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Date: Mon, 18 Sep 2006 10:18:30 -0700
From: Sam Leffler <sam@errno.com>
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Subject: Re: cvs commit: src/sys/dev/ath if_ath.c if_athvar.h
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Henrik Brix Andersen wrote:
> On Mon, Sep 18, 2006 at 04:16:03PM +0000, Sam Leffler wrote:
>> sam         2006-09-18 16:16:03 UTC
>>
>>   FreeBSD src repository
>>
>>   Modified files:
>>     sys/dev/ath          if_ath.c if_athvar.h 
>>   Log:
>>   remove stub radar support; it's never been used and future
>>   hal's will not include the calls (due to redesign)
> 
> I thought radar detection was required for 802.11a devices?

DFS is required in the ETSI regulatory domain.  But I believe the
requirement was slipped and when it will be mandatory is unclear.

> 
> Do you happen to know if the future HALs will introduce another way of
> verifying that no radar is present on the selected channel?

Radar detection never belonged in the hal.  It got stuck there based on
a misunderstanding and has since been removed.  When there is radar
support it will be structured like the rate control code--as an addon to
the driver that operates above the hal.

	Sam