Difference between revisions of "ECE497 Notes on systemd"

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[[Category:ECE497 |Notes sys]]
  
 
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[https://www.linux.com/learn/tutorials/524577-here-we-go-again-another-linux-init-intro-to-systemd/ Here], [https://www.linux.com/learn/tutorials/527639-managing-services-on-linux-with-systemd/ here] and [https://www.linux.com/learn/tutorials/539856-more-systemd-fun-the-blame-game-and-stopping-services-with-prejudice/ here] are some tutorials that look good.
 
[https://www.linux.com/learn/tutorials/524577-here-we-go-again-another-linux-init-intro-to-systemd/ Here], [https://www.linux.com/learn/tutorials/527639-managing-services-on-linux-with-systemd/ here] and [https://www.linux.com/learn/tutorials/539856-more-systemd-fun-the-blame-game-and-stopping-services-with-prejudice/ here] are some tutorials that look good.
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[http://www.freedesktop.org/wiki/Software/systemd/FrequentlyAskedQuestions Here] is information on runlevels.
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[http://crashmag.net/useful-systemd-commands Here] is a nice list of useful commands.
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[http://www.freedesktop.org/wiki/Software/systemd/TipsAndTricks Tips and Tricks]
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=== Gadgets ===
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I found these gadgets
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network-gadget-init.service  storage-gadget-init.service
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in
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/lib/systemd/system
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/usr/bin/update-image-info-on-mmcblk0p1.sh
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is what creates the info.txt file.
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beagle$ '''mount /dev/mmcblk0p1 /mnt'''
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Here's a way to see what gadgets are out there
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beagle$ '''systemctl --all | grep gadget'''
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sys-devi...et-usb0.device loaded active  plugged      /sys/devices/platform/omap/musb-ti81xx/musb-hdrc.0/gadget/net/usb0
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network-...t-init.service loaded active  exited        Start USB Ethernet gadget
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storage-...t-init.service loaded inactive dead          Start usb mass storage gadget
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udhcpd.service            loaded active  running      DHCP server for USB0 network gadget
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or
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systemctl --all '''--full''' | grep gadget
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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
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network-gadget-init.service                                                                  loaded active  exited        Start USB Ethernet gadget
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storage-gadget-init.service                                                                  loaded inactive dead          Start usb mass storage gadget
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udhcpd.service                                                                                loaded active  running        DHCP server for USB0 network gadget
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Where
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'''network-...t-init.service''' = '''network-gadget-init.service'''
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'''storage-...t-init.service''' = '''storage-gadget-init.service'''
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'''/etc/udhcpd.conf''' is what assigned 192.168.7.1 to the host computer.
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To stop the ethernet over USB and start the storage over USB for the current session
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beagle$ '''/bin/systemctl stop  storage-gadget-init.service'''
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beagle$ '''/bin/systemctl start network-gadget-init.service'''
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To go the other way:
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beagle$ '''g-ether-start-service.sh'''
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To keep the storage gadget from running on boot up. (I'm still checking this.)
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beagle$ '''systemctl disable storage-gadget-init.service'''
  
 
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Revision as of 13:11, 19 September 2012

thumb‎ 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.

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

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



thumb‎ Embedded Linux Class by Mark A. Yoder

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