UEFI Industry Organization¶
UEFI is the industry standards body that develops and distributes the UEFI, PI, and ACPI specifications. These specifications govern the firmware interfaces between OS, OEM/Device Manufacturer, and Silicon partner. This is a great site to download the industry specifications and if you are a member you can join working groups for future specifications.
Tianocore is an existing open source project. Their EDK2 repository is the basis for many/most UEFI implementations used on products today. It provides UEFI spec compliant code modules, supports industry standard hardware, and a multi-platform build environment. This is a great site to download specifications for the different file types and build process. It also has links to repositories that Project Mu tracks as "upstreams".
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