Reference Guide

Primary BIOS SPI
Flash
Non-
Volatile
1
U_PRIM_SPI_
BIOS (U4042)
32MB
SPI Flash
No
Boot code
SPI interface
via PCH
Software write
protected
Not possible with any
utilities or applications and
system is not functional if
corrupted/removed.
CPU Vcore
Regulators
Non-
Volatile
2
PAAU1, PBAU1
16 KB
ROM
No
Operational
parameters
Programmed
at factory via
I2C
No write protect
Not user clearable
Vmem
Regulators
Non-
Volatile
2
PAEU1,
PBEU1
16 KB
ROM
No
Operational
parameters
Programmed
at factory via
I2C
no write
protect
Not user clearable
System CPLD
RAM
Volatile
1
U_CPL
D1
92Kb
RAM
No
Not utilized
Not utilized
Not
accessible
Not accessible
System CPLD
FLASH
Non-
Volatile
1
U_CPL
D1
256Kb
FLASH
No
Power on
System
Firmware
Firmware
update
BIOS
Security
Protocols
Not user clearable
System
Memory:
RDIMM and
LRDIMM
Volatile
Up to 12 per
CPU
CPU<2:
1>_CH<
5:0>_D
<1:0>
Up to 32GB
per RDIMM
UP to 128GB
Per LRDIMM
DRAM
Yes
System OS
RAM
System OS
OS Control
Reboot or power down
system