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From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>, linux-ide@vger.kernel.org
Subject: Re: [PATCH] ahci: Add Intel Emmitsburg PCH RAID PCI IDs
Date: Mon, 23 Nov 2020 14:28:20 +0200	[thread overview]
Message-ID: <20201123122820.GD2495@lahna.fi.intel.com> (raw)
In-Reply-To: <20201123113801.GA15759@infradead.org>

On Mon, Nov 23, 2020 at 11:38:01AM +0000, Christoph Hellwig wrote:
> The point is: these AHCI controllers do not support RAID in form
> despite the confusing naming.

Are you sure?

I looked at the Emmitsburg data sheet and it actually seems to support
some sort of RAID but it requires some special Rapid Storage Technology
[1] drivers from Intel. Probably the idea is that when in "RAID mode"
the thing, as AHCI spec says, does not announce itself to be AHCI
compliant which makes Windows inbox AHCI driver to not to load, and this
allows the Intel propriatery driver to load that then takes advantage of
this somehow.

I'm not too familiar with these technologies here so I may be missing
something.

[1] https://www.intel.com/content/www/us/en/architecture-and-technology/rapid-storage-technology.html

  reply	other threads:[~2020-11-23 13:30 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 10:43 [PATCH] ahci: Add Intel Emmitsburg PCH RAID PCI IDs Mika Westerberg
2020-11-19 16:50 ` Christoph Hellwig
2020-11-20 10:53   ` Mika Westerberg
2020-11-23 10:09     ` Christoph Hellwig
2020-11-23 11:26       ` Mika Westerberg
2020-11-23 11:38         ` Christoph Hellwig
2020-11-23 12:28           ` Mika Westerberg [this message]
2020-11-23 12:51             ` Christoph Hellwig
2020-11-25 14:44               ` Mika Westerberg
2022-04-02  0:43           ` Williams, Dan J
2020-12-16 12:34 ` Mika Westerberg

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