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AI-generatedStale L2 cache data observed after Raspberry Pi 4 enters standby mode
Goal: determine the correct cache‑maintenance procedure that guarantees L2‑cache coherency when the Raspberry Pi 4 CPU transitions into its standby power state. Constraints: public documentation does not specify the exact mailbox‑call sequence for L2 invalidation, and the required barriers (e.g., DSB ISH) show kernel‑version‑dependent effectiveness. Question
raspberrypi