What is ACPI Namespace?
Quick note explaining ACPI Namespace for BIOS/UEFI and embedded firmware readers.
What is ACPI Namespace?
The ACPI namespace is the object tree built by the OS from ACPI tables.
Why it matters
- Describes how firmware exposes hardware behavior to the OS.
- Helps connect schematic-level signals with OS-visible devices.
- Useful for debugging boot, power, and device-enumeration issues.
Practical example
Example: when a device is visible in firmware but not in the OS, compare ACPI namespace output, OS logs, and the resources returned by _CRS.
Quick checklist
- Which phase is the last confirmed point in the log?
- Is there enough context around the failure?
- Can UEFI Shell output confirm the same state?
Quick takeaway
ACPI Namespace is the contract between firmware description and OS interpretation.
Related notes
- ACPI Table Types: key points
- What is AML?
- What is ACPI Method?
- What is USB Initialization in DXE?
- What is SMBIOS Type 19–20?
Public references
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Nội dung liên quan
Một số bài viết, ghi chú hoặc project có liên quan đến nội dung bạn vừa đọc.
What is ACPI Method?
Quick note explaining ACPI Method for BIOS/UEFI and embedded firmware readers.
ACPI Table Types: key points
Quick note explaining ACPI Table Types for BIOS/UEFI and embedded firmware readers.
What is Power State S0–S5?
Quick note explaining Power State S0–S5 for BIOS/UEFI and embedded firmware readers.
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