Reference Guide

Item
Purpose? (e.g. boot code)
How is data input to this memory?
Planer
PCH Internal CMOS RAM
Real-time clock and BIOS
configuration settings
BIOS
BIOS Password Password to change BIOS settings Keyboard
BIOS SPI Flash
Boot code, system configuration
information, UEFI environment, Flash
descriptor, ME
SPI interface via iDRAC
iDRAC SPI Flash
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,
SPI interface via iDRAC
BMC EMMC
Operational iDRAC FW, Lifecycle
Controller (LC) USC partition, LC
service diags, LC OS drivers, USC
firmware
NAND Flash interface via iDRAC
System CPLD RAM Not utilized Not utilized
System Memory System OS RAM System OS
Internal USB Key General purpose USB key drive
USB interface via PCH. Accessed via
system OS
Trusted Platform Module
(TPM, TPM 2.0 only)
Storage of encryption keys Using TPM Enabled operating systems
CPU Processor cache + registers
Various
iDRAC DDR
iDRAC local memory
iDRAC Firmware
iDRAC
Processor cache + registers
iDRAC Firmware
Power Supplies
PSU FW
Power Supply operation, power
management data and fault behaviors
Different vendors have different utilities
and tools to load the data to memory. It
can also be loaded by Dell Update
Package from LC or OS (Windows and
Linux)
12x3.5" Backplane
NVSRAM memory
FW config data
Common Flash memory Interface (CFI)