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Non-volatile memory usage
Non Volatile
Memory Type
Real Time Clock
(RTC) battery
backed-up
CMOS
configuration
memory (CMOS)
Controller (NIC)
EEPROM
Keyboard ROM
DIMM Serial
Presence
Detect (SPD)
configuration
data
System BIOS
Intel
Management
Engine
Firmware
(present only in
models ending
in a 'p' or 'w' or
with Intel
Centrino Pro
technology)
120 Chapter 14 Statement of Volatility
Amount
Does this
Does this
(Size)
memory
memory
store
retain data
customer
when power is
data?
removed?
256 Bytes
No
Yes
64 Kbytes
No
Yes
(not
customer
accessible)
64 Kbytes
No
Yes
(not
customer
accessible)
256 Bytes
No
Yes
per memory
module,
128 Bytes
programma
bl e (not
customer
accessible)
4 to 5
Yes
Yes
MBytes
1.5 or
Yes
Yes
5MByte
What is the
How is data input into
purpose of
this memory?
this memory?
Stores system
Using the F10 Setup utility
date and time
or changing the
and limited
Microsoft® Windows®
keyboard
date & time.
controller
data.
Store NIC
Using a utility from the
configuration
NIC vendor that can be run
and NIC
from DOS.
firmware.
Stores
Programmed at the
firmware code
factory. Code is updated
(keyboard,
when the system BIOS is
mouse, &
updated.
battery
management).
Stores
Programmed by the
memory
memory vendor.
module
information.
Store system
System BIOS code is
BIOS code and
programmed at the
PC
factory. Code is updated
configuration
when the system BIOS is
data.
updated. Configuration
data and settings are
input using the F10 setup
utility or a custom utility.
Stores
Management Engine Code
Management
is programmed at the
Engine Code,
factory. Code is updated
Settings,
via Intel secure firmware
Provisioning
update utility. Unique
Data and iAMT
Provisioning Data can be
third party
entered at the factory or
data store.
by an administrator using
the Management Engine
(MEBx) setup utility. The
How is this memory
write protected?
This memory is not
write-protected. HP
recommends
password protecting
the F10 Setup utility.
A utility is required to
write data to this
memory and is
available from NIC
vendor. Writing data
to this ROM in an
inappropriate manner
will render the NIC
nonfunctional.
A utility is required for
writing data to this
memory and is
available on the HP
website. Writing data
to this ROM in an
inappropriate manner
can render the PC
nonfunctional.
Data cannot be written
to this memory when
the module is installed
in a PC. The specific
write protection
method varies by
memory vendor.
A utility is required for
writing data to this
memory and is
available on the HP
website. Writing data
to this ROM in an
inappropriate manner
can render the PC
nonfunctional.
The Intel chipset is
configured to enforce
HW protection to block
all direct read/write
access to this area. An
Intel utility is required
for updating the
firmware. Only
firmware updates
digitally signed by
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