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)
Planar
PCH Internal CMOS RAM
Battery-backed CMOS RAM
No
Real-time clock and
BIOS configuration
settings
BIOS Password
Battery-backed CMOS RAM
Yes
Password to change
BIOS settings
BIOS SPI Flash
SPI Flash
No
Boot code, system
configuration
information, UEFI
environment, Flash
Descriptor, 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,
iDRAC EMMC
eMMC NAND Flash
No
Operational iDRAC
FW, Lifecycle
Controller (LC) USC
partition, LC service
diags, LC OS drivers,
USC firmware
CPU
Cache + registers
Yes
Processor cache +
registers
CPU VCORE regulators
ROM
No
Operational
parameters
Memory regulators
ROM
No
Operational
parameters
Embedded Network
EEPROM
EEPROM
No
LOM network settings
Embedded Network Flash
Flash
No
onboard LOM FW
System CPLD RAM
RAM
No
Not utilized
SEP for 1.8” SSD Backplane
Integrated Flash + EEPROM
No
BP Firmware + FRU
IDRAC
Cache + registers
No
Processor cache +
registers
iDRAC DDR Memory
DRAM
No
iDRAC local memory