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
Here's a way to see what gadgets are out there
beagle$ systemctl --all | grep gadget sys-devi...et-usb0.device loaded active plugged /sys/devices/platform/omap/musb-ti81xx/musb-hdrc.0/gadget/net/usb0 network-...t-init.service loaded active exited Start USB Ethernet gadget storage-...t-init.service loaded inactive dead Start usb mass storage gadget udhcpd.service loaded active running DHCP server for USB0 network gadget
or
systemctl --all --full | grep gadget sys-devices-platform-omap-musb\x2dti81xx-musb\x2dhdrc.0-gadget-net-usb0.device loaded active plugged /sys/devices/platform/omap/musb-ti81xx/musb-hdrc.0/gadget/net/usb0 network-gadget-init.service loaded active exited Start USB Ethernet gadget storage-gadget-init.service loaded inactive dead Start usb mass storage gadget udhcpd.service loaded active running DHCP server for USB0 network gadget
Where
network-...t-init.service = network-gadget-init.service storage-...t-init.service = storage-gadget-init.service
/etc/udhcpd.conf is what assigned 192.168.7.1 to the host computer.
To stop the ethernet over USB and start the storage over USB for the current session
beagle$ /bin/systemctl stop storage-gadget-init.service beagle$ /bin/systemctl start network-gadget-init.service
To go the other way:
beagle$ g-ether-start-service.sh
To keep the storage gadget from running on boot up. (I'm still checking this.)
beagle$ systemctl disable storage-gadget-init.service
Embedded Linux Class by Mark A. Yoder