On Monday 24 I tried to test busybox init (with CONFIG_INIT and CONFIG_FEATURE_USE_INITTAB), without success.
I created a virtual machine with Debian GNU/kFreeBSD on it.
I installed the busybox deb I had built.
I substituted /sbin/init with a symlink to busybox.
I executed on the shell "init 6" (a.k.a. "reboot"), obtaining a usage message from busybox init; pressing Ctrl+C returns to normal shell.
This is because "BusyBox init doesn't support multiple runlevels" (from busybox man page).
On Wednesday 27 I tried to enable more applets.
Some of them built without patches needed; they are:
-CONFIG_FEATURE_INIT_SCTTY
-CONFIG_FEATURE_INIT_SYSLOG
-CONFIG_FEATURE_EXTRA_QUIET
-CONFIG_HALT
Instead CONFIG_MOUNT and CONFIG_PIVOT_ROOT seem to need a lot of work...