I have tried to build a static variant of io-pkt-v4-hc with devnp-ath driver by enabling it in sys/static_drvr_netbsd.mk
. 

There are two minor build issues with that variant: 

1) the build process tries to build io-pkt-v? (non-hc) as well, which fails because of missing ieee80211_* symbols. The 
only "fix" i could come up with was to touch Makefile.dnm in sys/target/*/o.*.v? for all CPUs that are being built.
Is there any better way? 

2) libnbdrvr.a is appearantly not linked in the static variant which causes some missing symbols. Adding it to LIBS in 
sys/target/common.mk worked for me. 

Christopher