HP/HPE Reserved Memory Location (Type 229)

Source: dmidecode, dmioem.c, and the dumps of the data corpus.

Tells where the memory regions the firmware reserves at boot are, which it reports to the operating system as reserved, e.g. the one the storage controller and iLO exchange the temperatures of the drives in. Regions run to the end of the structure, which carries no number of them of its own, and a table may hold several structures.

Table 1. HP/HPE Reserved Memory Location structure
Offset	Version	Name	Length	Value	Description
`0x00`	2.0+	Type	`BYTE`	`229`	HP/HPE Reserved Memory Location indicator
`0x01`	2.0+	Length	`BYTE`	Varies	Length of the structure
`0x02`	2.0+	Handle	`WORD`	Varies
`0x04`	2.0+	Regions	16 BYTEs each	Varies	Regions, see below

Table 2. Region
Offset	Name	Length	Description
`0x00`	Signature	4 BYTEs	What the region is for, e.g. `$HDD`
`0x04`	Physical Address	`QWORD`
`0x0C`	Size	`DWORD`	Bits 0-30: size, bit 31: the size is in kilobytes rather than in bytes