Can mailboxes be useful here? Nothing else that is coming to my mind On Sun, Aug 9, 2015 at 1:44 AM, Rohini Kulkarni <krohini1...@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.sherr...@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.hu...@embedded-brains.de <mailto: >>> sebastian.hu...@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.hu...@embedded-brains.de <mailto: >>> sebastian.hu...@embedded-brains.de> <mailto: >>> sebastian.hu...@embedded-brains.de <mailto: >>> sebastian.hu...@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.hu...@embedded-brains.de <mailto: >>> sebastian.hu...@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.sherr...@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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