From NetBSD:

From NetBSD:
Add support for loading kernel into fastmem, if the kernel also supports
loading into fastmem.  This removes the requirement that the kernel fit
into chipmem.
Add a -Z flag to force loading into chip memory.
Add a -s option for compatibility with my bootblock loader.
Move the test exit to just before starting the kernel;  this lets the
test mode actually load the kernel and do the version checks.