On Wed, 2011-01-12 at 11:54 -0500, Mike Edenfield wrote:
> On 1/12/2011 11:11 AM, Michael Sullivan wrote:
> > OK, for several years I have not had a /dev/cdrom. My workstation has
> > an internal cd-rom drive, which gets mapped to /dev/hda, and an external
> > DVD+R drive, which is mapped to /dev/sr0. When I look
> > at /etc/udev/rules.d/70-persistent-cd.rules I see:
>
> I just went through this exact same problem, and it turned out that
> having both the old ATA drivers and the new libata drivers in my kernel
> at the same time was the root of the problem. I had multiple drivers
> fighting for the same device, and it confused udev for some reason. The
> end result was, udev never picked up that the IDE drive was actually a
> CD-ROM, so it never ran the udev rules to automatically regenerated
> 70-persistent-cd.rules.
>
> The existing rules you have don't work because the ID_PATH isn't valid:
>
> ENV{ID_PATH}=="pci-0000:00:1f.1-ide-0:0"
>
> The "-ide-0:0" part no longer shows up when you get the udev ID_PATH for
> a device using the old ATA drivers, so there are no matching udev rules
> to create the symlinks.
>
> I fixed it by switching over completely to libata, like this:
>
> 1. Delete the 70-persistent-cd.rules file from /etc/udev. (If
> everything is working correctly, udev will regenerate this file from
> scratch the next time you start it.)
>
> 2. In your kernel config, under Device Drivers --->
> * Make sure that ATA/ATAPI/MFM/RLL support is /not/ selected.
> * Enable Serial ATA and Parallel ATA
> * Under Serial ATA and Paralle ATA --->
> ** Enable ATA SFF support
> ** Below that, enable ATA BMDMA support[1]
> ** Below that, enable whatever IDE chipset you have
>
> 3. Back under Device Drivers --->
> * Under SCSI device support --->
> ** Enable SCSI disk support
> ** Enable SCSI CDROM support
> ** /Do not/ enable SCSI Generic support[2]
>
> Build/install/reboot and you should now see your two CD drives appearing
> as sr0 and sr1. udev should now pick them both up, and write a new
> 70-persistent-cd.rules file, with the IDE drive having a different
> ID_PATH, something like:
>
> ENV{ID_PATH}=="pci-0000:00:1f.1-scsi-0:0:0:0"
>
> And you should now get your symlinks.
>
> [1] BMDMA is the controller type in all of the machines I have, and
> seems to be the standard for most personal desktop/laptop/etc machines.
> If you know differently, of course, pick the correct SFF controller.
>
> [2] The SCSI generic driver has a habit of grabbing my other SCSI
> devices and assigning them to sg0/sg1/sg2/etc; this seemed to prevent
> udev from picking up that they were CD drives. If you need SCSI Generic
> for some reason, I'd suggest making it a module.
>
> --Mike
>
I was still running linux-2.6.30-gentoo-r8. I didn't even HAVE an
option for ATA SFF support. I'm going to build a v2.6.36-gentoo-r5
kernel and pray that my ivtv stuff still works...
