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From: Bernhard Schmidt <bschmidt@techwires.net>
To: Paul B Mahol <onemda@gmail.com>
Date: Tue, 5 Jan 2010 15:37:55 +0100
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Cc: freebsd-current@freebsd.org
Subject: Re: iwn firmware files
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On Tuesday 05 January 2010 11:32:34 Paul B Mahol wrote:
> Hi,
> 
> iwn firmware files should be generated in /usr/obj directory and not
> in /usr/src.
> 
> I like to mount src dir ro.

Works for me.

# touch foo
touch: foo: Read-only file system
# make buildkernel
[...]
--------------------------------------------------------------
>>> Kernel build for GENERIC completed on Tue Jan  5 15:33:56 CET 2010
--------------------------------------------------------------
#

Did you once run make in sys/modules/iwnfw? A make cleandir might help.

-- 
Bernhard