What is AML?
Quick note explaining AML for BIOS/UEFI and embedded firmware readers.
What is AML?
AML (ACPI Machine Language) is the bytecode form of ACPI logic executed by the OS ACPI interpreter.
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
AML is the contract between firmware description and OS interpretation.
Related notes
- ACPI Table Types: key points
- What is ACPI Namespace?
- What is ACPI Method?
- How are DSDT vs SSDT different?
- What is USB Initialization in DXE?
Public references
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Một số bài viết, ghi chú hoặc project có liên quan đến nội dung bạn vừa đọc.
How are DSDT vs SSDT different?
Quick note explaining DSDT vs SSDT 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 ACPI Method?
Quick note explaining ACPI Method for BIOS/UEFI and embedded firmware readers.
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