbin <adurbin@...omium.org> To: Alan Cox <gnomes@...rguk.ukuu.org.uk> Cc: Aaron Durbin <adurbin@...omium.org>, Andy Shevchenko <andy.shevchenko@...il.com>, Daniel Kurtz <djkurtz@...omium.org>, Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.com>, Marc Gonzalez <marc_gonzalez@...madesigns.com>, Doug Anderson <dianders@...omium.org>, Matt Redfearn <matt.redfearn@...s.com>, Jeffy <jeffy.chen@...k-chips.com>, "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/3] serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge On Fri, Apr 6, 2018 at 7:47 AM, Alan Cox <gnomes@...rguk.ukuu.org.uk> wrote: >> 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 ? Yes, I think we're on the same page. This patch series is trying to get the early console working correctly given the current code assumptions. -Aaron
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