Reference Guide

Primary
BIOS SPI
Flash
Non-
Volatile
1
U_SPI_BIO
S
32 MB
SPI Flash
No
Boot code
SPI interface via
PCH
Software write
protected
Not possible with any utilities or
applications and system is not
functional if corrupted or removed
iDRAC
SPI Flash
Non-
Volatile
1
U_UBOOT
4 MB
SPI Flash
No
iDRAC Uboot
(bootloader)
SPI interface via
iDRAC
Embedded iDRAC
subsystem firmware
actively controls sub
area based write
protection as
needed.
The user cannot clear memory
completely. However, user data,
lifecycle log and archive, SEL, and
fw image repository can be cleared
using Delete Configuration and
Retire System, which can be
accessed through the Lifecycle
Controller interface
BMC
EMMC
Non-
Volatile
1
U_EMMC
4 MB
eMMC
NAND
Flash
No
Operational
iDRAC FW,
Lifecycle
Controller (LC)
USC partition,
LC service
diags, LC OS
drivers, USC
firmware
NAND Flash
interface via
iDRAC
Embedded FW write
protected
The user cannot clear memory
completely. However, user data,
lifecycle log and archive, SEL, and
fw image repository can be cleared
using Delete Configuration and
Retire System, which can be
accessed through the Lifecycle
Controller interface
CPU
Vcore
Regulator
s
Non-
Volatile
2
EU_CPU1_
VR
EU_CPU2_
VR
16 KB
ROM
No
Operational
parameters
Programmed at
factory via I2C
No write protect
The user cannot clear memory
completely
Vmem
Regulator
s
Non-
Volatile
2
EU_CPU1_
VDDQ_VR
EU_CPU2_
VDDQ_VR
16 KB
ROM
No
Operational
parameters
Programmed at
factory via I2C
No write protect
The user cannot clear memory
completely