Software Stack

The pccx v002 driver is a C/C++ hardware abstraction layer (HAL) plus a thin public API. Its responsibilities:

  • Encoding and dispatching 64-bit VLIW instructions via the CMD_IN FIFO.

  • Preloading shape / size pointers and scale factors through MEMSET.

  • Driving DMA between the host DDR4 and the NPU L2 cache.

  • Polling STAT_OUT for async completion.

The implementation lives under codes/v002/sw/driver/uCA_v1_api.h / uCA_v1_api.c and carries forward the v001 design with minor comment updates for the pccx v002 ISA reference URL.

Implementation status

v002 driver is at bring-up stage: the public uca_* API surface compiles and the AXI-Lite HAL skeleton exists, but the end-to-end MEMSET → MEMCPY → GEMV → MEMCPY readback flow has not yet been validated against the RTL on hardware. See Verification §2 for the open verification items.

Local LLM launcher — status surface boundary

Driver bring-up is being mirrored at the launcher boundary by pccx-llm-launcher. The launcher’s chat surface gates inputs and outputs through a documented set of boundaries — chat status summary, evidence manifest, gap matrix, review packet, redaction policy, clipboard policy, accessibility, and empty-state — none of which produce hardware-measured numbers at this stage. The launcher is referenced here so contributors can locate the workflow boundary; runtime / inference numbers will appear here only after the release evidence checklist gates them in.