Reference Guide

Internal Use - Confidential
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
CPU Internal CMOS RAM
Battery-backed CMOS RAM
No
Real-time clock and
BIOS configuration
settings
BIOS SPI Flash
SPI Flash
Yes
Boot code, system
configuration
information, UEFI
environment, Flash
Disceptor, ME
iDRAC SPI Flash
SPI Flash
No
iDRAC Uboot
(bootloader), server
managent persistent
store (i.e. IDRAC MAC
Address, iDRAC boot
variables), lifecycle log
cache, virtual planar
FRU and EPPID, rac log,
System Event Log,
BMC EMMC
eMMC NAND Flash
YES
Operational iDRAC FW,
Lifecycle Controller
(LC) USC partition, LC
service diags, LC OS
drivers, USC firmware
Memory VDDQ, CPU Vcore
and VSA Regulators
OTP(one time programmable)
No
Operational
parameters
System CPLD RAM
RAM
No
Not utilized
System Memory
RAM
Yes
System OS RAM
Power Supplies
PSU FW
Embedded microcontroller flash
No
Power Supply
operation, power
management data and
fault behaviors