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    SubjectRe: [regression] 2.6.39-rc[1-3] fail to boot on G5 PowerMac
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    On Sun, Apr 17, 2011 at 12:00 AM, Jens Axboe <jaxboe@fusionio.com> wrote:
    > On 2011-04-17 05:16, Hugh Dickins wrote:
    >> On Thu, Apr 14, 2011 at 2:54 PM, Benjamin Herrenschmidt
    >> <benh@kernel.crashing.org> 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 http://lkml.org/lkml/2011/4/14/614
    >>>> 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.

    Yes, that also boots, with a working CD-ROM: thanks.

    Hugh
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