Re: [Qemu-devel] [PATCH 2/2] Drop obsolete nographic timer

[Jan Kiszka <jan.kiszka@web.de>]

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On 2012-03-15 19:12, Marek Vasut wrote:
> Dear Marek Vasut,
> 
>> Dear Jan Kiszka,
>>
>>> On 2012-03-10 07:19, Marek Vasut wrote:
>>>> Dear Jan Kiszka,
>>>>
>>>>> We flush coalesced MMIO in the device models now, and VNC - for which
>>>>> this was once introduced - is also fine without it as it has its own
>>>>> refresh timer.
>>>>>
>>>>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>>>>> ---
>>>>>
>>>>>  vl.c |   13 -------------
>>>>>  1 files changed, 0 insertions(+), 13 deletions(-)
>>>>
>>>> This patch seems to break QEMU/PXA emulation for me on the ZipitZ2
>>>> platform. The serial console became very slow, but only when I type
>>>> something in. The output from the device to the console is ok. After
>>>> reverting this particular one, the console behaves normally.
>>>
>>> Removing that timer removal likely just revealed some formerly hidden
>>> bug. Can you share the command line used for starting and some test
>>> image?
>>>
>>> Jan
>>
>> qemu-system-arm -M z2 -pflash flash.img -serial null -serial null -serial
>> stdio -display none
>>
>> flash.img attached (XZ-ed)
>>
> 
> Bump?

I had a brief look: The guest is apparently polling the uart, IRQ
delivery is disabled. But it also receives no timer ticks. I haven't
checked how it progresses, maybe there is some loop counter used.

What's the origin of this test image? Have you checked it works properly
on real silicon? I do not know how this platform looks like in reality,
how it should behave and should be programmed (by the guest), so I
really can't compare and analyze, sorry.

Jan


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