1 Add channel mask, transmit rate-mask arguments to wi_scan_ap.
2 Adopt the macros WI_LOCK/WI_UNLOCK for synchronization. FreeBSD
uses a different synchronization mechanism.
3 In wi_cmd, adopt constants WI_DELAY/WI_TIMEOUT for timing.
4 Pull debug messages from into wi_read_nicid from FreeBSD.
5 Bug fix: if IFF_ALLMULTI, don't filter any multicasts.
6 Count and report TX exceptions, but don't generate any additional
interrupts.
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