AST2500PeiInit

Overview

This PEIM initializes the AST2500 (ASPEED) Super I/O and GPIO configuration during the PEI phase. It probes the AST2500 SIO via PM I/O ports (0x72/0x73), detects the SIO ID, and programs GPIO configuration registers accordingly. The module handles both AST2500 (SIO ID 0x21) and non-AST2500 SIO variants using separate GPIO configuration tables.

Key Functions

• Ast2500PeiInitEntry -- Main entry point; probes SIO, selects GPIO table, programs registers
• AstSioReadPmReg / AstSioWritePmReg -- SIO PM register access via ports 0x72/0x73
• AstPciCfgRead16 / AstPciCfgWrite16 -- PCI configuration space access via CF8/CF9
• AstGpioCfgProgram -- Programs a single GPIO port with AND/OR masks
• AstPciCfgProgramBar -- Programs PCI BAR for the AST2500 SCU register space

Dependencies

• edk2 BaseIoLibIntrinsic (IoLibMsc.c, IoLib.c)
• edk2 BasePciCf8Lib (PciCf8Lib.c)
• edk2 PeiServicesTablePointerLibIdt
• edk2 BaseLib (X86ReadIdtr.c)

Platform

• Architecture: IA32 (32-bit)
• Machine type: x86 (0x014C)
• Subsystem: EFI Boot Service Driver (0x000B)
• Format: PE32
• Sections: .text, .rdata, .data, .reloc