On 04/08/2013 09:26 AM, Gilles Chanteperdrix wrote:
> On 04/07/2013 09:52 PM, Thierry Bultel wrote:
>
>> Le 07/04/2013 17:06, Gilles Chanteperdrix a écrit :
>>> On 04/07/2013 11:31 AM, Thierry Bultel wrote:
>>>
>>>> Hi,
>>>>
>>>> I am using a vanilla 3.5.7 kernel in qemu-1.4.0
>>>> The base defconfig is the vexpress.
>>>>
>>>> I want to use xenomai-2.6.2.1 with it.
>>>>
>>>> The non-patched kernel boots fine, the patched one doesnot, there is
>>>> nothing on the console,
>>>> the boot logo does not comeand Qemu then takes 100% CPU.
>>>>
>>>> Here is my command line
>>>> ./qemu-1.4.0/arm-softmmu/qemu-system-arm -M vexpress-a9 -kernel
>>>> ./Buildroot/output.linaro.vexpress-a9/build/linux-3.5.7/arch/arm/boot/uImage
>>>> -append "console=ttyAMA0" -m 1024M -serial stdio
>>>>
>>>> Any ideas ? May I have missed something ?
>>>
>>>
>>> Well, vexpress is not in the list of machines supported by Xenomai. So,
>>> someone needs to port the I-pipe kernel to it.
>>>
>>>
>>
>> Hi Gilles,
>>
>> We already talked about the vexpress, it was at the beginning of the
>> rtcan discussion.
>> It used to work (and pretty well), my configuration was:
>>
>> linux-3.2.21+ipipe-core-3.2.21-arm-1.patch
>>
>> and I have just successfully tested
>>
>> linux-3.2.21+ipipe-core-3.2.21-arm-4.patch
>> as well.
>>
>> There is likely not much missing for having it working on the 3.5.7
>> kernel. I am taking a look.
>
>
> Someone did the port of the I-pipe patch to vexpress (but did not
> contribute it), the difference between vexpress and other cortex A9
> based SOCs is that it does not support global timers, the one used by
> the I-pipe patch as clocksource. The difference between 3.2 and later
> patches is probably that later patches unconditionally use the global
> timer. The fix around this is to add code do detect the cortex a9
> revision and do not register the global timers when the revision is too old.
>
Found the mail: "I just got a reply from ARM support and obviously I
missed the thing that my release of Cortex-A9 does NOT have a global
timer (they added it from r1p0, mine is r0p1)."
You know what version your processor is by reading the first few lines
printed by the kernel:
CPU: ARMv7 Processor [411fc092] revision 2 (ARMv7), cr=10c53c7d
41 is used by all cores from ARM
fc09 represents the cortex a9
The remaining 1 and 2 mean that this cortex a9 is an r1p2
--
Gilles.
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