HP EliteBook 840 G2 Notebook PC Maintenance And Service Manual page 131

Non Volatile Amount
Memory Type (Size)
Controller (NIC) 64 Kbytes
EEPROM (not customer
accessible)
Keyboard ROM 64 Kbytes
(not customer
accessible)
DIMM Serial 256 Bytes per
Presence Detect memory
(SPD) module, 128
configuration data Bytes
programmabl
e (not
customer
accessible)
System BIOS 4 to 5 MBytes
Intel Management 1.5 or 5MByte
Engine Firmware
(present only in
specific 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.)
ENWW
Does this Does this
memory memory
store retain data
customer when power
data? is removed?
No Yes
No Yes
No Yes
Yes Yes
Yes Yes
What is How is data input into this
the purpose of memory?
this memory?
Store NIC Using a utility from the NIC
configuration vendor that can be run from
and NIC DOS.
firmware.
Stores firmware Programmed at the factory.
code (keyboard, Code is updated when
mouse, & the system BIOS is updated.
battery
management).
Stores memory Programmed by the memory
module vendor.
information.
Store system System BIOS code is
BIOS code and programmed at the factory.
PC Code is updated when
configuration the system BIOS is updated.
data. Configuration data and
settings are input using
the F10 setup utility or a
custom utility.
Stores Management Engine Code is
Management programmed at the factory.
Engine Code, Code is updated via Intel
Settings, secure firmware update
Provisioning utility. Unique Provisioning
Data and iAMT Data can be entered at
third party data the factory or by an
store. 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.
How is this memory write
protected?
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 non-
functional.
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.
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 non-
functional.
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 Intel
can be applied using this
utility.
Non-volatile memory usage 121