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Unified Extensible Firmware Interface
Specification
Version 2.7
May 2017

Unified Extensible Firmware Interface Specification
ii May 2017 Version 2.7
Acknowledgments
The materialContained herein is not a license, either expressly or impliedly, to any intellectual property owned
orControlledBy any of the authors or developers of this material or to anyContribution thereto. The
materialContained herein is provided on an "AS IS"Basis and, to the maximum extent permittedBy applicable law,
this information is provided AS IS AND WITH ALL FAULTS, and the authors and developers of this material hereby
disclaim all other warranties andConditions, either express, implied or statutory, including,But not limited to, any (if
any) implied warranties, duties orConditions of merchantability, of fitness for a particular purpose, of accuracy
orCompleteness of responses, of results, of workmanlike effort, of lack of viruses and of lack of negligence, all with
regard to this material and anyContribution thereto. Designers must not rely on the absence orCharacteristics of any
features or instructions marked "reserved" or "undefined." The Unified EFI Forum, Inc. reserves any features or
instructions so marked for future definition and shall have no responsibility whatsoever forConflicts or
incompatibilities arising from futureChanges to them. ALSO, THERE IS NO WARRANTY ORCONDITION OF TITLE,
QUIET ENJOYMENT, QUIET POSSESSION,CORRESPONDENCE TO DESCRIPTION OR NON-INFRINGEMENT WITH
REGARD TO THE SPECIFICATION AND ANYCONTRIBUTION THERETO.
IN NO EVENT WILL ANY AUTHOR OR DEVELOPER OF THIS MATERIAL OR ANYCONTRIBUTION THERETOBE LIABLE
TO ANY OTHER PARTY FOR THECOST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS
OF USE, LOSS OF DATA, OR ANY INCIDENTAL,CONSEQUENTIAL, DIRECT, INDIRECT, OR SPECIAL DAMAGES
WHETHER UNDERCONTRACT, TORT, WARRANTY, OR OTHERWISE, ARISING IN ANY WAY OUT OF THIS OR ANY
OTHER AGREEMENT RELATING TO THIS DOCUMENT, WHETHER OR NOT SUCH PARTY HAD ADVANCE NOTICE OF
THE POSSIBILITY OF SUCH DAMAGES.
Copyright 2017 Unified EFI Forum, Inc. All Rights Reserved.

Version 2.7 May 2017 iii
Revision History
Revision Mantis Number / Description Date
2.7 1779 Adjusting UEFI version to UEFI 2.7 April 2017
2.7 1771BluetoothLE minor fix April 2017
2.7 1762 UEFI UFS DEVICECONFIG Protocol April 2017
2.7 1751 Update DNS Device Path April 2017
2.7 1750 Add new data type to EFI Supplicant Protocol April 2017
2.7 1745 NVDIMM Label Protocol April 2017
2.7 1744 NVDIMMBlock Translation Table (BTT) Protocol {NewChapter} April 2017
2.7 1730 HII Popup Protocol April 2017
2.7 1726 Host and I/O defense April 2017
2.7 1720 Have Partition driver publish addition information for MBR/GPT
partition types.
April 2017
2.7 1719 Add EFI HTTP Boot Callback Protocol April 2017
2.7 1718 Allow SetData to clear configuration in Ip4Config2/Ip6Config Protocol April 2017
2.7 1716 Add BluetoothLE ECR April 2017
2.7 1711 Firmware Error Record Update April 2017
2.7 1707 Clarification of Private Authenticated Variables April 2017
2.7 1701 Add wildcard support to RegisterKeyNotify April 2017
2.7 1690 Reset Notification Protocol Update April 2017
2.7 1689 Secure Boot with Externally Managed Configuration April 2017
2.7 1685 Key Management Services (KMS) Protocol Enhancement April 2017
2.7 1672 UEFI Variable Enhancements April 2017
2.7 1654 New AIP Information block for wireless NIC April 2017
2.7 1652 Add DNS device path node April 2017
2.7 1647 UEFI binding for RISC-V April 2017
2.7 1641 Simplify SecureBoot Revocation and Usage of VerifySignature April 2017
2.7 1641 Simplify Secure Boot Revocation and Usage of VerifySignature April 2017
2.7 1627 Support ASCII RegEx Patterns in
EFI_REGULAR_EXPRESSION_PROTOCOL
April 2017
2.7 1627 EFI regular expression syntax type definitions April 2017
2.7 1623 New EFI_HTTP_STATUS_CODE enum for 308 Permanent Redirect April 2017
2.7 1623 New EFI_HTTP_STATUS_CODE enum for 308 Permanent Redirect April 2017
2.6B 1772 Clarify EFI_NOT_READY in Media State of AIP April 2017
2.6B 1767 Incorrect structure definition for EFI_IFR_RESET_BUTTON_OP April 2017
2.6B 1742 Clairfy PK enrolling in user mode April 2017
2.6B 1741 The memory map returnedByBS->GetMemoryMap() mayContain
impossible values.
April 2017
2.6B 1739 typos -Broken references link. April 2017

