Spurious IPIs on secondary cpu bringup with EXYNOS 4412

Spurious IPIs on secondary cpu bringup with EXYNOS 4412

[Matthew Leach]

Hi,

I applied the secondary CPU bringup patch [1] to mainline, however when
booting I get the following spurious IPIs after each core has booted:

[    0.050000] CPU1: Booted secondary processor
[    0.075000] CPU1: thread -1, cpu 1, socket 10, mpidr 80000a01
[    0.080000] CPU1: Unknown IPI message 0x1
[    0.090000] CPU2: Booted secondary processor
[    0.115000] CPU2: thread -1, cpu 2, socket 10, mpidr 80000a02
[    0.120000] CPU2: Unknown IPI message 0x1
[    0.130000] CPU3: Booted secondary processor
[    0.155000] CPU3: thread -1, cpu 3, socket 10, mpidr 80000a03
[    0.160000] CPU3: Unknown IPI message 0x1

Has anyone that has access to the documentation for the 4412 know what
this could be?

[1]: ARM: EXYNOS: Add support for secondary CPU bring-up on Exynos4412

---

Thanks,
Matt

Re: Spurious IPIs on secondary cpu bringup with EXYNOS 4412

[Kyungmin Park]

On 10/2/12, Matthew Leach <matthew@mattleach.net> wrote:
> Hi,
>
> I applied the secondary CPU bringup patch [1] to mainline, however when
> booting I get the following spurious IPIs after each core has booted:
>
> [    0.050000] CPU1: Booted secondary processor
> [    0.075000] CPU1: thread -1, cpu 1, socket 10, mpidr 80000a01
> [    0.080000] CPU1: Unknown IPI message 0x1
> [    0.090000] CPU2: Booted secondary processor
> [    0.115000] CPU2: thread -1, cpu 2, socket 10, mpidr 80000a02
> [    0.120000] CPU2: Unknown IPI message 0x1
> [    0.130000] CPU3: Booted secondary processor
> [    0.155000] CPU3: thread -1, cpu 3, socket 10, mpidr 80000a03
> [    0.160000] CPU3: Unknown IPI message 0x1
>
> Has anyone that has access to the documentation for the 4412 know what
> this could be?
It's known issue, you can find the patch at arm mailing list to solve issue.
IOW it's not exynos specific, but arm specific issue.

Thank you,
Kyungmin Park
>
> [1]: ARM: EXYNOS: Add support for secondary CPU bring-up on Exynos4412
>
> ---
>
> Thanks,
> Matt
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