Status update on the ethernet TX issue (iperf tests ending abruptly with some kilobytes transferred and the like) The cause has been known for a while to be some error in the hardware offloading of TX checksumming. (TX is when the board sends bits out)   One way to avoid that issue is to disable TX checksumming (getting the CPU itself to handle that) e.g.: using ethtool introducing a flag in the dts that among other things, does just that or by disabling i