Unified Extensible Firmware Interface Specification
iv May 2017 Version 2.7
2.6B 1729Cleanup of ACPI 2.0 references in UEFI spec April 2017
2.6B 1708 Typos in Imge Decode and Image Ex Protocols April 2017
2.6B 1700 Align ACPI descriptor definitions in PCI I/O and PCI RootBridge I/O April 2017
2.6B 1698 Update to Mantis 1613 - GetNextVariable April 2017
2.6B 1691 Remove/Deprecate SMM Communication ACPI Table April 2017
2.6B 1682 HII Protocol StatusCodes April 2017
2.6B 1678 Simplify the ACPI Table GUID declarations April 2017
2.6B 1675 section 30.5.1 typo April 2017
2.6B 1668 Duplicate GUID issue - mustChange the Image Decoder Protocol GUID April 2017
2.6B 1655 HTTP errata inConfigure() April 2017
2.6B 1653 Incorrect errorCode value in MTFTP6 April 2017
2.6B 1634 Update to the EFI_SIMPLE_TEXT_INPUT_PROTOCOL TPL restriction April 2017
2.6B 1629 Errata in GetVariable description April 2017
2.6B 1625 Clarification of HTTPBoot wire protocol “HTTPClient” VendorClass
Option
April 2017
2.6B 1624 Fix spelling typo in EFI_HTTP_STATUS_CODE April 2017
2.6B 1613 GetNextVariableName Errata April 2017
2.6B 1612 ResetSystem Errata April 2017
2.6B 1609 UEFI Errata - Address Security problems in the Pkcs7Verify Protocol April 2017
2.6B 1608 Enhance EFI_IFR_NUMERIC (Step) April 2017
2.6B 1586 Errors in appendix N for ARM ProcessorContext Information April 2017
2.6B 1584 WIFI errata April 2017
2.6B 1580 Correct some typos April 2017
2.6B 1559 Clarify return value for NULL pointer in LocateProtocol() API April 2017
2.6B 1557 secureBoot and auth variable errata April 2017
2.6B 1556 HTTPv6Boot DHCP Options Errata April 2017
2.6B 1555 USB Function port protocol errata April 2017
2.6B 1554 fix to ecr 1539 April 2017
2.6B 1553 os recoveryBoot option errata April 2017
2.6B 1551 EFIBluetoothConfiguration Protocol Errata April 2017
2.6B 1550 Replace FTP4 dataCallback pointer-to-function-pointer with regular
function pointer
April 2017
2.6A SameContent as version 2.6,But with the Adobe “accessibility” feature
activated so text-to-speech will work.
December 2016
2.6 1548ClarifyBoot procedure when file name is absent2. January, 2016
2.6 1547Clarify requirements for setting the PK variable. January, 2016
2.6 1544 DNS lookup API spelling January, 2016
2.6 1543 ip4/6Config policy errata/2.6 update January, 2016
2.6 1542 UEFI 2.6 supplicant errata January, 2016
2.6 1539 New EFI_HTTP_ERROR StatusCode December, 2015
Revision Mantis Number / Description Date

Version 2.7 May 2017 v
2.6 1538 UEFI TLS errata December, 2015
2.6 1536 UEFI 2.6 Errata : IMAGE EX Protocol and EFI HII Image Decoder protocol
Errata
December, 2015
2.6 1534 EditorialComments against 2.6 Final Draft December, 2015
2.6 1533Bugs in the HTTP usage example December, 2015
2.6 1523Comments against 2.6 Draft December, 2015
2.6 1522 AArch64Bindings AlignmentBit errata December, 2015
2.6 1521Comment against UEFI.next draft - M1479 December, 2015
2.6 1519 Version for the next UEFI spec is... December, 2015
2.6 1518Comments against 2.6 Draft December, 2015
2.6 1516 EditorialComments against 2.6 Draft December, 2015
2.6 1509 EFI_PLATFORM_TO_DRIVER_CONFIGURATION_PROTOCOL Response
to unsupported ParameterTypeGuid
December, 2015
2.6 1508 Lack of flexibility and realism in exception levelChoice whenCalling
runtime services
December, 2015
2.6 1507 Insufficient qualification of page attributes for AArch64 December, 2015
2.6 1502 PCI IO Define how to use the Address Translation Offset for systems that
are not mapped 1:1
November, 2015
2.6 1501 Define the usage of the "Address Space Granularity" field is defined in
the PCI Root IO
November, 2015
2.6 1496Bad table reference in 13.2
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.Configuration()
November, 2015
2.6 1494 Errata against UEFI 2.5 Properties Table November, 2015
2.6 1493 Updates to the SD_MMC_PASS_THRU interface November, 2015
2.6 1492 wireless macConnection protocol II errata November, 2015
2.6 1491 supplicant errata November, 2015
2.6 1480 Refine Progress description in EFI_KEYWORD_HANDLER_PROTOCOL November, 2015
2.6 1479 UEFI Properties TableClarification November, 2015
2.6 1471 SD/eMMC PassThru Protocol update (follow up to mantis 1376) November, 2015
2.6 1467 New API - EFI_WIRELESS_MAC_CONNECTION_II_PROTOCOL November, 2015
2.6 1466 UEFI Ram disk protocol November, 2015
2.6 1452 Minor edits to 0001409 November, 2015
2.6 1414 Generalisation ofCommunication method in Appendix O November, 2015
2.6 1409 EFI HII ImageEX protocol and EFI HII Image Decoder protocols November, 2015
2.6 1408 EFI HII Font EX protocol and EFI HII Font Glyph Generator protocols November, 2015
2.6 1402 Add EFI_BROWSER_ACTION_SUBMITTED November, 2015
2.6 1383 Adding an EraseBlocks() function to a new protocol November, 2015
2.6 1376 SD/eMMC PassThru Protocol November, 2015
2.6 1357 ARMCPER extensions November, 2015
2.5A 1481 new networkConfig2 protocol data structure has a magic number October 2015
2.5A 1477 AllowCloseEvent toBeCalled within the Notification Function October 2015
Revision Mantis Number / Description Date
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