Re: 2.6.16-rc1-mm2 pata driver confusion

[Ed Sweetman <safemode@comcast.net>]

Randy.Dunlap wrote:

> On Tue, 24 Jan 2006, Ed Sweetman wrote:
>
>  
>
> > Randy.Dunlap wrote:
> >
> >    
> >
> > > On Tue, 24 Jan 2006, Ed Sweetman wrote:
> > >
> > >      
> > >
> > > > Alan Cox wrote:
> > > >
> > > >        
> > > >
> > > > > On Maw, 2006-01-24 at 01:43 -0500, Ed Sweetman wrote:
> > > > >
> > > > >
> > > > >          
> > > > >
> > > > > > problem.  The problem is that there appears to be two nvidia/amd ata
> > > > > > drivers and I'm unsure which I should try using, if i compile both in,
> > > > > > which get loaded first (i assume scsi is second to ide) and if i want my
> > > > > > pata disks loaded under the new libata drivers, will my cdrom work under
> > > > > > them too, or do i still need some sort of regular ide drivers loaded
> > > > > > just for cdrom (to use native ata mode for recording access).
> > > > > >
> > > > > >
> > > > > >            
> > > > > The goal of the drivers/scsi/pata_* drivers is to replace drivers/ide in
> > > > > its entirity with code using the newer and cleaner libata logic. There
> > > > > is still much to do but my SIL680, SiS, Intel MPIIX, AMD and VIA boxes
> > > > > are using libata and the additional patch patches still queued
> > > > >
> > > > >
> > > > >          
> > > > >
> > > > > > 1.  Atapi is most definitely not supported by libata, right now.
> > > > > >
> > > > > >
> > > > > >            
> > > > > It works in the -mm tree.
> > > > >
> > > > >
> > > > >          
> > > > Intriguing, when I had no ide chipset compiled in kernel, only libata
> > > > drivers, I got no mention at all about my dvd writer.  I even had the
> > > > scsi cd driver installed and generic devices, still nothing seemed to
> > > > initialize the dvd drive.  It detected the second pata bus but no
> > > > devices attached to it.
> > > >
> > > > this is using the kernel mentioned in the subject header.
> > > > 2.6.16-rc1-mm2.  using the amd/nvidia drivers for pata and sata.
> > > >
> > > > Is there anything i can do to give more info to the list to figure out
> > > > why my atapi writer is being ignored by pata even when there are no ide
> > > > drivers loaded?
> > > >
> > > >        
> > > Currently you need to use libata.atapi_enabled=1
> > > (assuming that libata is in the kernel image, not a loadable module).
> > >
> > > I just built/tested this also, working for me as well.
> > > (hard drives, not ATAPI)
> > >
> > >
> > >      
> > I assume libata.atapi_enabled=1 is a boot arg, not some structure member
> > in the source for the pata driver that i need to set to 1, correct?
> >    
>
> Yes, it's a kernel boot option if libata is in the kernel image.
> If libata is a loadable module, just use something like
> 	modprobe libata atapi_enabled=1
>
>  
>
> > And you just built and tested it, how did you test if the atapi argument
> > worked when you then say "not ATAPI" as something you tested?
> >    
>
> Sorry, I mean that I built and booted a kernel with libata/PATA
> hard drive (vs. legacy drivers/ide/ PATA support).  I have not
> tested ATAPI at all and didn't mean to imply that I had.
>
> I reported on libata.atapi_enabled=1 based on documentation
> and other emails that I have read.
>
>  
>
> > In any case, i'll try out libata.atapi_enabled=1 and see if it detects
> > the dvd drive.
> >    
>
> HTH.  Please continue to post any questions or problems.
>  

I Rebooted several times, both setting the option in the kernel boot 
args and editing the source to have it set by default.  No atapi devices 
are found/mentioned or even described as not found in dmesg/bootup.   So 
apparently, on my chipset, the amd/nvidia pata driver is not detecting 
atapi devices.

0000:00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2)
0000:00:07.0 IDE interface: nVidia Corporation CK804 Serial ATA 
Controller (rev f3)
0000:00:08.0 IDE interface: nVidia Corporation CK804 Serial ATA 
Controller (rev f3)

0000:00:06.0 IDE interface: nVidia Corporation CK804 IDE (rev f2) 
(prog-if 8a [Master SecP PriP])
       Subsystem: Unknown device f043:815a
       Flags: bus master, 66MHz, fast devsel, latency 0
       I/O ports at f000 [size=16]
       Capabilities: [44] Power Management version 2



the atapi device in question is a plextor px-712A, it's the only device 
on the secondary channel.



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