Yeah I am not sure how this OpenWRT /etc/config/fstab works,
but here is a “normal fstab”,
# stock fstab - you probably want to override this with a machine specific one
/dev/root / auto defaults 1 1
# Where the U-Boot environment resides; for devices with SD card support ONLY!
/dev/mmcblk0p1 /uboot auto defaults,sync 0 0
/dev/mmcblk0p4 /data auto defaults 0 0
I do not know if you can black-list devices from automount logic, which is something I would recommend to black-list mmcblk0p2 and mmcblk0p3.
Why do you need auto-mount?