Reference Guide

Dell - 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?
BIOS
Non-
1
U_PCH1
16 Bytes
Battery-
No
Password to
Keyboard
N/A – BIOS
1) Place shunt on
CN1001 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
Password
Volatile
(out of 256
backed
change BIOS
only control
(part of PCH
bytes used
CMOS
settings
internal CMOS
for PCH
RAM
RAM)
Internal
CMOS
RAM)
BIOS SPI
Non-
1
U_
BIOS_SPI1
32 MB
SPI Flash
No
Boot code
SPI interface
Software write-
You cannot remove
the memory with any
utilities or applications.
Note: When memory
is corrupted or
removed, System
becomes non-
functional
Flash
Volatile
via PCH
protected