system.mount

[Unit]
Description=Droid mount for /system
Before=local-fs.target systemd-modules-load.service

[Mount]
What=/dev/block/mmcblk0p42
Where=/system
Type=ext4
Options=ro,barrier=1
# 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/surnia/root/fstab.qcom :
# /dev/block/mmcblk0p42         /system      ext4    ro,barrier=1                                        wait