See Doxygen comments of Per_CPU_State. The boot_card() must be called by
exactly one processor. For the Cortex-A9 MPCore there is a branch in
bsp_start_hook_0() according to the CPU index.
----- Rohini Kulkarni <krohini1...@gmail.com> schrieb:
>Hi all,
I am trying to understand boot up for ARM BSPs so as to be able to implement
SMP support for Pi 2.
Please correct me where I am wrong. (It is verbose. But I have tried to make
things as clear as I could)
[1] From start.S for ARM, all cores start together. They run the bsp_start hook
0 and 1 and then go to boot_card() .
boot_card() calls rtems_data_sructure_initialize() which further does SMP
related initilazations.
[2] the bsp_start_hooks include cpu initialization for cache/mmu etc. This is
done for all cores before SMP initializations from boot_card(). For
> Raspberry Pi 2, only primary core, which is core 0, will run after
> reset, while other cores will wait for a jump address from where to
> execute.
I need to ensure the sequence remains consistent for Pi 2. So before boot_card
is called() , I need to get other cores to do the initialization from start.S
while core0 waits. Is there something else that can be done?
[3] Where do the other cores start waiting for an interrupt from primary core.
Where does the interprocessor interrupt come into picture.
Thanks!
--
Rohini Kulkarni
>
--
Sebastian Huber, embedded brains GmbH
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