Symbol: FREEBSD_BOOTONCE
usr/src/boot/libsa/zfs/zfsimpl.c
1866
nvlist_add_string(benv, FREEBSD_BOOTONCE,
usr/src/uts/common/fs/zfs/vdev_label.c
1276
fnvlist_add_string(bootenv, FREEBSD_BOOTONCE, buf);