The "file" type boot modules should be available after the root filesystem is mounted in /system/boot. A filesystem implementation and mount call in vfs.c will be required here.
Former user commented on 2014-05-14T19:16:26.000-0400:
illumos-joyent commit 74d5b5a (branch master, by Robert Mustacchi)
OS-2677#icft=OS-2677 modules should appear in /system/boot
Reviewed by: Keith M Wesolowski <wesolows@foobazco.org>
Former user commented on 2014-05-15T12:35:14.000-0400:
illumos-joyent commit 2dd47db (branch master, by Robert Mustacchi)
OS-2677#icft=OS-2677 modules should appear in /system/boot (fix makefile)