Dell PowerEdge R420 - 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