HP/HPE 64-bit CRU Information (Type 212)

Source: dmidecode, dmioem.c, the hpwdt watchdog timer driver of Linux, and the dumps of the data corpus.

Tells where the 64-bit entry point of the Compaq ROM Utility (CRU) services of the firmware is, which the watchdog timer driver calls. The structure is known up to Gen8. Servers of AMD carry a record of another signature too, $SHF, whose meaning is not known: dmidecode and the watchdog timer driver read the rest of the fields of the records of the $CRU signature only.

Table 1. HP/HPE 64-bit CRU Information structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`212`	HP/HPE 64-bit CRU Information indicator
`0x01`	2.0+	Length	`BYTE`	`0x18`	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Signature	4 BYTEs	`$CRU`
`0x08`	2.0+	Physical Address	`QWORD`	Varies	Physical address of the service area
`0x10`	2.0+	Length	`DWORD`	`NUMBER`	Length of the service area
`0x14`	2.0+	Entry Point Offset	`DWORD`	`NUMBER`	Offset of the entry point within the service area