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Overview

  • Feature Name: Logo
  • PI Phase(s) Supported: DXE
  • SMM Required? No

Purpose

This feature provides the Logo image and driver that produces EDKII_PLATFORM_LOGO_PROTOCOL:

  1. LogoDxe.inf includes a BMP logo in the EFI file, the driver provides the image via EDKII_PLATFORM_LOGO_PROTOCOL.
  2. JpegLogoDxe.inf includes a JPEG logo in the EFI file, the driver uses EFI_HII_IMAGE_DECODER_PROTOCOL to decode the JPEG file and provide the image via EDKII_PLATFORM_LOGO_PROTOCOL.

High-Level Theory of Operation

The driver produces a EDKII_PLATFORM_LOGO_PROTOCOL to provide a logo picture shown on setup screen.

The Logo file is built in HII package list as EFI resource, the driver uses EFI_HII_DATABASE_PROTOCOL to the publish HII package list to HII Database and get images via EFI_HII_IMAGE_EX_PROTOCOL.

Firmware Volumes

  • PostMemory

Modules

A bulleted list of the modules that make up the feature.

  • LogoDxe
  • JpegLogoDxe

LogoDxe

This driver provides a bitmap image via EDKII_PLATFORM_LOGO_PROTOCOL.

JpegLogoDxe

This driver uses EFI_HII_IMAGE_DECODER_PROTOCOL to decode the jpeg data and provide a bitmap image via EDKII_PLATFORM_LOGO_PROTOCOL.

Key Functions

  • This feature produces a EDKII_PLATFORM_LOGO_PROTOCOL which could be used by consumer such as Edk2\MdeModulePkg\Library\BootLogoLib.

Configuration

  • gLogoFeaturePkgTokenSpaceGuid.PcdLogoFeatureEnable TRUE: Enable logo feature FALSE: Disable logo feature
  • gLogoFeaturePkgTokenSpaceGuid.PcdJpgEnable TRUE: Use jpeg logo FALSE: Use bitmap logo

Data Flows

Architecturally defined data structures and flows for the feature.

Data flows of LogoDxe

| Consumer |    | LogoFeatruePkg |    |HiiDatabaseDxe|
------------    ------------------    ----------------
      |                 |                     |
      |                 |--bitmap image data->|
      |<---bitmap data--|<-return bitmap data-|

Data flows of JpegLogoDxe

| Consumer |    | LogoFeatruePkg |    |HiiDatabaseDxe|    | EFI_HII_IMAGE_DECODER_PROTOCOL |
------------    ------------------    ----------------    ----------------------------------
      |                 |                     |                            |
      |                 |---Jpeg Image data-->|---------decode Jpeg------->|
      |<---bitmap data--|<-return bitmap data-|<-----return bitmap data----|

Control Flows

Consumer gets image from the logo driver via EDKII_PLATFORM_LOGO_PROTOCOL.

Build Flows

No any special build flows is needed.

Test Point Results

Not available.

Functional Exit Criteria

  • Check wether EDKII_PLATFORM_LOGO_PROTOCOL->GetImage() return a default Intel logo.
  • If using jpeg logo, a dex driver which produces EFI_HII_IMAGE_DECODER_PROTOCOL(name is gEfiHiiImageDecoderNameJpegGuid) is necessary, it is used to decode Jpeg data.

Feature Enabling Checklist

Option 1

  • Include AdvancedFeatures.dsc in platform dsc file, and use pcd to enable the feature.
  gLogoFeaturePkgTokenSpaceGuid.PcdLogoFeatureEnable                      |TRUE
  gLogoFeaturePkgTokenSpaceGuid.PcdJpgEnable                              |FALSE
  !include Include/AdvancedFeatures.dsc
  • Include PreMemory.fdf and inPostMemory.fdf in platform fdf file
!include Include/PreMemory.fdf
!include Include/PostMemory.fdf

Option 2

  • To use bitmap logo, include "LogoFeaturePkg/LogoDxe/LogoDxe.inf" in platform dsc file, and include "INF LogoFeaturePkg/LogoDxe/LogoDxe.inf" in platform fdf file.

  • To use jpeg logo, include "LogoFeaturePkg/LogoDxe/JpegLogoDxe.inf" in platform dsc file, and include "INF LogoFeaturePkg/LogoDxe/JpegLogoDxe.inf" in platform fdf file.

Performance Impact

  • LogoDxe
  • EFI size: 180 KB

  • Time spent in EDKII_PLATFORM_LOGO_PROTOCOL->GetImage(): about 18 milliseconds

  • JpegLogoDxe

  • EFI size: 13.6 KB
  • Time spent in EDKII_PLATFORM_LOGO_PROTOCOL->GetImage(): about 80 milliseconds