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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: Wed, 25 Nov 2020 16:44:35 +0200	[thread overview]
Message-ID: <20201125144435.GC5246@lahna.fi.intel.com> (raw)
In-Reply-To: <20201123125114.GA4264@infradead.org>

On Mon, Nov 23, 2020 at 12:51:14PM +0000, Christoph Hellwig wrote:
> On Mon, Nov 23, 2020 at 02:28:20PM +0200, Mika Westerberg wrote:
> > 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.
> 
> Yes, and that is purely (badly implemented) software RAID.

Sorry for the delay. I'm trying to find the AHCI owners at Intel and
forward this request to them. I would not hold my breath though that
anything will change but I'll try :)

Even if that would change, Emmitsburg still needs these PCI IDs so hope
this patch if fine for you.

  reply	other threads:[~2020-11-25 14:44 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
2020-11-23 12:51             ` Christoph Hellwig
2020-11-25 14:44               ` Mika Westerberg [this message]
2022-04-02  0:43           ` Williams, Dan J
2020-12-16 12:34 ` Mika Westerberg

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