For rt2661 part:
commit72758da782273520090b126a054c2392f682ddc9
authorsephe <sephe>
Tue, 6 Feb 2007 12:46:09 +0000 (6 12:46 +0000)
committersephe <sephe>
Tue, 6 Feb 2007 12:46:09 +0000 (6 12:46 +0000)
tree0e7c4120ce51ac6d45fdb5d93883d6d315321b98
parentd571f6b1f297f7731db0d5b4178da578ea351763
For rt2661 part:
Use relative RX signal strength (relative to noise floor) as RSSI.
sys/dev/netif/ral/rt2661.c
sys/dev/netif/ral/rt2661reg.h