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Date:      Tue, 16 Jan 2001 17:07:43 +0100
From:      Michel Talon <michel@lpthe.jussieu.fr>
To:        FBSD-STABLE <freebsd-stable@FreeBSD.ORG>
Subject:   Re: Strange device probe behavior
Message-ID:  <20010116170743.A1189@lpthe.jussieu.fr>
In-Reply-To: <20010115210358.A693@poeza.iconnect.co.ke>
References:  <20010114122845.A400@poeza.iconnect.co.ke> <Pine.BSF.4.31.0101141105140.47113-100000@cj409896-a.reston1.va.home.com> <20010115210358.A693@poeza.iconnect.co.ke>

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On Mon, Jan 15, 2001 at 09:03:58PM +0300, Odhiambo Washington wrote:
> * David Wagner <dawagner@vt.edu> [20010114 19:35]: writing on the subject 'Re: Strange device probe behavior'
> David> On Sun, 14 Jan 2001, Odhiambo Washington wrote:
> David> 
> David> > atapci0: <Intel PIIX4 ATA33 controller> port 0x1860-0x186f at device
> David> > 4.1 on pci0
> David> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> David> > This is where 15 or so seconds lapse before the probe continues!!
> David> 
> David> Well, if it makes you feel any better, my system does this too.  It has:
> David> 
> David> atapci0: <Intel PIIX4 ATA33 controller> port 0x18a0-0x18af at device 7.1
> David> on pci0
> David> 
> David> Mine's a Gateway system I bought a couple years ago and recently turned
> David> into a FreeBSD box.  I've never noticed any problems with it -- once the
> David> probe continues everything seems to be fine.  I certainly have no idea
> David> _why_ it does it, but at least it doesn't seem to be cause for panic. :)
> 
> Well, and does your system end up detecting ata1 (or it doesn't exist in
> yours, maybe) ? Someone suspects that the 'momentary stall' at that
> stage could be s'thing to do with probe for ata1 (a couple others have
> it - I have it too on a clone that I run and no stall) but even a kernel
> compile without ata1 still yields no difference.

I have also this stall problem on a 3 years old machine using an Asus P2L97
mobo. It has an IDE disk on first ata channel and an atapi cdrom on the second
one, plus a SCSI disk. There is a ~ 30s delay at boot probing the ata
controller. This never occured under 3.* and began with 4.0 I have emailed the
info to S.S. but the "bug" was never solved. Here are the relevant dmesg
lines:

atapci0: <Intel PIIX4 ATA33 controller> port 0xd800-0xd80f at device 4.1 on
pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0

ad0: 1222MB <QUANTUM FIREBALL1280A> [2484/16/63] at ata0-master WDMA2
acd0: CDROM <CD-56E> at ata1-master using PIO3

There are also some ata resetting messages in the logs but not much and they
seem innocuous.

-- 
Michel Talon


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