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kIOFireWireConfigROMInvalid
The device description cannot be trusted yet
kIOFireWireConfigROMInvalid identifies a Configuration ROM validation failure in Apple's FireWire family. The code is more specific than a missing directory entry: it means the ROM data needed for discovery or binding could not be used as a valid description of the node for that operation.
Configuration ROM is tied to a bus node and can be observed across resets and topology changes. Diagnostic work should preserve the exact ROM bytes, length, generation, and node identity. A later reset can change what is readable, but it does not prove that an earlier invalid image was harmless or that it described the same state.
Validate the acquisition path
- Save the raw ROM image, reported length, node GUID, controller, and bus generation before attempting recovery.
- Check whether the failure followed a reset, device power transition, cable change, or partial enumeration.
- Distinguish ROM validation from a lookup failure; the latter is represented by
kIOConfigNoEntry. - Do not bind a driver or parser to partially trusted ROM data merely because a familiar vendor or model string appears elsewhere.
References
- Apple: IOFireWireFamilyCommon.h
- Apple: IOFireWireDeviceInterface
- Linux kernel: FireWire driver interface guide
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