Lenovo Mobile PC OEM Data (Type 135)

Source: Compal hel81 Service Manual Software Specification, dmidecode, dmioem.c, and the dumps of the data corpus.

Holds one OEM structure of a Lenovo laptop, told by its number and revision. The service manuals name the type "Bulk for Lenovo Mobile PC Unique OEM Data". OEM structures 0, 1, 2 and 4 are found in the data corpus too, and only structures 2 and 3 are decoded.

Table 1. Lenovo Mobile PC OEM Data structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`135`	Lenovo Mobile PC OEM Data indicator
`0x01`	2.0+	Length	`BYTE`	Varies	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Signature	2 BYTEs	`TP`
`0x06`	2.0+	OEM Structure Offset	`BYTE`	`0x07`	Offset of the OEM structure number
`0x07`	2.0+	OEM Structure Number	`BYTE`	`NUMBER`
`0x08`	2.0+	OEM Structure Revision	`BYTE`	`NUMBER`
`0x09`	2.0+	Data	Varies	Varies	Data of the OEM structure, see below

Table 2. Device presence detection (OEM structure 3, revision 1)
Offset	Name	Length	Description
`0x09`	Device Presence	`BYTE`	Bit 0: a fingerprint reader is present

Table 3. Bay I/O (OEM structure 2)
Offset	Name	Length	Description
`0x08`	Signature	8 BYTEs	`BAY I/O `, in place of the revision
`0x10`	Version	`BYTE`	`1` to `4` in the data corpus
`0x11`	Data	Varies	Layout not known