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
Memory VDDQ, CPU Vcore
and VSA Regulators
OTP (one time
programmable)
No
Operational parameters
SPI FLASH
SPI Flash EEPROM
Yes
Firmware
4 x 3.5"; 8 x 2.5" SAS/SATA front Backplane
SEP internal flash
Integrated
Flash+EEPROM
No
Firmware + FRU
Backplane External FRU
I2C EEPROM
No
FRU
H345/H745/H755/H755N fPERC
H345/H745/H755/H840 Adapter PERC
NVSRAM
NVSRAM
No
Configuration data
Secondary MCU
Non-volatile
1
U315
128KB
DCDC MCU
Non-volatile
1
U301
32KB
Liteon PSU
Primary MCU
Non-volatile
1
IC050
64K
Secondary MCU
Non-volatile
1
IC900
128K
Right Riser (R1, R2C)
MCU
Non-volatile
1
U1
8kB