[Sunhelp] building kernel

[nathan]

I was JUST getting ready to format an old LX and put a 2.7 on it when
I rememberd that it  has an external serial port array that hangs off
the back of it thru "some" kind of interface.

i would ASSUME that this requires some special kernel driver to operate,
however, i have ZERO experience with solaris kernels

i've created and compiled many a kernel under linux and *bsd, but not
solaris.

how might i go about lookin for this driver before i wipe the system
clean?
is there a kernel config file that i can look at?
if i find it, can i just move it to the new system, and recompile? if
so, how?

thanks!
nathan