BoardConfig:
------------
MR_FSTAB := device/htc/m7univ/multirom/mrom_m7.fstab
MR_USE_MROM_FSTAB := true


and "mrom_m7.fstab":
--------------------
# mount point   fstype      device  [device2]                                   [parameters]
/boot           emmc        /dev/block/platform/msm_sdcc.1/by-name/boot

/data           ext4        /dev/block/platform/msm_sdcc.1/by-name/userdata     defaults    wait,check,formattable,encryptable=/dev/block/platform/msm_sdcc.1/by-name/extra
/data           f2fs        /dev/block/platform/msm_sdcc.1/by-name/userdata     defaults    wait,check,formattable,encryptable=/dev/block/platform/msm_sdcc.1/by-name/extra


#--Not Needed by MultiROM--
#--------------------------
#/cache          ext4        /dev/block/platform/msm_sdcc.1/by-name/cache
#/devlog         ext4        /dev/block/platform/msm_sdcc.1/by-name/devlog
#/misc           emmc        /dev/block/platform/msm_sdcc.1/by-name/misc
#/recovery       emmc        /dev/block/platform/msm_sdcc.1/by-name/recovery
#/system         ext4        /dev/block/platform/msm_sdcc.1/by-name/system

# USB storage
#/usb-otg        auto        /dev/block/sda1  /dev/block/sda                    defaults    voldmanaged=usbdisk:auto
#/usb-otg        auto        /devices/platform/msm_hsusb_host                   defaults    voldmanaged=usbdisk:auto
#/usb-otg        auto        /devices/platform/msm_hsusb_host/usb*              defaults    voldmanaged=usbdisk:auto