Add support for device tree overlays in FIT imagesfeat/fit-dtbo

Signed-off-by: Anton Gerasimov <anton.gerasimov@here.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/README.adoc b/README.adoc
index ea9bb21..27ecabf 100644
--- a/README.adoc
+++ b/README.adoc
@@ -81,6 +81,7 @@ Although we have used U-Boot so far, other boot loaders can be configured work w
 * `OSTREE_COMMIT_BODY` - Message attached to OSTree commit. Empty by default. 
 * `OSTREE_COMMIT_SUBJECT` - Commit subject used by OSTree. Defaults to `Commit-id: ${IMAGE_NAME}`
 * `OSTREE_UPDATE_SUMMARY` - Set this to '1' to update summary of OSTree repository on each commit. '0' by default.
+* `OSTREE_DEPLOY_DEVICETREE` - Set this to '1' to include devicetree(s) to boot
 * `INITRAMFS_IMAGE` - initramfs/initrd image that is used as a proxy while booting into OSTree deployment. Do not change this setting unless you are sure that your initramfs can serve as such a proxy.
 * `SOTA_PACKED_CREDENTIALS` - when set, your ostree commit will be pushed to a remote repo as a bitbake step. This should be the path to a zipped credentials file in https://github.com/advancedtelematic/aktualizr/blob/master/docs/credentials.adoc[the format accepted by garage-push].
 * `SOTA_DEPLOY_CREDENTIALS` - when set to '1' (default value), deploys credentials to the built image. Override it in `local.conf` to built a generic image that can be provisioned manually after the build.
@@ -88,7 +89,9 @@ Although we have used U-Boot so far, other boot loaders can be configured work w
 * `SOTA_CLIENT_FEATURES` - extensions to aktualizr. The only valid options are `hsm` (to build with HSM support) and `secondary-network` (to set up a simulated 'in-vehicle' network with support for a primary node with a DHCP server and a secondary node with a DHCP client).
 * `SOTA_SECONDARY_CONFIG_DIR` - a directory containing JSON configuration files for virtual secondaries on the host. These will be installed into `/etc/sota/ecus` on the device and automatically provided to aktualizr.
 * `SOTA_HARDWARE_ID` - a custom hardware ID that will be written to the aktualizr config. Defaults to MACHINE if not set.
-* `OSTREE_DEPLOY_DEVICETREE` - Set this to '1' to include devicetree(s) to boot
+* `SOTA_MAIN_DTB` - base device tree to use with the kernel. Used together with FIT images. You can change it, and the device tree will also be changed after the update.
+* `SOTA_DT_OVERLAYS` - whitespace-separated list of used device tree overlays for FIT image. This list is OSTree-updateable as well.
+* `SOTA_EXTRA_CONF_FRAGS` - extra https://lxr.missinglinkelectronics.com/uboot/doc/uImage.FIT/overlay-fdt-boot.txt[configuration fragments] for FIT image.
 
 == Usage