@@ -360,6 +360,65 @@ user variables:
```
+# Building and testing the CIP Core image for Delta Software Update
+
+Set up `kas-container` as described in the [top-level README](../README.md), and then proceed with the following steps.
+
+First build an image using the following command:
+```
+host$ ./kas-container build kas-cip.yml:kas/board/qemu-amd64.yml:kas/opt/ebg-swu.yml:kas/opt/rt.yml
+```
+The above image will be used as the base image to which the update is applied.
+
+## Delta Software Update using rdiff_image handler
+
+Creating an delta update file for rdiff_image handler requires a reference artifact (against which the delta is computed). In this case, the image built in the previous section can be used as the reference artifact. By default the `DELTA_UPDATE_TYPE` is set to `rdiff` and `DELTA_RDIFF_REF_IMAGE` is set to the name `${IMAGE_FULLNAME}.squashfs` (or ${IMAGE_FULLNAME}.verity in the case of Secure boot enabled image). The values of `DELTA_UPDATE_TYPE` and `DELTA_RDIFF_REF_IMAGE` can be changed in the `swupdate.yml` file.
+
+The build system looks for the reference artifact in a directory named `previous-image` in the build directory used for the build process.
+
+Copy the reference artifact to the mentioned directory with the following commands:
+```
+mkdir -p build-v2/previous-image
+cp build/tmp/deploy/images/qemu-amd64/cip-core-image-cip-core-bookworm-qemu-amd64.squashfs build-v2/previous-image
+```
+Build the second image with `build-v2` as the build directory with the following command:
+```
+KAS_BUILD_DIR=build-v2 ./kas-container build kas-cip.yml:kas/board/qemu-amd64.yml:kas/opt/ebg-swu.yml
+```
+Now start the first image. Run the following commands:
+```
+host$ DISTRO_RELEASE=bookworm SWUPDATE_BOOT=y ./start-qemu.sh amd64
+```
+Copy `cip-core-image-cip-core-bookworm-qemu-amd64-delta.swu` file from `build-v2/tmp/deploy/images/qemu-amd64/` folder into the running system:
+```
+host$ cd build-v2/tmp/deploy/images/qemu-amd64/
+host$ scp -P 22222 ./cip-core-image-cip-core-bookworm-qemu-amd64-delta.swu root@localhost:
+```
+
+## Delta Software Update using delta handler
+
+Currently zchunk based delta updates are supported only in Sid images. Make sure to build the first image with Sid as the distribution (use `sid.yml` file as part of the build command).
+For Delta update with zchunk, set the variable `DELTA_ZCK_URL` with the URL of the zck file that is hosted in a http server and set the `DELTA_UPDATE_TYPE` to `zchunk` in `swupdate.yml` file.
+
+Build the second image with the modification as shown above with the following command:
+```
+KAS_BUILD_DIR=build-v2 ./kas-container build kas-cip.yml:kas/board/qemu-amd64.yml:kas/opt/ebg-swu.yml:kas/opt/sid.yml
+```
+Now start the first image. Run the following commands:
+```
+host$ DISTRO_RELEASE=sid SWUPDATE_BOOT=y ./start-qemu.sh amd64
+```
+Copy `cip-core-image-cip-core-sid-qemu-amd64-delta.swu` file from `build-v2/tmp/deploy/images/qemu-amd64/` folder into the running system:
+```
+host$ cd build-v2/tmp/deploy/images/qemu-amd64/
+host$ scp -P 22222 ./cip-core-image-cip-core-sid-qemu-amd64-delta.swu root@localhost:
+```
+The `cip-core-image-cip-core-sid-qemu-amd64.zck` file must be hosted in a http server.
+
+### Delta Software Update Verification
+
+Follow the steps mentioned in the section [SWUpdate verification](#swupdate-verification) for verification.
+
# Building and testing the CIP Core image for BBB
Follow the steps mentioned in the section [Building and testing the CIP Core image](README.swupdate.md#building-and-testing-the-cip-core-image) for creating images and .swu files.
This change includes steps to verify Delta Software Update with rdiff_image and delta handler Signed-off-by: Adithya Balakumar <Adithya.Balakumar@toshiba-tsip.com> --- doc/README.swupdate.md | 59 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+)