Where are the mechancs of config(8) descibed

Vincent Hoffman vince at unsane.co.uk
Tue Sep 11 09:34:13 UTC 2012

On 11/09/2012 01:30, Robert Bonomi wrote:
> (This is probably a bit techical for 'questions' -- I'd welcome a suggesstion
> of a more appopriae forum.)
If you dont get any joy, try freebsd-hackers at freebsd.org

> Is there a detailed description anywhere of the mechanics of *how* config(8) 
> does what it doess?
> I'm looking fo the gory detail of how, sayi, 'device bpf' causes the
> creation of the file 'opt_bpf.h' containing '#define DEV_BPF 1"
> _Part_ of the magic is the sys/conf/files* and sys/conf/options* files,
> but their format/content isn't defined anywhee I've found.
> rerason for asking -- I want to addd a cutom device driver into the
> kernel.  I have sources, and can build the .o,   if i convert it to
> a .ko, it loads and run.  *BUT* I want to embed it in the kernel at
> build time.
> "Somewhere", I have do define 'device foo', specify that that name
> adds 'myfoo_sys.o' to the kernel object-files list, and that 
> myfoo_sys.o depends on a list of source files, and requires a 
> particular sequence of commands to build from those shources.
> I know the 'what', just not the 'where' or 'how'.
> Any pointers appreciated.
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