OTA feature is enabled with agl-ota parameter added to agl-setup (see Download and Build AGL Source Code). It allows you to build image that can later be upgraded over TCP/IP conection using OSTree and SOTA client.

To enable OTA feature just add agl-ota to the feature list when setting up your environment.

  source meta-agl/scripts/aglsetup.sh -m qemux86-64 agl-demo agl-netboot agl-appfw-smack agl-sota

You can then edit your local.conf

  vim conf/local.conf

to tune several parameters.

• OSTREE_REPO sets local OSTree repository, to which your resulting image will be committed.
• OSTREE_BRANCHNAME is the ref name in your local repository.
• OSTREE_OSNAME is the OS name in OSTree repository on your target device. See OSTree documentation for the details.

After that just build your desired image e.g.

  bitbake agl-demo-platform

As a result of the building process you will get the following:

1. The whole root filesystem together with the kernel and initramfs commited to OSTree repository set in OSTREE_REPO on a branch set in OSTREE_BRANCHNAME
2. Archived exact copy of the commited tree ('*.rootfs.ostree.tar.bz2' file)
3. Live bootstrap image with the commited tree as the only OSTree deployment ('*.otaimg' file).

To boot into the resulting image, provided you've built it for QEMU run

  ../meta-agl-extra/meta-sota/scripts/runqemu qemuparams="-vga std" tmp/deploy/images/qemux86-64/agl-demo-platform-qemux86-64.otaimg

runqemu script from poky upstream is not able to work with OTA images at the moment.