Raspberry Pi test report

[Niteesh]

What is your debugging setup? It would be really helpful for my future
works on Rpi3.

Thanks,
Niteesh

On Tue, 21 Jan, 2020, 7:23 AM Alan Cudmore, <alan.cudmore at gmail.com> wrote:

> A little more information on my Raspberry Pi 2 SMP tests:
>
> The BSP startup is getting to this loop:
> https://git.rtems.org/rtems/tree/cpukit/score/src/percpustatewait.c#n49
> (In the function _Per_CPU_State_wait_for_non_initial_state)
> In the while loop on line 49, the CPU state is PER_CPU_STATE_INITIAL (0).
> The while loop calls _CPU_SMP_Processor_event_receive() and returns,
> but the state is still 0
> It calls _CPU_SMP_Processor_event_receive() again and does not return.
>
> I'm reading up on the defines in percpu.h (comments for the defines
> are very helpful by the way)
> Based on what I can tell in the comments, the boot CPU will wait in
> PER_CPU_STATE_INITIAL
> until the secondary processors complete their primary initialization
> and transition to
> PER_CPU_STATE_READY_TO_START_MULTITASKING.
>
> Next is to figure out why the secondary processors are not
> transitioning or possibly why events are not occurring?
>
> Alan
>
> On Mon, Jan 20, 2020 at 6:25 PM Chris Johns <chrisj at rtems.org> wrote:
> >
> > On 21/1/20 10:20 am, Alan Cudmore wrote:
> > > As it turns out the latest RTEMS master may need some of the dtb
> > > and/or overlay files in the raspberry pi SD card. But the updated
> > > instructions that Niteesh submitted for the raspberrypi BSP should
> > > still be valid.
> >
> > Great.
> >
> > > Either way, we should be able to automate it. A firmware release on
> > > Github is ~180 megabytes. If you clone the whole repository, it's 10+
> > > Gigabytes, probably because you get every binary release.
> >
> > Ouch. If we list the needed files, even if there is a few, I can fetch
> them from
> > github and avoid a full clone. We would need to settle on a specific
> hash or
> > version but that is not a bad thing.
> >
> > > I'm trying to troubleshoot the RPi 2 SMP a little bit now. Non SMP
> > > code seems to work on the Pi 2, but when you have an example with
> > > #define CONFIGURE_MAXIMUM_PROCESSORS 4
> > > it crashes during initialization.
> >
> > Awesome and all the best. I am sure you will figure it out.
> >
> > Chris
>
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