SMP support for Raspberry Pi 2

[Sebastian Huber]

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
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