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Added OBSW Watchdog #67

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meierj merged 20 commits from mueller/added-watchdog into develop 2021-07-31 08:51:56 +02:00
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README.md
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@ -591,6 +591,10 @@ More detailed information about the used q7s commands can be found in the Q7S us
## Launching an application at start-up ## Launching an application at start-up
You can also do the steps performed here on a host computer inside the `q7s-rootfs` directory
of the [Q7S base repository](https://egit.irs.uni-stuttgart.de/eive/q7s-base). This might
be more convenient while also allowing to update all images at once with the finished `rootfs.xdi`.
Load the root partiton from the flash memory (there are to nor-flash memories and each flash holds Load the root partiton from the flash memory (there are to nor-flash memories and each flash holds
two xdi images). Note: It is not possible to modify the currently loaded root partition, e.g. two xdi images). Note: It is not possible to modify the currently loaded root partition, e.g.
creating directories. To do this, the parition needs to be mounted. creating directories. To do this, the parition needs to be mounted.
@ -616,7 +620,7 @@ creating directories. To do this, the parition needs to be mounted.
chmod +x application chmod +x application
``` ```
5. Create systemd service in /lib/systemd/system. The following shows an example service. 5. Create systemd service in `/etc/systemd/system`. The following shows an example service.
```sh ```sh
cat > example.service cat > example.service
@ -634,12 +638,20 @@ creating directories. To do this, the parition needs to be mounted.
[Install] [Install]
WantedBy=multi-user.target WantedBy=multi-user.target
``` ```
6. Enable the service. This is normally done with systemctl enable. However, this is not possible
when the service is created for a mounted root partition. Therefore create a symlink as follows. 6. Enable the service. This is normally done with `systemctl enable <service>` which would create
a symlink in the `multi-user.target.wants` directory. However, this is not possible
when the service is created for a mounted root partition. It is also not possible during run
time because symlinks can't be created in a read-only filesystem. Therefore, relative symlinks
are used like this:
```sh ```sh
ln -s '/tmp/the-mounted-xdi-image/lib/systemd/system/example.service' '/tmp/the-mounted-xdi-image/etc/systemd/system/multi-user.target.wants/example.service' cd etc/systemd/system/multi-user.target.wants/
ln -s ../example.service example.service
``` ```
You can check the symlinnks with `ls -l`
7. The modified root partition is written back when the partion is locked again. 7. The modified root partition is written back when the partion is locked again.
```sh ```sh
writeprotect 0 0 1 writeprotect 0 0 1