1.22 May, 2010 v
Contents
1
Introduction..................................................................................................... 1
1.1 Overview ........................................................................................................................... 1
1.2 Target Audience................................................................................................................ 1
1.3 Related Information........................................................................................................... 1
1.4 Terms................................................................................................................................ 2
1.5 Conventions Used in this Document................................................................................. 5
1.5.1 Data Structure Descriptions .................................................................................. 5
1.5.2 Pseudo-Code Conventions ................................................................................... 6
1.5.3 Typographic Conventions ..................................................................................... 6
2
Design Discussion ......................................................................................... 9
2.1 Reference Implementation: UEFI & PI formats................................................................. 9
2.2 Development Environments.............................................................................................. 9
2.2.1 Reference Implementation: Build process restrictions .......................................... 9
2.3 UEFI/PI Firmware Images................................................................................................. 9
2.4 Boot Sequence ...............................................................................................................11
2.4.1 Security (SEC) .................................................................................................... 12
2.4.2 Pre-EFI Initialization (PEI)................................................................................... 12
2.4.3 Drive Execution Environment (DXE) ................................................................... 13
2.4.4 Boot Device Selection (BDS) .............................................................................. 13
2.4.5 Transient System Load (TLS) and Runtime (RT)................................................ 13
2.4.6 After Life (AL) ...................................................................................................... 13
2.5 Typical Flash Part Layout ............................................................................................... 13
2.6 Generic Build Process .................................................................................................... 16
2.6.1 EFI SECTION Files ............................................................................................. 17
2.6.2 Firmware Files..................................................................................................... 18
2.6.3 Firmware Volumes .............................................................................................. 20
2.6.4 Special Files - VTF & BSF .................................................................................. 22
2.6.5 EFI_FV_FILETYPE_SECURITY Notes .............................................................. 22
2.6.6 EFI_FV_FILETYPE_PEI_CORE Notes .............................................................. 22
2.6.7 EFI_FV_FILETYPE_PEIM Notes........................................................................ 23
2.6.8 EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER Notes................................... 23
2.6.9 DXE, BDS, TLS and AL Notes............................................................................ 23
2.7 Creating EFI Images ....................................................................................................... 24
2.7.1 Compiling Code................................................................................................... 24
2.7.2 Creating a Terse Image ...................................................................................... 24
2.7.3 Removing reloc sections..................................................................................... 25
2.7.4 Generating LEAF EFI_SECTION Files ............................................................... 26
2.7.5 Generating Encapsulation EFI_SECTION Files.................................................. 28
2.7.6 Generating DEPEX EFI_SECTION Files ............................................................ 28
2.7.7 Generating Visual Forms (IFR - HII) Files........................................................... 29
2.7.8 Generating EFI FFS Files ................................................................................... 30
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