Differences between EDK and EDK II
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The main differences are in build architecture. The build description files (.dsc .inf, etc) have been enhanced. The EDK II build can understand EDK build description files, so an EDK II build can include EDK source code (with limitations). There are also build tool differences: EDK II supports a larger number of operating systems and tool chains.
EDK II has richer libraries (MDELIB, etc.), which makes the source code structure very different. EDK II also uses a package concept, so that the directory and file layout is different.
EDK II provides compatibility with EDK-style source code using EdkCompatiblityPkg (ECP). However, ECP support is being deprecated in current platforms. This is possible because ECP provides binary compatibility for EDK through libraies and thunk code.
EDK II is also designed to work with Doxygen to generate design level specifications.
In addition, since EDK II supports later versions of the UEFI and PI Specifications, there are newer protocols that will be part of EDK II that do not exist in EDK.
The Platform Initialization boot execution phases are similar. EDK and EDK II have a similar boot (SEC-PEI-DXE-TSL) and runtime flow. Protocol interfaces supported in both EDK and EDK II will be the same. EDK II can include EDK source code though the use of ECP.
The following table is a side by side comparison.
|Development OS||WinXP||WinXP/7/8/8.1/10, Linux, OS/X|
|Compiler/Linker||VS2003, VS2005, WinDDK||VS2003, VS2005, VS2008, VS2010, VS2013, VS2015, WinDDK, Intel, GCC4, GCC5, LLVM/CLANG|
|Build Tools||C||POSIX C, Python|
|Target Platforms (open source)||NT32, DUET,||See EDK II Platforms|
|Distribution||ZIP Files – Entire Tree Packages with XML metadata||
|Standards (UEFI)||EFI 1.10, UEFI 2.0, UEFI 2.1, Intel Framework, PI 1.0||Focus on UEFI 2.3+/PI 1.2+ Spec Updates. Includes Support for EFI 1.10, UEFI 2.0+, PI 1.0+ & Intel Framework. See UDK2017 release notes for info.|
|Library||binary .Lib files||
Library Classes/Library Instances
Platform Configuration Database
The release notes will have a general summary of features and fixes for EDK II changes. See UDK2017 for the latest stable release and release notes.
EDK II does not use that model.