HP EliteBook 840 G9 Maintenance And Service Manual page 116

Table 11-1 Troubleshooting steps for nonvolatile memory usage (continued)
Nonvolatile
memory type
DIMM Serial
Presence Detect
(SPD)
configuration
data
System BIOS
Intel
Management
Engine Firmware
(present only in
select Elite or Z
models. For
more
information, go
to
http://www.hp.com/support. Select
Identify your
product for
manuals and
specific product
information, and
then follow the
on-screen
instructions.)
Bluetooth flash
(select products
only)
110 Chapter 11 Statement of memory volatility
Amount (Size) Does this
memory
store
customer
data?
256 bytes per No
memory
module, 128
bytes
programmable
(not customer
accessible)
9 MB Yes
1.5 MB or 7 Yes
MB
2 megabits No
Does this What is the
memory purpose of
retain data this memory?
when
power is
removed?
Yes Stores
memory
module
information.
Yes Stores system
BIOS code and
computer
configuration
data.
Yes Stores
Management
Engine Code,
Settings,
Provisioning
Data and iAMT
third-party
data store.
Yes Stores
Bluetooth
configuration
and firmware.
How is data entered into How is this memory
this memory? write-protected?
DIMM SPD is programmed Data cannot be written
by the memory vendor. to this memory
when the module is
installed in a computer.
The specific write-
protection method
varies by memory
vendor.
System BIOS code is NOTE:
programmed at the this ROM in an
factory. Code is updated inappropriate manner
when the system BIOS can render the
is updated. Configuration computer
data and settings are nonfunctional.
entered using the
A utility must be
Computer Setup (BIOS) or
used for writing
a custom utility.
data to this memory
and is available on
the HP website; go
to
support. Select Find
your product, and then
follow the on-screen
instructions.
Management Engine Code The Intel chipset is
is programmed at the configured to enforce
factory. Code is updated hardware protection to
via Intel secure firmware block all direct read-
update utility. Unique write access to this
Provisioning Data can be area. An Intel utility
entered at the factory must be used for
or by an administrator updating the firmware.
using the Management Only firmware updates
Engine (MEBx) setup digitally signed by Intel
utility. The third-party data can be applied using
store contents can be this utility.
populated by a remote
management console or
local applications that
have been registered by
an administrator to have
access to the space.
Bluetooth flash is A utility must be used
programmed at the for writing data to
factory. Tools for writing this memory and is
data to this memory are made available through
not publicly available but newer versions of
can be obtained from the the driver whenever
silicon vendor. the flash requires an
upgrade.
Writing data to
http://www.hp.com/