What is DEPEX?
Quick note explaining DEPEX for BIOS/UEFI and embedded firmware readers.
What is DEPEX?
DEPEX is an EDK II build or module concept used to organize firmware source, metadata, dependencies, or platform configuration.
Why it matters
- Explains EDK II source and build metadata.
- Helps debug build, library resolution, and image-packaging issues.
- Useful when moving from embedded C to UEFI development.
Practical example
Example: when a module builds but does not appear in the final image, check both DSC inclusion and FDF/FV placement.
Quick checklist
- Is the module listed in the correct DSC?
- Is it placed in the expected FV through FDF?
- Are library classes, packages, PCDs, and DEPEX resolved correctly?
Quick takeaway
DEPEX is a small concept, but it often becomes important when reading logs or debugging real firmware.
Related notes
Public references
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