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    SubjectRe: [regression] 2.6.39-rc[1-3] fail to boot on G5 PowerMac
    On 2011-04-17 05:16, Hugh Dickins wrote:
    > On Thu, Apr 14, 2011 at 2:54 PM, Benjamin Herrenschmidt
    > <> wrote:
    >> On Thu, 2011-04-14 at 14:25 -0700, Hugh Dickins wrote:
    >>> Something worth trying: turn off CONFIG_IDE. That's what I need to
    >>> boot 2.6.39-rc[1-3] on PowerPC G5.
    >>> I know Jens has been fixing problems with IDE versus his plug/unplug
    >>> changes, but it's still not fixed for me in rc3.
    >>> In other mail
    >>> I see Linus recommending his post-rc3 commit 6631e635c65d
    >>> but I've not tried that myself yet.
    >> Well, the disk is SATA so it's CONFIG_ATA/libata, which works fine here,
    >> unless you somewhat replaced your CD-ROM with a legacy IDE disk :-) Or
    >> maybe the problem is related to the CD-ROM drive. There's a libata
    >> driver for it nowadays, so you can use PATA_MACIO instead of IDE_PMAC
    > Thanks for that, Ben: I remember you were brewing up such a driver,
    > but I missed when it actually went in. I can confirm that switching
    > off CONFIG_IDE and switching on CONFIG_PATA_MACIO and
    > CONFIG_BLK_DEV_SR now gives me a booting system with a working CD-ROM
    > (though I've not yet tried burning).
    > Whereas CONFIG_IDE=y with current git still does not boot: hangs for a
    > minute or three around the windfarm announcements, then an endless
    > splurge of hda error messages - sorry, I'm not being helpful, other
    > worries...

    It's the media event notification that goes crazy. Try and comment out
    this line:

    drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;

    in drivers/ide/ide-cd.c:cdrom_saw_media_change() and see if it boots.

    Jens Axboe

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