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. -- Gilles. _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
