create sd card to flash eMMC and affect /etc/fstab

I have a project running on eMMC with a custom entry in the /etc/fstab (intended to mount a blank SD card on boot).

So I use the /opt/scripts/tools/eMMC/ script to create an sd flasher. Then I turn around and flash the eMMC with it, ssh login, and find that /etc/fstab no longer has my custom entry in it.

How can I resolve this? Or do I just have to flash every card and ssh in to add that custom fstab entry for every eMMC I flash?

'today' add your custom entries right after this line:

echo "debugfs /sys/kernel/debug debugfs defaults 0 0" >>


Thank you!