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From: John Baldwin <jhb@freebsd.org>
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Date: Tue, 18 Oct 2005 14:30:14 -0400
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Cc: Bharma Ji <bharmaji@gmail.com>
Subject: Re: How to build only the modified in the driver.
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On Tuesday 18 October 2005 02:10 pm, Bharma Ji wrote:
> When I do make buildkernel conf=<my conf file>, the entire kernel seems to
> be built. Is there a way to build only the driver files that have been
> modified? I have also tried make buildkernel conf = GENERIC and modified a
> random file in one of the drivers. The entire kernel still gets built.
> Thanks for any answers

Use NO_KERNELCLEAN=yes.  You may also be able to use NO_KERNELCONFIG=yes and 
NO_KERNELDEPEND=yes to speed up things in certain cases as well.

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org