Reference Guide

Internal Use - Confidential
Item
Non-
Volatile or
Volatile
Quantity
Reference
Designator
Size of
memory
Type of
memory
(e.g. Flash
PROM,
EEPROM)
Can user programs
or operating
system write data
to it during normal
operation?
What is the
Purpose?
(e.g. boot
code)
How is data
written to
this
memory?
How is
memory write
protected?
How is memory
cleared?
Planar
BIOS Password
(part of PCH
internal CMOS
RAM)
Non-Volatile
1
U_PCH
16 bytes (out
of 256 bytes
used for PCH
Internal
CMOS RAM)
Battery-
backed
CMOS RAM
Yes
Password to
change BIOS
settings
Keyboard
N/A – BIOS only
control
1) Place shunt on
J_PSWD_NVRAM
jumper pins 2 and 4.
2) AC power off is
required after placing the
shunt.
3) AC power on with the
shunt in place and then
can be removed
Primary BIOS
SPI Flash
Non-Volatile
1
U_PRIM_SPI
_BIOS
32MB
SPI Flash
No
Boot code
SPI interface
via PCH
Software write
protected
Not possible with any
utilities or applications
and system is not
functional if
corrupted/removed.
iDRAC SPI
Flash
Non-Volatile
1
U_IDRAC_SP
I
4 MB
SPI Flash
No
iDRAC Uboot
(bootloader)
SPI interface
via iDRAC
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
Non-Volatile
1
U_eMMC
4GB
eMMC
NAND Flash
No
Operational
iDRAC FW,
Lifecycle
Controller (LC)
USC partition,
LC service
diags, LC OS
drivers, USC
firmware
NAND Flash
interface via
iDRAC
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