What is UEFI Driver Model?
Quick note explaining UEFI Driver Model for BIOS/UEFI and embedded firmware readers.
The UEFI Driver Model defines how drivers test, start, and stop controller support through Driver Binding Protocol functions.
Why it matters
- Explains the core language used in BIOS/UEFI source and logs.
- Helps identify where a concept appears in the boot flow.
- Serves as a bridge between specification terms and real firmware debugging.
Practical example
Example: when reading a boot log, search for UEFI Driver Model-related messages and note which phase produced them before jumping into source code.
Quick checklist
Quick takeaway
UEFI Driver Model is a small concept, but it often becomes important when reading logs or debugging real firmware.
Put it into the system flow
I try not to treat UEFI Driver Model as a dictionary entry. I read it as part of a firmware path: who produces it, who consumes it, and what symptom appears when it is wrong. That habit makes the note useful during debugging, not only during study.
A practical picture
Most firmware concepts become clearer when placed in the right phase. PEI, DXE, BDS, and runtime code have different responsibilities. For UEFI Driver Model, I would ask which module creates it, which protocol/PPI/HOB or variable carries it, and which later component depends on it.
In a real debugging session
For UEFI Driver Model, I usually ask four questions: which firmware phase sees it, which module produces it, which module consumes it, and where the symptom appears when it is wrong. That turns a BIOS/UEFI definition into a useful debug checkpoint.
When a DXE driver does not bind or BDS stops at an unexpected point, avoid staring at one error line only. Walk backward through protocols, handles, device paths, variables, and policy decisions. Firmware failures are usually chained.
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 Handle Database?
Public references
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