HP EliteBook 745 G2 HP Notebook PC and EliteBook 755 G2 Notebook PC - Maintenance and Service Guide

Non Volatile
Memory Type
Amount (Size) Does this
memory
store
customer
data?
Does this
memory
retain data
when power
is removed?
What is the
purpose of this
memory?
How is data input into this
memory?
How is this memory
write protected?
Keyboard ROM 64 Kbytes (not
customer
accessible)
No Yes Stores rmware
code (keyboard,
mouse, &
battery
management).
Programmed at the factory.
Code is updated when the
system BIOS is updated.
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
non-functional.
DIMM Serial
Presence Detect
(SPD)
conguration data
256 Bytes per
memory
module, 128
Bytes
programmable
(not customer
accessible)
No Yes Stores memory
module
information.
Programmed by the memory
vendor.
Data cannot be written to
this memory when the
module is installed in a
PC. The specic write
protection method varies
by memory vendor.
System BIOS 4 to 5 MBytes Yes Yes Store system
BIOS code and
PC
conguration
data.
System BIOS code is
programmed at the factory.
Code is updated when the
system BIOS is updated.
Conguration data and
settings are input using the
F10 setup utility or a custom
utility.
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
non-functional.
Intel Management
Engine Firmware
(present only in
specic ZBook and
EliteBook models.
For more
information, go to
http://www.hp.com/
support, and
select your
country. Select
Drivers &
Downloads, and
then follow the
on-screen
instructions.)
1.5 or 5MByte Yes Yes Stores
Management
Engine Code,
Settings,
Provisioning
Data and iAMT
third party data
store.
Management Engine Code is
programmed at the factory.
Code is updated via Intel
secure rmware update
utility. Unique Provisioning
Data can be entered at the
factory or by an
administrator using the
Management Engine (MEBx)
setup utility. The third party
data store contents can
populated by a remote
management console or local
applications registered by an
administrator to have access
to the space.
The Intel chipset is
congured to enforce HW
protection to block all
direct read/write access
to this area. An Intel
utility is required for
updating the rmware.
Only rmware updates
digitally signed by Intel
can be applied using this
utility.
Bluetooth ash 2Mbit No Yes Stores
Bluetooth
conguration
and rmware.
Programmed at the factory.
Tools for writing data to this
memory are not publicly
available but can be obtained
from the silicon vendor.
A utility is required for
writing data to this
memory and is made
available through newer
versions of the driver if
the ash requires an
upgrade.
802.11 WLAN
EEPROM
4kb to 8kb No Yes Stores
conguration
and calibration
data.
Programmed at the factory.
Tools for writing data to this
memory are not made public.
A utility is required for
writing data to this
memory and is typically
not made available to the
public unless a rmware
upgrade is necessary to
address a unique issue.
138 Chapter 17 Statement of Volatility