[Mount]
What=/dev/mmcblk0p3
Where=/system
Type=ext4
Options=ro
# Options had SELinux context option:

# Default is 90 which makes mount period too long in case of
# errors so drop it down a notch.
TimeoutSec=10

[Install]
WantedBy=local-fs.target

# From ./out/target/product/grouper/root/fstab.grouper :
# /dev/mmcblk0p3           /system             ext4      ro                                                                                  wait