Dell PowerEdge R420 User Manual
Page 2
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)
Planer
PCH Internal CMOS RAM
Battery-backed CMOS
RAM
No
Real-time clock and BIOS
configuration settings
BIOS SPI Flash
SPI Flash
YES
Boot code, system
configuration information, UEFI
environment, Flash Disceptor,
ME
iDRAC SPI Flash
SPI Flash
No
iDRAC Uboot (bootloader),
server managent 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 and VSA
Regulators
OTP(one time
programmable)
No Operational parameters
System CPLD RAM
RAM
No
Not utilized
System Memory
RAM
Yes
System OS RAM
Power Supplies
PSU FW
Embedded
microcontroller flash
No Power
Supply
operation,
power management data and
fault behaviors
4x3.5" Backplane
SEP internal flash
Integrated
Flash+EEPROM
No
Firmware + FRU
8x2.5" Backplane
SEP internal flash
Integrated
Flash+EEPROM
No
Firmware + FRU