Dell POWEREDGE R520 - 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)
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,
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
8x3.5" Backplane
SEP internal flash Integrated Flash+EEPROM No Firmware + FRU
Item How is data input to this memory? How is this memory write protected?
Planer
PCH Internal CMOS RAM BIOS N/A – BIOS only control
BIOS SPI Flash SPI interface via iDRAC Software write protected
iDRAC SPI Flash SPI interface via iDRAC Embedded iDRAC subsystem firmware
actively controls sub area based write
protection as needed.
BMC EMMC NAND Flash interface via iDRAC Embedded FW write protected
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