3_LinuxStartUpScript.md

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Developing a Linux Startup script

Linux Startup scripts are really important for Embedded Linux systems. Application services should start directly after a boot. This is particularly necessary because rsyocto has a watchdog timer activated and the system can therefore restart unexpectedly. For this reason, three possible ways to activate startup scripts are shown.

1. Adding a startup script during runtime

• For that the tool udate-rc.d (see here) is pre-installed
• Create a new Linux Shell script remotely with Microsoft Visual Studio Code Insider or with nano

  nano /etc/init.d/myScript.h

• Write the script

  #!/bin/sh
  # Your script
  echo "Hello SoC-FPGA"

• Activate the script at startup

  chmod +x /etc/init.d/myScript.h
  update-rc.d myScript.h defaults 100
  

2. Adding a startup script during image creation

With the rsyocto building script it is possible to add startup scripts into an image file. That was shown, as well.

3. Adding a startup script with the Yocto project

For the development of rsyocto I designed a simple way to import startup scripts with the Yocto project. This is a part of the meta-intelfpga-layer (see here).

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