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openrknn: zero-initialize activation BO #90

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Merged
widgetii merged 1 commit into from
Apr 13, 2026
Merged

openrknn: zero-initialize activation BO #90

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6 changes: 6 additions & 0 deletions openrknn/src/openrknn_memory.c
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Original file line number Diff line number Diff line change
Expand Up @@ -159,6 +159,12 @@ int orknn_alloc_model_bos(struct orknn_context *ctx)
orknn_log(0, "memory: failed to allocate activation BO (%u bytes)", act_size);
return -1;
}
/* Zero-initialize activation BO: the NPU reads from activation offsets
* before any task writes to them (e.g., scratch tensor). Without this,
* stale data from previous DMA allocations causes non-deterministic
* output. The vendor's runtime also zero-initializes. */
memset(ctx->activation_bo.map, 0, act_size);
orknn_bo_sync_to_device(fd, &ctx->activation_bo);
orknn_log(1, "memory: activation BO: %u bytes, dma=0x%lx",
act_size, (unsigned long)ctx->activation_bo.dma_addr);

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