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

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Date:	Thu, 14 Apr 2011 14:25:31 -0700
From:	Hugh Dickins <hughd@...gle.com>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	kevin diggs <diggskevin38@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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 2:02 AM, Michel Dänzer <michel@...nzer.net> wrote:
> On Mit, 2011-04-13 at 18:43 -0500, kevin diggs wrote:
>>
>> On Wed, Apr 13, 2011 at 6:21 PM, Benjamin Herrenschmidt
>> <benh@...nel.crashing.org> wrote:
>> > On Wed, 2011-04-13 at 12:52 -0500, kevin diggs wrote:
>> >> > Actually I do get a crash in X later on... something in the radeon
>> >> DRM
>> >> > interrupt code is getting what looks like a NULL dereference. I'll
>> >> try
>> >> > to dig that one later on. I don't know if it's related to your
>> >> problem
>> >> > at all though.
>> >> >
>> >> In this context, what does 'crash' mean? The X thingy goes down? Or
>> >> the whole OS?
>> >
>> > Depends, with xmon enabled you get into xmon :-) Dunno if the oops is
>> > fatal but it could be.
>> >
>> > Cheers,
>> > Ben.
>> >
>> >
>>
>> As I think I have the same hardware as you (7,3, radeon 9600) If you
>> can tell me how to reproduce it maybe I can poke around a little.
>> Thus, at least temporarily, freeing you up for other stuff.
>>
>> I kinda need a break from fighting with GCC.
>
> FWIW, the problem Ben refers to might be fixed in current mainline by
> commit d87dfdbfc91c5e37288e7e8f7afdd992ba61a60d which reverts
> 69a07f0b117a40fcc1a479358d8e1f41793617f2 .

Mikael,

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.

Hugh
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