There may be several ways to deal with the messages:
1) Turn off and ignore
Portmap messages FAQ
2) Address the hardware issue. My attempts to use NetBSD with an atheros wireless network card generate frequent error messages regarding the device timing out. Setting
Code:
hw.ath0.txintrperiod=1
in
/etc/sysctl.conf helps. You might want to either post your error messages or paste the message into your favorite search engine