From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 24 May 2002 09:19:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 24 May 2002 09:19:00 -0400 Received: from [195.63.194.11] ([195.63.194.11]:18446 "EHLO mail.stock-world.de") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Fri, 24 May 2002 09:18:58 -0400 Message-ID: <3CEE2EE2.1040407@evision-ventures.com> Date: Fri, 24 May 2002 14:15:30 +0200 From: Martin Dalecki User-Agent: Mozilla/5.0 (X11; U; Linux i686; pl-PL; rv:1.0rc1) Gecko/20020419 X-Accept-Language: en-us, pl MIME-Version: 1.0 To: Vojtech Pavlik CC: Oleg Drokin , "Gryaznova E." , martin@dalecki.de, Linux Kernel , Reiserfs developers mail-list Subject: Re: [reiserfs-dev] Re: IDE problem: linux-2.5.17 In-Reply-To: <3CECF59B.D471F505@namesys.botik.ru> <3CECFC5B.3030701@evision-ventures.com> <20020523193959.A2613@namesys.com> <3CED004A.6000109@evision-ventures.com> <20020524005057.F27005@ucw.cz> <3CEE1DFE.4080500@evision-ventures.com> <20020524151536.C636@ucw.cz> Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Użytkownik Vojtech Pavlik napisał: > On Fri, May 24, 2002 at 01:03:26PM +0200, Martin Dalecki wrote: > >>Użytkownik Vojtech Pavlik napisał: >> >> >>>>Hmm thinking again about it... It occurrs to me >>>>that actually there should be a mechanism which tells the >>>>host chip drivers whatever there are only just one or >>>>two drivers connected. I will have to look in to it. >>> >>> >>>There is no such mechanism (except for probing the drives). IDE has >>>quite nonsensical "split" termination - the termination resistors are >>>always present even on the middle device. This is to "simplify" things >>>... >>> >> >>Yes there is the host chip timer setting is basically >>changing the termination properties on the hsot chips part >>of the connection. This is the reason I was thinking >>that making the driver for it know how many drivers >>are attached to it could make some sense. > > > Hmm, interesting. Is it on all chips or just some? I don't know about > anything like that on Intel, VIA, nVidia, AMD, SiS and Artop controllers ... Hey what I'm talking about is the "physics" of the hardware. But I would rather expect sane hardware to deal with it transparently to the programmer of the setup registers.