Why does the ethernet hang when running Linux on my Arria 10 HPS system? - Why does the ethernet hang when running Linux on my Arria 10 HPS system? Description Due to a problem in the Linux driver for the Synopsys® Ethernet MAC in the linux-socfpga kernel version 4.1.22-ltsi, ethernet interface may stall if there is increased traffic within the HPS sub system. When this problem appears the HPS EMAC DMA Status registers will show the following state: i_emac_<X>_dmagrp_status: rs (Received Process State) : 0x5: RUNCLOSE : Running: Closing Receive Descriptor The following registers status may also be present tu (Transmit Buffer Unavailable): 0x1 : Transmit Descriptor Unavailable ovf (Receive Overflow): 0x1 : Receive Buffer overflow Resolution This problem has been fixed for the linux-socfpga 4.1.33-ltsi kernel available from https://github.com/altera-opensource Commit ID: 9a8bc214cc13bb318f403b ("stmmac: share reset function between dwmac100 and dwmac1000") Commit ID: b0db4ee2b475f0b7ac1e36 ("stmmac: rework DMA bus setting and introduce new platform AXI structure") To work around this problem in earlier Kernel versions, edit the EMAC DMA control registers to set axi_bus_mode rd_osr_lmt and wr_osr_lmt registers to 0xF. This setting allows a greater number of outstanding AXI transactions on the EMAC DMA AXI Master interface. Custom Fields values: ['novalue'] Troubleshooting FB: 417568; False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 17.0 16.0 ['Arria® 10 SX FPGA'] ['novalue'] ['novalue'] ['novalue']