What are the challenges in designing multicore embedded systems?

Multicore challenges: Workload partitioning (asymmetric vs symmetric multiprocessing), Inter-core communication (shared memory, mailboxes, message passing), Synchronization primitives (spinlocks, semaphores, lock-free structures), Cache coherency (hardware protocols or software management), Memory ordering (barriers for correct operation), Debugging complexity (non-deterministic execution), Power management (per-core scaling), and Real-time determinism (inter-core interference). ARM solutions: SEV/WFE for event signaling, exclusive monitors for atomic operations, memory attributes for shared regions. Design must consider bandwidth, latency, and correctness of shared resource access.