DxeIpmiUsb

Overview

DxeIpmiUsb is a UEFI DXE driver that provides IPMI (Intelligent Platform Management Interface) transport over USB for the Lenovo HR650X platform. The driver discovers USB HID class interfaces with vendor-specific class codes (0xFF/0x01/0x86 per IPMI v2.0) and implements SendIpmiCommand/ReceiveIpmiResponse protocol functions using USB control and interrupt transfers.

The driver allocates an IPMI_USB_DEVICE structure (32 KB), performs a self-test via IPMI Get Device ID, and installs the IPMI transport protocol on the USB handle. IPMI messages are exchanged using USB SET_REPORT/GET_REPORT requests over endpoint 0 and interrupt endpoints for streaming.

Key Functions

• DxeIpmiUsbEntryPoint / _ModuleEntryPoint -- DXE driver entry point
• Supported() -- USB IO protocol handler, checks for IPMI USB class
• Start() -- Allocates device context, discovers endpoints, installs protocol
• SendIpmiCommand -- Sends IPMI command via USB control transfer
• ReceiveIpmiResponse -- Receives IPMI response via USB interrupt transfer
• GetHobList -- Locates HOB list from system table

Dependencies

• UEFI USB IO Protocol
• PCI Express MMIO configuration
• IPMI v2.0 specification (USB HID transport)
• UEFI HOB (Hand-Off Block) list

Platform

Lenovo HR650X (x86_64, PE32+)