Reference Guide

Recovery
BIOS SPI
Non-
Volatile
1
U_REC_SP
I_BIOS
16 MB
SPI Flash
No
Recovery image
SPI interface via
iDRAC
No write protect
Cannot be cleared by the user
Processor
Expansion
Module
(PEM)
PEM FRU
image
Non-
Volatile
1
U_FRU
512 Bytes
I2C
EEPROM
No
FRU
I2C interface via
expander
Hardware strapping
Cannot be cleared by the user
CPU
Vcore
Regulator
s
Non-
Volatile
2
EU_CPU3_
VR
EU_CPU4_
VR
16 KB
ROM
No
Operational
parameters
Programmed at
factory via I2C
No write protect
Cannot be cleared by the user
Vmem
Regulator
s
Non-
Volatile
2
EU_CPU3_
VDDQ_VR
EU_CPU4_
VDDQ_VR
16 KB
ROM
No
Operational
parameters
Programmed at
factory via I2C
No write protect
Cannot be cleared by the user
CPU
PIROM
Non-
Volatile
1 or 2
CPU3 /
CPU4
256 Bytes
EEPROM
No
Processor info +
scratchpad
SMBus interface
to iDRAC
128 Bytes protected
by Intel/128 bytes
not protected
Cannot be cleared by the user
CPU
Volatile
1 or 2
CPU3 /
CPU4
Various
Cache +
registers
Yes
Processor cache
+ registers
Various
Various
Various
System
Memory:
RDIMM
and
LRDIMM
Volatile
Up to 12
per CPU
CPU<4:3>_
CH<3:0>_D
<2:0>
Up to 128
GB per
DIMM
DRAM
Yes
System OS RAM
System OS
OS Control
Reboot or power off the system
System
CPLD
RAM
Volatile
1
U_CPLD2
92 KB
RAM
No
Power on
System
Firmware
Firmware update
BIOS Security
Protocols
Vendor is Lattice and the
programming tool is called
Diamond
System
CPLD
FLASH
Non-
Volatile
1
U_CPLD2
256 KB
FLASH
No
Not utilized
Not utilized
Not accessible
Not accessible