Reference Guide

Item
Type (e.g. Flash PROM,
EEPROM)
Can user programs or
operating system write
data to it during normal
operation?
Purpose? (e.g. boot code)
Planer
PBG Internal CMOS NVRAM
Battery-backed CMOS
NVRAM
No
Real-time clock and BIOS
configuration settings
BIOS SPI Flash
SPI Flash
No
Boot code, system configuration
information, UEFI environment,
Flash Disceptor, ME
iDRAC SPI Flash
SPI Flash
No
iDRAC Uboot (bootloader), server
management persistent store (i.e.
IDRAC MAC Address, iDRAC boot
variables), lifecycle log cache,
virtual planar FRU and EPPID, rac
log, System Event Log, JobStore,
iDRAC Secure Boot Code,
IDRAC SDRAM
IDRAC SDRAM
No
Video memory written by IDRAC
memory interface.
BMC EMMC
eMMC NAND Flash
No
Operational iDRAC FW, Lifecycle
Controller USC partition, LC
service diag., LC OS drivers, USC
firmware
CPU Vcore and VSA
Regulators
OTP(one time
programmable)
No
Operational parameters
System CPLD
CPLD
No
Operational parameters and
system control.
TPM
EEPROM
No
Stores encryption keys for TPM
functionality
Power Supplies
PSU FW
Embedded microcontroller
flash
No
Power Supply operation, power
management data and fault
behaviors
24x2.5" SAS Backplane
BP FRU image
I2C EEPROM
No
FRU
16+8x2.5" PCIe SSD Backplane
SEP internal flash
Integrated Flash+EEPROM
No
Firmware + FRU
4x2.5" 12GB Backplane
SEP internal flash
Integrated Flash+EEPROM
No
Firmware + FRU