From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Schwebel Subject: Re: Super Fast Boot of Embedded Linux: 300 ms from boot loader to shell Date: Thu, 14 Apr 2011 20:52:04 +0200 Message-ID: <20110414185204.GJ3811@pengutronix.de> References: <4DA331F9.5070902@gmail.com> <4DA5DD10.6030305@gmail.com> <4DA6A5A7.2060701@parrot.com> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <4DA6A5A7.2060701@parrot.com> Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Matthieu CASTET Cc: Marco Stornelli , Constantine Shulyupin , "linux-embedded@vger.kernel.org" On Thu, Apr 14, 2011 at 09:43:35AM +0200, Matthieu CASTET wrote: > Not to say such case are not interesting : loading a linux kernel with > only a serial driver, a ramdisk and a shell as init doesn't reflect > reality. > > In real product what you want if fast user interaction (sound, > mounting big filesystem with user data, lcd display, ...) Well, it depends on the application. In the automotive box I've shown the barebox based boot optimizations for in my ELC-E talk, the task is to get CAN communication running in < 200 ms. For that kind of application it's useful to be in userspace as fast as possible, just in order to have one socket-can application running, and everything else comes later. rsc -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |