linux-kernel - Re: No NCQ support on X61s Ultrabay? (Intel ICH8 SATA controller question)

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Message-ID: <20090501113533.GB10704@linux.intel.com>
Date:	Fri, 1 May 2009 04:35:33 -0700
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	Theodore Tso <tytso@....edu>,
	Alex Buell <alex.buell@...ted.org.uk>,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: No NCQ support on X61s Ultrabay?  (Intel ICH8 SATA controller
	question)

On Thu, Apr 30, 2009 at 10:21:08PM -0600, Robert Hancock wrote:
> I'm suspecting that that Ultrabay slot might be using the PATA ports on  
> the chipset, with a PATA-SATA bridge chip or something. I haven't seen  
> an Intel chipset with some SATA ports using AHCI and some in PIIX mode  
> before, the ones I've seen with both had the PIIX mode driving PATA  
> ports. If it is indeed bridged through PATA on that laptop, there's no  
> way you're going to get any NCQ support on that slot.
>
> I don't know why Lenovo would do that, as it would kind of cripple SATA  
> drives in that slot, but hardware people do some bizarre things 
> sometimes..

I have to agree with Robert.  If you look at the ich8 data sheet
(313056-003), the mobile version has 3 ATA ports and 1 IDE port "that
can be electrically isolated".  See pages 41, 43, and 50-51.  on page 41,
it says the IDE port has "Tri-state modes to enable swap bay".

So I don't blame Lenovo for hooking up the Ultrabay slot using the IDE
port.  They were pretty much told to do it.
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