Le 08/04/2013 22:55, Gilles Chanteperdrix a écrit :
On 04/08/2013 09:13 PM, Thierry Bultel wrote:
Le 08/04/2013 10:05, Gilles Chanteperdrix a écrit :
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
Many thanks,
I confirm that this fix makes vexpress boot in qemu:
Merged thanks. I believe you should keep the calculation of
twd_timer_rate, otherwise the twd timers will not be calibratd
correctly. The following:
http://git.xenomai.org/?p=ipipe-gch.git;a=commitdiff;h=9a776ad3c41fa1aef1b60d0cce5de3ca9dece42d;hp=82b6948fed3581e65bcce64b91b16140686263a7
Works for me.
It works on what platform ? It does not in qemu. The boot hangs the same
way.
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