From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: CSB5 IDE does not fully support native mode?? Date: Thu, 26 May 2005 15:24:39 +0100 Message-ID: <1117117463.5743.149.camel@localhost.localdomain> References: <200505242026.DJT32107@ms3.netsolmail.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from [81.2.110.250] ([81.2.110.250]:3761 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S261261AbVEZO0t (ORCPT ); Thu, 26 May 2005 10:26:49 -0400 In-Reply-To: <200505242026.DJT32107@ms3.netsolmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: evt@texelsoft.com Cc: Linux Kernel Mailing List , linux-ide@vger.kernel.org On Maw, 2005-05-24 at 21:26, evt@texelsoft.com wrote: > Can someone explain what the issue is and what I might need to > do to use csb5 ide in native mode? thanks. In order to keep the legacy world from falling to bits IDE and VGA have some ugly hacks in the PCI spec. In legacy mode an IDE device appears at the "old" standard IDE addresses and uses an external IRQ pin wired to the ISA IRQ lines (14 or 15). In native mode it behaves like a PCI device, honouring the PCI bars and using the PCI INT lines. >>From a performance perspective the difference is essentially irrelevant and from a wiring perspective its often decided irrevocably by the board maker.