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Shenglei Zhang 501de8146d UefiCpuPkg/Cpuid: Add description for parameter LeafFunction 3 days ago
ArmPkg ArmPkg: DebugPeCoffExtraActionLib: fix trivial comment typos 2 weeks ago
ArmPlatformPkg ArmPlatformPkg: list module-internal header files in INF [Sources] 3 weeks ago
ArmVirtPkg ArmVirtPkg: handle NETWORK_TLS_ENABLE in ArmVirtQemu* 1 month ago
BaseTools BaseTools/Capsule: Tool to generate Windows Firmware Update Driver 3 days ago
Conf BaseTools:Delete FrameworkDatabase from BaseTools/Conf 3 months ago
CryptoPkg CryptoPkg/OpensslLib: Add missing header files in INF file 2 days ago
DynamicTablesPkg DynamicTablesPkg: Disable deprecated APIs 2 months ago
EmbeddedPkg EmbeddedPkg: list module-internal header files in INF [Sources] 3 weeks ago
EmulatorPkg EmulatorPkg/Unix/Host: Fix XCODE5 IA32/X64 build failure 1 week ago
FatPkg FatPkg/FatPei: Remove BootInRecoveryMode PPI DEPEX. 3 months ago
FmpDevicePkg FmpDevicePkg/FmpDxe: Remove use of CatSprint() 3 days ago
IntelFsp2Pkg IntelFsp2Pkg/FspSecCore: Add missing header file in INF file 5 days ago
IntelFsp2WrapperPkg IntelFsp2WrapperPkg/FspWrapperNotifyDxe: make global variable static 3 months ago
MdeModulePkg MdeModulePkg/DxeIplPeim: Initialize pointer PageMapLevel5Entry 2 days ago
MdePkg MdePkg/BaseUefiDecompressLib: Add missing description for parameter 5 days ago
NetworkPkg NetworkPkg: Move Dpc.h from MdeModulePkg to NetworkPkg 3 days ago
OvmfPkg OvmfPkg/PlatformPei: Change referenced MSR name. 1 week ago
PcAtChipsetPkg PcAtChipsetPkg: Remove framework modules 1 month ago
SecurityPkg SecurityPkg/SecurityPkg.uni: Add missing strings for new PCDs 2 days ago
ShellPkg ShellPkg/UefiShellAcpiViewCommandLib: Initialize local variables 2 days ago
SignedCapsulePkg SignedCapsulePkg: Update Package DSC to remove unused network libs 2 months ago
SourceLevelDebugPkg SourceLevelDebugPkg DebugCommLibUsb3: Address NULL ptr dereference case 6 days ago
StandaloneMmPkg StandaloneMmPkg: Replace BSD License with BSD+Patent License 4 months ago
UefiCpuPkg UefiCpuPkg/Cpuid: Add description for parameter LeafFunction 2 days ago
UefiPayloadPkg UefiPayloadPkg: Remove legacy PIC 8259 driver 1 month ago
.gitignore edk2: Add .DS_Store to .gitignore for macOS 2 years ago
.gitmodules ArmPkg: import Berkeley Softfloat library as git submodule 2 months ago
License-History.txt edk2: Add License-History.txt 4 months ago
License.txt edk2: Change License.txt from 2-Clause BSD to BSD+Patent 4 months ago
Maintainers.txt Maintainers.txt: Fine-grained review ownership for MdeModulePkg 1 month ago add submodule policy and clone commands 3 days ago
edksetup.bat Edk2Setup: Support different VS tool chain setup 1 month ago remove redundant -?, -h and --help in options parsing 3 weeks ago

EDK II Project

A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from

The majority of the content in the EDK II open source project uses a BSD-2-Clause Plus Patent License. The EDK II open source project contains the following components that are covered by additional licenses:

The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.


Code Contributions

To make a contribution to a TianoCore project, follow these steps.

  1. Create a change description in the format specified below to use in the source control commit log.
  2. Your commit message must include your Signed-off-by signature
  3. Submit your code to the TianoCore project using the process that the project documents on its web page. If the process is not documented, then submit the code on development email list for the project.
  4. It is preferred that contributions are submitted using the same copyright license as the base project. When that is not possible, then contributions using the following licenses can be accepted:

For documentation:

Contributions of code put into the public domain can also be accepted.

Contributions using other licenses might be accepted, but further review will be required.

Developer Certificate of Origin

Your change description should use the standard format for a commit message, and must include your Signed-off-by signature.

In order to keep track of who did what, all patches contributed must include a statement that to the best of the contributor’s knowledge they have the right to contribute it under the specified license.

The test for this is as specified in the Developer’s Certificate of Origin (DCO) 1.1. The contributor certifies compliance by adding a line saying

Signed-off-by: Developer Name

where Developer Name is the contributor’s real name, and the email address is one the developer is reachable through at the time of contributing.

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

Sample Change Description / Commit Message

From: Contributor Name <>
Subject: [Repository/Branch PATCH] Pkg-Module: Brief-single-line-summary


Signed-off-by: Contributor Name <>

Notes for sample patch email

  • The first line of commit message is taken from the email’s subject line following [Repository/Branch PATCH]. The remaining portion of the commit message is the email’s content.
  • git format-patch is one way to create this format

Definitions for sample patch email

  • Repository is the identifier of the repository the patch applies. This identifier should only be provided for repositories other than edk2. For example edk2-BuildSpecification or staging.
  • Branch is the identifier of the branch the patch applies. This identifier should only be provided for branches other than edk2/master. For example edk2/UDK2015, edk2-BuildSpecification/release/1.27, or staging/edk2-test.
  • Module is a short identifier for the affected code or documentation. For example MdePkg, MdeModulePkg/UsbBusDxe, Introduction, or EDK II INF File Format.
  • Brief-single-line-summary is a short summary of the change.
  • The entire first line should be less than ~70 characters.
  • Full-commit-message a verbose multiple line comment describing the change. Each line should be less than ~70 characters.
  • Signed-off-by is the contributor’s signature identifying them by their real/legal name and their email address.


Submodule in EDK II is allowed but submodule chain should be avoided as possible as we can. Currently EDK II contains two submodules

  • CryptoPkg/Library/OpensslLib/openssl
  • ArmPkg/Library/ArmSoftFloatLib/berkeley-softfloat-3

The latter one is actually required by previous one. It’s inevitable in openssl-1.1.1 (since stable201905) for floating point parameter conversion, but should be dropped once there’s no such need in future release of openssl.

To get a full, buildable EDK II repository, use following steps of git command

$ git clone
$ cd edk2
$ git submodule update --init
$ cd ..

If there’s update for submodules, use following git commands to get the latest submodules code.

$ cd edk2
$ git pull
$ git submodule update

Note: When cloning submodule repos, ‘--recursive’ option is not recommended. EDK II itself will not use any code/feature from submodules in above submodules. So using ‘--recursive’ adds a dependency on being able to reach servers we do not actually want any code from, as well as needlessly downloading code we will not use.