FAQ_MA35D1_Run Applications Automatically after Booting by Yocto

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ytliu6
Posts: 62
Joined: 08 Nov 2022, 10:28

30 Nov 2022, 16:51

Run applications after system boot
Linux kernel built by Yocto use systemd initialization, so we need to add a system service to run the applications which you want to run

1. Create systemd service file named “run-before-login-prompt.service” and edit the content below
/home/root/demo.sh is the application you want to run after booting

Code: Select all

[Unit]
Description=Run script with systemd right before login prompt

[Service]
Type=idle
RemainAfterExit=yes
ExecStart=/home/root/demo.sh
StandardOutput=journal+console
[Install]
WantedBy=multi-user.target
2. Put the service file to target board /lib/systemd/system/run-before-login-prompt.service

3. Reboot the device and it will run after booting

4. You can also use Yocto recipe to add the service file to /lib/systemd/system/

5. Refer to FAQ_MA35D1_Add a New Recipe in Yocto
This recipe demo how to install a file to root filesystem and run after booting

Code: Select all

SUMMARY = "Demo how to install files to root filesystem and run after booting"
LICENSE = "CLOSED"
inherit systemd
SYSTEMD_AUTO_ENABLE = "enable"
SYSTEMD_SERVICE_${PN} = "run-before-login-prompt.service"
SRC_URI = "file://run-before-login-prompt.service \
           file://demo.sh \
          "
S = "${WORKDIR}"

do_install() {    
    install -d ${D}/${ROOT_HOME}
    install -m 0777 ${S}/demo.sh ${D}${ROOT_HOME}/demo.sh
    
    install -d ${D}/${systemd_unitdir}/system
    install -m 0644 ${S}/run-before-login-prompt.service ${D}${systemd_unitdir}/system
}

FILES_${PN} = "${bindir} ${systemd_unitdir}/system/* ${ROOT_HOME}"

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