linux-kernel - Re: problem booting linux with qemu-system-arm -M spitz

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Message-ID: <CAAQYJAv+rUiv5=qnL74WR9gFzv84SCwPcTNRcJcMcR8+pf75BQ@mail.gmail.com>
Date:	Wed, 18 Sep 2013 15:51:03 +0200
From:	Andrea Adami <andrea.adami@...il.com>
To:	Waldemar Brodkorb <wbx@...nadk.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: problem booting linux with qemu-system-arm -M spitz

On Wed, Sep 18, 2013 at 12:27 PM, Waldemar Brodkorb <wbx@...nadk.org> wrote:
> Hi Kernel hackers,
>
> I am trying to run Linux on Qemu/arm emulator with machine type
> spitz. In the past this worked fine.
> Now with Linux version 3.9.11 it does not boot anymore.
> (blank screen, no kernel messages)
>
> I used git bisect to find the commit, which breaks the boot:
> commit 4e8ee7de227e3ab9a72040b448ad728c5428a042
> Author: Will Deacon <will.deacon@....com>
> Date:   Wed Nov 23 12:26:25 2011 +0000
>
> I am using Qemu 1.6.0 on a Debian/x86_64 host.
>
> Any help would be appreciated.
>
> Thanks in advance
>  Waldemar
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

On real hardware I see the same breakage after 3.2.
Marko diagnosed it and there is a pending patch:

http://lists.infradead.org/pipermail/linux-arm-kernel/2013-September/198444.html

There is indeed some MMU-related issue.
Probably the function could be called elsewhere during machine init
but I'm not so high in the food chain to dare to touch arm boot code
;)

Regards

Andrea
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