Reference Guide

Dell - Internal Use - Confidential
Item
How is data input to this
memory?
How is this memory write
protected?
How is the memory
cleared?
functional if corrupted or
removed.
BIOS Data SPI Flash
SPI interface via PCH
Software write protected
Not possible with any
utilities or applications
and the system is not
functional if BIOS SPI is
corrupted or removed.
iDRAC SPI Flash
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
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.
Memory VDDQ, CPU Vcore
and VSA Regulators
Once values are loaded
into register space a cmd
writes to nvm.
There are passwords for
different sections of the
register space
The user cannot clear
memory.
System CPLD RAM
Not utilized
Not accessible
Not accessible
System Memory
System OS
OS Control
Reboot or power down
system
System Memory-BPS
System OS
OS Control
OS Control/System BIOS
System Memory-NVDIMM
System OS
OS Control
OS Control/System BIOS
Internal USB Key
USB interface via PCH.
Accessed via system OS
No write protected
Can be cleared in the
system OS
Trusted Platform Module
(TPM, TPM 2.0 only)
Using TPM Enabled
operating systems
SW write protected
F2 Setup option
2 x 2.5" Universal SAS/SATA/NVMe Rear Backplane
4 x 3.5"; 8 x 2.5" SAS/SATA; 10x2.5" Universal SAS/SATA/NVMe front Backplane
SEP internal flash
I2C interface via iDRAC
Program write protect bit
The user cannot clear
memory.
Backplane External FRU
Programmed at ICT during
production.
No write protected
The user cannot clear
memory.
H345/H745/H755/H755N fPERC (Internal Controller) and H840 Adapter PERC (External Controller)
NVSRAM
ROC writes configuration
data to NVSRAM
no write protected. Not
visible to Host Processor
User cannot clear the
memory.
FRU
Programmed at ICT during
production.
no write protected
User cannot clear the
memory.