What is FFS Section?
Quick note explaining FFS Section for BIOS/UEFI and embedded firmware readers.
What is FFS Section?
An FFS section is a typed sub-part inside an FFS file, such as PE32, UI, RAW, DEPEX, or compression sections.
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
FFS Section helps connect build output with the final ROM image layout.
Related notes
- What is Firmware Volume?
- What is PE32 Section?
- What is DEPEX Section?
- What is TE Image?
- What is SPI Flash in BIOS?
Public references
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