Linux Firmware API

• Introduction
  • Types of firmware requests
• Firmware API core features
  • Firmware search paths
  • Built-in firmware
  • Firmware cache
  • Direct filesystem lookup
    • Firmware and initramfs
  • Fallback mechanisms
    • Justifying the firmware fallback mechanism
    • Types of fallback mechanisms
    • Firmware sysfs loading facility
      • firmware_fallback_sysfs
    • Firmware kobject uevent fallback mechanism
    • Firmware custom fallback mechanism
    • Firmware fallback timeout
  • Firmware lookup order
• request_firmware API
  • Synchronous firmware requests
    • request_firmware
    • firmware_request_nowarn
    • request_firmware_direct
    • request_firmware_into_buf
  • Asynchronous firmware requests
    • request_firmware_nowait
  • Special optimizations on reboot
    • firmware_request_cache()
  • request firmware API expected driver use
• Other Firmware Interfaces
  • DMI Interfaces
  • EDD Interfaces