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.