From owner-freebsd-drivers@FreeBSD.ORG  Mon Feb 25 13:47:58 2008
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Date: Mon, 25 Feb 2008 16:28:42 +0300
From: Eygene Ryabinkin <rea-fbsd@codelabs.ru>
To: Yehonatan Yossef <yoniy@mellanox.co.il>
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Cc: freebsd-net@freebsd.org, freebsd-questions@freebsd.org,
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Subject: Re: Capturing dmesg upon system crash on 6.3
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Yehonatan, good day.

Mon, Feb 25, 2008 at 11:28:12AM +0200, Yehonatan Yossef wrote:
> I'm a freebsd newbee, trying to port an ethernet driver from Linux to
> FreeBSD 6.3.
> I'm facing a system reboot upon loading of the driver, and I could use a
> tool for capturing dmesg upon system crash (such as netconsole on
> Linux).

May be serial console will help you?
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/serialconsole-setup.html

Out of curiosity: are you porting some InfiniBand drivers to FreeBSD?
-- 
Eygene