Making a custom boot (install) disk?

[Erich <hh@cyberpass.net>]

Does anyone have any tips for making a boot disk with a special
kernel?  I need to install OpenBSD on a RAID array on a Vortex
controller.  The default boot floppy doesn't have a controller for
this, so my plan is to make up a custom boot floppy.

I mounted floppy27.fs using the vnd, so I could see it had just two
files: bsd and boot.  I assume that I can replace the bsd file with
any custom kernel I have configured?  Or is it like FreeBSD, where the
kernel must be compiled with the MFSROOT option?  I know there are
tight size restrictions on the kernel, but this shouldn't be a problem
because I only need a very few drivers on the install kernel.

Thanks for any tips,

e