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Benefits of Kirkstone:

• There are 93 Security Fixes
• Components where security fixes are added :- binutils, curl, epiphany, expat, ffmpeg, gcc, glibc, gmp, go, grub2, gzip, libarchive, libxml2, libxslt, lighttpd, linux-yocto, amdgpu, lua, openssl, qemu , rpm , seatd , speex , squashfs-tools , systemd , tiff , unzip , vim , virglrenderer , webkitgtk , xz , zlib
• There are 318 opensource component version upgrades
• Major opensource upgrades (Dunfell → Kirkstone) are :- GCC (9.3 → 11.3) , glibc (2.31 → 2.35) , glib-2.0 (2.62.4 → 2.72.3), systemd (244.3 → 250.5) , busybox (1.31.1 → 1.35.0)
• Netflix upgrade, youtube
• GCC compiler
• clang compiler, C++ 17 
• Maintainability - Dunfell 4 years ; Kirkstone 2 years ; CVE Dunfell is sill open (Refer Yocto mailing list), Upstream dunfell 3.1.24 has open CVE
• Build time - reduce number of default dependency (make build faster in first/second time)
• meta-rust is in core
• software bill of material (security infrastructure)
• share state - c standard. faster sstsate performance due to decompression standard cstd (twice faster than xz)
• license management tool improvement (more accurate license compliance)
• Kirkstone need minimum 4.x kernel (refer systemd)
• linux_kernel_header does not mandate

Reference :- https://docs.yoctoproject.org/migration-guides/release-notes-4.0.html 

Kirkstone build instructions for RPI4-32 

 The following commands fetches the source code of Rpi4-32 using repo tool

repo init -u https://code.rdkcentral.com/r/manifests -b feature-kirkstone -m rdkb-extsrc.xml
repo sync --no-tag
MACHINE=raspberrypi4-rdk-broadband source meta-cmf-raspberrypi/setup-environment
bitbake core-image-minimal

Kirkstone build instructions for RPI4-64

 The following commands fetches the source code of Rpi4-64 using repo tool

repo init -u https://code.rdkcentral.com/r/manifests -b feature-kirkstone -m rdkb-extsrc.xml
repo sync --no-tag
MACHINE=raspberrypi4-64-rdk-broadband source meta-cmf-raspberrypi/setup-environment
bitbake rdkb-generic-broadband-image

Kirkstone (Yocto 4.0) - User Stories :

RDK-B RPI4 64 bit:

RDK-B RPI4 32 bit:

Migration Efforts:

Kirkstone (Yocto 4.0) can be built using Ubuntu 18.04, 20.04 or 22.04 VMs. All these variants need additional packages to be installed over the vanilla version.

To tackle the build issues from moving one version to another, we have decided to split the problem into different subtasks. So instead of building a complete image at one go, we have planned for the generation of the following images:

• core-minimal-image 
• rdk-generic-broadband-image

These images need to be tested in cmf, to ensure that nothing has broken the existing system.

In order to provide a smooth transition without disturbing the existing branch, we have created a branch called `feature-kirkstone` for non-OE layers and another branch called `rdk/kirkstone` for OE layers and  bitbake.

The Kirkstone specific OE layers:

• Openembedded-core
• Bitbake
• Meta-openembedded
• Meta-virtualization
• Meta-java
• Meta-clang
• Meta-python2
• Meta-gplv2

The machine configuration shall have a distro defined “Kirkstone”

Note: A detailed migration steps will be update before March 02,2023 

Additional information for building a project:

   Will be update before March 02,2023.Docker file will also be provided