linux-kernel - Re: 2.6.24.X: SATA/AHCI related boot delay.

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Message-Id: <200805301243.39751.volker.armin.hemmann@tu-clausthal.de>
Date:	Fri, 30 May 2008 12:43:39 +0200
From:	"Hemmann, Volker Armin" <volker.armin.hemmann@...clausthal.de>
To:	Tejun Heo <htejun@...il.com>
Cc:	Peer Chen <pchen@...dia.com>, Jeff Garzik <jeff@...zik.org>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Kuan Luo <kluo@...dia.com>
Subject: Re: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3

On Freitag, 30. Mai 2008, Tejun Heo wrote:
> Hello,
>
> Hemmann, Volker Armin wrote:
> > -AHCI+nomsi: boots fine. Works fine. But: I still can not enable ncq
> > -AHCI+msi: the usual. No harddisks found, waiting for the timeouts, then
> > kernel panic because of missing root.
> >
> > -NON-RAID/IDE+msi: works fine. No delays. No NCQ (not surprising since
> > mobos handbook says that AHCI mode is required).
> > -NON-RAID/IDE+nomsi: see above.
>
> So, sans NCQ, the only remaining issue is MSI, right?  Peer Chen, please
> lemme know which controllers are affected by this MSI problem and where
> the problem lies.

this is correct.

> The controller is not reporting NCQ capability in its cap register
> (flags: line contains ncq if the controller is), so NCQ is not enabled.

ah, I thought all AHCI chipsets support NCQ (and the board's handbook lists it 
as feature) thanks for the explanation.

Glück Auf,
Volker
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