SMP support for Raspberry Pi 2

[Rohini Kulkarni]

Hi,

How is the number of processors to be used for an application specified?
The used count minimum of that supported in hardware and that configured.
How to specify the latter?

Thanks.
On 29 Jul 2015 15:29, "Sebastian Huber" <sebastian.huber at embedded-brains.de>
wrote:

>
>
> On 29/07/15 11:52, Rohini Kulkarni wrote:
>
>>
>>
>> On Tue, Jul 28, 2015 at 12:24 PM, Sebastian Huber <
>> sebastian.huber at embedded-brains.de <mailto:
>> sebastian.huber at embedded-brains.de>> wrote:
>>
>>     Hello Rohini,
>>
>>     please use the devel list.
>>
>>     On 28/07/15 07:41, Rohini Kulkarni wrote:
>>
>>         Hi,
>>
>>         I wish to understand where the interprocessor interrupts are
>>         used during the boot process. During final initialization of
>>         SMP I can see
>>
>>         rtems_interrupt_handler_install(
>>               ARM_GIC_IRQ_SGI_0,
>>               "IPI",
>>               RTEMS_INTERRUPT_UNIQUE,
>>               bsp_inter_processor_interrupt,
>>               NULL
>>             );
>>
>>         Raspberry Pi 2 does not have the generic interrupt controller.
>>         Interrupt routing will have to be handled differently. So I
>>         wish to understand how/ where it is used. I suppose this might
>>         be the problem.
>>
>>
>>     Sorry, that the documentation is so scattered.  I think we should
>>     move everything into the CPU Architecture Supplement. It would be
>>     nice if you can help to improve the documentation since you have a
>>     different view point.
>>
>>     You must install the IPI during the system initialization. It is
>>     raised via the _CPU_SMP_Send_interrupt() function, for an example
>>     see arm-a9mpcore-smp.c.
>>
>> I could locate the function in  arm-a9mpcore-smp.c. but it would be
>> helpful if I can know where this being called from, a deeper call
>> hierarchy, so that I can ascertain this is a problem. I can see a
>> Send_messgae function call this. But don't know where the send message is
>> being called from.
>>
>
> You can run one of the SMP tests on the realview_pbx_a9_qemu_smp BSP on
> Qemu and set a break point to _CPU_SMP_Send_interrupt() if you want to know
> how it is used.
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
> PGP     : Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
>
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