Dell POWEREDGE R720XD - Manual (Page 8)

Item How is this memory write
protected? How is the memory cleared?
Planer
PCH Internal CMOS RAM N/A – BIOS only control 1) Set NVRAM_CLR jumper to clear BIOS
configuration settings at boot and reboot system;
2) AC power off system, remove coin cell battery
for 30 seconds, replace battery and power back
on; 3) restore default configuration in F2 system
setup menu.
BIOS SPI Flash Software write protected Not possible with any utilities or applications and
system is not functional if corrupted/removed.
iDRAC SPI Flash Embedded iDRAC
subsystem firmware
actively controls sub area
based write protection as
needed. Not completely user clearable; however, user
data, lifecycle log and archive, SEL, fw image
repository can be cleared via Delete Configuration
and Retire System, accessible in Lifecycle
Controller interface
BMC EMMC Embedded FW write
protected Not completely user clearable; however, user
data, lifecycle log and archive, SEL, fw image
repository can be cleared via Delete Configuration
and Retire System, accessible in Lifecycle
Controller interface
CPU Vcore and VSA
Regulators There are passwords for
different sections of the
register space Not user clearable
System CPLD RAM Not accessible Not accessible
System Memory OS Control Reboot or power down system
Internal USB Key No write protect Can be cleared in system OS
Trusted Platform Module
(TPM) SW write protected F2 Setup option
Power Supplies
PSU FW Protected by the
embedded microcontroller.
Special keys are used by
special vendor provided
utilities to unlock the ROM
with various CRC checks
during load. Not clearable
8x2.5" Backplane
SEP internal flash Program write protect bit Not user clearable