What is DEPEX Section?
Quick note explaining DEPEX Section for BIOS/UEFI and embedded firmware readers.
What is DEPEX Section?
DEPEX Section is a firmware-image concept used to understand ROM layout, firmware volumes, files, sections, or flash storage.
Why it matters
- Explains how firmware is packaged into ROM/flash images.
- Helps debug missing modules, wrong FV placement, and section layout problems.
- Connects build output with what actually runs on the board.
Practical example
Example: a DXE driver may compile successfully but never run if it was not placed into the correct Firmware Volume.
Quick checklist
- Is the file/module present in the expected FV?
- Are FFS sections and DEPEX valid?
- Does the final ROM layout match the intended flash layout?
Quick takeaway
DEPEX Section helps connect build output with the final ROM image layout.
Related notes
Public references
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