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Date: Mon, 21 Aug 2006 14:17:08 +0200
From: Olaf Hering <olaf@aepfle.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: booting with BootX corrupts memory
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Cc: linuxppc-dev@ozlabs.org, Niels Kristian Bech Jensen <nkbj@mail.tele.dk>
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On Fri, Aug 18, 2006 at 09:01:13AM +0200, Olaf Hering wrote:

> On Fri, Aug 18, 2006 at 02:02:12PM +1000, Benjamin Herrenschmidt wrote:
> > On Wed, 2006-08-09 at 06:00 +0200, Niels Kristian Bech Jensen wrote:
> > >  On Tue, Aug  1, Olaf Hering wrote:
> > > 
> > > > Booting an old Mac with BootX corrupts memory, the kernel seldom gets
> > > > into init. Even the built-in initramfs archive gets corrupted. So far I
> > > > havent figured out where the corruption starts. The only data point so
> > > > far is that a passed initrd gets overwritten with stuff that looks like
> > > > part of the device-tree after the call to free_area_init_node() from
> > > > paging_init(). Perhaps the virtual/real address mapping isnt handled
> > > > correctly.
> > > 
> > > > This is broken since at least 2.6.15, 2.6.14 dies very early, 2.6.13 was
> > > > still ok.
> > > 
> > > > Symptoms differ, depending on used .config and wether an initrd is passed.
> > > 
> > > I think I've been hit by this bug on my beige G3 running Ubuntu Edgy.
> > > 
> > > When booting with initrd the boot process stops before any kernel output (CONFIG_BOOTX_TEXT is not enabled).
> > > Booting without initrd works fine - at least until it cannot find the root filesystem driver. ;-)
> > 
> > Does this patch helps ?
> 
> No, now I dont even get console= output on serial console.

It doesnt work on a 7200, butit works on a beige G3.
But later it locks up in 'PM: Adding info for No Bus:target0:0',
after mesh init. This one is likely unrelated.