HP/HPE Device Correlation Record (Type 203)

Source: dmidecode, dmioem.c. No dumps of the data corpus hold the structure.

Correlates a device with the system slot (type 9) or the onboard device (type 41) it is found at, and with the UEFI boot entries naming it. The structure is decoded from Gen9 onwards. It has grown over the generations, and the shortest structures end after the device name, at 0x1F. The PCI location, from 0x24 on, is present in the structures of 40 bytes or more.

Table 1. HP/HPE Device Correlation Record structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`203`	HP/HPE Device Correlation Record indicator
`0x01`	2.0+	Length	`BYTE`	Varies	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Device Handle	`WORD`	`HANDLE`	Handle of the system slot (type 9) or onboard device (type 41) structure, `0xFFFE` if not applicable
`0x06`	2.0+	SMBus Handle	`WORD`	`HANDLE`	Handle of the SMBus segment record (type 228), `0xFFFE` if not applicable
`0x08`	2.0+	PCI Vendor ID	`WORD`	`NUMBER`	`0xFFFF` if the device is not present
`0x0A`	2.0+	PCI Device ID	`WORD`	`NUMBER`	`0xFFFF` if the device is not present
`0x0C`	2.0+	PCI Subsystem Vendor ID	`WORD`	`NUMBER`	`0xFFFF` if the device is not present
`0x0E`	2.0+	PCI Subsystem ID	`WORD`	`NUMBER`	`0xFFFF` if the device is not present
`0x10`	2.0+	PCI Class Code	`BYTE`	`NUMBER`	`0xFF` if the device is not present
`0x11`	2.0+	PCI Subclass Code	`BYTE`	`NUMBER`	`0xFF` if the device is not present
`0x12`	2.0+	Parent Handle	`WORD`	`HANDLE`	Handle of the parent device, `0xFFFE` if not applicable. The structure it refers to is not documented, and is presumably the device correlation record of the parent device
`0x14`	2.0+	Flags	`WORD`	`BITFIELD`	Bit 0: peer bifurcated device, bit 1: upstream device
`0x16`	2.0+	Device Type	`BYTE`	`ENUM`	UEFI only, see below
`0x17`	2.0+	Device Location	`BYTE`	`ENUM`	See below
`0x18`	2.0+	Device Instance	`BYTE`	`NUMBER`
`0x19`	2.0+	Device Sub-Instance	`BYTE`	`NUMBER`	Port of a NIC, or bay of an NVMe drive
`0x1A`	2.0+	Bay	`BYTE`	`NUMBER`	`0` if unknown, `0xFF` if not shown
`0x1B`	2.0+	Enclosure	`BYTE`	`NUMBER`	`0` if unknown, `0xFF` if not shown
`0x1C`	2.0+	UEFI Device Path	`BYTE`	`STRING`
`0x1D`	2.0+	UEFI Device Structured Name	`BYTE`	`STRING`
`0x1E`	2.0+	UEFI Device Name	`BYTE`	`STRING`
`0x1F`	2.0+	UEFI Location	`BYTE`	`STRING`
`0x20`	2.0+	Physical Slot Handle	`WORD`	`HANDLE`	Handle of the system slot structure (type 9) of the real physical slot, valid if bit 0 of the flags is set
`0x22`	2.0+	Part Number	`BYTE`	`STRING`	Part number of the PCI device
`0x23`	2.0+	Serial Number	`BYTE`	`STRING`	Serial number of the PCI device
`0x24`	2.0+	Segment Group	`WORD`	`NUMBER`	PCI segment group, zero for a single group topology
`0x26`	2.0+	Bus	`BYTE`	`NUMBER`	PCI bus
`0x27`	2.0+	Device and Function	`BYTE`	`NUMBER`	PCI device and function, `(device << 3) \| function`

Table 2. Device type
Value	Meaning
`0x00`	Unknown
`0x03`	Flexible LOM
`0x04`	Embedded LOM
`0x05`	NIC in a slot
`0x06`	Storage controller
`0x07`	Smart Array storage controller
`0x08`	USB hard disk
`0x09`	Other PCI device
`0x0A`	RAM disk
`0x0B`	Firmware volume
`0x0C`	UEFI shell
`0x0D`	Generic UEFI USB boot entry
`0x0E`	Dynamic Smart Array controller
`0x0F`	File
`0x10`	NVMe hard drive
`0x11`	NVDIMM
`0x12`	Embedded GPU

Table 3. Device location
Value	Meaning
`0x00`	Unknown
`0x01`	Embedded
`0x02`	iLO virtual media
`0x03`	Front USB port
`0x04`	Rear USB port
`0x05`	Internal USB
`0x06`	Internal SD card
`0x07`	Internal virtual USB (embedded NAND)
`0x08`	Embedded SATA port
`0x09`	Embedded Smart Array
`0x0A`	PCI slot
`0x0B`	RAM memory
`0x0C`	USB
`0x0D`	Dynamic Smart Array controller
`0x0E`	URL
`0x0F`	NVMe drive bay
`0x10`	NVDIMM processor
`0x11`	NVDIMM board
`0x12`	NVMe riser
`0x13`	NVDIMM namespace
`0x14`	VROC SATA
`0x15`	VROC NVMe