Dell POWEREDGE R720XD - Manual (Page 5)

Item Type (e.g. Flash PROM, EEPROM) Can user programs or operating
system write data to it during normal
operation?
ONFI Backup Flash ONFI Backup Flash No
SDRAM SDRAM No
H310, H310M PERCs
NVSRAM NVSRAM No
FRU FRU No
1-Wire EEPROM 1-Wire EEPROM No
SBR SBR No
Flash Flash No
PCIe SSD Extension Card
Switch Configuration
EEPROM SPI Flash EEPROM No (requires specialized SW)
IDSDM
SPI Flash SPI Flash No
MCU Embedded Flash FW can be updated via Linux and DOS
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 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
CPU Vcore and VSA
Regulators Operational parameters Once values are loaded into register
space a command writes to NVMEM.
System CPLD RAM Not utilized Not utilized