Firmware API core features

The firmware API has a rich set of core features available. This section documents these 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
  • EFI embedded firmware fallback mechanism
    • Example how to check for and extract embedded firmware
• Firmware lookup order
• Firmware Guidelines