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STATUS_ACPI_INVALID_ACCESS_SIZE
STATUS_ACPI_INVALID_ACCESS_SIZE is a bounds and transfer-size condition. An AML field access asks for a width or range that does not fit the field or operation-region definition used for that access. The target may exist and its address may translate correctly; the requested access itself is outside the declared extent.
This is more precise than a generic I/O error. The evidence needed to diagnose it is the field bit offset and length, region offset and length, selected access type, and the effective transfer width after AML evaluation.
The requested ACPI field transfer did not fit its declared bounds
- Capture the field declaration, access type, bit offset, bit length and containing operation-region limits.
- Check conditional or index-based calculations that can change the effective offset or width at runtime.
- Compare with
STATUS_ACPI_ADDRESS_NOT_MAPPED: mapping locates a target; access-size validation ensures the requested transfer fits it.
References
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