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主核一般是通过以下流程来唤醒从核。
How to Wake Up Secondary Cores From Primary Core(core0)?
During the boot process, the bootloader executes an IDLE command on the secondary CorePacs and
keeps the secondary CorePacs waiting for an interrupt. After loading the secondary CorePacs application,
the BOOT_MAGIC_ADDRESS in individual corePacs are populated, the application code in the corePac0
can trigger the IPC interrupt to wake up the secondary cores and branch up to the address specified in the
BOOT_MAGIC_ADDRESS
