Hello Everyone, I am working for Hexagon Mining in Baar (some of our people were on the last nuttx summit). Our project involves nuttx and runs on a stm32h743zi. Our nuttx version was recently (mid January) updated.
We recently recognised that the ethernet of our platform dies after some time. After some investigation it looks like that the DMA of the ethernet ends up in a deadlock since no further descriptors are available and also not freed. It all starts with a packet which is not processed right away but in the next interrupt handling cycle after the next ETH_DMACSR_RI appeared. It then either collapses or will have a massive slow down. In case of a collapse everything will stop (incl. ping) since the chain is stopped around the DMA. So far it only happened during a longer data transfer. The device works fine over days just sitting there and responding to the broadcasts on the network. To verify the problems we also used the TCPblaster example with a minimum code base from our side. There, it only happens if multiple threads are used. One thread alone is handled well as it seems. The TCPblaster worked fine on the stm32f7. I am wondering if anyone had this or a similar problem before. If you need more information please let me know. Thanks in advance for your thoughts and helps. Best Regards, Reto Gähwiler
