This topic describes various areas that could cause you problems.
Including Extended Attributes
Extended Attributes Set (
associated with the image during its construction must be copied to
the bootable media.
Smack, which is a
Simplified Mandatory Access Control kernel.
NOTE: See https://www.kernel.org/doc/Documentation/security/Smack.txt. for detailed information on Smack.
NOTE: SMACK is a required feature for the AGL Application Framework.
Many methods exist that allow you to create bootable media (e.g.
It is recommended that you do not use
tar to create bootable media.
However, if you do, you must take these steps to copy
xattrs to the media:
tarversion is 1.28 or newer:
$ tar --version tar (GNU tar) 1.28 [snip]
tarif required. Most systems come with
tarinstalled. If you need to install it, see the “Installing tar” section for instructions.
When you build an AGL distribution, a native up-to-date version of
taris created. Use the following command to see that version:
$ tmp/sysroots/x86_64-linux/usr/bin/tar-native/tar --version tar (GNU tar) 1.28 [snip]
Copy the AGL files and Extended Attributes Set to your bootable media:
$ tar --extract --xz --numeric-owner --preserve-permissions --preserve-order --totals \ --xattrs-include='*' --directory=DESTINATION_DIRECTORY --file=agl-demo-platform.....tar.xz
Screen orientation for Splash and in Weston
Depending of your scren mounting the default orientation of the UI an/or splash screen might be incorrect. To change the orientation of the splash screen patch
File: /etc/systemd/system/sysinit.target.wants/psplash-start.service Line: ExecStart=/usr/bin/psplash -n -a 90
To change the orientation of the UI in Weston patch
File: /etc/xdg/weston/weston.ini Line: transform=90
Adding media files to play with MediaPlayer
AGL include the default MediaPlayer sample app which can be used to play music. The
lightmediascanner.service by default will search for media under the
/media folder. So if you plug in any USB stick containing music, they would be recognized and showed in the playlist of the MediaPlayer app menu.
The current supported format is OGG. Please convert your files to ogg to play with MediaPlayer.
NOTE: mp3 is not found by default. For this you need to enable the flags for mp3 support.
In case you want to store music in another place, modify the
/usr/lib/systemd/user/lightmediascanner.service file and change the
--directory parameter to the path of that folder.
If you don’t want to touch the ligthmediascanner service, you can also add a folder named “Music” under
/home/1001/Music and put your music files there.
Configuring the Audio hardware
AGL uses alsa as Audio configuration master. If the correct HW is not setup, the Audio system will fail to start what will also fails the demo Home Screen launch. You need to configure Audio in
AGL does use the new pipewire infrastructure for sound. The configuration is in:
Please see https://git.automotivelinux.org/AGL/meta-agl-devel/tree/meta-pipewire/recipes-multimedia/wireplumber/wireplumber-board-config-agl .