What is UEFI Runtime Driver?
Quick note explaining UEFI Runtime Driver for BIOS/UEFI and embedded firmware readers.
What is UEFI Runtime Driver?
A UEFI runtime driver keeps code or data available after ExitBootServices().
Why it matters
- Explains how UEFI drivers are structured and connected.
- Helps debug driver binding, controller connection, and resource cleanup.
- Useful when reading Driver Binding Protocol code.
Practical example
Example: if Start() fails halfway, the driver should close protocols and free resources it already allocated before returning the error.
Quick checklist
- Does Supported() match the correct device?
- Does Start() clean up on failure?
- Does Stop() release all resources and close protocols?
Quick takeaway
UEFI Runtime Driver is a small concept, but it often becomes important when reading logs or debugging real firmware.
Related notes
- What is Supported() in UEFI Driver Model?
- What is Start() in UEFI Driver Model?
- What is Stop() in UEFI Driver Model?
- What is UEFI Device Driver?
- What is UEFI Service Driver?
Public references
- UEFI Specification 2.11 — Runtime Services
- UEFI Driver Writer’s Guide
- UEFI Specification 2.11 — UEFI Driver Model
- EDK II Driver sample
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Nội dung liên quan
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What is EFI_BUFFER_TOO_SMALL?
Quick note explaining EFI_BUFFER_TOO_SMALL for BIOS/UEFI and embedded firmware readers.
What is EFI_STATUS?
Quick note explaining EFI_STATUS for BIOS/UEFI and embedded firmware readers.
What is Supported() in UEFI Driver Model?
Quick note explaining Supported() in UEFI Driver Model for BIOS/UEFI and embedded firmware readers.
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