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tenstorrent / luwen

Tenstorrent system interface library
Apache License 2.0
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Possible false "outstanding PCIE DMA request" error #7

Open sbansalTT opened 1 week ago

sbansalTT commented 1 week ago

Running the test eth_fw_data_check causes luwen to think that DMA keeps going so the chip hangs with the following error -
It is not currently safe to communicate with ARC because, there is an outstanding PCIE DMA request Did some digging and looks like the register ARC_CSM.ARC_PCIE_DMA_REQUEST.trigger has a non 0 value, while if that same register is read using the old backend I see its value being 0

yangxuTT commented 3 days ago

Reading from spi or running test-pcie-dma produces the same error. This was observed on 2 different WH systems, in both cases the chip was still accessible afterwards and passes test-pcie-dma.