The database is populated using the OpenCL Hardware Capability Viewer application, available for multiple platforms. It reads and displays OpenCL related information for a selected implementation, and that data can then be uploaded to the database. The OpenCL Hardware Capability Viewer is a free open source product and the sources are always available from this github repository.
Please note: The first release is considered a beta version and may contain bugs and errors. If you encounter any problems, please report them at the github repository.