linux-kernel - Re: commit f6be75d03c88 broke qemu-system-mips64.

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Date:	Tue, 07 Sep 2010 09:29:28 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Rob Landley <rob@...dley.net>
CC:	linux-kernel@...r.kernel.org, ralf@...ux-mips.org
Subject: Re: commit f6be75d03c88 broke qemu-system-mips64.

On 09/04/2010 03:54 PM, Rob Landley wrote:
> linux-2.6.33 booted mips64 to a shell prompt, and 2.6.34 didn't.  The above
> commit is the one that broke it, and if you revert it the result boots again.
>
> To try it yourself, download this mips64 system image:
>
>    http://impactlinux.com/aboriginal/downloads/binaries/system-image-mips64.tar.bz2
>
> Extract it, cd into it, and "./run-emulator.sh".
>
> You'll need QEMU installed.  Note that Ubuntu's qemu package is actually
> kqemu, and doesn't support any non-x86 targets.  You need to install
> "qemu-kvm-extras" to get _actual_ qemu.  I don't know why they broke this.
>
> Once you've confirmed it used to work, replace the zImage-mips64 file with a
> vmlinux built using the attached .config and ./run-emulator.sh again.  If you
> build f6be75d03c88 it fails, but f6be75d03c88^1 works.  If you build 2.6.35
> but revert the f6be75d03c88 patch (all one line of it), it works.  If you don't
> revert it, v2.6.35 is still broken.
>
> Rob

Has anybody tried it on a real 64-bit Malta?  Perhaps the emulator is 
broken.

Rob, did you try to debug it at all?  Where is it going off into the weeds?

David Daney
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