Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751059AbdLaMp3 (ORCPT ); Sun, 31 Dec 2017 07:45:29 -0500 Received: from www.llwyncelyn.cymru ([82.70.14.225]:55568 "EHLO fuzix.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750762AbdLaMp2 (ORCPT ); Sun, 31 Dec 2017 07:45:28 -0500 Date: Sun, 31 Dec 2017 12:44:57 +0000 From: Alan Cox To: Daniel Vetter Cc: Max Staudt , Neil Armstrong , Bartlomiej Zolnierkiewicz , Linux Fbdev development list , michal@markovi.net, sndirsch@suse.com, Oliver Neukum , Takashi Iwai , dri-devel , Linux Kernel Mailing List , Bero =?UTF-8?B?Um9zZW5rcsOk?= =?UTF-8?B?bnplcg==?= , philm@manjaro.org Subject: Re: [RFC PATCH v2 00/13] Kernel based bootsplash Message-ID: <20171231124457.12e954f8@alans-desktop> In-Reply-To: References: <20171213194755.3409-1-mstaudt@suse.de> <20171219161630.GI26573@phenom.ffwll.local> <2f8a1a08-911d-a511-2968-4d89418ac212@suse.de> <573d4050-7607-b8e4-7552-83966f551ba3@suse.de> <20171220094355.GJ26573@phenom.ffwll.local> <20171220101421.GM26573@phenom.ffwll.local> <5dc7f218-9113-fad3-c0a8-883c4bae4e02@suse.de> 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-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 912 Lines: 20 > So fundamentally I don't think an in-kernel bootsplash is a bad idea. > But most likely you want this on a highly embedded system, which It wouldn't be in kernel on such a device, it'll be in the bootstrap before (or on a dual core device quite possibly while) the kernel data is being uncompressed. Most displays need some time to stabilize clocks and PLLs so you have to get the mode set up really really early on embedded devices where in some cases you've got regulatory requirements to show something on the display really really quickly. Consumers perceive a second from on to displaying something as sluggish on a fixed function device. > probably is compiled for your exact hw, with pretty much everything > built in. Also, no fbcon, maybe even no vt subsystem at all. > Definitely not your general purpose distro. Probably no console or tty layer even present, no keyboard drivers, no mouse. Alan