ECE497 Notes on systemd
Embedded Linux Class by Mark A. Yoder
The new BeagleImages use systemd for user space initialization.
Here, here and here are some tutorials that look good.
Here is information on runlevels.
Here is a nice list of useful commands.
Gadgets
I found these gadgets
network-gadget-init.service storage-gadget-init.service
in
/lib/systemd/system
/usr/bin/update-image-info-on-mmcblk0p1.sh
is what creates the info.txt file.
beagle$ mount /dev/mmcblk0p1 /mnt
Embedded Linux Class by Mark A. Yoder