FlashDriver

FlashDriver is a UEFI DXE Runtime Driver from AmiModulePkg that manages SPI flash programming for BIOS flash chips. It detects flash devices, maps them to MMIO, and provides a protocol interface for read, write, and erase operations. The driver handles virtual address change notifications for runtime services, manages PCIe segment/bus caching, and implements SPI flash command sequencing including the Spinel communication protocol.

Key Functions

• ModuleEntryPoint -- UEFI entry point; dispatches to FlashDriverInit
• FlashDriverInit -- Driver initialization; detects SPI flash controllers and enumerates flash devices
• FlashDriverEntry -- Registers the flash protocol interface
• FlashDriverUnload -- Driver unload handler; cleans up flash protocol registration
• FlashProtocolInstall -- Installs the flash protocol on a new handle
• FlashSpinelHandler -- Processes SPI Spinel protocol commands for flash status/control
• FlashVirtualAddressNotify -- Handles virtual address mapping change for runtime services
• FlashFreePciExpressMmio -- Releases PCI Express MMIO allocations

Dependencies

• UEFI Boot Services (gBS)
• UEFI Runtime Services (gRT)
• DXE Services (gDS)
• PCI Express MMIO Base
• SPI Flash Protocol
• Flash Region Table (descriptor-based flash layout)
• Spinel Protocol

Platform

• Format: PE32+
• Machine: x86-64
• Subsystem: EFI Runtime Driver (0x0C)
• Sections: .text, .rdata, .data, section_3, .xdata, .reloc
• Source: AmiModulePkg\FlashDriver
• Build: VS2015 DEBUG, X64