relation between different components of the FreeBSD

[s m]

hello all

for my study case i need to know the architecture of FreeBSD in
detail. i googles so much but every available handbook or pages, talks
just about the component of FreeBSD and how they are configured.

i need to know the relation between components such as kernel, drivers
and etc, and how they work together. some thing like a diagram is so
nice and would help me.

any body knows any resources about it?

thanks