linux-kernel - Re: [regression] 2.6.39-rc[1-3] fail to boot on G5 PowerMac

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Date:	Sat, 16 Apr 2011 20:16:29 -0700
From:	Hugh Dickins <hughd@...gle.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	Jens Axboe <jaxboe@...ionio.com>,
	kevin diggs <diggskevin38@...il.com>,
	Michel Daenzer <michel@...nzer.net>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [regression] 2.6.39-rc[1-3] fail to boot on G5 PowerMac

On Thu, Apr 14, 2011 at 2:54 PM, Benjamin Herrenschmidt
<benh@...nel.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...

Hugh
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