From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: 2.6.32: Promise UDMA33 card refuses to work in UDMA mode Date: Tue, 05 Jan 2010 05:04:42 -0500 Message-ID: <4B430EBA.1030908@garzik.org> References: <20091224181300.GA4654@flint.arm.linux.org.uk> <20091224215451.GA2476@flint.arm.linux.org.uk> <20100103002314.GA16528@flint.arm.linux.org.uk> <20100103234655.GB24920@flint.arm.linux.org.uk> <20100104103756.6cfa5b3a@lxorguk.ukuu.org.uk> <20100104133024.GA10521@flint.arm.linux.org.uk> <4B428FF5.7040702@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-yx0-f188.google.com ([209.85.210.188]:34906 "EHLO mail-yx0-f188.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750782Ab0AEKEr (ORCPT ); Tue, 5 Jan 2010 05:04:47 -0500 Received: by yxe26 with SMTP id 26so15454738yxe.4 for ; Tue, 05 Jan 2010 02:04:44 -0800 (PST) In-Reply-To: <4B428FF5.7040702@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Robert Hancock Cc: Russell King , Alan Cox , linux-ide@vger.kernel.org On 01/04/2010 08:03 PM, Robert Hancock wrote: > rom ATA-8 APT: > > "HDMA0: Check_Status State: This state is entered when the host has > written a DMA command to the device; when all data for the command has > been transferred and nIEN is set to one; or when all data for the > command has been transferred, nIEN is cleared zero, and INTRQ has been > asserted. > > When in this state, the host shall read the device Status register. When > entering this state from the HI4 state, the host shall wait 400 ns > before reading the Status register. When entering this state from the > HDMA1 state, > the host shall wait one PIO transfer cycle time before reading the > Status register. The wait may be accomplished by reading the Alternate > Status register and ignoring the result." Indeed... I had forgotten about that bit. Jeff