UEFI Boot Manager

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UEFI Curriculum

About UEFI

UEFI-Framework Course Contents

Introduction to PC Architecture

Beyond BIOS

UEFI Introduction

UEFI Architecture and Technical Overview

UEFI Application

UEFI Shell

UEFI Boot Manager

UEFI Services

UEFI Drivers

Framework Architecture and Technical Overview



Potential research topics


• Boot Manager Function
• Operational Model Boot Manager
• Summary


Boot Manager Function

Boot Manager Function

• Controls boot order and location of all operating systems and EFI applications in the system

• Configuration and maintenance of preboot firmware, that is:

–EFI applications and operating system installation and location

–EFI drivers’ location in the system

–Boot manager options (typically stored in NVRAM)

–NVRAM maintenance menus

–Hardware diagnostics and test

–Flash update

Boot Manager Policy

• It executes policy for ordering EFI boot devices; it is an EFI application that is packaged with the core

• It is the only interface the end user should see

• An example boot manager in the EFI core source is on the web site; boot policy is not specified! (OEM value add)

• It uses EFI NVRAM (flash) to store paths and boot order (specified requirement)

• OEM should customize the boot manager for the look and feel, as well as for security

• For production, boot straight to the operating system

–You do not need to use built-in shell or startup.nsh

• The shell is typically included in most EFI systems as a boot option (but not required); it might vary between different builds and system to system

Operational Model Boot Manager

Operational Model Boot Manager

Sample Boot Manager

• Functionally replaces legacy BIOS Boot Specification (BBS)

• Order of processing load options

–Driver order options
     •        Load any drivers specified in driver option list
–Check the Boot Next feature
     •        This feature is for operating system setup; so
that, on the next boot, this option is selected once
and then removed from the list
–Boot option list
     •        See the next slide for an example case of options
that are stored in NVRAM with boot maintenance menu 

• The web site is: http://developer.intel.com/technology/efi

Process Driver Option List

Boot Option List Example



• EFI Boot Manager

–Boot option control – add, del, change order

–Boot to a file – Transfer control to .EFI file

–Auto timeout


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