What is GrayOutIf?
Quick note explaining GrayOutIf for BIOS/UEFI and embedded firmware readers.
What is GrayOutIf?
GrayOutIf is part of the UEFI HII and BIOS Setup infrastructure used to define, render, store, or route firmware configuration.
Why it matters
- Explains how BIOS Setup UI is defined and connected to variables.
- Helps debug missing, disabled, or incorrectly saved setup options.
- Connects VFR/IFR/HII concepts with real setup behavior.
Practical example
Example: if a setup item does not appear, check the VFR/IFR condition first: SuppressIf may hide it completely, while GrayOutIf only disables it.
Quick checklist
- Does the FormSet/Form/Question exist in the generated IFR?
- Is the VarStore or variable mapping correct?
- Is the item hidden by SuppressIf or disabled by GrayOutIf?
Quick takeaway
GrayOutIf is easier to understand when you separate UI description, variable storage, and driver-side callback logic.
Related notes
Public references
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