Re: 2.6.16-rc1-mm2 pata driver confusion

["Randy.Dunlap" <rdunlap@xenotime.net>]

On Fri, 3 Feb 2006, Ed Sweetman wrote:

>
> Still using mm kernels here, now on 2.6.16-rc1-mm5.   Still no atapi
> device detection - much less function - when using the libata pata amd
> driver for the nvidia Nforce4 chipset.   I tried, libata.atapi_enabled=1
> and just atapi_enabled=1 in the boot args and nothing was mentioned
> about atapi devices in dmesg.
>
> Is it a known issue with the pata libata drivers that atapi isn't
> working yet? ...  all i've seen is people with sata atapi devices
> chiming in.

Agreeing with your paragraph above.  I tested my SATA ATAPI CD/DVD
drive with libata/PATA (ata_piix controller driver) and could not
see the CD/DVD drive.

> >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.
> >>
> >>
> >
> >And this is with using only ATA (libata) drivers in drivers/scsi/
> >and not ATA drivers in drivers/ide/, right?
> >
> >Hm.  I guess we treat this as a bug report for NV ATA/ATAPI then.
> >
> >I just tested my system with a Plextor PX-712SA drive plus
> >booting with libata.atapi_enabled=1 and the driver (not nv)
> >sees the ATAPI drive and can read it.
> >
> >
> >
>  >Indeed, this is with only libata.  I had scsi disk driver and cdrom
>  >driver compiled in as well, because i assumed that the "low level"
>  >libata drivers required those scsi interfaces to access the disks and
>  >atapi devices that are found by libata.  ide isn't even compiled in.
>  >
>  >Like i said, i booted with libata.atapi_enabled=1 and that produced
>  >nothing about cdroms/atapi devices and then I simply set the variable
>  >to 1 in source and recompiled and booted and same problem.
>
>  >my board is an Asus A8N-E and my plextor is on the PATA controller, not
>  >the SATA like yours.  Perhaps mine would work too if it was sata, but
>  >it appears that the pata driver has no provisions for atapi devices >yet.
>
>
>

-- 
~Randy
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