From: Tim Small <tim@seoss.co.uk>
To: Marc MERLIN <marc@merlins.org>
Cc: linux-ide@vger.kernel.org
Subject: Re: Does Intel Sandy Bridge MB Sata support port multipliers?
Date: Mon, 20 Jun 2011 10:43:30 +0100 [thread overview]
Message-ID: <4DFF1642.4040404@seoss.co.uk> (raw)
In-Reply-To: <20110620045138.GB21438@merlins.org>
On 20/06/11 05:51, Marc MERLIN wrote:
> I upgraded the system and was hoping to use onboard sata (it's a Sandy
> Bridge lga1155).
>
Which chipset? Perhaps lspci of the ahci controller device?
> When I plug my PMP into that, the other drives are not detected.
>
> Where do I find the list of SATA drivers that support PMP.
>
It's dependant on the hardware and the driver...
https://ata.wiki.kernel.org/index.php/SATA_hardware_features
> Are newer intel MBs with onboard SATA supposed to work?
>
I believe Intel limit PMP support to certain chipsets and versions (for
"product differentiation" marketing reasons). I have an H67 motherboard
here, and PMP is supported on all 6 ports, but only in "CBS" mode (i.e.
poor performance if you try to access two drives concurrently).
I'm currently wrestling with PMP support on Marvell AHCI devices....
It seems to work on an 88SE9125 with recent firmware, but not working
with an 88SE9123 with older firmware. I'm planning on doing further
debug later today.
> ahci 0000:00:1f.2: flags: 64bit ncq sntf pm led clo pio slum part ems apst
>
no "pmp" in that flag list :-(
Tim.
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next prev parent reply other threads:[~2011-06-20 9:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 4:51 Does Intel Sandy Bridge MB Sata support port multipliers? Marc MERLIN
2011-06-20 9:43 ` Tim Small [this message]
2011-06-20 14:25 ` Marc MERLIN
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