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openrknn: document vendor multi-core submit from decompile - #92
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From decompiling librknnrt.so's submit path and ioctl tracing: - Vendor sends 10 ACTION ioctls during init (POWER_ON, GET_IOMMU_EN, etc.) - Vendor submit: core_mask=0 (AUTO), subcore_task all zeroed, task_number=N*3 - Kernel auto-distributes tasks across all 3 NPU cores - core_mask=0 with tripled tasks crashes kernel without vendor's context setup - Single-core tasks only cover ~512/1024 spatial positions (by design) - Tripled tasks on single core: kernel rejects (task_start+count exceeds BO) The 50% spatial coverage is a fundamental architectural feature: the RKNN compiler generates single-core tasks for half the spatial dimension, with multi-core replicas for the other half. Full coverage requires kernel-level multi-core dispatch that openrknn's OWN mode doesn't implement yet. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Documents findings from decompiling the vendor's submit path in librknnrt.so:
rknpu_submitwithcore_maskfrom ctx+2428,subcore_task[]all zeroedrknn_set_core_mask(sub_E1260) just stores the mask value — no kernel ioctltask_number = N*3withcore_mask=0(AUTO) for 3-core executioncore_mask=0with tripled tasks causes kernel panic without vendor's context setupDisabled the vendor-3core submit path to prevent panics.
Key decompile references
Next step
Reproduce the vendor's kernel init sequence:
0x40086414to allocate a context handle0x40106410to configure NPU corescore_mask=0and tripled task count🤖 Generated with Claude Code