[Xen-devel] Re: [Qemu-devel] [PATCH 06/11] exec.c: refactor cpu_physical_memory_map

[Peter Maydell <peter.maydell@xxxxxxxxxx>]

On 23 June 2011 18:56, Stefano Stabellini
<stefano.stabellini@xxxxxxxxxxxxx> wrote:
> Thanks for the detailed explanation of the problem, I think I understand
> what I have to do to fix.
> However I would like to have a repro of the bug before sending any
> patches, so that I am sure that the solution works correctly.
> However I am not very familiar with ARM emulation in Qemu: could you
> please let me know which target I have to compile, which machine I have
> to emulate and what other steps do I have to take in order to see this
> issue?

You'll need this not-yet-applied patch which adds cp15 perf reg support:
 http://patchwork.ozlabs.org/patch/92423/
I've temporarily put a test kernel and initrd here:
http://people.linaro.org/~pmaydell/linaro-20110228.tar.gz

configure qemu with --target-list=arm-softmmu
and then you can run:

./arm-softmmu/qemu-system-arm -kernel
linaro-20110228/vmlinuz-2.6.37-1003-linaro-vexpress -initrd
linaro-20110228/initrd.img-2.6.37-1003-linaro-vexpress  -M vexpress-a9
-cpu cortex-a9 -serial stdio -m 1024  -append 'root=/dev/mmcblk0p2 rw
mem=1024M raid=noautodetect console=ttyAMA0,38400n8 rootwait
vmalloc=256MB devtmpfs.mount=0'

At the moment this aborts when the kernel tries to initialise the
display; if you fix the problem it ought to display a penguin on
the graphics window (although it will drop you into an initramfs
prompt because you don't have a root filesystem sd card image).

-- PMM

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