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
BIOS Password
(part of CPU internal CMOS
RAM)
Battery-backed CMOS
RAM
Yes
Password to change BIOS
settings
Primary BIOS SPI Flash SPI Flash No
Boot code
iDRAC SPI Flash SPI Flash No
iDRAC Uboot (bootloader)
BMC EMMC eMMC NAND Flash No
Operational iDRAC FW,
Lifecycle Controller (LC) USC
partition, LC service diags,
LC OS drivers, USC firmware
CPU VDDCR Regulators ROM No
Operational
parameters
CPU VSOC Regulators ROM No
Operational
parameters
CPU Vmem Regulators
ROM No
Operational
parameters
System CPLD RAM
FLASH No
Not utilized
System CPLD FLASH
RAM No
Power on System Firmware
System Memory: RDIMM and
LRDIMM
DRAM Yes
System OS RAM
Internal USB Key
Flash Yes
General purpose USB key
drive
CPU
Cache + registers Yes
Processor cache + registers
iDRAC DDR
DRAM No
iDRAC local memory
iDRAC
Cache + registers No
Processor cache + registers
Recovery BIOS SPI
SPI Flash No
Recovery image
10 x 2.5" Universal
SAS/SATA/NVMe
Backplane
SEP internal flash
Integrated
Flash+EEPROM
No
Firmware + FRU
Backplane FRU
I2C EEPROM No
FRU
H745 Adapter PERC
NVSRAM
NVSRAM No
Configuration data
FRU
EEPROM No
Card manufacturing
information
SPD
EEPROM No
Memory
configuration data
Flash
Flash No
Card firmware
Backup Flash
Backup Flash No
Holds cache data
during power loss