Reference Guide

Item
Non-Volatile
or Volatile
Quantity
Reference
Designator
Size
SBR
Non-volatile
1
U1020
8KB
Flash
Non-volatile
1
U3
16MB
LSI2008
EEPROM
Non-volatile
1
U5
8k bytes
FLASH
Non-volatile
1
U4
16M bytes
1G NIC MEZZ
SPI Flash
Non-volatile
1
U4000
1M bytes
EEPROM
Non-volatile
1
U11
32K bytes
10G NIC MEZZ
SPI Flash
Non-volatile
1
U4000
2M bytes
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, JobStore, iDRAC
Secure boot code,
BMC EMMC
eMMC NAND Flash
No
Operational iDRAC FW,
Lifecycle Controller (LC) USC
partition, LC service diags, LC
OS drivers, USC firmware
CPU Vcore Regulators
ROM
No
Operational parameters
System CPLD RAM
RAM
No
Not utilized
System Memory
DRAM
Yes
System OS RAM
CPU
Cache + registers
Yes
Processor cache + registers
iDRAC DDR
DRAM
No
iDRAC local memory
3