Network device driver issues.

[Alok Barsode]

Hello,
I am porting freeBSD 4.10 to a embedded board. 
The board has 2 Three speed Ethernet Controller and a
Cicada PHY.
I have implemented a pseudo-bus (called mpcbus) which
attaches itself to nexus.
i plan to attach all the devices to the mpcbus. (i
will be calling the IDENTIFY function for each
device-driver).All the devices are memory 
mapped.
Now i have 2 TSEC(Three-Speed Ethernet Controller)on
the board(say TSEC0 and TSEC1). 
During the IDENTIFY routine, should the function
BUS_ADD_CHILD() called twice ,once for each TSEC?

I also dont what the PHY to be configured sepatately.
(I right now dont want any "mii" stuff) I will
configure the PHY manually. is this fine 
with the freeBSD point of view? I dont understand the
struct xxx_mii_frame. 
i am looking at the National Semiconductor
DP83820/DP83821 gigabit 
ethernet driver (i.e /dev/nge/if_nge.c)

 The frame structure is: 
struct nge_mii_frame {
         u_int8_t                mii_stdelim;
         u_int8_t                mii_opcode;
         u_int8_t                mii_phyaddr;
         u_int8_t                mii_regaddr;
         u_int8_t                mii_turnaround;
         u_int16_t               mii_data;
 };All the drivers use this kind of frame structure. 
Is this a generic one? how does one use it? 

is there a simple driver i can look at? or a simple
tutorial on network drivers?
the National Semiconductor driver is a bit complex.

Thanks,
alok.

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