If you have tried everything, and just cannot figure out
what the kernel is asking kerneld to do, there is a way of
seeing the requests that kerneld receives, and hence to figure
out what should go into /etc/conf.modules:
The kdstat utility.
This nifty little program comes with the modules-package,
but it is not compiled or installed by default. To build it, go
to the directory where you have the kerneld sources and type
make kdstat. Then, to make kerneld display
information about what it is doing, run kdstat debug
and kerneld will start spewing messages on the
console about what it is doing. If you then try and run the
command that you want to use, you will see the kerneld requests;
these can be put into /etc/conf.modules and
aliased to the module needed to get the job done.
To turn off the debugging, run /sbin/kdstat
nodebug.