boot(8) on FreeBSD
The text b6e88891ed20, as FreeBSD 3.2-RELEASE, FreeBSD 3.1-RELEASE shipped it.
system bootstrapping procedures
Flags it lists
-
-C -
-D -
-P -
-a -
-acCdDghPrsv -
-c -
-d -
-g -
-h -
-r -
-s -
-v