What is FADT?
Quick note explaining FADT for BIOS/UEFI and embedded firmware readers.
What is FADT?
FADT (Fixed ACPI Description Table) is a central ACPI table that provides fixed platform and power-management information, including references to DSDT and FACS.
Why it matters
- Helps the OS understand platform devices or resources.
- Connects firmware description with OS driver behavior.
- Useful when debugging ACPI namespace, resource, or table issues.
Practical example
Example: if the OS does not bind a driver to an ACPI device, check _STA, _HID/_CID, and _CRS in that order.
Quick checklist
- Does the object/table appear in the ACPI namespace or OS table dump?
- Do _STA, _HID/_CID, and _CRS report consistent information?
- Do OS logs show ACPI errors or resource conflicts?
Quick takeaway
FADT is the contract between firmware description and OS interpretation.
Related notes
- ACPI Table Types: key points
- What is ACPI Namespace?
- What is AML?
- What is ACPI Method?
- What is XSDT?
Public references
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