ECE497 Notes on systemd

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.

Tips and Tricks

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

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

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