To everybody who is interested in debugging ep93xx_eth.[ch]: With ethtool support, debug messages became runtime configureable. The messagelevel can be displayed / set with # show info, including message level ethtool eth0 # set message level ethtool -s eth0 msglvl 0 # very silent ethtool -s eth0 msglvl 0xffff # very verbose (debug) For further details on how to select specific messages, see[1] and "add" resp. "or" together the various NETIF_MSG_ bits you're interested in. [1] include/linux/netdevice.h drivers/net/arm/ep93xx_eth.c People who don't like messages like "Rx STOP requested" can silence them without touching any source code, now. While the default behavoir may differ from 2.6.11.7, I hope that it is still somewhat reasonable. Feel free to send patches if you think it isn't. Thanks