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SubjectRE: AHCI - remove probing of ata2
Date
Hello Tejun,

I've tested your patch yesterday, but no luck, I can't find any difference
in the resulting boot log.

Please find attached an archive containing :
- dmesg.2.6.20-rc7 : full dmesg with stock kernel
- dmesg.patch : full dmesg with your patch included.

I've also added a lspci -vvv, a cat /proc/interrupts and a cat /proc/ioports
in case this could help.

Also, please note that libata is complaining :
ATA: abnormal status 0x7F on port 0x177
and later :
ATA: abnormal status 0x7F on port 0x9807

I don't know if this is important or not.

Sorry for the bad news,
Regards,
Paul

Paul Rolland, rol(at)as2917.net
ex-AS2917 Network administrator and Peering Coordinator

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> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Paul Rolland
> Sent: Monday, February 12, 2007 12:19 PM
> To: 'Tejun Heo'
> Cc: 'Alan'; 'Robert Hancock'; 'Linux Kernel Mailing List'
> Subject: RE: AHCI - remove probing of ata2
>
> Hello Tejun,
>
> > You have a Maxtor connected to that port, right? That's caused by
>
> Waoh, you are using crystal ball ? :) You are right, this is a Maxtor
> disk, 250 MB. If you want more details about this disk, I can send you
> a complete details.
>
> > firmware bug. Future kernels will consider that condition as
> > protocol
> > violation and blacklist the drive such that NCQ is not used
> on it. I
> > think it can be dangerous on rare corner/error cases but
> there hasn't
> > been any actual report of problems caused by that, so no need
> > to worry
> > about it too much. If it bothers you, you can turn NCQ off
> > using sysfs
> > node. Take a look at FAQ section of http://linux-ata.org
>
> I'm just slightly worried about that, and because all this libata
> stuff is quite "new", I prefer to report everything I can
> see, considering
> that I can test patches on this machine if people need me to do so.
> So, consider this machine as some kind of playground if you have
> some code you want someone to test.
>
> > Slightly OT, but it's generally a good idea to use LABELs to access
> > filesystems. With so many ports and EH dynamics including
> > hotplug, it's
> > much more difficult to keep device names persistent and
> remember them.
>
> Yes, that's what I should do, but I've never really like that stuff ;(
>
> > > So, 2.6.20-rc7 results are :
> > > - ata2 probing still very long and delaying boot a lot,
> >
> > That's sil4726's config device acting weird. When reset as
> a normal
> > device (not PMP device), sil4726 acts as a normal ATA
> device which is
> > used to configure how the chip behaves. Unfortunately, the
> emulation
> > seems to contain some flaws and cause lots of delays as
> you've seen.
> > I'm attaching a patch to clear TF before IDENTIFY which
> fixes similar
> > IDENTIFY failures on buggy ATAPI devices.
>
> OK, will try this tonite (I'm sorry, this is my home comp.,
> and I'm at the
> office right now - will tell you tomorrow).
>
> > > - Jmicron PATA still not working, and doesn't even detect
> > the DVD-ROM on
> > > the port.
> >
> > This problem is likely to be fixed by clearing TF before IDENTIFY.
> >
> > So, please test the attached patch and report the result.
>
> Will do, and will test more if you more that are to be tested !
>
> BTW, maybe OT, but what about setting a list of people willing to test
> patches together with their configurations so that they can be send
> patches related to their hardware ? That could be useful to
> people developing
> drivers...
>
> Regards,
> Paul
>
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