AMI FireWire GUID (Type 139)

Source: reverse engineered from the dumps of the data corpus.

Keeps the data holding the GUID of the IEEE 1394 (FireWire) controller of the board, under the name V1394GUID. The data corpus holds a single structure of the kind, on ASUS M5A97 PRO, so the layout of the data is not established: it begins like the bus information block of the configuration ROM of IEEE 1394, with the lengths of the block and of its CRC, 04 04, followed by the CRC and the options of the bus, and the OUI of VIA, 00 40 63, is found further on.

The structure is told by its signature at offset 0x04 and by its length. The data identifies the board, and is replaced when the table is anonymized.

Table 1. AMI FireWire GUID structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`139`	AMI FireWire GUID indicator
`0x01`	2.0+	Length	`BYTE`	`0x36`	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Signature	8 BYTEs	`FE DC BA 98 76 54 32 10`
`0x0C`	2.0+	Data	40 BYTEs	Varies	Data holding the GUID of the controller
`0x34`	2.0+	Unknown	`BYTE`	`0`	Meaning not established
`0x35`	2.0+	Name	`BYTE`	`STRING`	Name of the data, `V1394GUID`