From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: [PATCH/RFC]: recovery from power-up-in-standby feature Date: Sun, 04 Mar 2007 17:04:54 -0500 Message-ID: <45EB4286.7040108@rtr.ca> References: <45EB2F6D.7050407@rtr.ca> <20070304223206.65195c66@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([64.26.128.89]:1607 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750868AbXCDWE4 (ORCPT ); Sun, 4 Mar 2007 17:04:56 -0500 In-Reply-To: <20070304223206.65195c66@lxorguk.ukuu.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Tejun Heo , Jeff Garzik , IDE/ATA development list Alan Cox wrote: >> (2) The more common method is for the drive to require an explicit >> set-features "spin-up" subcommand after the IDENTIFY. > > I notice there is no ATA version check - was this feature in all versions > of ATA ? No, the feature was not in early versions. But it is not entirely clear to me that the version information is actually guaranteed to be present in all cases before the drive has spun-up. Instead, the standards seem to be relying upon detection of the "power up in standby" signature values. The signature word (2) has been "reserved" from ATA1 onward, and the only assigned uses thus far are for the specific signatures that this patch looks for. Cheers