Device configuration and Structure

[Alok Barsode]

Hi all,
I wanted to know how r memory-mapped devices
configured during initialization?

Like for example if i have a PCI ethernet card,which
is attached to the PCI bus.The PCI bus will probe the
attached device, call all the associated drivers (in
the driver list in devclass pcibus)during autoconf and
associate a driver which bids the max,But what if i
have a onboard memory-mapped ethernet controller? what
bus will it attach itself to? 

I am developing a device driver for a onboard memory
mapped ethernet controller.

Thanks,
Alok. 

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