Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: Regression in 5.1.0-rc2: PowerBook G4 Aluminum fails to boot -
 bisected to commit 0df977eafc792
To:     Christophe Leroy <christophe.leroy@c-s.fr>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        ppc-dev <linuxppc-dev@lists.ozlabs.org>
Cc:     LKML <linux-kernel@vger.kernel.org>
References: <acc2d5a5-2fd4-4367-c8ef-497da951c208@lwfinger.net>
 <ee247f37-8889-934c-571c-01c43fc31071@c-s.fr>
From:   Larry Finger <Larry.Finger@lwfinger.net>
Message-ID: <af5603cb-5726-213a-adba-164c635d1a66@lwfinger.net>
Date:   Mon, 25 Mar 2019 10:54:25 -0500
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.5.2
MIME-Version: 1.0
In-Reply-To: <ee247f37-8889-934c-571c-01c43fc31071@c-s.fr>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 3/25/19 1:53 AM, Christophe Leroy wrote:
> 
> 
> Le 25/03/2019 à 01:49, Larry Finger a écrit :
>> A build of kernel 5.1.0-rc2 resulted in a failure to boot on my PowerBook G4 
>> Aluminum. The bootstrap loads the initial kernel and issues the appropriate 
>> start, but the machine hangs at that point.
> 
> Can you please be more explicit ? What do you mean by "issues the appropriate 
> start" ? What is "that point" ? Any messages on the console ?

Sorry to be unclear. The bootstrap code prints a line saying "Booting Linux via 
__start() @ 0x00c00000" and then hangs.

Your idea of confusion between physical and virtual address sounds right. I am 
building a kernel with that patch applied now. As it seems to be going quickly, 
I should have the answer fairly quickly.

Thanks,

Larry