What is RSDP?
Quick note explaining RSDP for BIOS/UEFI and embedded firmware readers.
What is RSDP?
RSDP (Root System Description Pointer) is the entry point that lets the OS locate ACPI tables through RSDT or XSDT.
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
RSDP 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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