Origin for each line in bootfs.init.mk from check-in 7a1e7f4a58:

7a1e7f4a58 2019-10-21    1: bootfs: fsck
7a1e7f4a58 2019-10-21    2: 	echo "MRC:$@> Checking whether we need /boot mounted."
7a1e7f4a58 2019-10-21    3: 	mount -vadr | grep -q ' /boot$$' && mount -r /boot || true