Reference Guide

Dell - 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)
Planer
PCH 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
BIOS Data ROM SPI Flash
SPI Flash
No
4MB Data SPI ROM storage
BIOS setting.
iDRAC SPI Flash
SPI Flash
No
iDRAC Uboot (boot loader),
server management persistent
store (i.e. iDRAC boot
variables), and virtual planar
FRU
BMC EMMC
eMMC NAND Flash
No
Operational iDRAC FW, Lifecycle
Controller (LC) USC partition, LC
service diags, LC OS drivers, USC
firmware, IDRAC MAC Address,
and EPPID, rac log, System
Event Log, lifecycle log cache
iDRAC DDR4
RAM
Yes
iDRAC RAM
System CPLD RAM
RAM
No
Not utilized
System Memory
RAM
Yes
System OS RAM
System Memory-BPS
BPS
Yes
System OS RAM
App direct
System Memory-NVDIMM
NVDIMM
Yes
System OS RAM
App direct
Memory VDDQ, CPU Vcore
and VSA Regulators
OTP (one time
programmable)
No
Operational parameters
2 x 2.5" Universal SAS/SATA/NVMe rear Backplane
4 x 3.5"; 8 x 2.5" SAS/SATA; 10 x 2.5" Universal SAS/SATA/NVMe front Backplane
SEP internal flash
Integrated
Flash+EEPROM
No
Firmware + FRU
Backplane External FRU
I2C EEPROM
No
FRU
H345/H745/H755/H755N fPERC (Internal controller)
NVSRAM
NVSRAM
No
Configuration data
FRU
EEPROM
No
Card manufacturing
information
SPD
EEPROM
No
Memory configuration data
NV Flash
SPI Flash
No
Card firmware
CPLD
Flash
No
Power sequencing and Cache
Offload
MCU
Non-volatile
1/1
U6
8kB