RE: AHCI - remove probing of ata2

["Paul Rolland" <rol@as2917.net>]

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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