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

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Date:	Fri, 30 May 2008 13:19:27 +0900
From:	Tejun Heo <htejun@...il.com>
To:	"Hemmann, Volker Armin" <volker.armin.hemmann@...clausthal.de>
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

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.

> but:
> [14315325.624510] ahci 0000:00:0a.0: AHCI 0001.0100 32 slots 4 ports 3 Gbps 
> 0xf impl SATA mode
> [14315325.624559] ahci 0000:00:0a.0: flags: 64bit sntf led clo pmp pio
> 
> shouldn't controller and harddisks support turning on NCQ? The handbooks says 
> that NCQ is supported in AHCI mode and the harddisks doesn't seem to be 
> blacklisted.

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

Thanks.

-- 
tejun
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