macOS kernel return 0xE0008001 (kIOConfigNoEntry): meaning

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The requested entry was not found in the FireWire Configuration ROM.

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kIOUSBUnknownPipeErr	kIOFireWirePending

kIOConfigNoEntry

A valid lookup can still have no matching entry

kIOConfigNoEntry is the FireWire-family status for a Configuration ROM lookup that found no requested entry. This differs from kIOFireWireConfigROMInvalid: here the operation can reach the lookup stage, but the key, directory, unit, or other requested item is absent from the ROM data visible for the node.

Configuration ROM content identifies device and unit information on an IEEE 1394 bus. A bus reset can change node identity and causes clients to reconsider the current bus generation, so stale ROM pointers or cached directory positions should not be reused as proof that an item must still exist.

Capture the lookup context

Keep the node GUID, bus generation, raw ROM image or its digest, and the exact key/directory/entry requested.
Distinguish a missing entry from an invalid ROM parse before changing cable or power hardware.
Refresh device information after reset or reconnect rather than relying on a prior node ID or unit directory offset.
Do not substitute a guessed ROM entry; device-class or unit binding must be based on the descriptors actually present.

References

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