SMP support for Raspberry Pi 2

[Rohini Kulkarni]

Can mailboxes be useful here? Nothing else that is coming to my mind

On Sun, Aug 9, 2015 at 1:44 AM, Rohini Kulkarni <krohini1593 at gmail.com>
wrote:

> Hi,
>
> I am stuck at how to set up IPI for Pi 2. This
> <https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2836/QA7_rev3.4.pdf>
> is a document I have referred to get an idea of interrupts. Would be great
> to get some help on how to proceed.
>
> On Fri, Jul 31, 2015 at 7:33 PM, Joel Sherrill <joel.sherrill at oarcorp.com>
> wrote:
>
>>
>>
>> On 7/31/2015 8:11 AM, Rohini Kulkarni wrote:
>>
>>> 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?
>>>
>>
>>
>> https://docs.rtems.org/doc-current/share/rtems/html/c_user/Configuring-a-System-SMP-Specific-Configuration-Parameters.html#Configuring-a-System-SMP-Specific-Configuration-Parameters
>>
>> and see the smptests. Many of which do specify the maximum.
>>
>> Thanks.
>>>
>>> On 29 Jul 2015 15:29, "Sebastian Huber" <
>>> sebastian.huber at embedded-brains.de <mailto:
>>> 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> <mailto:
>>> 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 <mailto:
>>> sebastian.huber at embedded-brains.de>
>>>     PGP     : Public key available on request.
>>>
>>>     Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>>>
>>>
>> --
>> Joel Sherrill, Ph.D.             Director of Research & Development
>> joel.sherrill at OARcorp.com        On-Line Applications Research
>> Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>> Support Available                (256) 722-9985
>>
>
>
>
> --
> Rohini Kulkarni
>



-- 
Rohini Kulkarni
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