From: Mark Lord <liml@rtr.ca>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Tejun Heo <htejun@gmail.com>, Jeff Garzik <jgarzik@pobox.com>,
IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: [PATCH/RFC]: recovery from power-up-in-standby feature
Date: Sun, 04 Mar 2007 17:04:54 -0500 [thread overview]
Message-ID: <45EB4286.7040108@rtr.ca> (raw)
In-Reply-To: <20070304223206.65195c66@lxorguk.ukuu.org.uk>
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
next prev parent reply other threads:[~2007-03-04 22:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-04 20:43 [PATCH/RFC]: recovery from power-up-in-standby feature Mark Lord
2007-03-04 22:32 ` Alan Cox
2007-03-04 22:04 ` Mark Lord [this message]
2007-03-04 23:37 ` Jeff Garzik
2007-03-05 3:55 ` Mark Lord
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