linux-kernel - Re: 2.6.18-rc7-git1: AHCI not seeing devices on ICH8 mobo (DG965RY)

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Message-ID: <20060919044913.GD569@curie-int.orbis-terrarum.net>
Date:	Mon, 18 Sep 2006 21:49:13 -0700
From:	"Robin H. Johnson" <robbat2@...too.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Tejun Heo <htejun@...il.com>,
	"Robin H. Johnson" <robbat2@...too.org>,
	linux-kernel@...r.kernel.org,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: 2.6.18-rc7-git1: AHCI not seeing devices on ICH8 mobo (DG965RY)

On Mon, Sep 18, 2006 at 11:53:39PM -0400, Jeff Garzik wrote:
> We can't really know which controllers have a non-linear port mapping, 
> because that is dependent on both the silicon and whether or not the 
> chip is connected to port X[0-31].  The BIOS knows this, of course :)
I noticed that in my case, when the wrong ioports were probed (base +
port_idx*offset) for port_idx being 2/3 - all of the return values were
zero, instead of the expected values.

You could probably use this to detect cases where PI claims a port is
not present, but it really is.

-- 
Robin Hugh Johnson
E-Mail     : robbat2@...too.org
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

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