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
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