MultiSkuDistinctionPei

Field	Value
Index	419
Module	MultiSkuDistinctionPei
Size	2,724 bytes (PE32 .text: 1,103 / .rdata: 804 / .data: 89 / .reloc: 56)
Phase	PEI
Functions	~19

Overview

MultiSkuDistinctionPei detects the platform SKU (Stock Keeping Unit) during early PEI by reading CMOS register 0x4A and querying a GUID-extended HOB for CrystalRidge SKU data. It installs the appropriate PPI to inform downstream PEIMs which SKU variant is active, enabling them to adapt their initialization behavior accordingly.

Key Functions

SkuDetectionEntry -- Main entry: reads CMOS and HOB data to determine SKU
InstallDefaultSkuPpi -- Installs PPI for the default (non-specific) SKU path
InstallActiveSkuPpi -- Installs PPI when a specific SKU sentinel is detected (0x55)
GetCrystalRidgeSkuData -- Queries CrystalRidge HOB for extended SKU info

Dependencies

CMOS RTC (ports 0x70/0x71)
PEI Services (PeiServices)
CrystalRidge HOB GUID
PPI notification mechanism

Platform

Architecture: IA32 (x86, PE32)
Subsystem: EFI Boot Service Driver (0x000B)
Machine: 0x014C (i386)
Entry Point: 0x320