Dell PowerEdge R820 - Manual (Page 5)

5
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
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) Storage of encryption keys Using TPM Enabled operating systems
PEM FRU FRU I2C interface via iDRAC
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)
8x2.5" Backplane
SEP internal flash Firmware
16x2.5" Backplane
Flash memory Firmware Common Flash memory Interface (CFI)
Expander FRU image FRU I2C interface via iDRAC