On Mon, 1 Oct 2007, Stephen Borrill wrote:
> The last patch (AFAIK) is this:
> http://www.invisible.ca/~jmcneill/netbsd/bootprops4.patch
>
> The development is currently dormant, so that patch is probably not too far 
> off.

The latest code is actually in a subversion repository:

   http://source.invisible.ca/svn/netbsd/branches/jmcneill-bootprops/

Cheers,
Jared