Issues with Network device drivers

[Alok Barsode]

Hello,
I had some basic questions regarding the FreeBSD
Device driver model(I am using FreBSD4.10 ) 
I have a Phy-Controller for which I am developing a
device driver.
I have writing the PHY driver(/sys/dev/mii/my_phy.c)
In order to test it,I wanted to build it as a module.
I have a few Q:

1. Is it possible to get the phy driver build
separately        (as a module)than the miibus module?
Or will the phy support be interated in the miibus
module?(The Makefile in /sys/modules/mii suggests that
all PHYs support is integrated in miibus.ko)

2. Will i have to make a new entry in the
/i3s6/conf/MYKERNEL indicating a new device under MII?


3. Is the Network Device driver model not documented
in  detail?  

Thanks,
Alok.


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