drawing it right:

phy1-----cpu1========[logic]=========cpu2-------phy2
           |    mii           mii     |
          ram                        ram


Simply put it's a router. There is an MII link for both directions 
(receive and send).
If I write a NIC driver, I can understand how the input (phy1) is going
to work:
interupt, callback to device driver, put packet on ipqueue, process it.
But on the output, out of ip_output() is when I want to forward it to
cpu2, not back to the interface.
That's where I am wondering if there is a kernel interface for MII.
Hopefully my problem is a little bit more clear now.
Thanks a lot

Jerry

Thor Lancelot Simon <tls@rek.tjls.com> wrote on 09/24/2005, 05:04:12 AM:
> On Sat, Sep 24, 2005 at 02:28:01AM +0200, jerry@evasefor.com wrote:
> > 
> > Good afternoon list,
> > I have a single board computer with 2 cpu each running their own netbsd
> > kernel:
> > 
> > PHY--CPU1-----------logic---------CPU2---PHY
> >             mii bus         mii bus
> > 
> > after I'm done processing a packet on CPU1 how can I address it
> > to CPU2?
> 
> If you drew that diagram right, then I think you need to write a network
> interface driver that talks on the mii bus between the CPUs and the
> mysterious "logic".  Once you do that, UDP should suffice.