1. RDK Migration to Yocto/OE
Lessons Learned
Khem Raj
Sanjay Dorairaj
February 13th 2015

2. Topics RDK Overview RDK Software Stack Legacy Build Framework
Challenges with the legacy build framework
Moving to Yocto/OE – What was involved?
Challenges with Yocto/OE
Tools
Coming Soon…

3. RDK Overview RDK – Reference Design Kit for set-tops
Development started in 2012
Managed by RDK-LLC and licensed to a community of close to 200 members
Linux based software stack
Platform for the Comcast X1 experience and deployed on more than 5 million set-tops

4. RDK Software Stack

5. Motivation & Technical Aspects of the legacy build framework
Orchestration framework to build RDK-based binary distributions
Component level build scripts
Allow for strict access control policies at multiple granularities
Separation of fetch & build processes
Technical aspects
Written using Python
SVN/Git using Gclient
Nexus Repository for binary artifacts

6. Legacy build framework

7. Challenges with legacy build system
Scalability
Maintainability
Standards Compliance
Build consistency
Build performance
Collaboration
Documentation & Knowledge base
Proven build system
Common framework

8. Move to Yocto/OE - What was involved?
Layered Architecture
Repository Structure
Repo integration
Autotools/Bitbake Migration
Binary Management
sstate cache
Component refactoring
Development workflow
Release workflow
Firmware nomenclature
Code size optimization
Training & Documentation

9. Challenges with Yocto/OE
Developer workflow
Resource intensive
Enhanced prebuilt support
Paradigm shift in development – bitbake, Git, patch management
Adoption challenges
Upstreaming
Component Yocto’ization

10. Tools Git/Gerrit Integration Nexus Repository for binary management
Jenkins for build orchestration
RDK Portal – centralized dashboard and build status aggregator
Cache – sstate/opensource
AWS and Openstack server farm
Automated Test and Coverity Integration
Gerrit Dashboard
Changes Management
Release Management

11. Coming soon… Upgrade to Yocto 1.8 Bitbake optimization
Locked sstate support
Workflow refinements
Toaster integration
More architecture support – ARM, MIPS,x86 (aarch64?)
Tools 2.0