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Date: Tue, 31 Aug 2010 14:44:28 +0300
From: Taras Korenko <ds@ukrhub.net>
To: Michael BlackHeart <amdmiek@gmail.com>
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Cc: freebsd-stable@freebsd.org
Subject: Re: Broadcom Wireless BCM4312 Rev.02 (BCM4310 UART) troubles
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On Tue, Aug 31, 2010 at 02:30:54PM +0400, Michael BlackHeart wrote:
> Hello
> 
> I've got a problem with Broadcomm Wireless.
> I have notebook HP Compaq 6720s with BCM4312.
> [...]

> ifconfig bwn0 up scan
> bwn0: firmware version (rev 410 patch 2160 date 0x751a time 0x7c0a)
> ifconfig: unable to get scan results
> [...]

  Why don't you try to play with wlan(4) on top of bwi/bwn?
An example is here: handbook / 31.3.3.1.1 How to Find Access Points.

-- 
  Best regards,
  Taras Korenko