From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Sealey Subject: Re: CompactFlash and HD unhappy together on the same IDE channel Date: Sun, 23 Sep 2007 15:49:27 +0100 Message-ID: <46F67CF7.3080407@genesi-usa.com> References: <46C69913.1060505@g7.org> <46C799E8.8080407@rtr.ca> <20070819175632.349d11c5@the-village.bc.nu> <46EC70A0.1000800@g7.org> <20070922191248.5f2bc74a@the-village.bc.nu> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mithrandir.softwarenexus.net ([66.98.186.96]:3285 "EHLO mail.genesi-usa.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754036AbXIWOrp (ORCPT ); Sun, 23 Sep 2007 10:47:45 -0400 In-Reply-To: <20070922191248.5f2bc74a@the-village.bc.nu> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Malcolm Gillies , Mark Lord , linux-ide@vger.kernel.org Alan Cox wrote: >> I've acquired a new CF card that is capable of UDMA2, and with the same >> connectors, wiring and adaptor (i.e. I popped out the MWDMA card and >> inserted the UDMA one), I can now boot and read data on both devices >> without error at reasonable speeds. > > Fascinating. Does point more to a driver funny you are right. At the > moment I'm at a loss to guess what Why would it be a driver quirk just because it now works when it didn't before? There are plenty of completely WEIRD people out there who install SCSI systems in a Y configuration with a controller in the middle and both ends terminated (or one end not or one end with a real terminator and the other using drive termination) which is totally out of spec and so on but *works* just fine by some random chance of chipset, drives and cable length.. Doesn't UDMA checksum transfers, where MWDMA doesn't - or some drive to controller intervention which would silently retry where MWDMA would just pop it's guts all over your system? -- Matt Sealey Genesi, Manager, Developer Relations