From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261350AbULXAne (ORCPT ); Thu, 23 Dec 2004 19:43:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261352AbULXAne (ORCPT ); Thu, 23 Dec 2004 19:43:34 -0500 Received: from clock-tower.bc.nu ([81.2.110.250]:28564 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S261350AbULXAnd (ORCPT ); Thu, 23 Dec 2004 19:43:33 -0500 Subject: Re: DMA problems with 3+ Promise IDE controllers From: Alan Cox To: Jaco van der Schyff Cc: Linux Kernel Mailing List In-Reply-To: <41CB1BE3.465BD490@netgroup.co.za> References: <41CB1BE3.465BD490@netgroup.co.za> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1103845162.15233.9.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Thu, 23 Dec 2004 23:39:24 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Iau, 2004-12-23 at 19:26, Jaco van der Schyff wrote: > Any idea how I could get all three cards to work in UDMA100 mode? You either need multiple independant PCI busses or to write an arbitrator for the IDE DMA layer to ensure that no more than two of the three are doing DMA transfers at a time and the other waits. Alan