Linux ARM SMP kernel for qemu -- jiffies not updated

Kevin Pouget kevin.pouget at
Mon Jan 24 03:34:06 EST 2011

thanks for your answers,

[it seems that] the problem was actually related to the version of
Qemu, v0.12.5 never triggered the jiffies update, as described below
for the record, whereas v0.13 is okay !




> Program received signal SIGINT, Interrupt.
> calibrate_delay () at /home/kevin/travail/srcs/linux-2.6.38-rc2/init/calibrate.c:149
> 149				while (ticks == jiffies)
> 150					/* nothing */;

jiffies are not updated, and the kernel never goes any further ...
(the second CPU is waiting for an interrup --WFI-- before starting)

On Sun, Jan 23, 2011 at 6:44 AM, Rabin Vincent <rabin at> wrote:
> On Fri, Jan 21, 2011 at 20:47, Kevin Pouget <kevin.pouget at> wrote:
>> do you know if it's feasible to compile a Linux kernel to be run by a
>> Qemu SMP ARM machine? after so many hours of tries, I can say that any
>> version of the kernel, any Qemu machine would be okay, provided that
>> the SMP capability is set, and the kernel boots !
> Try the kernel from latest git, QEMU from latest git, and the attached
> .config.
> The .config is just realview_smp-defconfig with:
>  - PB11 and ARMv6 disabled
>  - PBX A9 and ARMv7 enabled
> Initramfs support is also enabled.  You can boot it with this line (you'll
> need an initramfs or initrd to get to userspace):
> qemu-system-arm -kernel arch/arm/boot/uImage -nographic \
>                -append "earlyprintk console=ttyAMA0 mem=128M debug" \
>                -M realview-pbx-a9 -m 128M -initrd ~/kernel/root -smp 2

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